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Ultra Heat GMV VRF Technical Service Manual COMMISSIONING OPERATION
87
code
‖U3‖ should disappear.
3.2.4 Communication system check
(1) The following communication contents must be checked again before commissioning:
(2) Communication cables cannot be laid out in the same trough as power cables. Communication
cables should be independently laid out in hard fire-resistant PVC tubes. The parallel spacing between
communication cables and strong electric wires should be larger than 20 cm.
3.2.5 Spot check
Spot Check for Ultra Heat GMV Commissioning
SN Spot Check Item Qualified
1 Is the engineering design diagram complete?
2 Does the construction comply with the design diagram?
3 Is the rated capacity of the IDU/ODU of a single refrigerating system within 50%-135%?
4 Is the number of connected IDUs in a single refrigerating system within 80?
5 Is the access capacity of a fresh-air unit within 30%?
6 Does the difference of level between IDUs and ODUs comply with unit design requirements?
7 Does the difference of level between IDUs comply with unit design requirements?
8
Are long pipes of IDUs and ODUs less than or equal to 165 m
（
541ft
）
?
9
Is the total length of pipes less than 1000 m
（
3280ft
）
?
10
Is the spacing between the ODU and the first disperse pipe larger than 90 m
（
295ft
）
? If yes, is the
corresponding pipe diameter increased?
11
Is the spacing between the IDU and the nearest disperse pipe larger than 10 m
（
33ft
）
? If yes, is the
corresponding pipe diameter increased?