W:\ELECTRICAL\INSTRUCT\FURNACE\FURNACE GENERAL INSTRUCTIONS 2011.DOC
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01/2014
SECOND PILOT SHUT OFF VALVE (2PSOV)
17.
Make sure all gas cocks ahead of equipment are open to allow gas flow to equipment and power
is provided to the control panel. Turn on the Exhauster but do not turn HEAT switch to start to
assure that there is no power to the pilot shut off solenoid valves so that they are closed
(1PSOV & 2PSOV).
18.
Make sure the manual test petcock (E) is closed.
19.
Remove the leak test tap plug (F) and connect 1/4" tube to the petcock.
20.
Close the downstream pilot gas cock located between the pilot shut off solenoid valves and
burner.
21.
Immerse the 1/4" tube vertically ½ inch into a jar of water.
22.
Depress and hold the VALVE TEST button located at the burner junction box to open the first
pilot shut off solenoid valve (1PSOV) and allow gas pressure to the second pilot shut off
solenoid valve (2PSOV).
23.
While holding VALVE TEST button in, slowly open the test petcock (E).
24.
Gas will bubble through the water and stop. If bubbles continue, the valve is leaking and must
be replaced. Do not continue to operate burner until valve is replaced.
25.
Release VALVE TEST button. Close the test petcock (E), remove the 1/4" tube and replace the
leak test tap plug (F).
26.
Open the pilot gas cock located between the pilot shut off solenoid valves and the burner.
SECOND SAFETY SHUT OFF VALVE (2SSOV)
27.
Turn on the Blower (Gas cocks open and exhauster still running from step 17) and turn the
HEAT
switch to “START”. System will purge and ignite pilot causing main safety shut off valve
(1SSOV) and secondary safety shut off valve (2SSOV) to open.
28.
Make sure the manual test petcock (G) is closed.
29.
Remove the leak test tap plug (H) and connect 1/4" tube to the petcock.
30.
Close the main gas cock located between the safety shut off solenoid valves and burner.
31.
Immerse the 1/4" tube vertically1/2 inch into a jar of water.
32.
Depress and hold VALVE TEST button located at burner junction box to cause secondary safety
shut off solenoid valve (2SSOV) to close. (NOTE: If customer requested vent valve is installed,
vent valve will also close at this point. Check to make sure vent valve closes and that no gas is
passing from vent valve outlet. To do this, the location of the outlet vent pipe must be found
where it exits the building.)
33.
While holding VALVE TEST button in, slowly open the test petcock (G).
34.
Gas will bubble through the water and stop. If bubbles continue, the valve is leaking and must
be replaced.
Turn HEAT switch to “OFF”. Do not continue to operate burner until valve is
replaced.
35.
Close the test petcock (G). Release test button. Remove the 1/4" tube and replace the leak test
tap plug (H).
36.
Open the main gas cock located between the safety shut off solenoid valves and burner.