Raypak 910500 Owner's Manual And Installation Instructions page 29

PIPE SIZING AND PUMP SELECTION
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.
PUMP SELECTION APPLICATIONS UP TO 65
Table 9 on page 29 provides minimum pipe and pump sizes for typical water heating installations up to
o
65 C at the optimum temperature rise for these applications (20
PUMP SELECTION APPLICATIONS ABOVE 65
In mechanical heating applications, the MVB is designed to operate on a primary flow and return
circuit serving the main system flow and return circuit.
and pump sizes for primary circuit in mechanical heating and domestic hot water applications over
o
65 C at the optimum temperature rise for these applications (15
MVB Pump
Model Model
910500 UPS32-80N
910750 UPS32-80N
911000 Magna 1 40-120
911250 Magna 1 40-120
911500 Magna 1 40-120
911750 Magna 1 65-150
912000 Magna 1 65-150
Note: Manifold header sizes are minimum requirements for water heater performance.
Pipe and pump sizing is for primary circuits in DHW and hydronic applications up to 71
degree rise.
Header sizing is based on a total length of 20m of primary flow and return piping and 20 bends,
excluding equa-flow manifolds on storage tanks and MVBs, at 1.2m/sec velocity in copper pipe.
Magna 1 pumps have 3 speed control modes. PP = Proportional Pressure, CP = Constant Pressure, CC =
Constant Curve. UPS pumps have 3 fixed speed control settings. The appropriate speed setting must be
used to ensure correct operation
Table 9: Pump and Pipe Sizing for Water Heating Applications up to 65
o
MVB Pipe Size and Pump and Pipe Selection Chart –
DHW and Hydronic Applications up to 65
(20 degree rise)
Minimum Manifold Header Size (mm) / Pump Speed Setting
Branch
1 Unit
Size
pipe
speed
mm
dia
mm
50 50
65 65
65 65 PP1
80 80 CC2
80 80 CC3
100 100 CC2
100 100 PP2
C
o
K).
C
o
Table 10 on page 39 provides minimum pipe
o
K).
2 Units
pipe
speed
dia
mm
3 65 3
3 80 3
100 PP1
100 CC2
100 CC3
125 CC2
125 PP2
29
o
C
3 Units 4 Units
pipe pipe
speed
dia dia
mm mm
80 3 100
100 3 100
100 CP1 125
125 CC2 125
125 CC3 150
150 CC2 200
150 PP2 200
o
C for a 20
o
C
speed
3
3
PP1
CC3
CC3
CC2
PP2