Emerson 37E73A-906, 37E73A-903 User Manual
37E73A-903 & 906 INTELLI-VENT™
WARNING
!
WARNING
!
WARNING
!
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.
The 37E73A-903/906 INTELLI-IGNITION™ control is a
combination gas valve, ignition control, and thermostat for
use on Power Vented water heaters. The microcomputer in
the control supervises the ignition sequence and timings
for the water heater, and provides diagnostic codes in case
of system malfunction. The control provides direct burner
ignition using the White-Rodgers’ Silicon Nitride ignitor. The
control uses the INTELLI-IGNITION™ technology to greatly
extend the ignitor’s life.
Fixed Adjustment Regulator Controls: The gas regulator
on this control requires no field service. The regulator
automatically controls and maintains the burner gas pressure.
Water Heater Thermostat Control
Installation Instructions
For Natural Gas Only
DESCRIPTION
“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.
•Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s Instructions
•If you cannot reach your gas supplier, call the fire
department.
Do not use this Natural Gas control on LP Gas water
heater. Improper operation could occur, resulting in
personal injury and/or death due to Carbon Monoxide
(CO) poisoning, fire, or explosion. Check for proper
gas type as listed on the rating plate affixed to the
water heater.
.
CONTENTS
Description ............................................................. 1
Precautions ............................................................ 1
Specifications ......................................................... 2
Installation .............................................................. 2
Wiring ..................................................................... 5
Operation ................................................................ 6
Troubleshooting ...................................................... 7
PRECAUTIONS
FIRE, SHOCK AND EXPLOSION HAZARDS
• Shutoffmaingastoapplianceforserviceoruntil
installation is complete.
• Disconnectelectricpowerbeforeservicing.
• Donotexceedthespeciedvoltage.
• Replace existing control with recommended
model.
• Protectthecontrolfromdirectcontactwithwater
(dripping, spraying, rain, etc.)
• Ifthecontrolhasbeenindirectcontactwithwater,
replace the control.
• Labelallwiresbeforedisconnectionwhenservicing controls. Wiring errors can cause improper and
dangerous operation.
• Routeandsecurewiringawayfromame.
• Ensureproperearthgroundingofappliance.
• Ensureproperconnectionoflineneutralandline
hot wires.
• Donotusetoolstooperatethiscontrol.
• Donottakecontrolapart,therearenoserviceable
parts inside.
• Donotusecontrolifithasbeenooded.
• Neverstandonthecontroloruseasastep.
www.white-rodgers.com
www.emersonclimate.com
PART NO. 37-7109A
0951
SPECIFICATION
NOTE
NOTE
ELECTRICAL RATINGS:
Input and Frequency: 120 VAC, 60 Hz
Output Ratings:
Ignitor Load: 2 Amps maximum
Inducer Draft Motor: 3 Amps Full Load, 4 Amps Locked
Rotor
Current: 0.2 Amps @ 120 VAC
Range of Regulation (Btu/Hr)
Minimum: 30,000 Maximum: 150,000
1.0” Pressure Drop Capacity
100,000 Btu/Hr
a
Based on 1000 Btu/ft3, 0.64 specify gravity natural gas
Maximum Inlet Pressure: 1/2 PSI maximum
Ambient Temperature Rating:
32oF to 160oF (0oC to 70oC )
a
Automatic High Temperature Cutoff:
Single-Use Type, 185oF(82oC)
Prepurge Time: 5 Seconds
Ignitor Warm-up Time: 20 Seconds
Trial for Ignition Period: 4 Seconds
Inter-purge Time: 5 Seconds
Post-purge Time: 5 Seconds
Ignition Retries: 2 Retries; 3 Trials before lockout
Ignition Recycles: 2 Recycles, 3 Losses of flame before
lockout
BODY CONFIGURATION:
Right angle with a 1/2” NPT inlet and a 1/2” inverted flare
outlet
MOUNTING:
Limited Horizontal/Vertical
INSTALLATION
To protect the control from dirt and contamination, a drip leg
or sediment trap (see Figure 1) must be installed in the piping
1. This control must be installed or serviced only by a
professional.
2. 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.
3. An odorant has been added to the gas to help you
detect it. Before lighting, search for the odor of gas by
snifngatoorlevelaroundthewaterheater.
4. In some situations, the gas may lose its odor. To detect
unodorized gas, you must have a gas detector, which
can be purchased from your gas company. If you do
not 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.
REMOVING THE OLD CONTROL
1. Shut off the gas to the water heater
2. Turn off electrical power to the water heater.
3. Remove the two plastic wire connectors that plug
into the bottom of the control. The connectors have
latches which must be depressed. DO NOT FORCE
THE CONNECTORS, DAMAGE TO THE WIRING MAY
RESULT.
4. Shut off the water at the cold water inlet.
5. Connect a hose to the water heater drain cock. Drain the
water to a nearby drain. Open a hot water faucet for faster
draining.
6. Disconnect the gas line at the union (Figure 1). Remove
the piping from the old control.
7. Remove the control by turning it counterclockwise ( ).
INSTALLING THE NEW CONTROL
All piping must comply with local and state ordinances or
with the National Fuel Gas Code (ANSI Z223.1-NFPA 54),
whichever applies.
Dirt or contamination in the gas line can block the control
from operating creating a risk of explosion, injury, or death.
leading to the control.
1. Apply pipe compound to the male threads of the pipe that goes
into the control, leaving the first two or three threads clean.
