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Design & installation Guide For McQuay MDS Multi System
4.3 Refrigerant piping design and installation
4.3.1 Refrigerant piping design ( including selection of refnet joint )
■ Capacity combination
The indoor units & outdoor units should have a relationship as follows:
■ Refrigerant piping limit
Note: the equivalent length is calculated as follows:
One refnet joint equals to 0.5m, one distributor kit equals to 1.0m. The above
table is based on the 8/10HP unit.
50% ≤
∑ indoor units' cap
∑ outdoor units' cap
≤130%
Note:We strongly recommend that the capacity modulation equals to 100%.
Allowable value piping section
Actual length
≤250
L1+L2+L3+L4+L5+L6+
a+b+……i
Piping
Max. length(m)
Actual length ≤100m
L1+L3+L4+L5+L6+i
Equivalent length ≤ 125m
The length from the first branch to the remotest unit L(m) ≤40m L3+L4+L5+L6+i
Height between indoor
Outdoor unit is above ≤50m -
Height
unit and outdoor unit
Indoor unit is above ≤40m -
Height between indoor unit and outdoor unit ≤15m -
Diameter of
the piping
Charge:D1=Φ28.6 D3= Φ12.7 Charge:D2=Φ19 D4=Φ9.5
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