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DHW and Hydronic Applications Between 65
MVB
Pump
Model
Model
910500
UPS32-80
910750
Magna 1 40-120
911000
Magna 1 40-120
911250
Magna 1 40-120
911500
Magna 1 65-150
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 between 65
for a 15 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 10: Pump and Pipe Sizing for Mechanical Heating Applications
For the most efficient operation of the water heating system the circulating pump must be sized and
speed set correctly.
The pump should be installed on the inlet to the water heater especially where the system water
pressure is low.
Refer to Table 11 on page 41 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 Table 11.
MVB
10
Model
dP
L/sec
(kPa)
910500
3.13
11.05
910750
4.62
25.15
911000
6.18
44.00
911250
7.23
56.70
911500
-
-
911750
-
-
912000
-
-
MVB Pipe Size and Pump and Pipe Selection Chart –
Minimum Manifold Header Size (mm) / Pump Speed Setting
Branch
1 Unit
Size
pipe
mm
dia
mm
50
50
65
65
80
80
80
80
100
100
100
100
100
100
MVB Flow Rate and Pressure Drop Table
o
Temperature Rise (
C)
15
dP
L/sec
(kPa)
L/sec
2.00
5.00
-
3.00
10.80
2.26
4.00
21.10
3.00
5.00
35.60
3.77
6.00
56.30
4.50
7.00
82.90
5.28
-
-
5.70
Table 11: Water Heater Flow Rate and Pressure Drop
o
C and 82
2 Units
pipe
speed
speed
dia
mm
3
80
3
PP1
100
PP1
PP1
100
CC2
CC3
125
CC3
CC2
125
PP2
CC3
125
CC3
CC3
125
CC3
Min Flow
20
dP
dP
(kPa)
L/sec
(kPa)
-
1.60
3.35
7.10
2.11
5.79
12.70
2.88
11.58
25.80
3.58
19.81
33.80
4.29
30.48
44.70
4.99
42.67
60.40
5.70
60.35
30
o
C (15 degree rise)
3 Units
pipe
pipe
speed
dia
dia
mm
mm
100
3
100
100
PP1
125
125
PP1
150
125
CC3
150
150
PP2
200
150
CC3
200
150
CC3
200
o
C and 82
Max Flow
dT
dP
Deg C
L/sec
(kPa)
19.4
6.40
34.44
21.7
6.40
42.06
21.7
7.23
56.69
21.7
7.23
67.67
21.7
7.23
77.72
21.7
7.23
82.91
21.7
7.42
97.54
4 Units
speed
3
PP1
PP1
CC3
CC2
CP3
CC3
o
C
dT
Deg C
5.0
7.2
8.3
10.6
12.8
15.0
16.7
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