Rheem W2W Series, Owner'S Manual And Installation Instructions

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HEAT PUMP AND TANK ASSEMBLY
33
manifold system and must be sized to accommodate the total flow of all the
primary pumps running simultaneously.
Refer to table below for minimum (ID) pipe sizing.
The designed primary pump per 15kW model is Grundfos CM3-2 and per 35kW
model is CM10-1. Refer to installation manuals supplied with pumps. If another
pump has been supplied, consult Rheem before continuing with the installation.
Header pipe sizing is based on one pump per
heat pump with a total length of
20m of primary flow and return piping and 20 x 90
o
bends, excluding Equa-flow
manifolds on storage tanks and heat pumps at 1.2m/sec velocity, with a cold side
water entering temperature not exceeding 35
o
C. If this specification is exceeded
consult Rheem before continuing with the installation.
Multiple heat pumps
MUST be installed using Equa-Flow® principles to ensure
the demand on each heat pump (or storage tank) in the bank is the same as any
other. To achieve this, the following is necessary:
1. The inlet manifolds must be designed to balance the flow to each heat
pump i.e. each branch line must be the same diameter and length.
2. The outlet manifolds must be designed to balance the flow from each heat
pump i.e. each branch line must be the same diameter and length.
3. The first heat pump in must be the last heat pump out.
Note: Inlet and outlet water isolation valves MUST be installed at each heat pump
to enable each heat pump to be individually isolated for servicing. The inlet
isolation valves
MUST be installed before the pumps to also enable the pumps
to be isolated for servicing.
W2W HP 35kW
Hot Side
No. of Heat Pumps
in Parallel
1 2 3 4
Pump Grundfos CM10-1
Branch Size (mm) 50
Header Size (mm) 50 80 100 100
Cold Side
No. of Heat Pumps
in Parallel
1 2 3 4
Pump Grundfos CM10-1
Branch Size (mm) 50
Header Size (mm) 50 80 100 100
W2W HP 15kW
Hot Side
No. of Heat Pumps in
Parallel
1 2 3 4
Pump Grundfos CM3-2
Branch Size (mm) 40
Header Size (mm) 40 50 65 80
Cold Side
No. of Heat Pumps in
Parallel
1 2 3 4
Pump Grundfos CM3-2
Branch Size (mm) 40
Header Size (mm) 40 50 65 80