30
MVB Pipe Size and Pump and Pipe Selection Chart
–
DHW and Hydronic Applications Between 65
o
C and 82
o
C (15 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
UPS32-80
50
50
3
80
3
100
3
100
3
910750
Magna 1 40-120
65
65
PP1
100
PP1
100
PP1
125
PP1
911000
Magna 1 40-120
80
80
PP1
100
CC2
125
PP1
150
PP1
911250
Magna 1 40-120
80
80
CC3
125
CC3
125
CC3
150
CC3
911500
Magna 1 65-150
100
100
CC2
125
PP2
150
PP2
200
CC2
911750
Magna 1 65-150
100
100
CC3
125
CC3
150
CC3
200
CP3
912000
Magna 1 65-150
100
100
CC3
125
CC3
150
CC3
200
CC3
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
o
C and 82
o
C
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 Flow Rate and Pressure Drop Table
MVB
Model
Temperature Rise (
o
C)
Min Flow
Max Flow
10
15
20
L/sec
dP
(kPa) L/sec
dP
(kPa)
L/sec
dP
(kPa)
L/sec
dP
(kPa)
dT
Deg C
L/sec
dP
(kPa)
dT
Deg C
910500
3.13
11.05
2.00
5.00
-
-
1.60
3.35
19.4
6.40
34.44
5.0
910750
4.62
25.15
3.00
10.80
2.26
7.10
2.11
5.79
21.7
6.40
42.06
7.2
911000
6.18
44.00
4.00
21.10
3.00
12.70
2.88
11.58
21.7
7.23
56.69
8.3
911250
7.23
56.70
5.00
35.60
3.77
25.80
3.58
19.81
21.7
7.23
67.67
10.6
911500
-
-
6.00
56.30
4.50
33.80
4.29
30.48
21.7
7.23
77.72
12.8
911750
-
-
7.00
82.90
5.28
44.70
4.99
42.67
21.7
7.23
82.91
15.0
912000
-
-
-
-
5.70
60.40
5.70
60.35
21.7
7.42
97.54
16.7
Table 11: Water Heater Flow Rate and Pressure Drop
