Updated August 6, 2026: Commissioning procedures vary by heat pump type, refrigerant, control system, installation conditions and manufacturer. The installer should follow the current instructions for the exact equipment and document any tests that cannot be completed under the available weather conditions.
Heat pump commissioning is the process of configuring, testing, measuring and documenting a newly installed system. It should confirm that the indoor and outdoor equipment match the approved design, electrical components operate correctly, refrigerant piping is properly prepared, controls respond as intended and the system delivers suitable airflow or zone performance.
Commissioning is more than switching the heat pump on. A system can start while still having incorrect blower settings, excessive duct pressure, an inaccurate refrigerant charge, poor drainage, disabled supplementary heat, incorrect dual-fuel controls or an indoor unit that does not communicate properly.
Some performance checks depend on outdoor and indoor conditions. When the weather does not permit a valid manufacturer-approved test, the commissioning report should identify the limitation, record the available data and state whether follow-up verification is required.
What Should Be Checked After Heat Pump Installation?
A complete commissioning process should verify the installed system against:
- The approved design
- The manufacturer’s installation instructions
- The equipment specifications
- The electrical and mechanical scope
- The homeowner’s intended operating strategy
Core Commissioning Categories Include:
- Equipment identification and matching
- Physical installation
- Refrigerant piping and charge
- Electrical operation
- Controls and communication
- Heating and cooling operation
- Airflow and static pressure
- Supplementary heating
- Condensate and defrost drainage
- Homeowner education
- Written records
The Homeowner Should Receive Evidence
Useful commissioning evidence can include:
- Completed commissioning report
- Recorded model and serial numbers
- Airflow or static-pressure measurements where applicable
- Refrigerant charge documentation
- Control settings
- Permit and inspection records
- Operating instructions
- Warranty information
Heat Pump Startup vs Commissioning
| Startup | Commissioning |
|---|---|
| Confirms that equipment receives power | Confirms correct voltage, protection and operating current |
| Confirms that the system turns on | Confirms that heating, cooling, fans, controls and backup heat respond correctly |
| May observe air coming from a register or indoor head | Measures or verifies airflow against manufacturer requirements |
| May confirm that the compressor operates | Evaluates refrigerant charge through the manufacturer-approved method |
| May confirm that condensate appears | Tests drainage and overflow protection |
| May take only a few minutes | Requires systematic testing, adjustment and documentation |
A Running System Can Still Be Incorrectly Commissioned
Examples include:
- Wrong blower profile
- Incorrect thermostat equipment type
- Excessive duct static pressure
- Unverified refrigerant charge
- Electric heat kit not operating
- Furnace changeover configured incorrectly
- Condensate pump not connected to a safety switch
- One multi-zone indoor unit not communicating
Commissioning Should Compare Results With Requirements
A number has little value unless it is compared with:
- Manufacturer specification
- Equipment performance table
- Approved system design
- Applicable commissioning standard
Can Heat Pump Commissioning Be Completed in Any Weather?
Some checks can be completed during any season, while others require suitable operating conditions.
Checks Commonly Available in Most Conditions Include:
- Equipment identification
- Electrical verification
- Control configuration
- Indoor fan operation
- Drain testing
- Static-pressure measurement
- Communication and fault review
- Supplementary-heating testing
Weather-Sensitive Checks Can Include:
- Heating performance during warm outdoor weather
- Cooling performance during cold outdoor weather
- Refrigerant operating data
- Defrost operation
- Maximum-capacity verification
- Humidity-removal performance
Manufacturer Test Mode May Help
Some modern heat pumps provide a service or check-charge mode that forces specified operating conditions for testing.
The technician should use only the test procedure approved for the exact equipment.
Do Not Invent Valid Data
If outdoor conditions do not support a valid test, the report should state:
- Which test was limited
- What data was available
- Which manufacturer method was used
- Whether a return visit is recommended
A Follow-Up Visit Can Be Appropriate
Seasonal verification may be useful when:
- Cooling was installed during winter.
- Heating was installed during very warm weather.
- A persistent performance concern appears later.
- The manufacturer requires specific ambient conditions.
1. Verify the Installed Equipment
Commissioning begins by confirming that the installed components are the components that were designed and quoted.
Record:
- Outdoor-unit manufacturer
- Outdoor model and serial number
- Indoor model and serial number
- Every ductless indoor-unit model
- Furnace or air-handler model
- Electric heat-kit model and capacity
- Thermostat or controller model
- Refrigerant type
Confirm the Equipment Match
Verify that the indoor and outdoor components form an approved combination where applicable.
Check for Unapproved Substitutions
A substituted indoor or outdoor model can change:
- Heating capacity
- Cooling capacity
- Efficiency
- Electrical requirements
- Refrigerant
- Control compatibility
- Warranty
- Incentive eligibility
Verify Physical Condition
Check for:
- Shipping damage
- Bent cabinet panels
- Damaged coil fins
- Broken fan guards
- Missing covers
- Incomplete labels
Provide the Records to the Homeowner
The homeowner should not need to dismantle equipment several years later to discover what was installed.
2. Inspect Equipment Location and Workmanship
Correct equipment selection cannot compensate for a poor physical installation.
Outdoor-Unit Checks Include:
- Required intake and discharge clearances
- Stable and level mounting
- Service access
- Protection from impact
- Roof-runoff exposure
- Sound and vibration considerations
- Defrost-water path
Indoor-Unit Checks Include:
- Filter access
- Control-board access
- Drain-pan access
- Refrigerant-connection access
- Blower access
- Suitable airflow clearance
Check Supports and Fasteners
Confirm that:
- Wall brackets are securely anchored.
