Operating instructions

12
Pre-Operation Checks
Gas
Valve
Proper Gas Valve Mounting Location
1. Close the manual gas valve external to the unit.
2. Turn off the electrical power supply to the unit.
3. Set the room thermostat to its lowest possible setting.
4. Remove the heat exchanger door on the side of the unit by
removing screws.
5. This unit is equipped with an ignition device which
automatically lights the main burner. DO NOT try to light
burner by any other method.
6. Move or rotate (depending on your gas valve) the gas control
valve switch to the OFF position. Do not force.
7. Wait five minutes to clear out any gas.
8. Smell for gas, including near the ground. This is important
because some types of gas are heavier than air. If you have
waited five minutes and you do smell gas, immediately follow
the warnings on page 2 of this manual. If having waited for
five minutes and no gas smell is noted, move or rotate the
gas control valve switch to the ON position.
9. Replace the heat exchanger door on the side of the unit.
10. Open the manual gas valve external to the unit.
11. Turn on the electrical power supply to the unit.
12. Set the thermostat to desired setting.
Gas Supply And Manifold Check
Gas supply pressure and manifold pressure with the burners
operating must be as specified on the rating plate.
Gas Inlet Pressure Check
Gas inlet pressure must be checked and adjusted in accordance
to the type of fuel being consumed.
O
F
F
ON
M
P
C
1
3
2
INLET
Pressure Regulator
Adjustment
(Under Cap Screw)
Inlet Pressure Tap
(Side of Valve)
Outlet (Manifold)
Pressure Tap
(Side of Valve)
Gas Valve
On/Off
Selector
Switch
OUTLET
White-Rodgers Model 36E22
OUTLET
INLET
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
Inlet Pressure Tap
(Side of Valve)
Outlet (Manifold)
Pressure Tap
White-Rodgers Model 36F22
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
INLET OUTLE
T
Inlet Pressure
Tap
Outlet Pressure
Tap
White-Rodgers 36G22
Honeywell
OFF
ON
OUTLET
INLET
Outlet (Manifold)
Pressure Tap
Pressure Regulator
Adjustment
(Under Cap Screw)
Inlet Pressure Tap
Gas Valve
On/Off
Control Knob
Honeywell Model VR8205
With Power And Gas Off:
Connect a water manometer or adequate gauge to the inlet
pressure tap of the gas valve.
Inlet gas pressure can also be measured by removing the cap
from the dripleg and installing a predrilled cap with a hose fitting.
Gas Line
Gas
Shutoff
Valve
Gas Line
To Furnace
Drip Leg Cap
With Fitting
Manometer Hose
Manometer
Open To
Atmosphere
Gauge Attachment to Inlet Pressure Tap