Gas Valve Replacement Instructions

TOOLS REQUIRED FOR INSTALLATION

• Combustion Analyzer with the capability to read Carbon

Dioxide (CO

) and Carbon Monoxide (CO) emissions

(Testo 325-M or equivalent)

• Pressure Manometer capable of reading up to 15 inches of

water (Dwyer 1227 Series or equivalent)

• Flat Blade Screwdriver

• #2 Phillips Screwdriver

• T20 Torx Driver

• 3 mm Hex Key (PF-50 & PF-110)

• 10 inch (250 mm) Adjustable Wrench

STEP 1 – TURN OFF POWER & GAS

• Turn off all power to the appliance using the boiler

service switch. Note that the convenience outlet is still

powered when this switch is off. See Figure 1.

• Turn off gas supply to the boiler using the gas shut off

cock located at the top of the boiler. See Figure 1.

• Be sure that the boiler drain valve is closed and a hose

cap is installed to prevent accidental water leakage

onto the boiler.

STEP 2 – DISCONNECT GAS VALVE

POWER PLUG

• Using #2 screwdriver, remove the connector screw

from the valve. See Figure 2.

• Remove connector from gas valve.

Installation of the primary gas safety shutoff valve is to be performed by qualified service personnel in strict

accordance with these instructions and all applicable codes and requirements of the authority having jurisdiction.

The qualified service person is responsible for proper installation of this kit. The installation is not complete until

the operation of the appliance is checked using a combustion analyzer as specified in these instructions.

WARNING

Figure 1

The following instructions must be followed

correctly. Failure to do so may result in death or

serious injury.

WARNING

PUREFIRE

Gas Valve Replacement Instructions

Stop! Read these instructions or the warranty on the appliance will be void!

If the information in these instructions is not followed exactly, a fire, an explosion or production of carbon

dioxide may result causing severe personal injury, death or major property damage.

WARNING

Figure 2

Service Switch

Gas Shut Off Cock

PAGE 1
PUREFIRE® Gas Valve Replacement Instructions WARNING Installation of the primary gas safety shutoff valve is to be performed by qualified service personnel in strict accordance with these instructions and all applicable codes and requirements of the authority having jurisdiction. The qualified service person is responsible for proper installation of this kit. The installation is not complete until the operation of the appliance is checked using a combustion analyzer as specified in these instructions.
PAGE 2
PUREFIRE 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.
PAGE 3
PUREFIRE GAS VALVE REPLACEMENT INSTRUCTIONS • If there is a significant drop in pressure (more than 1" in a 5 second span), tighten the gas inlet fittings. • Adjust the throttle screw to as shown to Figure 8 and Table 2 to dial in the acceptable range. • When no leaks are detected, remove the manometer and tighten the screw inside the inlet gas pressure port as shown in Figure 7. • Change input rate to low power. Modulation will drop to 1%. • Open boiler gas shut off cock.