- Ground stands remain stable.
- Ceiling cassettes are independently supported.
- Refrigerant piping is not supporting equipment weight.
- Vibration isolation is installed where required.
Check Building Penetrations
Openings should be:
- Weather sealed
- Air sealed
- Protected against pests
- Finished according to the agreed scope
- Compatible with the building envelope
3. Verify Refrigerant Piping and Insulation
Refrigerant piping affects capacity, reliability and long-term leak risk.
Verify:
- Correct pipe diameters
- Allowed line-set length
- Allowed vertical separation
- Manufacturer-required oil-return arrangements
- Minimum number of unnecessary joints
- Correct support spacing
- No visible kinks or crushing
Check Refrigerant-Pipe Insulation
Insulation should be:
- Continuous where required
- Sealed at joints
- Protected from ultraviolet exposure outdoors
- Protected from physical damage
- Complete at wall penetrations
Check Flare or Brazed Connections
The installer should use the connection method and procedures required by the manufacturer.
Look for Mechanical Stress
Refrigerant tubing should not:
- Rub against sharp metal
- Hang unsupported
- Transmit severe compressor vibration
- Press tightly against building materials
- Contain visibly flattened bends
Document Reused Line Sets
If existing piping was retained, the report should identify how its:
- Size
- Condition
- Compatibility
- Leak integrity
- Contamination risk
were assessed.
4. Confirm Pressure Testing, Evacuation and Leak Testing
The refrigeration circuit should be tested and prepared according to the manufacturer’s procedures before final operation.
The Installation Record Should Address:
- Pressure-test method
- Approved inert test gas
- Test pressure
- Test duration
- Leak-test result
- Evacuation method
- Final vacuum measurement
- Vacuum-decay or standing test where required
Evacuation Removes Air and Moisture
Air and moisture left in the circuit can affect:
- System performance
- Lubricant condition
- Expansion devices
- Compressor reliability
Do Not Accept “The Vacuum Pump Ran for an Hour” as the Only Record
Time alone does not prove that the required vacuum level was achieved or held.
Check Accessible Connections After Startup
The technician should inspect and test applicable:
- Service valves
- Flare fittings
- Brazed joints
- Valve cores
- Factory connections where concerns exist
No Homeowner DIY Testing
Homeowners should not connect gauges, tighten refrigerant fittings or apply pressure to the circuit.
5. Verify Refrigerant Charge
Correct refrigerant charge is necessary for intended capacity, efficiency and component protection.
The Correct Method Depends On:
- Heat pump design
- Refrigerant type
- Line-set length
- Indoor-unit combination
- Outdoor and indoor conditions
- Manufacturer service procedure
Factory Charge Has Limits
The outdoor unit may contain enough refrigerant for a specified indoor combination and piping length.
Additional or reduced charge may be required when the installed piping differs from that allowance.
Record the Calculation
The installation record should state:
- Factory-charge allowance
- Measured line-set length
- Additional refrigerant required
- Refrigerant added or removed
- Total charge where required
Inverter Heat Pumps Need Manufacturer-Specific Testing
A universal pressure, superheat or subcooling target should not be applied blindly to every variable-capacity system.
Testing can require:
- Service mode
- Specified compressor speed
- Specified fan condition
- Measured ambient temperatures
- Manufacturer diagnostic software
Airflow Must Be Correct First
Incorrect indoor or outdoor airflow changes refrigeration conditions and can produce misleading measurements.
Do Not Add Refrigerant Only Because Performance Feels Weak
Charge adjustment should follow evidence and the approved procedure.
6. Check Electrical Supply and Protection
The electrical installation should be verified before and during operation.
Check Each Applicable Component For:
- Correct supply voltage
- Correct circuit
- Correct conductor size
- Correct overcurrent protection
- Required disconnect
- Secure terminations
- Required grounding and bonding
- Weather protection
Verify Operating Current
Measured current should be evaluated against:
- Equipment data plate
- Manufacturer specifications
- Operating mode
- Compressor and fan output
Check Indoor and Outdoor Power Separately
A system can contain separate electrical supplies for:
- Outdoor unit
- Air handler
- Electric heat kit
- Condensate pump
- Controls
Label Breakers and Disconnects
The homeowner should be able to identify the correct:
- Outdoor-unit breaker
- Indoor-unit breaker
- Supplementary-heat breaker
- Outdoor disconnect
Provide Permit or Compliance Documentation
The final project file should include applicable permit, inspection or certificate information for the jurisdiction.
7. Test Control Wiring and System Communication
Controls should be tested as a complete system rather than assumed correct because the display is active.
Verify:
- Thermostat model and configuration
- Heat-pump equipment type
- Reversing-valve configuration
- Heating and cooling stages
- Fan control
- Supplementary-heat stages
- Outdoor-temperature sensor
- Indoor remote sensors
- Dual-fuel logic where applicable
Communicating-System Checks
Confirm that the control correctly discovers or identifies:
- Outdoor unit
- Air handler or furnace
- Indoor heads
- Zone controls
- Accessories
Review Fault History
New equipment should not be handed over with unresolved:
- Communication faults
- Sensor faults
- Configuration warnings
- Repeated startup errors
Test Power Interruption Behaviour Where Appropriate
Confirm that important installer settings and schedules remain stored as intended after a normal power interruption.
