Type 36C74
Combination Gas Valve
WHITE-RODGERS
INSTALLATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY
AND/OR PROPERTY DAMAGE.
DESCRIPTION
The 36C74 Gas Valve is for use on systems providing
automatic ignition of the pilot and/or main burners and
ON
incorporates the following features: pilot/redundant sole-
O F F
noid valve, main valve, integral pressure regulator and
male spade terminals for point-to-point wiring.
This gas valve is also equipped with a step-opening
feature to provide for quieter main burner ignition. The
valve opens partially until main burner flame is estab-
lished, then the valve opens to full operating pressure.
SPECIFICATIONS
Electrical Rating:
PIPE SIZES/CAPACITIES
24 VAC (30 Volts max. Voltage), 60 Hz.
Capacity (BTU/hr) at
1" pressure drop across valve
Types of Gases: Natural or LP Gas
Pressure Rating: 14” W.C. (1⁄2 PSI)
Nat. Gas
LP Gas
Pipe Size (1000 BTU/cu. ft., (2500 BTU/cu. ft.,
Ambient Temperature: -40° to 175°F (-40° to 79°C)
64 Sp. Gr.)
1.53 Sp. Gr.)
(inches)
1
2" x 3/8
2" x 1/2
2" x 3/4
4" x 3/4
"
"
"
"
100,000
230,000
230,000
280,000
162,000
372,600
372,600
453,600
Regulator Adjustment Range:
Natural Gas: 2.5” to 5.0” W.C. (Full flow)
LP Gas: 7.5” to 12.0” W.C. (Full flow)
(Step pressure not adjustable)
/
/
/
/
1
1
3
Upright, 90° from upright or vertical
INLET BOSS
UPRIGHT
UP OR DOWN
CONTENTS
LEFT OR RIGHT
Description ......................................................... 1
Specifications ..................................................... 1
Precautions ........................................................ 2
Installation .......................................................... 3
Main Piping Connection
O F F
ON
Pilot Gas Connection
System Wiring
Adjustment ......................................................... 4
Pilot Flame Adjustment
NOTE: Control shown may not be identical
to replacement control.
Pressure Regulator Adjustment
Pilot Lighting Instructions and Precautions ........ 5
Figure 1. Mounting Positions
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-5868A
Printed in U.S.A.
Replaces 37-5153A
9732
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INSTALLATION
MAIN PIPING CONNECTIONS
Drop
NOTE
Horizontal
All piping must comply with local codes, ordinances,
and/or national fuel gas codes.
1. Turn off electrical power to the system at the fuse box
or circuit breaker. Also turn off the main gas supply.
2. If replacing an existing valve, disconnect all plumbing
and electrical connections from the old control.
Gas Valve
NOTE:
Always Include
A Drip Leg In Piping
Riser
3 in.
minimum
3. The valve may be installed in any position except
upside down. The arrow on the bottom plate indi-
cates the direction of gas flow through the valve.
Drop
Tubing Gas
Supply
Gas Valve
Riser
4. You should use new pipe that is properly chamfered,
reamed, and free of burrs and chips. If you are using
old pipe, be sure it is clean and free of rust, scale,
burrs, chips, and old pipe joint compound.
Horizontal
5. Apply pipe joint compound (pipe dope) or teflon tape
that is approved for all gases, only to the male
threads of the pipe joints. DO NOT apply com-
pound or teflon tape to the first two threads (see fig. 2
for typical piping connections).
Gas Valve
3 in.
minimum
3 in.
minimum
Piped Gas
Supply
Piped Gas
Supply
6. If you are using a vise or open-end wrench to hold the
valve while installing piping, do not tighten exces-
sively, as this may damage the valve.
Figure 2. Typical gas valve piping
7. See SYSTEM WIRING when making electrical con-
nections. After all gas and electrical connections are
completed, turn gas on and check for gas leaks with
leakdetectionsolutionorsoapsuds. Bubblesforming
indicate a leak. SHUT OFF GAS AND FIX ALL
LEAKS IMMEDIATELY.
PILOT GAS CONNECTION
The valve is shipped with the pilot outlet plugged. For
installations requiring pilot gas, remove the plug and use
the fitting packed separately with the control.
PRESS
Pilot Gas
Outlet
PILOT
Install fitting into pilot gas outlet (see fig. 3), turning until
finger-tight. Insert clean, deburred tubing all the way
through the fitting. While holding the tubing securely,
slowly tighten fitting until you feel a slight “give”. Tighten
the fitting an additional 11⁄2 turns.
TAP
Gas Outlet
Figure 3. Gas valve side view
3
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INSTALLATION (con’t)
SYSTEM WIRING
All wiring should be installed in accordance with local and
national electrical codes and ordinances.
