GMV DC Inverter VRF
30
included IDUs is more than 4 sets. Please refer to the above table.
Refrigerant charging amount B for 72kBtu/h module is 4.0kg (8.8pounds).
Refrigerant charging amount B for 120 kBtu/h module is 4.0kg (8.8pounds).
Refrigerant charging amount B for 120 kBtu/h module is 4.0kg (8.8pounds).
So, Σ Refrigerant charging amount B of every module=4.0+4.0+4.0=12kg (8.8+8.8+8.8
=26.4pounds).
Suppose the Pipeline charging amount A=Σ Liquid pipe length × refrigerant charging amount
of every 1m (or 1in.) liquid pipe=25kg (55.1 pounds)
Total refrigerant charging amount R=25+12=37kg (55.1+26.4=81.5pounds).
For example 2:
Outdoor unit is a 72kBtu/h module and the indoor unit is a 72kBtu/h fresh air unit. The quantity
(B) of refrigerant added to this module is 0kg (0pounds).
So, ΣB (Quantity of refrigerant added to each module) = 0kg (0pounds).
Suppose that A (Quantity of refrigerant added to connection pipe) = ∑ Length of liquid pipe x
Quantity of refrigerant added to liquid pipe per meter) = 5kg (11pounds).
R (Quantity of added refrigerant in total) = 5+0=5kg (11+0=11pounds).
Modular combination of outdoor unit subjects to combinations that is currently available.
After confirming that there is no leakage from the system, when the compressor is not in
operation, charge additional R410A with specified amount to the unit through the filling opening of
the liquid pipe valve of the outdoor unit. If required additional refrigerant cannot be quickly filled for
increase of pressure in the pipe, set the unit at cooling startup and then fill the refrigerant from gas
valve of outdoor unit. If ambient temperature is low, the unit can’t be set to cooling mode but
heating mode.
4.5.3 Precautions on Refrigerant Leakage
(1) Personnel related to air conditioning engineering design and installation operators must
abide by the safety requirement for preventing refrigerant leakage specified in local laws
and regulations.
(2) The units adopt the R410A refrigerant, which is nonflammable and nontoxic. However,
the space for refrigerant leakage must be sufficient to ensure that the refrigerant
concentration does not exceed that specified in the safety requirement; otherwise, people
involved can be stifled by the refrigerant. For example the maximum allowed
concentration level of refrigerant to a humanly space for R410A according to the
appropriate European Standard is limited to 0.44 kg/m
3
.
The maximum amount of refrigerant (kg) in the system = the volume of the room (m
3
) ×the
maximum allowed concentration level of refrigerant (kg/m
3
).
Total amount of refrigerant (kg) in the system = Total additional charging amount (kg) +
Amount of refrigerant (kg) which is charged before leaving the factory (for the system consisting of
multiple modules in parallel, the accumulative charge quantity of modules before leaving the
factory is used).
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