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6
Water circulation and plumbing notes
6.1
The system is designed to operate with a maximum output temperature of 190°F or lower and a
temperature rise across the unit of 20°F or lower.
Please refer to Table 4 for the minimum flow rate versus the capacity of the boiler.
6.2
In order to ensure an adequate flow rate :
6.21
Pressure loss (referred as "Head") caused by water friction in the system should not exceed the
capacity of the pump.
6.22
Please refer to Table 5 below to find the copper pipe diameter (type L) recommended to
accommodate the water flow found in Table 4 above.
6.23
Elbows and valves will greatly add to the head loss in the system. An appropriate water flow rate
must be maintained to avoid tripping of the temperature limiter. Pipes with diameters larger than
specified in Table 5 will not help to increase water flow.
6.24
Head loss through the boiler tank is negligable and should not affect calculations of flow rates.
6.3
The installation must have a drain valve, an expansion tank, maintenance valves and an automatic
pressure reducing fill valve set at 15 PSI (104 kPA). A "T" fitting (1-1/4" NPT) must be installed at the
supply outlet of the unit. This "T" must be equipped with a reducing bushing 1-1/4" to 3/4" NPT, facing
upwards, to accept a 3/4" NPT pressure relief valve. This safety valve must be installed vertically. Except
for the pressure relief valve, the above plumbing supplies are not supplied with the unit. Please refer to
illustrations A, B and C at the end of this manual.
Table 4
Minimum Water Flow Rate vs Capacity
Capacity (kW)
US Gallons / min
3
5
6
8
9
10
11
12
15
18
20
23
27
30
35
40
Table 5
Maximum Flow Rate @ 15 psi
Maximum Flow Rate
US Gallons / min
4.3
10.1
17.3
Page 4
1.1
1.8
2.0
2.8
3.1
3.5
3.9
4.2
5.3
6.2
7.0
8.0
8.8
10.4
12.2
13.9
Pipe Diameter
(Type L Copper)
3/4"
1"
1-1/4"
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