Rinnai 22
Commercial Heat Pump OIM
Inlet and outlet water isolation valves should be installed at each heat pump to enable each heat pump to be
individually isolated for servicing. It is strongly recommend to install a suitable strainer in the inlet pipe for each
heat pump.
Minimum Pipe Sizing
CHP020
CHP040
No. of Heat Pumps in Parallel
1
2
3
4
No. of Heat Pumps in Parallel
1
2
3
4
Pump
Grundfos CM 3-2
Pump
Grundfos CM 10-1
Branch Size (mm)
32
Branch Size (mm)
50
Header Size (mm)
(Primary Piping)
40
50
65
80
Header Size (mm)
(Primary Piping)
50
80
100 100
EQUAL FLOW PRINCIPLE
Multiple heat pumps
MUST
be installed using equal flow principle to ensure the demand on each heat pump (or
storage tank) is the same as any other. To achieve this, the following is necessary:
•
The inlet and outlet manifolds shall be designed to balance the flow to each heat pump (i.e. each branch line
must be the same diameter and length).
•
The manifolds shall be designed to ensure the flow; the first heat pump in shall be the last heat pump out.
Storage tanks
MUST
be manifolded using equal flow principle to ensure even distribution of the stored energy. To
achieve this, the following is necessary:
•
The cold water, primary flow and hot water manifolds shall be designed to balance the flow for each storage
tank (i.e. each branch line shall be the same diameter and length).
•
The manifolds shall be designed to ensure the flow: the first storage tank in shall be the last storage tank out.
INSTALLATION
