GENERAL Assist Technical Reference

VRF VII / VR-II / VIII - Test Run Procedure

How to initiate and stop a VRF test run from the outdoor PCB or connected controllers
Overview: A test run can be initiated from the outdoor unit PCB or, depending on the controller fitted, from a wired, wireless, simple, 2-wire, touch-panel or central remote controller. When a test run is initiated, the system operates in a dedicated test mode for commissioning and operational checks.
Important: Test run operation should only be carried out by suitably qualified service or commissioning personnel. Confirm the refrigerant system is complete, powered correctly and ready to operate before initiating test mode.

1. Test Run from the Outdoor PCB

All indoor units connected to the outdoor unit can be test-operated using the outdoor PCB push-button settings. This procedure is performed from the master outdoor unit.

StepActionDisplay / Function
1From the normal monitoring condition, press MODE / EXIT (SW107) once.Mode selection
2Press SELECT (SW108) until Function Mode is selected.F3
3Press ENTER (SW109).Function selection
4Use SELECT (SW108) to choose the required test-run function.00 = Cooling test run
01 = Heating test run
02 = Test run stop
91 = Central control forced reset
5Hold ENTER (SW109) for at least 3 seconds.Command executed
6After execution is complete, press ENTER, or allow the approximately 5-second timeout.Returns to function selection
7Press MODE / EXIT to return to normal monitoring.Normal monitor display
Recommended commissioning method: Using the outdoor PCB gives direct control of the complete refrigerant circuit and avoids differences between controller types.

Stopping a test run from the outdoor PCB

Repeat the Function Mode procedure and select 02 - Test Run Stop, then hold ENTER (SW109) for at least 3 seconds.

2. Test Run from Remote Controllers

2.1 Standard wired remote controller - UTY-RNK series

  • Stop the indoor unit before initiating the test-run command.
  • Use the controller's dedicated test-run button combination and hold it for more than 2 seconds.
  • The air conditioner enters test run and the test-run indication appears on the controller display.
  • The normal temperature-setting control is restricted during test operation; other display and protection functions continue to operate.
  • To stop the test run, press START / STOP.

2.2 Standard wireless remote controller - UTY-LNH series

  1. Ensure the air conditioner is running.
  2. Press the TEST RUN button on the wireless remote controller.
  3. During test run, the indoor-unit OPERATION and TIMER lamps flash slowly at the same time.
  4. To end test run, press START / STOP.

2.3 Simple remote controller - UTY-RSK series

  • Stop both the indoor and outdoor units.
  • Use the controller's specified test-run button combination and hold it for more than 3 seconds.
  • The controller displays the test-run indication while the system operates.
  • To stop test run, use the controller's stop command.
  • Check for abnormal sound or vibration while the system is operating.

2.4 2-wire wired remote controller - UTY-RNR series

1From the Monitor screen, press Menu.
2Press Next Page, then select Maintenance.
3Press Next Page, then select Test Run.
4Confirm with OK.

The test run continues for approximately 60 minutes. To interrupt it before completion, return to the Monitor screen and turn the unit OFF.

2.5 Touch Panel Controller - UTY-DTG series

  1. From the Monitor screen, select the indoor unit or units to be test-run. Multiple selections are possible.
  2. Press Operation to open the Operation Setting screen.
  3. Select Optional Setting.
  4. In the Details / Optional Setting screen, select Start under Test Operation.
  5. Press OK to send the command.

The test run continues for approximately 60 minutes. To stop it earlier, select the device being test-run and issue an OFF / Stop command.

2.6 Central Remote Controller - UTY-DCG series

  1. Open the controller menu.
  2. Select Set-up Menu and enter the required password.
  3. Select Indoor Unit Special Setting.
  4. Select Test Operation.
  5. Choose Select All or Identify Unit as required.
  6. Press Start.

The test run continues for approximately 60 minutes. To interrupt it, return to the Monitor screen and issue an OFF command.

3. What Happens During Test Run

  • The test-run command is transmitted through the remote controller, transmission network or outdoor unit.
  • The electronic expansion valve is driven toward maximum flow irrespective of normal room-temperature control.
  • Frost-prevention protection has priority over the test-run command.
  • All indoor units on the same refrigerant circuit operate in the mode selected at the outdoor unit.
  • Test run stops automatically after approximately 60 minutes.
  • Normal test-run initialisation is shown below.
ParameterCoolingHeating
Fan speedHighHigh
Room temperature indication18°C30°C
SwingOFFOFF
Note: The displayed test-run temperature is a test-mode operating condition and should not be interpreted as the normal customer set temperature.

4. Commissioning Checks During Test Run

  • Confirm all expected indoor units start and communicate normally.
  • Confirm the selected cooling or heating mode is achieved across the refrigerant circuit.
  • Check for abnormal noise, vibration or mechanical contact.
  • Confirm indoor fan operation and airflow.
  • Check outdoor fan and compressor operation.
  • Verify that no new error codes are generated.
  • Confirm refrigerant pipe temperatures and system pressures respond appropriately for the selected mode.
  • Confirm condensate drainage during cooling operation.
  • At completion, stop test run and verify the system returns to normal controller operation.
Quick reference - Outdoor PCB:
MODE / EXIT → SELECT to F3 → ENTER → SELECT 00 Cooling / 01 Heating / 02 Stop → hold ENTER for at least 3 seconds.
This article is intended as a field reference for qualified service and commissioning personnel. Controller appearance and menu wording may vary by controller generation and system configuration.