Gree GMV-224WM/B-X, Service Manual

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GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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IV. Onsite Review of Design Drawing
Installation personnel must carefully read and understand the design scheme and drawings
provided by engineering designers, and prepare detailed and feasible construction organization design
after reviewing the onsite status.
The following aspects of working drawing must be reviewed:
1. The loads of indoor and ODUs must match. The gross rated capacity of the IDU should be set to
a value that is 50% to 135% of the rated capacity of the ODU. In actual conditions, if the capacity of
concurrently operating IDUs exceeds 100% of the rated capacity of the ODU, the air conditioning system
fails to meet the requirement. Note: Configuration in excess of the capacity of the IDUs can affect the
comfort for users. The more the excess is, the lower the adjustment capacity of an air conditioning unit
will be. When the capacity exceeds 135% of the configured value, the system reliability can be affected.
Therefore, relevant regulations on capacity limit must be strictly followed.
2. The difference of level between an ODU and an IDU, and that between IDUs must be set within
the designed range.
3. Pipe bend for trapped oil is required for air pipe riser in the unit to ensure normal circulation in the
unit lubricating system.
4. The pipe diameter and manifold type in the cooling system must meet relevant technical
specifications.
5. The drainage method of unit condensate water must be reasonable; the pipeline slope must
follow the design requirement of unit.
6. The air duct direction and air flow are reasonably organized.
7. The configuration specifications, type, and control method of power cables should meet the
design requirement of unit.
8. The arrangement, total length, and control method of control line should meet the design
requirement of unit.
Note: Engineering construction personnel must strictly abide by the design drawings. If any design
cannot be implemented during construction and needs to be modified, contact the designer first for
approval and prepare a written document, that is, the design modification record.