Gas Valve Replacement Instructions

STEP 3 – DISCONNECT GAS INLET

• PF-50 & PF-110

– Using a 3 mm hex key, remove (4) cap screws from

gas valve inlet flange. See Figure 3.

• PF-80 & PF-140

– Using a 10 inch adjustable wrench, disconnect the

compression nut from the inlet of the gas valve.

– Remove the adapter fitting from the valve.

STEP 4 – DISCONNECT GAS VALVE FROM

BLOWER

• Using a T20 Torx driver, remove the three screws ➁

holding the gas valve ➀ and swirl plate ➂ to the

blower assembly.

• The PF-140 valve includes six washers ➃.

• Inspect the valve for signs of electrical damage or

unusual wear.

STEP 5 – INSTALL REPLACEMENT GAS

VALVE

• Assuring that top of the gas valve is facing toward the

front of the boiler, attach the valve and swirl plate to

the blower assembly. See Figure 6.

• PF-50 & PF-110

– Attach the 90° inlet flange on the inlet to the valve.

• PF-80 & PF-140

– Attach the 1/2 NPT pipe fitting to the inlet of the

valve using thread sealant appropriate for gas

piping.

– Connect compression fitting to the adapter from flex

hose.

STEP 6 – GAS SYSTEM LEAK TEST

• Loosen the screw inside the inlet gas pressure port.

See Figure 7.

• Connect a manometer to the port.

• Open the boiler gas shutoff valve and check the

pressure at the manometer.

• Close the boiler gas shutoff valve while monitoring the

manometer.

Figure 4

Figure 3

Figure 5

Figure 6

PUREFIRE GAS VALVE REPLACEMENT INSTRUCTIONS