Verify Remote Access
If Wi-Fi or app control is included, confirm:
- Account connection
- Local control remains functional
- Indoor units are correctly named
- Homeowner access is transferred properly
8. Test Heating Operation
The heat pump should be operated in heating mode using the manufacturer’s approved procedure.
Verify:
- Thermostat or controller calls for heating.
- Indoor and outdoor equipment respond.
- Reversing valve operates correctly.
- Indoor airflow develops appropriately.
- Supply or discharge air becomes warm.
- No fault code appears.
- No abnormal refrigerant or mechanical sound develops.
Allow Normal Startup Behaviour
Some systems delay or reduce indoor airflow until the indoor coil warms.
Record Available Operating Data
Depending on system type, this can include:
- Outdoor temperature
- Indoor return temperature
- Supply or discharge temperature
- Compressor output
- Fan output
- Electrical current
- Manufacturer diagnostic data
Do Not Judge Heating From Supply Temperature Alone
Useful heat delivery depends on both:
- Air temperature
- Air volume
Verify Every Heating Zone
Check that the intended rooms receive heating and that no zone remains incorrectly disabled.
9. Test Cooling Operation
The system should be tested in cooling mode when conditions and manufacturer procedures permit.
Verify:
- Cooling call is recognized.
- Reversing valve changes to the correct position.
- Indoor and outdoor fans operate correctly.
- Discharge or supply air cools.
- Condensate begins draining where conditions produce it.
- No indoor coil icing develops.
- No fault code appears.
Check Cooling Airflow
The required cooling airflow can differ from heating airflow.
Check Humidity Controls
Where included, verify:
- Dehumidification mode
- Reduced airflow command
- Humidity sensor
- Condensate management
Cold-Weather Cooling Tests Need Caution
Do not force ordinary cooling operation outside the manufacturer’s allowed conditions unless an approved service mode provides a valid procedure.
Verify All Ductless Heads
Each connected indoor unit should respond correctly in cooling mode.
10. Measure Ducted Airflow and Static Pressure
Airflow commissioning is essential for central and concealed-duct heat pumps.
Measure or Determine:
- Supply static pressure
- Return static pressure
- Total external static pressure
- Filter pressure drop where relevant
- Indoor-coil pressure drop where relevant
- Delivered airflow
- Selected blower profile
Compare With Manufacturer Data
Use the applicable:
- Blower table
- Fan curve
- Airflow setting
- Maximum allowed static pressure
- Heating and cooling airflow requirements
Test the Correct Operating Stage
Testing can be required at:
- Full heating airflow
- Full cooling airflow
- Partial capacity where applicable
- Electric heat-kit operation
- Furnace operation in a dual-fuel system
A Blower Setting Is Not an Airflow Measurement
Selecting a nominal airflow value in software does not prove that the restrictive installed ducts actually deliver that airflow.
Correct Problems Before Handover
Possible corrections include:
- Filter change
- Blower adjustment
- Return-air improvement
- Duct transition correction
- Damper adjustment
- Duct sealing
- Equipment-size reassessment
11. Check Room Airflow and Distribution
Total airflow does not prove that every important room receives a suitable share.
Check:
- Supply airflow at intended rooms
- Return-air paths
- Bedroom operation with doors closed
- Upper and lower floor distribution
- Register and damper positions
- Unexpected duct noise
New Duct Systems Should Be Balanced
Where room airflow was designed, measured room delivery should be compared with the intended values.
Existing Duct Retrofits Still Need a Comfort Review
Identify:
- Rooms with very weak airflow
- Rooms receiving excessive airflow
- Closed or inaccessible dampers
- Return-path limitations
- Disconnected or leaking branches
Do Not Balance Solely by Closing Most Registers
Excessive register closure can increase static pressure and create noise or equipment problems.
Document Known Limitations
If an existing duct system cannot provide ideal distribution without additional work, the homeowner should receive a written explanation rather than discovering it during the first cold period.
12. Test Every Ductless Indoor Unit
Every connected indoor head should be individually tested.
For Each Indoor Unit, Verify:
- Correct model and room assignment
- Heating response
- Cooling response
- Fan-speed changes
- Louvre movement
- Remote or wall-controller operation
- Temperature sensing
- Communication with the outdoor unit
- Condensate drainage
- No abnormal vibration or sound
Check Controller Labels
In multi-room installations, label remotes or app zones clearly so occupants can identify the correct unit.
Check Air Distribution
Confirm that discharge air reaches the intended occupied area without:
- Blowing continuously onto a bed
- Striking a nearby wall
- Being blocked by furniture
- Remaining trapped near a high ceiling
Check Temperature-Sensor Behaviour
A high-wall indoor unit can sense warmer ceiling-level air during heating. Where supported, verify suitable remote-sensor or temperature-offset settings.
One Working Head Does Not Commission the Complete Multi-Zone System
Each indoor unit and practical operating combination needs review.
13. Test Supplementary and Emergency Heat
A complete heating system includes the planned response when heat-pump capacity is insufficient or normal outdoor-unit operation is unavailable.
Electric Supplementary-Heat Checks Include:
- Correct heat-kit capacity
- Correct breaker and conductors
- Stage operation
- Blower airflow
- Temperature-rise limits
- Control lockouts
- Operating current
Verify AUX Heat
Confirm that the controls can call for supplementary heat under the intended conditions.
Verify Emergency Heat
Where provided, confirm that:
- The mode can be selected.
- The intended backup source operates.
- The outdoor compressor is controlled as designed.
- The homeowner knows how to return to normal operation.
