White Rodgers Marine Radio 36C21 User Manual

36C21 Series  
Main Gas Valves  
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  
These Gas Valves control the flow of gas to the main  
burner under command of a room thermostat. They are  
suitable for use on all gases and may be used with all  
types of gas heating equipment. They may be mounted in  
any position except upside down.  
NOTE  
Some parts of this gas valve are also used to make more  
complex combination gas controls. Disregard the nota-  
tions “Pilot”, “Pilot Adj.” and “Vent ”. Although these  
notations do appear on the valve, they are not functional  
on model 36C21 Series controls.  
SPECIFICATIONS  
Electrical Rating:  
CAUTION  
!
Main Valve  
Do not use this valve on indoor LP gas furnaces  
except with 100% shut-off system.  
Model No.  
36C21U  
36C21  
Voltage  
750 MV  
24 volts  
Current  
D.C.  
.23 Amp  
Mounting: Any position except upside-down  
36C21A  
120 volts .035 Amp  
MOUNTING POSITIONS:  
Upright, 90° from upright or vertical  
INLET BOSS  
Maximum Pressure Rating:  
14" W.C. (12 lb. per sq. in.)  
Ambient Temperature: -40° to 175°F  
UPRIGHT  
UP OR DOWN  
LEFT OR RIGHT  
360°  
PIPE SIZES/CAPACITIES  
Capacity (BTU/hr) at  
1” pressure drop across valve  
Nat. Gas  
LP Gas  
Pipe Size (1000 BTU/cu. ft., (2500 BTU/cu. ft.,  
(inches)  
12” x 38”  
12” x 12”  
12” x 34”  
34” x 34”  
64 Sp. Gr.)  
100,000  
230,000  
230,000  
280,000  
1.53 Sp. Gr.)  
162,000  
372,600  
372,600  
453,600  
WHITE-RODGERS DIVISION  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
PART NO. 37-4048B  
Replaces 37-4048, 37-2570, 37-1972  
Printed in U.S.A.  
9615  
ST. LOUIS, MISSOURI 63123-5398  
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INSTALLATION  
SYSTEM WIRING  
CAUTION  
MAIN PIPING CONNECTIONS  
WARNING  
!
!
Failure to turn off electric or main gas supply to  
heating system could cause personal injury and/  
or property damage by shock, gas suffocation,  
fire, and/or explosion.  
To prevent electrical shock and/or equipment  
damage,disconnectelectricalpowertosystemat  
main fuse or circuit breaker box until installation  
is complete.  
1. Turn off electrical power to the system at the fuse box  
or circuit breaker. Also turn off the main gas supply.  
NOTE  
Allwiringshouldbeinstalledinaccordancewithlocal  
and national electrical codes and ordinances.  
2. If replacing an existing valve, disconnect all plumbing  
and electrical connections from the old control.  
3. Thecontrolmaybeinstalledinanyorientationexcept  
upside down. The arrow on the valve indicates the  
direction of gas flow through the control.  
Always check that the electrical power supply used  
agrees with the voltage and frequency shown on the  
gas control.  
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.  
Thesetypicalwiringdiagrams(figs.2and3)showonlythe  
terminal identification and wiring hook up. Always refer to  
wiring instructions provided by equipment manufacturer  
for system hook-up and operation.  
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. 1  
for typical piping connections).  
High  
Limit Thermostat  
Gas Valve  
Terminal Panel  
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.  
TR  
ALL WIRING  
MUST BE  
To Pilot  
Generator  
TH  
TH-TR  
N.E.C. CLASS 1  
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.  
Figure 2. Wiring for 36C21U  
High  
Limit  
Automatic  
Pilot  
Thermostat  
NOTE  
36C21  
Valve  
24 VAC  
All piping must comply with local codes, ordinances,  
and/or national fuel gas codes.  
Gas  
Valve  
NOTE: ALWAYS INCLUDE A  
DRIP LEG IN PIPING  
Figure 3. Wiring for 36C21 and 36C21A Models  
Drop  
Drop  
Gas Valve  
Horizontal  
Riser  
Horizontal  
Gas Valve  
3 in.  
minimum  
Gas Valve  
3 in.  
minimum  
3 in.  
minimum  
Riser  
Piped Gas  
Supply  
Tubing Gas  
Supply  
Piped Gas  
Supply  
Figure 1. Typical gas valve piping  
3
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ADJUSTMENT  
PILOT GAS ADJUSTMENT  
Pilot Adjust  
Cover Screw  
If the pilot flame is low and does not engulf the bulb of the  
mercury flame sensor, the system will not energize the  
mainvalve.Ifpilotgaspressureistoohigh,gaswillsputter  
past the ignition electrode, and may not ignite. High pilot  
gas pressure may also cause the flame to lift off the  
burner,causingtheflamesensorbulbtosense"low"heat.  
Gasket  
Pilot  
Adjust  
Screw  
To adjust the pilot gas pressure:  
Remove the cover screw (see fig. 4).  
To REDUCE pilot pressure, turn the pilot adjust screw  
(beneath the cover screw) clockwise.  
To INCREASE pilot pressure, turn the pilot adjust  
Figure 4. Pilot gas adjustment  
screw counterclockwise.  
Replace and tighten cover screw.  
PILOT LIGHTING  
Before lighting the pilot burner flame, remove one of pilot  
generator leads from the valve. This will prevent main gas  
valve from opening during the pilot lighting procedure,  
even if thermostat should be calling for heat.  
If you need further information about this product, please write to  
White-Rodgers Division, Emerson Electric Co.  
9797 Reavis Road  
St. Louis, MO 63123-5398  
Attention: Technical Service Department  
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