37C72U
Water Heater Thermostat Control
Installation Instructions
WHITE-RODGERS
(Left-Hand Outlet Thread Model)
FOR LP GAS ONLY
RETAIN INSTRUCTIONS FOR FUTURE REFERENCE.
FOR YOUR SAFETY
“WHAT TO DO IF YOU SMELL GAS”
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediatelycallyourgassupplierfromaneighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
WARNING
!
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Do not use this LP Gas control on a Natural Gas
water heater. Improper operation could occur, re-
sulting in personal injury and/or death due to Car-
bon Monoxide poisoning, fire, or explosion. Check
for proper gas type as listed on the rating plate
affixed to the water heater.
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H O T T E R W A T E R
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R I S K O F S C A L D I N G
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C A U T I O N :
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B
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NOTE
Fixed Adjustment Main and Pilot Regulators
This gas control is equipped with LEFT-HAND threads in
the outlet for use on LP gas water heaters where the
connection between the gas control and the main burner
manifold are with LEFT-HAND threads.
The main and pilot gas regulators require no field
service. They automatically control and maintain the
outlet main and pilot burner gas pressure.
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS BEFORE INSTALLING OR OPERATING THIS
CONTROL COULD CAUSE PROPERTY DAMAGE, PERSONAL INJURY AND/OR DEATH.
1. This control must be installed or serviced only by a
professional.
7. In some situations, the gas may lose its odor. To detect
unodorized gas, you must have a gas detector which
canbepurchasedfromyourgascompany. Ifyoudonot
have a detector and have the slightest suspicion that
gas may be present, get out of the house and call the
gas company. DO NOT RELY TOTALLY ON YOUR
NOSE.
2. Do not use force when moving the gas control knob. If
you cannot turn the knob with hand pressure only, the
control must be replaced.
3. Do not use the control if the knob will not “pop up” after
being depressed while the knob is in the PILOT posi-
tion. The mechanism is damaged and the control must
be replaced. Shut off gas to the water heater.
8. Ifanyproblemsorquestionsareencounteredaboutthe
safe use of LP gas, contact your local gas supplier.
4. For your safety, this control is supplied with tamper
resistant screws. Do not attempt to repair or adjust the
control. If you experience problems, replace the control
immediately. Continuing to use a damaged control
could result in fire and/or explosion.
WARNING
!
Scald burns occur in under one second with 160°
water, which this thermostat will deliver if the
temperature dial is set at “VERY HOT”. Lower
settings of the temperature dial will reduce the risk
of scald and will reduce your fuel bill.
5. LP gas is heavier than air. Leaking gas will settle near
the ground and will tend to accumulate.
6. An odorant has been added to the gas to help you
detect it. Before lighting, search for the odor of gas by
sniffing at floor level around the water heater.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-6093A
Printed in U.S.A.
9912
d. Recheck for leaks.
CAUTION
!
e. Rinse off soapy solution and wipe dry.
Never use this water heater unless it is completely
filled with water. To prevent damage to the tank,
the tank must be filled with water. Water must flow
from the hot water faucet before turning ON gas to
the water heater.
WARNING
!
DO NOT USE OPEN FLAME OR ANY KIND OF
SPARK TO CHECK FOR LEAKS. Serious injury or
death from fire or explosion could result.
7. Open gas shutoff valve.
8. BEFORE LIGHTING THE PILOT, CHECK THE GAS
LINES FOR LEAKS:
9. Affix the new Lighting Instruction label on the water
heater to cover the existing label.
a. Use a soapy water solution. DO NOT test for gas
leaks using a match or open flame.
NOTE
b. Brush the soapy water solution on all gas pipes,
joints, and fittings.
The rating plate must be left visible for future reference.
c. Check for bubbling soap. This means you have a
leak. Turn OFF the gas and make the necessary
repairs.
TO LIGHT APPLIANCE
1. Set control to lowest setting by turning the water tem-
6. Turn gas control knob counterclockwise
to “PILOT”.
perature dial clockwise (
) to the “PILOT LIGHT-
ING” position. DO NOT FORCE.
7. Depress control knob all the way and hold down.
Immediately light the pilot with a match. Continue to
hold knob down for approximately one (1) minute after
pilot is lit. Release knob and it will pop back up. Pilot
should remain lit. If pilot goes out, repeat steps 2, 3, 6
and 7.