Do Not Leave Backup Heat Untested
Waiting for an outdoor-unit failure during cold weather is a poor commissioning method, although nature has repeatedly demonstrated its enthusiasm for this approach.
Check Lockout Settings
Supplementary heat should not be activated unnecessarily above the intended balance or control point, except where required for defrost, emergency operation or manufacturer logic.
14. Verify Dual-Fuel Changeover
A dual-fuel system must coordinate the heat pump and furnace through one deliberate control strategy.
Verify Heat-Pump Mode
Confirm that the heat pump heats correctly when outdoor conditions are above the intended changeover point.
Verify Furnace Mode
Confirm:
- Furnace ignition
- Blower airflow
- Temperature rise
- Venting and condensate operation where applicable
- Safe shutdown
Verify Changeover Logic
The report should identify:
- Changeover temperature or method
- Outdoor-sensor source
- Compressor lockout setting
- Furnace lockout setting
- Whether simultaneous operation is allowed
Test Without Waiting for Outdoor Temperature to Change
Use the approved installer or test procedure to simulate or command each mode where the control allows it.
Explain the Strategy to the Homeowner
The homeowner should understand why the furnace may operate during:
- Colder weather
- Defrost
- Rapid recovery
- Heat-pump fault
15. Review Defrost Operation and Configuration
Defrost is a normal part of air-source heat-pump heating in cool, damp conditions.
Verify Applicable Defrost Inputs
Depending on the system, check:
- Outdoor-coil sensor
- Outdoor-air sensor
- Control-board configuration
- Fault history
- Supplementary-heat tempering
Actual Defrost May Not Occur During Commissioning
Defrost generally requires suitable outdoor temperature, moisture and coil conditions.
Use Approved Test Functions Only
Some equipment provides a defrost test or diagnostic mode. Do not bypass sensors or manually force valves without manufacturer instructions.
Explain Normal Defrost Behaviour
The homeowner should know that normal signs can include:
- Outdoor fan stopping temporarily
- System sound changing
- Steam or water vapour outdoors
- Water draining from the outdoor unit
- Temporary indoor airflow changes
Check Defrost-Water Management
The water path should not create an avoidable hazard at walkways, stairs or building entrances.
16. Test Condensate and Defrost-Water Drainage
Drainage should be tested rather than judged only by appearance.
Indoor Drain Checks Include:
- Continuous downward slope where required
- Correct trap where required
- Secure joints
- Insulation against condensation
- Suitable termination
- No leakage at the indoor unit
Condensate-Pump Checks Include:
- Pump operation
- Discharge route
- Check-valve operation where applicable
- Noise
- Accessible service location
- High-level or cutoff safety switch
Test Overflow Protection
Where an overflow switch or secondary pan is installed, confirm its intended response.
Check Ceiling and Concealed Units Carefully
A drainage failure above a finished ceiling can cause substantial damage before the homeowner notices it.
Outdoor Water Needs a Plan
Confirm that heating-mode defrost water will drain away from:
- Walkways
- Doorways
- Neighbouring property
- Building foundations
- Lower balconies
- Electrical equipment
17. Check Sound, Vibration and Operating Data
Commissioning should identify abnormal sound or vibration before the installer leaves.
Check the Outdoor Unit For:
- Cabinet vibration
- Fan contact
- Refrigerant-line resonance
- Loose panels
- Mounting movement
- Noise reflected by nearby walls
Check Indoor Equipment For:
- Blower vibration
- Duct resonance
- Whistling filters or registers
- Cross-flow fan noise
- Condensate-pump noise
- Loose wall-unit covers
Record Representative Operating Data
Useful information can include:
- Indoor and outdoor temperature
- Supply and return temperature
- Static pressure
- Airflow
- Voltage
- Current
- Compressor or fan command
- Fault-code status
Compare Sound With Normal Equipment Operation
Variable-capacity systems naturally change sound as compressor and fan speed change.
Correct Simple Resonance Early
A pipe or panel that vibrates during commissioning rarely develops a philosophical objection to vibrating later.
18. Complete Homeowner Handover and Documentation
The project is not complete until the homeowner can operate and maintain the system appropriately.
Demonstrate:
- Heat and Cool modes
- Fan settings
- Normal temperature adjustment
- Schedules
- AUX Heat
- Emergency Heat where applicable
- Ductless fan and louvre controls
- Filter access
- Fault-code reporting
Explain Normal Heat-Pump Behaviour
Discuss:
- Longer heating cycles
- Lower supply-air temperatures than many furnaces
- Variable fan speed
- Defrost steam and water
- Compressor restart delays
- Modest setback use
Provide Documentation
The homeowner should receive:
- Owner’s manuals
- Installation record
- Commissioning report
- Equipment model and serial numbers
- Warranty documents
- Product-registration confirmation
- Applicable permit records
- Maintenance instructions
Explain Maintenance
Include:
- Filter size and type
- Filter cleaning or replacement method
- Outdoor-unit clearance
- Annual service recommendation
- Condensate-pump maintenance where applicable
Record Unresolved Items
Any required return visit, seasonal test, finish repair or outstanding document should appear on a written deficiency or completion list.
