P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
55
Maintenance Instructions
Section 4. Maintenance
CARE AND MAINTENANCE
WARNING
Risk of fire or explosion from flammable vapors. Do not store gasoline, cleaning fluids, varnishes, paints, or other volatile
flammable liquids near heater or in the same room with heater.
The following maintenance is recommended every six months and at the start of every swimming season:
1. Inspect the heater panels and venting system to make sure that there are no obstructions to the ow of ventilating air or burner
exhaust.
2. Keep the area in and around the heater clear and free from combustible materials, gasoline and other ammable vapors and
corrosive liquids.
3. If applicable, test the operation of the pressure relief valve by lifting the valve lever. (See below for “PRESSURE RELIEF
VALVE” (page 56) instructions.)
4. Test for proper operation of the pressure switch. (See “WATER PRESSURE SWITCH” (page 42) for testing instructions.)
5. Check pipe and ttings for cracks or breaks. The combustion air blower is permanently lubricated, and does not require
periodic lubrication. The burner does not require maintenance or adjustment by the user. Call a qualied service technician if
you suspect that the burner may require maintenance.
To
Air Flow
Switch
To
Gas
Valve
Vent
To Air Flow
Switch
Vent
To High Side
of Differential
Pressure Gauge
To Low Side
of Differential
Pressure Gauge
To Gas
Valve Vent
Pressure
Ta p
Figure 7a.
Connection
for Service
Connection
for Test
Valve
Adjustment
Screw
IMPORTANT NOTICE: This heater is equipped with a combination gas valve that incorporates dual shut-off valves and a negative-
pressure regulator. which is factory set with a manifold pressure of 11 Pa ± 5 Pa below the reference pressure at the blower mixer
inlet,. If this control valve is replaced, it must be replaced with an identical control, and a gas valve “VENT” tap must be connected to
the end cap air orifice as shown in Figure 45.
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. CAUTION: The use of Flexible Connectors (FLEX) is NOT recom-
mended unless they are properly sized according to the supplier recommendations for the heater rating.
CHECKING THE GAS CONTROL VALVE
Figure 45.
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