DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONSPage 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
ΔT = 15°F ΔT = 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
ΔT = 20°F ΔT = 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
ΔT = 25°F ΔT = 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
ΔT = 30°F ΔT = 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
ΔT = 35°F ΔT = 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.
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