Heat Pump Commissioning Report Checklist
| Commissioning Item | Recommended Evidence | Status |
|---|---|---|
| Indoor and outdoor equipment match | Model and serial numbers | Pass / Corrective Work Required |
| Equipment location and clearance | Visual inspection and photographs | Pass / Corrective Work Required |
| Line-set size and length | Recorded size and measured length | Pass / Corrective Work Required |
| Pressure and leak test | Test method, pressure and result | Pass / Corrective Work Required |
| Evacuation | Final vacuum and standing-test result | Pass / Corrective Work Required |
| Refrigerant charge | Factory allowance and added or removed weight | Pass / Weather-Limited / Corrective Work Required |
| Electrical supply | Voltage, protection and operating-current checks | Pass / Corrective Work Required |
| Thermostat and controls | Configuration and functional test | Pass / Corrective Work Required |
| Heating operation | Temperatures, response and fault review | Pass / Weather-Limited / Corrective Work Required |
| Cooling operation | Temperatures, response and drain operation | Pass / Weather-Limited / Corrective Work Required |
| Ducted airflow | Measured or verified airflow | Pass / Corrective Work Required / Not Applicable |
| Static pressure | Supply, return and total external static pressure | Pass / Corrective Work Required / Not Applicable |
| Room distribution | Room airflow or practical comfort review | Pass / Corrective Work Required |
| Every ductless indoor unit | Heating, cooling, fan, louvre and drain tests | Pass / Corrective Work Required / Not Applicable |
| Supplementary and Emergency Heat | Functional test and control settings | Pass / Corrective Work Required / Not Applicable |
| Dual-fuel changeover | Heat-pump, furnace and control tests | Pass / Corrective Work Required / Not Applicable |
| Condensate drainage | Drain and overflow test | Pass / Corrective Work Required |
| Homeowner handover | Signed or acknowledged document package | Complete / Outstanding |
A Blank Form Is Not Commissioning
The report should contain actual:
- Measurements
- Settings
- Results
- Limitations
- Corrective actions
What Can Homeowners Verify Before Final Payment?
Homeowners should not perform technical refrigeration or electrical testing, but they can witness important functional checks.
Ask the Installer to Demonstrate:
- Heating from every intended zone
- Cooling where weather and equipment permit
- Fan-speed changes
- Thermostat or controller response
- AUX or backup heat
- Emergency Heat where applicable
- Condensate drainage
- Filter removal and replacement
- App or remote-control access
Walk Through the Home
Check for:
- Unserved rooms
- Strong drafts onto beds or seating
- Abnormal duct noise
- Visible water leakage
- Loose line covers
- Unfinished penetrations
- Excessive vibration
Request the Completed Report
Do not settle for a promise that measurements are “in the company system” unless a copy will be supplied.
Confirm Outstanding Work in Writing
Record:
- Weather-limited tests
- Missing documents
- Required finish work
- Parts on order
- Scheduled return visit
Do Not Demand Unsafe Demonstrations
Homeowners should not ask the installer to:
- Bypass pressure protection
- Force defrost incorrectly
- Operate cooling outside approved conditions
- Open live electrical panels for observation
- Release refrigerant to demonstrate charge
Commissioning a Central Ducted Heat Pump
Ducted systems require both equipment commissioning and air-distribution verification.
Priority Checks Include:
- Indoor and outdoor equipment match
- Filter arrangement
- Blower configuration
- Total external static pressure
- Delivered airflow
- Supply and return temperature
- Room balancing
- Backup-heat airflow
Test Heating and Cooling Profiles
The air handler can use different airflow settings for:
- Low-stage heating
- High-stage heating
- Cooling
- Dehumidification
- Electric heat
- Continuous fan
Existing Ducts Need Evidence
The fact that the old furnace moved some air through the ducts does not prove they can deliver the new heat pump’s required airflow.
Verify Return Air
Insufficient return capacity can cause:
- High static pressure
- Weak room airflow
- Noise
- Higher blower power
- Reduced heat transfer
Record the Final Blower Setting
Future service technicians should be able to identify the commissioned airflow configuration.
Commissioning a Ductless Heat Pump
Ductless systems do not require central-duct static-pressure testing, but they still require systematic commissioning.
Check Every Indoor Unit For:
- Correct room and outdoor-unit connection
- Heating and cooling
- Fan operation
- Louvre operation
- Temperature sensing
- Controller communication
- Condensate drainage
- Noise and vibration
Check Every Refrigerant Connection
Single-zone and multi-zone systems commonly use field-installed piping and connections that require documented leak integrity.
Review Air Distribution
An indoor unit can function correctly while being poorly positioned for:
- Closed bedrooms
- Another floor
- Rooms around corners
- Furniture-obstructed areas
Test the Remote or Wall Controller
Explain:
- Heat and Cool modes
- Fan Auto
- Quiet mode
- Timer
- Louvre control
- Fault indicators
Commissioning a Multi-Zone Heat Pump
A multi-zone system is not fully commissioned after testing only the easiest indoor head to reach.
Record the Complete Combination
Identify:
- Outdoor-unit model
- Every indoor-unit model
- Every indoor-unit serial number
- Line-set length for each zone where required
- Branch components
- Total refrigerant charge
Test Individual Zones
Confirm each unit:
- Starts
- Stops
- Changes fan speed
- Responds to its controller
- Drains correctly
- Reports no communication fault
Test Practical Combinations
Operate several zones together to verify:
- Outdoor-unit response
- Communication stability
- Capacity distribution
- No unexpected mode conflict
Verify Mode Limitations
Explain whether the system can or cannot provide simultaneous heating and cooling.
Check Small-Zone Behaviour
Where practical, observe operation with only one smaller zone calling to identify excessive cycling or control issues.
Commissioning a Full-Electric Heat Pump
A full-electric system must verify both efficient compressor heating and the supplementary resistance-heating system.
