White Rodgers Thermostat 37E73A 918 User Manual

37E73A-918, 921, 922 or 927 INTELLI-VENT™  
Water Heater Thermostat Control Installation Instructions  
For Natural Gas Only  
Operator: Save these instructions for future use!  
FAILURETO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE  
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL  
INJURY AND/OR PROPERTY DAMAGE.  
DESCRIPTION  
The 37E73A-9XX 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-IGNITIONtechnology to greatly  
extend the ignitor’s life.  
Adjustable Regulator Controls: The gas regulator on this  
control requires no field service. The regulator is factory  
adjustable for the proper burner gas pressure.  
PRECAUTIONS  
WARNING  
“WHAT TO DO IFYOU SMELL GAS”  
Do not try to light any appliance.  
!
WARNING  
!
FIRE, SHOCK AND EXPLOSION HAZARDS  
• Shut off main gas to appliance for service or until  
installation is complete.  
• Disconnect electric power before servicing.  
• Do not exceed the specified voltage.  
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.  
• Replace existing control with recommended  
model.  
• Protect the control from direct contact with water  
(dripping, spraying, rain, etc.)  
WARNING  
!
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.  
• If the control has been in direct contact with water,  
replace the control.  
• Label all wires before disconnection when servic-  
ingcontrols.Wiringerrorscancauseimproperand  
dangerous operation.  
• Route and secure wiring away from flame.  
• Ensure proper earth grounding of appliance.  
• Ensure proper connection of line neutral and line  
hot wires.  
• Do not use tools to operate this control.  
• Do not take control apart, there are no serviceable  
CONTENTS  
Description ............................................................. 1  
Precautions ............................................................ 1  
Specifications......................................................... 2  
Installation.............................................................. 2  
Operation................................................................ 7  
Wiring..................................................................... 6  
Troubleshooting...................................................... 8  
parts inside.  
• Do not use control if it has been flooded.  
• Never stand on the control or use as a step.  
PART NO. 37-7110A  
0950  
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INSTALLATION  
fig. 3). Always adjust regulator to provide the correct  
CAUTION  
!
pressure according to the original equipment manufacturer’s  
specifications listed on the appliance rating plate. Replace  
regulator cover screw.  
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.  
6. Turn off all electrical power system to the system.  
7. Remove manometer hose from outlet pressure tap.  
8. Remove hose fitting and re-install the 1/8 NPT pressure  
tap plug. Tighten to 60 in-lb max.  
9. Turn on electrical power to the system.  
10.Turn on system power and energize valve.  
SHUT-OFF VALVE  
GAS SUPPLY  
PIPE  
11. Using a leak detection solution or soap suds, check  
for leaks at pressure boss screw or pressure tap plug.  
Bubbles forming indicate a leak. SHUT OFF GAS AND FIX  
ALL LEAKS IMMEDIATELY.  
GROUND JOINT UNION  
INTELLI-VENT™  
CONTROL  
TEE  
Outlet Pressure  
Regulator Adjust  
Tower  
DRIP LEG  
(SEDIMET TRAP)  
3" MINIMUM  
(MANDATORY)  
PIPE CAP  
Figure 1. Typical gas connection  
1/8 Threaded Outlet  
Pressure Tap  
d. Check all new water piping for leaks. Repair as needed.  
8. Open the gas shutoff valve.  
9. BEFORE TURNING ON THE APPLIANCE, CHECK THE  
37E Intelli-Vent™ Control  
GAS LINES FOR LEAKS.  
a. Use a soapy water solution. DO NOT test for gas leaks  
using a match or open flame.  
Outlet Pressure  
Regulator Adjust  
Tower  
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.  
1/8 Threaded Outlet  
Pressure Tap  
36G Valve  
Figure 2. Pressure port and regulator adjust locations  
PRESSURE REGULATOR ADJUSTMENT  
These controls are shipped from the factory with the regulator  
set as specified on the control label. Consult the appliance  
rating plate to ensure burner manifold pressure is as specified.  
If another outlet pressure is required, follow these steps.  
Regulator  
Cover Screw  
NOTE  
Plastic  
Adjust Screw  
If a valve has been factory-adjusted for the 2.5 to 5 inches  
W.C. range, it cannot be field-adjusted outside that range.  
Regulator  
Spring  
1. Turn off all electrical power to the system  
2. These models have 1/8 NPT threaded taps. The outlet  
pressure tap plug will need to be removed and a separate  
hose fitting installed.  
3. Attached a hose and manometer to the separate hose  
fitting which has been installed in place of the 1/8 NPT  
threaded tap.  
