Raypak 910500, Owner'S Manual And Installation Instructions

Page: 29 / 108

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
o
C
Table 9 on page 29 provides minimum pipe and pump sizes for typical water heating installations up to
65
o
C at the optimum temperature rise for these applications (20
o
K).
PUMP SELECTION APPLICATIONS ABOVE 65
o
C
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.
Table 10 on page 39 provides minimum pipe
and pump sizes for primary circuit in mechanical heating and domestic hot water applications over
65
o
C at the optimum temperature rise for these applications (15
o
K).
MVB Pipe Size and Pump and Pipe Selection Chart –
DHW and Hydronic Applications up to 65
o
C
(20 degree rise)
MVB
Model
Pump
Model
Branch
Size
mm
Minimum Manifold Header Size (mm) / Pump Speed Setting
1 Unit 2 Units 3 Units 4 Units
pipe
dia
speed
pipe
dia
speed
pipe
dia
speed
pipe
dia
speed
mm mm mm mm
910500 UPS32-80N 50 50 3 65 3 80 3 100 3
910750 UPS32-80N 65 65 3 80 3 100 3 100 3
911000 Magna 1 40-120 65 65 PP1 100 PP1 100 CP1 125 PP1
911250 Magna 1 40-120 80 80 CC2 100 CC2 125 CC2 125 CC3
911500 Magna 1 40-120 80 80 CC3 100 CC3 125 CC3 150 CC3
911750 Magna 1 65-150 100 100 CC2 125 CC2 150 CC2 200 CC2
912000 Magna 1 65-150 100 100 PP2 125 PP2 150 PP2 200 PP2
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
o
C for a 20
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
C