Check:
- Heat-pump heating
- Electric heat-kit stages
- Heating airflow
- Operating current
- AUX Heat control
- Emergency Heat
- Outdoor-temperature lockouts
- Defrost tempering where applicable
Confirm Peak Electrical Operation
The electrical system should support the intended combination of:
- Outdoor heat pump
- Indoor blower
- Electric heat stages
- Other associated equipment
Prevent Unnecessary Resistance Operation
Review thermostat settings that could activate electric heat during:
- Small setpoint changes
- Mild outdoor conditions
- Normal low-capacity operation
Do Not Disable Required Backup Heat
The original design may depend on resistance heat for peak load, defrost or equipment-failure conditions.
Commissioning a Dual-Fuel Heat Pump
Dual-fuel commissioning requires heat-pump, furnace and integrated-control testing.
Heat-Pump Checks Include:
- Heating capacity response
- Indoor coil airflow
- Outdoor-unit operation
- Defrost controls
Furnace Checks Include:
- Ignition sequence
- Gas input where applicable
- Temperature rise
- Blower operation
- Venting
- Condensate drainage
- Safety controls
Integrated-Control Checks Include:
- Outdoor-temperature sensing
- Changeover setting
- Compressor lockout
- Furnace lockout
- Emergency operation
- Mode indication
Check Coil and Furnace Compatibility
The indoor coil should not create unacceptable:
- Static pressure
- Furnace temperature rise
- Blower loading
- Condensate-management problems
Provide a Dual-Fuel Commissioning Record
The final document should show that both heating sources and the transition between them were tested.
Commissioning R-32 and R-454B Heat Pumps
R-32 and R-454B systems use A2L refrigerants and must follow refrigerant-specific equipment and installation requirements.
Verify:
- Correct refrigerant type
- Recorded total charge
- Approved indoor and outdoor equipment combination
- Applicable room-size or charge-limit requirements
- Required labels
- Approved service procedures
Detection and Mitigation Systems
Where the equipment includes refrigerant detection, commissioning should verify the manufacturer-defined:
- Sensor status
- Blower response
- Compressor response
- Fault indication
- Control configuration
Do Not Create a Leak to Test the Sensor
Use the manufacturer’s approved test or simulation method.
Do Not Disable Safety Controls
A recurring sensor fault requires diagnosis rather than bypassing the component.
Document Required Room Openings or Mitigation Features
The homeowner should understand that an opening, grille or control required by the certified design must not be removed casually during later renovation.
What Happens When a Commissioning Check Fails?
A failed test should lead to correction and retesting, not deletion of the inconvenient row from the form.
Possible Corrective Work Includes:
- Reconfiguring controls
- Correcting wiring
- Adjusting blower setup
- Improving return air
- Repairing duct leakage
- Correcting refrigerant charge
- Repairing a leaking connection
- Re-routing condensate drainage
- Correcting equipment mounting
- Replacing an incorrect component
Major Design Failure
Commissioning can reveal that:
- The selected heat pump is unsuitable.
- The ducts cannot support required airflow.
- A zone is substantially oversized.
- The electrical design is incomplete.
- Backup heating is insufficient.
Document the Resolution
The final report should identify:
- Original failed result
- Corrective action
- Retest result
- Any remaining limitation
Do Not Use Installer Settings to Hide a Design Problem
Reducing equipment output merely to stop noise or high static pressure can sacrifice required capacity.
Should Heat Pump Commissioning Cost Extra?
For a new heat pump installation, normal commissioning should be included in the installation scope and price.
The Quote Should State What Is Included
Examples include:
- Startup
- Refrigerant procedures
- Airflow verification
- Control configuration
- Backup-heat testing
- Drain testing
- Commissioning report
- Homeowner handover
Additional Charges Can Arise When:
- A third-party commissioning service is requested.
- A separate seasonal return visit is required.
- Existing ducts need corrective work.
- An unrelated pre-existing defect is discovered.
- Additional balancing or redesign was excluded from the contract.
Ask Before Signing
Do not wait until installation day to discover that airflow measurement, permits or seasonal verification were excluded.
Existing-System Diagnosis Is Different
Bernoulli Heating and Cooling’s current diagnostic appointment charge for troubleshooting an existing heat pump is $135.
Repair labour, replacement parts, refrigerant and additional materials are separate.
New Installation Estimates
New heat pump installation and replacement estimates are free.
Commissioning Requirements to Put in the Installation Quote
- A written commissioning process is included.
- Exact equipment models will be recorded.
- Pressure testing and evacuation will be documented.
- Refrigerant charge will follow the manufacturer procedure.
- Electrical operation will be verified.
- Heating and cooling will be tested where conditions permit.
- Ducted airflow and static pressure will be measured or otherwise verified appropriately.
- Every ductless indoor unit will be tested.
- Supplementary and Emergency Heat will be demonstrated.
- Dual-fuel changeover will be tested where applicable.
- Condensate drainage and safety switches will be tested.
- Weather-limited tests will be identified.
- Corrective work will be retested.
- The homeowner will receive a completed commissioning report.
- Permits, manuals and warranty documents will be provided.
- Homeowner operating instruction is included.
Heat Pump Installation and Commissioning in Metro Vancouver and Fraser Valley
Bernoulli Heating and Cooling provides new heat pump installation and replacement planning across Metro Vancouver and Fraser Valley.
Installation planning can include equipment selection, heating and cooling loads, duct or zone design, electrical requirements, supplementary heating, equipment locations, controls and commissioning scope.