4. Turn on system power and energize valve.  
5. Remove regulator cover screw and turn regulator adjust  
screw clockwise (  
) to increase pressure, or  
Figure 3  
counterclockwise (  
) to decrease pressure (see  
3
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INSTALLATION  
TEMPERATURE  
INDICATORS  
OPERATING INSTRUCTIONS  
1. The control uses an automatic ignition system to light  
the burner. DO NOT TRY TO MANUALLY LIGHT THE  
BURNER.  
TEMPERATURE  
ADJUSTMENT  
BUTTONS  
2. Wait at least five (5) minutes to clear out any gas, and  
then 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 instruction sheet.  
If you do not detect gas, continue with the next step.  
3. Make sure that both the inner and outer doors are in place.  
These doors are located where the burner tube enters the  
water heater at the bottom. Both doors must be in place  
for safe operation.  
Figure 4. Temperature Indicators and Adjustment  
b. To increase the temperature press and release the  
HOTTER button once. The temperature indicators will  
now display the new temperature setting.  
4. Turn on power to the water heater. This can be done either  
by turning on the disconnect switch to the water heater,  
or plugging in the water heater to a nearby outlet. The in-  
staller should have made this provision for you, and it must  
meet local and state ordinances or the National Electric  
Code, whichever applies.  
5. For a brief time (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 combi-  
nation of indicators remain illuminated, either refer to the  
troubleshooting section of this manual, or contact a quali-  
fied service person.  
Press and release the HOTTER button until you have  
reached the desired setting. HOLDING DOWN THE BUTTON  
WILL NOT CONTINUE TO RAISE THE SETTING. The Button  
must be pressed and released for each temperature change  
desired.  
To avoid scald injury, set the control to the lowest setting  
which will deliver your needed hot water. Refer to Table 1 to  
determine the approximate temperature setting, and the ap-  
proximate time for scald injury at that temperature.  
Table 1.Temperature Settings  
6. The water heater is now ready for operation, and will  
begin to heat the water to the factory default setting of  
approximately 70°F. If an alternate temperature setting is  
required, please refer to the following section “Temperature  
Regulation”.  
Display  
Approximate  
Temperature  
(+10oF)  
Approximate  
Time to Cause  
Injury  
A
B
C
70 (Vacation)  
110  
N/A  
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.  
115  
120  
5 minutes  
30 seconds  
5 seconds  
125  
130  
135  
To change the temperature setting for either cooler or warmer  
water, the following steps are necessary:  
140  
145  
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  
4). 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 indi-  
cators mean.  
150  
1.5 seconds  
160  
Under 1 second  
Flashing  
3. When you have completed setting the control wait 30  
seconds to see that the temperature indicators go off and  
the control enters “Sleep” mode. ALL OF THE TEMPERA-  
TURE INDICATORS WILL BE OFF DURING NORMAL  
OPERATION. If any time you see the indicators on, there  
may be a system error and you should consult the “Trou-  
bleshooting” section of this document, or contact a trained  
service professional.  
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 tem-  
perature change desired.  
If you use hot water frequently and in short spurts, water tem-  
perature can occasionally exceed the temperature setting by  
up to 30°F because of the dynamics of the appliance. Keep  
this in mind when you are selecting a temperature higher than  
the factory default setting.  
Be sure to protect babies and the infirm or others with im-  
paired mobility who cannot get out of the hot water quickly.  
4
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INSTALLATION  
2. Press and release the COOLER button as many times as  
needed until the green leftmost indicator is only lit. This  
temperature setting is approximately 70°F. Leave the gas  
turned on.  
3. When returning from vacation reset the temperature to  
that you noted in step 1.  
WARNING  
!
Scald burns occur in under one second with 160°F  
water, which this thermostat will deliver if the  
temperature is set at “VERY HOT”. Lower settings of  
the temperature will reduce the risk of scald and will  
reduce your fuel bill.  
Complete Shutdown  
1. Turn off the electrical disconnect on the appliance, or  
remove the plug from the receptacle, whichever applies.  
(Don’t worry; the Intelli-Ventcontrol will remember your  
correct temperature setting.)  
2. Turn off the gas supply to the water heater. The water  
heater is now completely shut down.  
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 system mixing  
valve can be obtained from your local plumber.  
Checking the temperature setpoint may be performed at any  
time by the procedure described on step 1 of “Temperature  
Regulation” on page 4. No other action is needed for check-  
ing temperature setpoint.  
3. To restart the water heater, follow the instructions in the  
section “Operating Instructions”.  
There are no user serviceable parts in this control. The  
control is supplied with tamper resistant screws. DO NOT  
attempt to repair or adjust the control. If you experience prob-  
lems, discontinue use and replace the control immediately.  
Continuing to use a damaged control could result in fire  
and/or explosion.  
SHUTTING OFF THE APPLIANCE  
Vacation Shutdown  
WARNING  
!
