MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide P/N 475114 Rev. F 8/2020
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TESTING GAS LEAKS AND GAS PRESSURE
THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE REGULATOR.
Before operating the heater, the heater and its gas connections must be leak tested. Do NOT use an open ame to test
for leaks. Test all gas connections for leaks with soapy water.
The gas valve must be completely disconnected from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 6.0 kPa (60 mbar).
TESTING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE
WARNING
Risk of fire and explosion. Alteration, service, or maintenance of the Combination Gas Control Valve can lead to fire or explosion,
causing loss of life, personal injury, and/or property damage. DO NOT ATTEMPT TO ADJUST THE GAS CONTROL VALVE.
Figure 10.
1. Shut off the gas supply to the heater.
2. Loosen the small screw inside the pressure tap as shown in Figure 10.
3. Connect the manometer hose.
4. Open the gas supply to the heater.
5. Turn on the heater.
6. Take the gas pressure reading.
7. Turn off the heater.
8. Shut off the gas supply to the heater.
9. Disconnect the manometer hose.
10. Tighten the small screw inside the pressure tap.
Description Type
Gas Supply
Pressure
Natural Gas
2H; 2E+; 2N; 2Es; 2Ei; 2ELL
(G20/G25)
20-25 mbar
Propane Gas
3P (G31) 37 mbar
NOTE: The minimum value approved for input adjustment. Do not
exceed the maximum supply pressure.
All readings must be taken while heater is operating. Any adjustments or
readings made while heater is off will result in performance problems.
INLET GAS PRESSURE REQUIREMENTS
CAUTION! This appliance is equipped with an unconventional gas control valve that is factory set with a manifold
pressure of 1.1 ± 0.5 mbar. Installation or service must be performed by a qualied installer, service agency, or the
gas supplier. If this control valve is replaced, it must be replaced with an identical control. The combination gas valve
incorporates dual shut-off valves and a negative-pressure regulator. For proper operation, the regulated pressure at the
outlet manifold of the valve must be 1.1 ± 0.5 mbar below the reference pressure at the blower mixer inlet, and the gas
valve ‘VENT’ tap must be connected to the end cap air orice as shown in Figure 17 (page 15). DO NOT attempt to
adjust the gas input by adjusting the regulator setting. The correct gas regulator setting is required to maintain
proper combustion and must NOT be altered.
Lightly loosen the
small screw inside the pressure tap,
and attach/connect the manometer hose.
Table 3.
Section 1. Installation
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