GAS
CONTROL
KNOB
TEMPERATURE
POINTER
•
If knob does not pop up when released, turn knob
clockwise to “OFF”. STOP and immediately call
your service technician or gas supplier.
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WATER
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TEMPERATURE
DIAL
V
CAUTION:
•
If the pilot will not stay lit after several tries, turn gas
control knob to “OFF” and call your service techni-
cian or gas supplier.
C
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RISK OF SCALDING
INCREASES WITH
HOTTER WATER
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B
A
8. Replace inner and outer burner doors.
Figure 2. Gas Control Knob and
Water Temperature Dial
9. At arm's length away, turn gas control
knob counterclockwise to the full “ON”
position.
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2. Turn gas control knob clockwise to “OFF”.
10. Align the water temperature dial mark ( ) with the
temperature pointer on the cover. This mark, indicative
of approximately 120°F, is the preferred starting point.
If hotter water is desired, see TEMPERATURE REGU-
LATION on page 4.
NOTE
Gas control knob must be depressed slightlyto turn
from "PILOT" to "OFF". Do not use tools or exces-
sive force.
11. Check for leaks at the pilot and main burner fittings on
the gas control with the main burner firing. Use a soapy
water solution. If a leak is detected, turn the gas supply
off and make repairs.
3. Wait at least five (5) minutes to clear out any gas, and
then smell around the appliance area. If you smell gas,
STOP! Follow instructions “What to do if you smell
gas” on the first page of this instruction sheet. If you do
not detect gas, continue with the next step.
4. Remove inner and outer burner doors located on the
water heater under gas control unit.
5. Find pilot - follow small metal
tubes from gas control. The
pilot is located near the main
PILOT
THERMO-
burner.
BURNER COUPLE
3
TEMPERATURE REGULATION
After the gas connections are made, water is in the heater
and the pilot light is ignited, the control must be set to the
desired water temperature.
To avoid scald injury, set the control at the lowest setting
which will still deliver your needed hot water.
WARNING
!
The recommended water temperature dial setting is at the
arrow ( ). The water temperature out of the heater at this
setting will be approximately 120°F.
The hotter the water the greater the risk of scald
injury and the shorter the time to cause injury.
If you use hot water frequently and in short spurts, water
temperature can occasionally exceed the temperature set-
tingbyupto30°Fbecauseofthedynamicsoftheappliance.
APPROXIMATE
TEMPERATURE
(°F)
APPROXIMATE
TIME TO
CAUSE INJURY
SETTING
(
)
120° ±10°
130° ±10°
140° ±10°
150° ±10°
160° ±10°
5 Minutes
30 Seconds
5 Seconds
A
B
C
1.5 Second
VERY
HOT
Under 1 Second
TEMPERATURE
POINTER
Be sure to protect babies and the infirm or others with
impaired mobility who cannot get out of the hot water
quickly. They are the people most commonly hurt in
scald injuries and in need of lower temperature and other
protection like supervision, point-of-use temperature
control equipment or a system mixing valve. A point-of-
use valve or a system mixing valve can be obtained from
your plumber.
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WATER
TEMPERATURE
DIAL
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CAUTION:
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RISK OF SCALDING
INCREASES WITH
HOTTER WATER
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B
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Figure 3. Water Temperature Dial
The arrow ( ) setting is the safest and most economical. If
you want hotter water, rotate the water temperature dial
WARNING
!
counterclockwise (
) to a higher setting. Approximate
Never allow small children to use a hot water tap,
or to draw their own bath water. Never leave a child
or impaired person unattended in a bathtub or
shower. Scald burns can result.
water temperature delivered at the different settings is
shown in the following table.
TO TURN OFF GAS TO APPLIANCE
Set the control to lowest setting by turning water tempera-
Turn gas control knob clockwise to “OFF”.
ture dial clockwise (
) to the “PILOT LIGHTING”
position on dial (as shown in Figure 3). DO NOT FORCE.
NOTE
Turn gas control knob clockwise to “PILOT”.
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Gas control knob must be depressed slightly. Do not use
tools or excessive force.
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Review and leave these instructions with the consumer!
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