2. Install control in the tank. Turn clockwise (
short piece of pipe to help in turning. Align the control so
that the burner tube may be connected.
3. Make the main burner connection. Do not use pipe joint
compound or Teflon tape.
4. Connect the gas line. Use new black iron pipe that has
been properly reamed. If old pipe is used, be sure it
is clean and free from rust and scale. Use pipe joint
compound on male threads only. (Use pipe joint compound
approved for natural and LP gas service.) Do not use
TEFLON tape. Do not apply compound to the first two
threads.
5. DO NOT use joint compound or tape on the union
connection.
6. Make the electrical connections to the control. There
are two plastic connectors that plug into the bottom of
the control. The connectors are “keyed” so that they can
only be inserted one way. Make sure that the connectors
are properly aligned before attempting to insert. DO
NOT FORCE THE CONNECTORS; DAMAGE TO THE
CONTROL WILL RESULT.
7. To fill the water heater with water:
a. Close the water heater drain valve by turning the
handle to the right (clockwise). The drain valve is on
the lower front of the water heater.
b. Open the cold water supply valve to the water heater.
The cold water supply valve must be left open when the
water heater is in use.
c. To ensure complete filling of the tank, let air exit by
opening the nearest hot water faucet. Allow water to
run until a constant flow is obtained. This will let air out
of the water heater and the piping.
d. Check all new water piping for leaks. Repair as needed.
). Use a
2
GROUND JOINT UNION
INTELLI-VENT™
CONTROL
GAS SUPPLY
PIPE
TEE
DRIP LEG
(SEDIMET TRAP)
3" MINIMUM
(MANDATORY)
PIPE CAP
SHUT-OFF VALVE
CAUTION
!
Never use this water heater unless it is completely
TEMPERATURE
INDICATORS
TEMPERATURE
ADJUSTMENT
BUTTONS
filled with water. To prevent damage to the tank, the
tank must be lled with water.Watermustow from
the hot water faucet before turning ON gas to the
water heater.
Figure 1. Typical gas connection
8. Open the gas shutoff valve.
9. BEFORE TURNING ON THE APPLIANCE, CHECK THE
GAS LINES FOR LEAKS.
a. Use a soapy water solution. DO NOT test for gas leaks
using a match or open flame.
b. Brush the soapy water solution on all gas pipes, joints,
and fittings. Use care that excess solution does not
enter the control’s plastic housing.
c. Check for bubbling soap. This means you have a leak.
Turn OFF the gas and make the necessary repairs.
d. Turn on the gas and recheck for leaks. Repeat this
process until you are sure the system is gas-tight. If
repeated work on a part does not stop the leak, the
part must be replaced.
e. Rinse off the soapy solution and wipe all the plumbing
parts dry.
INSTALLATION
5. For a brief (one to five seconds) all of the indicators on
the front of the control should come on, and then turn
off. This indicates that the control has completed the
self-diagnostic test, and is ready for operation. If any
combination of indicators remain illuminated, either refer
to the troubleshooting section of this manual, or contact a
qualified service person.
6. The water heater is now ready for operation, and will
begin to heat the water to the factory default setting of
approximately 70
required, please refer to the following section “Temperature
Regulation.”
TEMPERATURE REGULATION
After the gas and electrical connections are made and the
water heater tank is full of water, the control will now start to
heat the water to the factory default setting of approximately
70°F. If a higher setting is desired, start with the setting at the
triangle( ). This is approximately the 120°F setting, and the
safest and most economical setting for the water heater.
To change the temperature setting for either cooler or warmer
water, the following steps are necessary:
1. “Wake up” the temperature indicators by pressing the
COOLER and HOTTER temperature adjustment buttons at
the same time and releasing after one second (see Figure
2). One or two of the temperature indicators will light up.
These indicators will only remain on for 30 seconds if no
further buttons are pressed. After 30 seconds the control
will go back to “Sleep” mode, and both buttons will again
have to be pressed to see the water temperature setting.
2. If this is the first time that the control has been used, the
leftmost green indicator will be illuminated indicating the
water temperature setting of approximately 70°F. See Table
1 for an explanation of what each of the temperature indicators mean.
o
F. If an alternate temperature setting is
1. The control uses an automatic ignition system to light
2. Wait at least five (5) minutes to clear out any gas, and then
3. Make sure that both the inner and outer doors are in place.
4. Turn on power to the water heater. This can done either
OPERATING INSTRUCTIONS
the burner. DO NOT TRY TO MANUALLY LIGHT THE
BURNER.
smell around the appliance area near the floor. If you smell
gas, STOP! Follow the instructions “What to do if you
smell gas” on the first page of this instructions sheet. If
you do not detect gas, continue with the next step.
These doors are located where the burner tube enters the
water heater at the bottom. Both doors must be in place for
safe operation.
by turning on the disconnect switch to the water heater,
or plugging in the water heater to a nearby outlet. The
installer should have made this provision for you, and
it must meet local and state ordinances of the National
Electric Code, whichever applies.
Figure 2. Temperature Indicators and Adjustment
a. To decrease the temperature press and release the
COOLER button once. The temperature indicators will
now display the new temperature setting. Press and
release the COOLER button until you have reached the
desired setting. HOLDING DOWN THE BUTTON WILL
NOT CONTINUE TO LOWER THE SETTING. The Button must be pressed and released for each temperature change desired.
b. To increase the temperature press and release the
HOTTER button once. The temperature indicators will
now display the new temperature setting.
3
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