Raypak B0507, Owner'S Manual And Installation Instructions

Page: 16 / 57

CONNECTIONS
– PLUMBING
16
PIPE SIZES
The pipe sizing for water heating and mechanical heating systems should be carried out by persons competent to
do so, choosing the most suitable pipe size for each individual application. Reference to the technical specifications
of the water heater and local regulatory authority requirements must be made.
The table below provides indicative pipe and pump sizes between Raypak unit/s and storage tank/s for typical
water heating installations using storage tanks (DHW).
PUMP SELECTION AND PIPE SIZE
Model Pump Branch Size
Minimum Manifold Header
Size Required (mm)
UPS
Series
Speed TP Series inches mm
1
Unit
2
Units
3
Units
4
Units
507 32-80N 3 1¼ 32 50 65 65 65
538 32-80N 3 1¼ 32 50 65 80 80
658 32-80N 3 1½ 40 50 65 80 80
768 32-80N 3 50-30/4FB 2 50 80 100 100 100
40-60/2B 2 1½ 40 50 80 80 80
868 32-80N 3 2½ 65 100 125 150 150
40-60/2B 1 50-30/4FB 2 50 65 80 100 100
972/992 40-60/2B 3 50-60/FB 2 50 65 80 100 100
1142/1182 40-60/2B 3 50-60/FB 2½ 65 80 100 100 100
1242/1292 40-60/2B 3 50-60/FB 2½ 65 80 100 100 100
1362/1412 50-120FB 1 50-60/FB 2½ 65 80 100 100 100
1662/1722 50-120FB 3 80-120FB 2½ 65 80 100 125 125
1852/1922 50-120FB 3 80-120FB 2½ 65 80 100 125 125
2004/2214 50-120FB 3 80-120FB 3 80 100 125 125 125
2404/2634 80-120FB 2 80-120FB 3 80 100 125 150 150
2804/3164
80-120FB 3 80-120FB 3 80 100 150 150 150
3304/3694 80-120FB 3 80-120FB 4 100 125 150 150 150
3804/4224
80-120FB 3 80-120FB 4 100 125 150 150 150
PUMP SELECTION
For the most efficient operation of the water heating system the
circulating pump must be sized correctly.
The pump should be installed on the inlet to the water heater especially
where the system water pressure is low.
Refer to the
“Water Flow Rate and Pressure Drop”
table on page 17 for
the minimum and maximum flow rates for each model to determine the
pressure loss through the water heater for the required temperature rise
and add this to the other system pressure losses when sizing the pump.
Note: The flow rate must never be below the minimum stated in the
“Water Flow Rate and Pressure Drop”
table.
Where the water flow rate exceeds the maximum shown in the
“Water
Flow Rate and Pressure Drop”
table, a bypass with a balancing valve must be installed to reduce the water flow
through the water heater (refer to diagram above).
For pump sizing where the water heating system incorporates Rheem storage tanks, refer to the
“Pump Selection
and Pipe Size
”
table on page 16 .