Raypak B0507 Owner's Manual And Installation Instructions page 16

CONNECTIONS – PLUMBING
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).
Model
UPS
Series
507 32-80N
538 32-80N
658
32-80N
768 32-80N
40-60/2B
868
32-80N
40-60/2B
972/992 40-60/2B
1142/1182 40-60/2B
1242/1292 40-60/2B
1362/1412 50-120FB
1662/1722 50-120FB
1852/1922
50-120FB
2004/2214 50-120FB
2404/2634 80-120FB
2804/3164 80-120FB
3304/3694 80-120FB
3804/4224
80-120FB
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.
"Water Flow Rate and Pressure Drop"
Refer to the
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"
Where the water flow rate exceeds the maximum shown in the
Flow Rate and Pressure Drop"
through the water heater (refer to diagram above).
For pump sizing where the water heating system incorporates Rheem storage tanks, refer to the
and Pipe Size" table on page 16.
PUMP SELECTION AND PIPE SIZE
Pump
Speed TP Series
3
3
3
3 50-30/4FB
2
3
1 50-30/4FB
3 50-60/FB
3 50-60/FB
3 50-60/FB
1 50-60/FB
3 80-120FB
3 80-120FB
3 80-120FB
2 80-120FB
3 80-120FB
3 80-120FB
3 80-120FB
table.
table, a bypass with a balancing valve must be installed to reduce the water flow
Branch Size
inches mm
1¼ 32
1¼ 32
1½ 40
2 50
1½ 40
2½ 65
2 50
2 50
2½ 65
2½ 65
2½ 65
2½ 65
2½ 65
3 80
3 80
3 80
4 100
4 100
table on page 17 for
"Water
16
Minimum Manifold Header
Size Required (mm)
1 2 3
Unit Units Units
50 65 65
50 65 80
50 65 80
80 100 100
50 80 80
100 125 150
65 80 100
65 80 100
80 100 100
80 100 100
80 100 100
80 100 125
80 100 125
100 125 125
100 125 150
100 150 150
125 150 150
125 150 150
"Pump Selection
4
Units
65
80
80
100
80
150
100
100
100
100
100
125
125
125
150
150
150
150