Section 4. Maintenance; Care And Maintenance; Checking The Gas Control Valve - Pentair MASTERTEMP 200HD Installation And User Manual

Maintenance Instructions

CARE AND MAINTENANCE

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 flow of ventilating air or burner
exhaust.
2. Keep the area in and around the heater clear and free from combustible materials, gasoline and other flammable 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 fittings 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 qualified service technician if
you suspect that the burner may require maintenance.

CHECKING THE GAS CONTROL VALVE

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.
To
Air Flow
Switch
Valve
Adjustment
Screw
Figure 7a.
Figure 45.
P/N 474131 Rev. M 8/2020
WARNING
C
onnection
for Service
To Air Flow
Switch
To
Gas
To Gas
Valve
Valve Vent
Vent
To Low Side
of Differential
Pressure Gauge
Pressure

Section 4. Maintenance

To High Side
of Differential
Pressure Gauge
Tap
MasterTemp Pool and Spa Heater
55
C
onnection
for Test
Vent