Gree GMVVQ1015WM/C-X, Service Manual

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Gree GMV6 HR DC Inverter VRF Units Service Manual
221
Chapter 4 Repair
WARNING!
During the maintenance of a modular unit, all the outside units must be powered on and off
concurrently. Avoid doing so to only some of the outdoor units.
1 Precautions for Refrigerant Leakage
(1) AC project designers and installers shall obey the local laws and regulations on the safety
requirement of the usage and leakage of refrigerant.
(2) The multi VRF unit adopts R410A refrigerant. When installing in the space with people, the
refrigerant amount shall not exceed the max.allowable concentration. Otherwise, suffocation
will occur. For example, the max.allowable concentration for refrigerant of European safety
standard and regulation is 0.44kg/m
3
.
Max. refrigerant charge(kg)= Room volume(m3)× max. allowable concentration(kg/m
3
)
Refrigerant charge
（
kg
）
= Adding quantity of refrigerant
（
kg
）
+ ∑ex
-factory charge of ODU
（
kg
）
Refrigerant charge ≤ Max. refrigerant charge
(3) When refrigerant charge has exceeded the max.refrigerant charge, re-design the refrigeration
system and divide the refrigeration system to several refrigeration systems of small volume,
or add corresponding ventilation measures and alarms.
①
The flow when refrigerant is leaking;
②
For the room with leaked refrigerant, as the density of refrigerant is higher than that of air,
please pay attention to the locations which might have refrigerant, e.g basement.
2 Refrigerant Charging
Total refrigerant c
harging amount R= Pipeline charging amount A + Σ
charging amount B of
every module.
2.1 Pipeline charging amount:
Pipeline charging amount A= Σ
Liquid pipe length × refrigerant charging amount of every 1m
liquid pipe.
Diameter of
liquid pipe
(mm)
Φ28.6 Φ2
5.4
Φ22.2 Φ19.05 Φ15.9 Φ12.7 Φ9.52 Φ6.35
kg/m 0.680 0.520 0.350 0.250 0.170 0.110 0.054 0.022