New heat pump installation and replacement estimates are free.
The current $135 diagnostic appointment charge applies to troubleshooting an existing heat pump. Repair labour, replacement parts, refrigerant and additional materials are separate.
Call 604-518-4438 or email heatingbernoulli@gmail.com.
For local installation information, review:
Heat Pump Commissioning: Frequently Asked Questions
What is heat pump commissioning?
It is the process of configuring, testing, measuring and documenting a newly installed heat pump to verify that it operates according to the design and manufacturer requirements.
Is commissioning the same as startup?
No. Startup confirms that equipment turns on. Commissioning verifies how the complete system operates.
Why is heat pump commissioning important?
It can identify incorrect airflow, control configuration, refrigerant charge, electrical operation, drainage or backup-heating problems before they become long-term comfort or reliability complaints.
Should every new heat pump be commissioned?
Yes. The exact tests vary by system type, but every new installation should receive appropriate functional verification.
Who commissions a residential heat pump?
The installing HVAC contractor normally completes the equipment commissioning, with qualified electrical, gas or other trades completing their applicable verification.
Can a homeowner commission a heat pump?
No. Homeowners can witness user-level operation, but technical refrigeration, electrical, airflow and combustion testing require qualified personnel.
Should commissioning be included in the quote?
Yes. The quote should state what tests, measurements and documentation are included.
Should commissioning cost extra?
Normal commissioning should be part of the new installation scope. Separate third-party, seasonal or corrective work can involve additional cost.
How long does heat pump commissioning take?
Time depends on system type, number of zones, duct testing, backup heat, controls and whether corrective work is required.
Can commissioning be completed on installation day?
Many checks can, but weather-sensitive heating, cooling, refrigerant or defrost verification may require an approved test mode or later follow-up.
Can a heat pump be commissioned during winter?
Yes, although ordinary cooling tests may be limited by outdoor conditions.
Can a heat pump be commissioned during summer?
Yes, although full heating and defrost verification may be limited.
What is a weather-limited commissioning test?
It is a test that cannot produce valid results because indoor or outdoor conditions fall outside the manufacturer’s approved procedure.
Should the installer return in another season?
A return visit can be appropriate when a critical test cannot be completed and no valid manufacturer test mode is available.
What equipment information should be recorded?
Record manufacturers, model numbers, serial numbers, refrigerant type, controls and supplementary-heating equipment.
Why do serial numbers matter?
They support warranty registration, parts identification and future service.
Should the AHRI reference be checked?
Where applicable, it helps confirm the certified indoor and outdoor equipment combination.
What if the contractor installed a different model?
The substitution should be reviewed for capacity, efficiency, controls, electrical requirements, warranty and eligibility before acceptance.
Should shipping damage be checked?
Yes. Cabinet, coil, fan and electrical damage should be identified before handover.
Should outdoor-unit clearances be verified?
Yes. Inadequate clearance can restrict airflow and service access.
Should the outdoor unit be level?
It should be mounted according to manufacturer requirements on a stable support.
Should vibration be checked?
Yes. Excessive vibration can indicate mounting, piping, fan or cabinet problems.
Should refrigerant-line length be recorded?
Yes, because piping length can affect charge requirements and allowed installation limits.
Should refrigerant pipe size be verified?
Yes. Incorrect pipe size can affect performance and oil return.
Should line-set insulation be inspected?
Yes. Missing or damaged insulation can cause condensation, heat gain or heat loss.
What is a refrigerant pressure test?
It uses an approved procedure and inert test gas to check the installed piping for leakage before operation.
What is evacuation?
Evacuation removes air and moisture from an opened refrigeration circuit.
Why should the vacuum measurement be recorded?
It provides evidence that the required vacuum level and standing condition were achieved.
Does running a vacuum pump for a set time prove evacuation?
No. System volume, moisture, leaks and equipment affect the result, so measurement is required.
Should the heat pump be leak tested after startup?
Accessible connections should be checked according to the manufacturer’s procedure.
How is refrigerant charge verified?
The technician uses the method specified for the exact equipment, refrigerant, piping and operating conditions.
Can pressure alone prove correct charge?
No. Pressure depends on temperature, airflow, compressor speed, mode and equipment design.
Should refrigerant be weighed?
Manufacturer procedures commonly require charge adjustments to be measured by weight.
What is a check-charge mode?
It is a manufacturer-provided service mode that places the system in a defined operating condition for charge verification.
Can every inverter heat pump use standard superheat or subcooling targets?
No. Use the exact manufacturer procedure.
Why must airflow be checked before refrigerant charge?
Incorrect airflow changes coil temperatures and pressures, which can make charge measurements misleading.
Should voltage be measured?
Qualified commissioning should confirm correct electrical supply to applicable components.
Should compressor amperage be checked?
Operating current can be compared with equipment specifications and actual operating output.
Should breakers be labelled?
Yes. Indoor, outdoor and supplementary-heat circuits should be identifiable.
Should an electrical permit be provided?
The homeowner should receive the applicable permit, inspection or compliance record required by the jurisdiction.
Should the thermostat be tested?
Yes. Heating, cooling, fan, supplementary heat and applicable sensor functions should be verified.
Can incorrect thermostat settings damage performance?
Yes. Incorrect equipment type, stages, reversing valve or backup-heat configuration can cause improper operation.
Should Wi-Fi controls be connected before handover?
If included in the contract, the installer should demonstrate setup while ensuring the homeowner controls the final account credentials.
Should heating be tested during installation?