NOTE
REFER TO AND FOLLOW THE APPLIANCE
MANUFACTURER’S WIRING DIAGRAM. REFER TO
FIG. 4 FOR TERMINAL IDENTIFICATION.
Check that the electrical power supply used agrees with
the voltage and frequency shown on the gas control.
Main Valve
1
2
Redundant
Valve Coil
(Pilot Valve)
3
4
Figure 4. Typical gas valve wiring
ADJUSTMENT
PILOT FLAME ADJUSTMENT
PRESSURE REGULATOR
ADJUSTMENT
This control was factory preset and will not normally
require additional adjustment of pilot flame.
The pressure regulator has been factory adjusted for
3.5” W.C. (Natural Gas, full flow) or 11.0” W.C. (LP Gas,
full flow). Although additional adjustments will not nor-
mally be necessary, the regulator may be adjusted if
required. Do not force the adjusting screw beyond the
limits that it can easily be adjusted.
If the pilot flame is low and does not engulf the bulb of the
mercury flame sensor, the system will not energize the
main valve.
If pilot gas pressure is too high, gas will sputter past the
ignition electrode, and may not ignite. High pilot gas
pressure may also cause the flame to lift off the burner,
causing the flame sensor bulb to sense “low” heat.
1. Attach a manometer to the outlet pressure tap of the
valve.
2. Energize valve to ignite main burner.
To adjust the pilot flame, remove the pilot adjust cover
screw and gasket (see fig. 6) to expose adjusting screw.
To REDUCE pilot flame, turn the pilot adjust screw
clockwise. To INCREASE pilot flame, turn the pilot
adjustscrewcounterclockwise.Replaceandtightencover
screw and gasket.
3. Remove “Reg. Adj.” cover screw (see fig. 6).
4. To DECREASE outlet pressure, turn the adjusting
screw (beneath the cover screw) counterclockwise.
To INCREASE outlet pressure, turn the adjusting
screw clockwise.
5. Replacethecoverscrew. Cyclethevalvetwoorthree
times to verify regulator setting.
Pilot Adjust
Cover Screw
NATURAL-LP
GAS SELECTOR
Gasket
REGULATOR
COVER SCREW
ON
O F F
PILOT ADJUST
COVER SCREW
Pilot
Adjust
Screw
Figure 5. Pilot flame adjustment
Figure 6. Gas valve top
4
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PILOT LIGHTING INSTRUCTIONS
AND PRECAUTIONS
FOR YOUR SAFETY READ BEFORE LIGHTING
If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
!
WARNING
A. This appliance is equipped with an intermittent ignition
device which automatically lights the pilot. Do NOT try to
light the pilot by hand.
phone. Follow the gas supplier’s instructions.
•
If you cannot reach your gas supplier, call the fire
department.
B. BEFORE LIGHTING, smell all around the appliance area
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by
hand, don’t try to repair it; call a qualified service techni-
cian. Force or attempted repair may result in a fire of
explosion.
FOR YOUR SAFETY
“WHAT TO DO IF YOU SMELL GAS”
•
•
Do not try to light any appliance.
D. Donotusethisapplianceifanyparthasbeenunderwater.
Immediately call a qualified service technician to inspect
theapplianceandtoreplaceanypartofthecontrolsystem
and any gas control that has been under water.
Do not touch any electrical switch; do not use any
phone in your building.
•
Immediatelycallyougassupplierfromaneighbor’s
LIGHTING INSTRUCTIONS
1. STOP! Read the precautionary information above.
7. Wait five (5) minutes to clear out any gas. If you then smell
gas, STOP! Follow B in the precautionary information
above. If you don’t smell gas, go to next step.
2. Set the thermostat to lowest setting.
3. Turn off all electrical power to the appliance.
8. Turn knob on gas control counterclockwise to ON.
9. Replace pilot access panel(s).
4. This appliance is equipped with an intermittent ignition
device which automatically lights the pilot. Do NOT try to
light the pilot by hand.
10. Turn on all electrical power to the appliance.
11. Set thermostat to desired setting.
5. Remove the pilot access panel(s) located under the gas
control unit.
12. If the appliance will not operate, follow the instructions “To
Turn Off Gas To Appliance” and call your service techni-
cian or gas supplier.
6. Push in gas control knob slightly and turn clockwise to
OFF (see Figure 7).
NOTE: Knob cannot be turned to OFF unless knob is
depressed slightly. Do not use tools or excessive force.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
4. Depress gas control knob slightly and turn clockwise to
OFF. Do not use tools or excessive force.
2. Turn off all electrical power to the appliance if service is to
be performed.
5. Replace control access panel.
3. Remove control access panel
Gas Cock
Knob
Indicator
Figure 7. Gas Cock Knob
5
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If you need more information about this product, please write to us at:
WHITE-RODGERS DIVISION, Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attn: Technical Service Department
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