GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
123
Does the stop valve of
outdoor unit reach the
maximum opening
degree?
2) Check system refrigerants before startup
Before the system is started, connect the liquid-tube valve of ODU with a high pressure gauge and
the air-tube valve of ODU with a low pressure gauge, and then read their values. In this case, high
pressure and low pressure of the system should be in balance status, and the difference between the
saturation temperature corresponding to the balanced pressure value and the environment temperature
(the higher in outdoor and indoor temperatures is taken as environment temperature) should not be
larger than 5°CK. If the difference is larger than 5°C K, it is required to check the ODU for leakage.
NOTE:
Guarantee that the system has never been started before this test. Otherwise, the high
pressure value will be over-higher than the environment temperature or the low pressure value will be
over-lower than the environment temperature.
Example:
The outdoor environment temperature is 30°C(86
℉
) and the indoor environment temperature is
28°C(82
℉
). The pressure gauges connected with the system show that the high pressure value is
28°C(82
℉
) and the low pressure value is 27°C(81
℉
). The difference between the outdoor environment
temperature and either pressure value is less than 5°C K. It indicates that the system standby pressure
is normal.
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