DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONS
Page 14
Relief Valve
Pipe the discharge of the pressure relief valve to prevent
scalding in the event of a discharge, see Figure 10. The
discharge piping must be sized the same as the pressure
relief valve outlet and installed to allow complete drainage
of both the relief valve and the discharge piping.
Figure 10 - Relief Valve Piping
WARNING: Never install any type of valve
between the boiler/water heater and the relief
valve or an explosion causing extensive
property damage, severe personal injury or
death may occur!
Flow Switch
The fl ow switch supplied with the boiler/water heater must
be wired to the terminal strip in the control panel to
prevent the boiler from fi ring unless there’s adequate
water fl ow through the unit. The fl ow switch must be
installed in the supply piping adjacent to the boiler outlet
connection.
CAUTION: Failure to properly install the fl ow switch
may result in damage to the boiler/water heater heat
exchanger voiding the warranty!
Table 7 - Temperature Rise Table
Δ
T = 15°F
Δ
T = 8.3°C
Model
Flow Rate
Pres. Drop
Flow Rate
Pres. Drop
Number
GPM Ft
L/s kPa
300
34.0
0.22
2.1
0.6
400
45.4
0.49
2.9
1.5
600
68.1
1.30
4.3
3.8
750
85.1
2.35
5.4
6.9
900
102.1
3.84
6.4
11.3
1050
119.1*
6.23
7.5
18.4
Δ
T = 20°F
Δ
T = 11.1°C
Model
Flow Rate
Pres. Drop
Flow Rate
Pres. Drop
Number
GPM Ft
L/s kPa
300
25.5*
0.13
1.6
0.4
400
34.0
0.29
2.1
0.9
600
51.1
0.76
3.2
2.3
750
63.8
1.38
4.0
4.1
900
76.6
2.25
4.8
6.6
1050
89.4
3.66
5.6
10.8
1350
114.9*
7.17
7.2
21.1
Δ
T = 25°F
Δ
T = 13.9°C
Model
Flow Rate
Pres. Drop
Flow Rate
Pres. Drop
Number
GPM Ft
L/s kPa
300
20.4*
0.09
1.3
0.3
400
27.2*
0.19
1.7
0.6
600
40.8
0.51
2.6
1.5
750
51.1
0.91
3.2
2.7
900
61.3
1.49
3.9
4.4
1050
71.5
2.42
4.5
7.1
1350
91.9
4.74
5.8
14.0
1500
102.1
6.31
6.4
18.6
Δ
T = 30°F
Δ
T = 16.7°C
Model
Flow Rate
Pres. Drop
Flow Rate
Pres. Drop
Number
GPM Ft
L/s kPa
600
34.0
0.36
2.1
1.1
750
42.6
0.65
2.7
1.9
900
51.1
1.06
3.2
3.1
1050
59.6
1.73
3.8
5.1
1350
76.6
3.38
4.8
10.0
1500
85.1
4.50
5.4
13.3
1950
110.6*
9.20
7.0
27.1
2100
119.1*
11.27
7.5
33.2
Δ
T = 35°F
Δ
T = 19.4°C
Model
Flow Rate
Pres. Drop
Flow Rate
Pres. Drop
Number
GPM Ft
L/s kPa
750
36.5
0.49
2.3
1.4
900
43.8
0.80
2.8
2.4
1050
51.1
1.30
3.2
3.8
1350
65.6
2.54
4.1
7.5
1500
72.9
3.38
4.6
10.0
1950
94.8
6.91
6.0
20.4
2100
102.1
8.47
6.4
25.0
*Flow exceeds recommended maximum use a greater temperature
rise or consult manufacturer. Cupro-nickel heat exchanger should be
considered.