Commissioning Operation - Gree Ultra Heat GMV Multi VRF Heat Pump Series Service Manual

Ultra Heat GMV VRF Technical Service Manual
12 Does the wall thickness of copper tubes meet design requirements?
13 Are disperse pipes horizontal or vertical?
14 Does the diameter of cables connected with IDUs and ODUs comply with unit design requirements?
15 Do the circuit breaker and leakage switch comply with unit design requirements?
16 Is the spacing between the power cable and the TV set larger than 1 m?
17 Do communication cable materials comply with unit design requirements?
18 Are all communication cables of IDUs and ODUs serially connected?
19 Is the last-communicating IDU installed with a communication-matched resistance?
20 What is the load of the selected IDU model?
21 Is the foundation of ODU firm? Do shock absorption and water drainage comply with requirements?
22 Are basic modules installed on the same horizontal line?
23 Does the drainage pipe of IDU retain a 1/100 ratio of slope?
24 Is the drainage of IDU smooth?
25 Does a U-shaped trap exist in the drainage pipe of IDU?
Are the air outlet and air return vent of IDU connected with soft connectors? Is a plenum chamber
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installed for air return?
27 Is the water pipe of IDU installed with an air exhaust vent?
28 Is "MASTER" stuck to the wired controller or panel of the master IDU?
29 Does appending refrigerants to the system comply with requirements?
30 Does the ODU run with static pressure? Has a static pressure value been set?
31 Has the ODU been preheated for more than eight hours before commissioning?

3.3 Commissioning Operation

3.3.1 Precautions
(1) Before starting commissioning, make sure that the unit compressor has been preheated for more
than eight hours and check whether preheating is normal by touching. Commissioning can be started
only when preheating is normal. Otherwise, the compressor may be damaged.
Commissioning must be performed or guided by professional personnel.
 Before starting commissioning, the outdoor unit must be power-on for more than 8 hours. Otherwise,
compressor may be damaged.
 During daily operation, please keep the outdoor unit power-on at any time.

If unit is power-off for more than 24 hours, it must be preheated for at least 8 hours before operation.
(2) When unit commissioning is started, the system automatically selects an operation mode
according to the environment temperature:
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COMMISSIONING OPERATION