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(6) Check the valve: fully open the gas and liquid valve.
5.2.2 Trial run
5.2.2.1 Notices
(1) Before test operation, make sure unit is power on and compressor has been preheated for more
than 8 hours. Touch the unit to check whether it's normally preheated. Start test operation after unit is
normally preheated, otherwise compressor might be damaged. Debugging must be performed by
professional technicians or under the guide of professional technicians.
(2) When debugging starts, system will operate according to the ambient temperature.
1) When outdoor temperature is above 20ºC(68°F), debugging shall be in cooling mode.
2) When outdoor temperature is below 20ºC(68°F), debugging shall be in heating mode.
(3) Before debugging, confirm again whether the cut-off valve of each basic module is fully turned on.
(4) During debugging, front panel of the outdoor unit must be fully closed; otherwise, debugging
accuracy will be affected (see below).
(5) Before debugging, make sure the needed amount of refrigerant has been added to the pipe or at
least 70% of the needed refrigerant has been added.
(6) Description of each stage of debugging progress:
Description of each stage of debugging progress
——
Debugging code
Progress
Progress code
LED1
LED2
Fig.52
Fig.53
Status code
LED3
44
Ultra Heat GMV Multi VRF
Meaning
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