Yes, using an approved procedure suitable for the available conditions.
Should cooling be tested during installation?
Yes where conditions or an approved service mode allow a valid test.
What temperature split should a heat pump have?
There is no universal number. It depends on airflow, capacity, outdoor conditions, mode and equipment design.
Does warm air prove the heat pump is properly commissioned?
No. Airflow, capacity, controls, refrigeration and backup heat still require verification.
Should static pressure be measured?
For central and concealed-duct systems, static-pressure testing is an important way to evaluate duct resistance and airflow.
What is total external static pressure?
It is the pressure resistance imposed on the blower by the installed external system components included in the manufacturer’s test definition.
Does selecting 1,200 CFM in the control prove actual airflow?
No. The installed ducts may prevent the blower from delivering the selected airflow.
How can actual airflow be determined?
Methods can include direct airflow measurement, approved flow devices, duct traverse or manufacturer blower data combined with measured static pressure.
Should airflow be tested in both heating and cooling?
Yes when the system uses different blower profiles for the two modes.
Should electric-heat airflow be tested?
Yes. Resistance heat requires suitable airflow for safe operation.
Should room airflow be balanced?
Newly designed duct systems should be balanced to their intended room flows. Existing systems should receive an appropriate distribution review.
Can the installer balance rooms by closing most registers?
Excessive closure can raise static pressure. Balancing should preserve acceptable total system airflow.
Should bedroom airflow be checked with the door closed?
It can reveal an inadequate return-air path or room pressure problem.
Should every ductless head be tested?
Yes. Each indoor unit should be tested for operation, controls, airflow, communication and drainage.
Should every ductless drain be tested?
Yes. A visually sloped drain can still leak, trap water or fail under actual flow.
Should mini-split louvres be tested?
Yes. Motorized vanes should respond to the controller and distribute air appropriately.
Should multi-zone heads be tested together?
Practical combinations should be tested to confirm communication and shared outdoor-unit response.
Can one multi-zone head heat while another cools?
Many conventional residential systems cannot provide simultaneous heating and cooling. The installer should explain the exact system’s limitations.
Should AUX Heat be tested?
Yes, even when outdoor weather is mild.
Should Emergency Heat be tested?
Yes where the system provides that mode.
Does testing Emergency Heat require breaking the outdoor unit?
No. Use the approved control or service procedure.
Should electric heat-kit amperage be checked?
Yes. Stage operation and electrical loading should be verified by qualified personnel.
Should a dual-fuel furnace be tested?
Yes. The furnace and heat pump are both parts of the installed heating system.
Should dual-fuel changeover be tested during mild weather?
Yes, using the approved installer procedure or simulated control input where supported.
What should the dual-fuel report record?
It should record the changeover strategy, outdoor sensor, compressor lockout, furnace operation and control response.
Should defrost be tested?
Actual defrost may not be available under all conditions. Configuration, sensors and approved test functions should be reviewed.
Is steam from the outdoor unit normal?
Water vapour can be normal near the end of a winter defrost cycle.
Should defrost water be checked?
Yes. It should not create avoidable ice hazards or building damage.
Should a condensate pump be tested?
Yes, including its discharge and applicable overflow or cutoff switch.
Should ceiling-cassette overflow protection be tested?
Yes. Concealed water leakage can cause significant building damage.
Should operating sound be recorded?
Abnormal noise should be investigated, while representative sound or video can help document intermittent concerns.
Is variable compressor sound normal?
Yes. Inverter equipment changes compressor and fan speed as load changes.
Should the homeowner receive a commissioning report?
Yes. It is useful for warranty, future service and documenting the original installed condition.
What should the report contain?
It should contain equipment identification, measurements, control settings, test results, limitations and corrective work.
Should the homeowner receive manuals?
Yes, along with warranty, registration, permit and maintenance information.
Should the installer explain defrost?
Yes. Understanding normal winter behaviour prevents unnecessary shutdowns and service calls.
Should the installer explain Emergency Heat?
Yes, including how to activate it and return to normal operation.
Should filter size be documented?
Yes. Record the correct dimensions, type, airflow direction and replacement guidance.
Should outstanding work be written down?
Yes. Weather-limited tests, finish work, missing documents and required return visits should appear on a completion list.
What if the system fails a commissioning test?
The cause should be corrected and the affected test repeated.
Can the installer simply lower the blower speed to fix duct noise?
Not without verifying that required heating, cooling and backup-heat airflow remain available.
Can commissioning reveal an undersized duct system?
Yes. High static pressure and insufficient measured airflow can expose duct limitations.
Can commissioning reveal an oversized heat pump?
It can identify cycling or control concerns, although proper sizing should have been addressed during design.
Can commissioning prevent every future repair?
No. It reduces avoidable installation faults but cannot guarantee that components will never fail.
Does commissioning replace annual maintenance?
No. Commissioning establishes correct initial operation, while maintenance supports ongoing performance.
Should commissioning records be kept after the warranty ends?
Yes. They remain useful for diagnosis, replacement planning and documenting original settings.
How much does Bernoulli charge for a new heat pump commissioning appointment?
Commissioning for a new Bernoulli installation should be addressed within the installation proposal rather than treated as ordinary existing-system diagnosis.
How much is diagnosis for an existing heat pump?
The current diagnostic appointment charge is $135.
Does the $135 include repairs?
No. Repair labour, replacement parts, refrigerant and additional materials are separate.
Are new heat pump installation estimates free?
Yes. New installation and replacement estimates are currently free.