Service  
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  
If you wish to verify that the water heater is operating properly:  
1. Make sure there is power to the water heater.  
2. Make sure that the gas is turned on to the water heater.  
3. Initiate a call for heat by either drawing hot water from a  
nearby faucet or raising the temperature setting (see sec-  
tion “Temperature Regulation”).  
4. Watch the ignition sequence and compare it to the “Se-  
quence of Operation” chart on page 7.  
1. “Wake up” the temperature indicators by holding down both  
the COOLER and HOTTER temperature adjustment but-  
tons at the same time for one second (see Figure 2). One  
or two of the temperature indicators will light up. Make a  
note as to which indicators are illuminated so that you can  
reset the control to the same setting when you return from  
vacation.  
5. Note any error codes that appear and proceed to the next  
section “Troubleshooting”.  
5
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WIRING DIAGRAM  
A typical system wiring diagram is shown below. Use the  
water heater manufacturer’s wiring diagram for details of the  
installation. Always follow the instructions supplied with the  
water heater, and those of the water heater manufacturer.  
Intelli-VentWiring Diagram  
Typical Installation  
(Consult Appliance Manufacturer's Instructions For Details)  
INTELLI-VENTTM CONTROL  
BOTTOM VIEW  
INSET  
FLAMMABLE  
VAPOR  
SENSOR  
(IF EQUIPPED)  
IGNITOR AND  
FLAME PROBE  
ASSEMBLY  
BLACK  
WHITE  
GREEN  
TO POWER SUPPLY  
DISCONNECT  
AND OVERLOAD  
PROTECTION  
HIGH  
LIMIT  
SWITCH  
AIR  
PRESSURE  
SWITCH  
COMBUSTION  
BLOWER  
6
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SEQUENCE OF OPERATIONS  
APPLY POWER TO  
APPLIANCE  
Intelli-Vent™  
Sequence of Operation  
NO  
DISPLAY ERROR CODE  
OR  
IS FIELD WIRING  
CORRECT?  
1
2
YES  
NO  
REQUEST  
FOR HEAT  
PRESENT?  
YES  
IS  
WAIT FOR PRESSURE  
NO  
IS  
WAIT FOR PRESSURE  
SWITCH TO OPEN  
DISPLAY ERROR  
NO  
PRESSURE SWITCH  
PROVEN OPEN WITHIN  
SWITCH TO OPEN  
PRESSURE SWITCH  
PROVEN OPEN WITHIN  
DISPLAY ERROR  
5
SECONDS?  
NUMBER  
3
5
SECONDS?  
NUMBER  
3
YES  
YES  
COMBUSTION  
BLOWER ON  
COMBUSTION  
BLOWER ON  
ONE HOUR AUTO  
LOCKOUT RESET  
DELAY  
IS  
IS  
WAIT FOR PRESSURE  
SWITCH TO CLOSE  
DISPLAY ERROR  
WAIT FOR PRESSURE  
SWITCH TO CLOSE  
DISPLAY ERROR  
PRESSURE SWITCH  
PROVEN CLOSED  
NO  
PRESSURE SWITCH  
PROVEN CLOSED  
NO  
WITHIN  
SECONDS?  
5
WITHIN  
SECONDS?  
5
NUMBER  
4
NUMBER  
4
YES  
YES  
PREPURGE  
TURN OFF INDUCER  
DISPLAY ERROR CODE  
NO  
IS  
IGNITOR  
OKAY?  
NUMBER  
5
TURN OFF INDUCER  
AFTER POST-PURGE  
YES  
COMBUSTION  
BLOWER OFF  
DISPLAY ERROR  
6
IGNITOR ON FOR  
WARM-UP TIME  
MAIN VALVE OPENS  
INTERPURGE  
MAIN  
BURNER LIGHTS  
AND IS SENSED  
DURING TRIAL  
FOR  
LESS  
THAN  
FOR IGNITION?  
NO  
YES  
MAIN VALVE CLOSES  
3
TRIES  
IGNITION  
NO  
YES  
IGNITOR TURNS OFF  
LOST  
IS  
FLAME SENSE  
LOST?  
YES  
YES  
MAIN VALVE CLOSES  
LESS THAN  
TIMES?  
3
NO  
NO  
NO  
IS  
REQUEST FOR HEAT  
SATISFIED?  
YES  
Please Note:  
MAIN VALVE OFF  
The control continually monitors  
internal circuits and external sensors.  
Error codes noted above, and those for  
self-diagnostic faults can be found on  
pages 8 and 9.  
COMBUSTION  
BLOWER OFF AFTER  
POST-PURGE DELAY  
7
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TROUBLESHOOTING  
The troubleshooting charts cover the error codes that the  
Intelli-Vent™ control can recognize, the potential cause, and  
those actions that may help repair the problem. The water  
heater manufacturer’s troubleshooting procedure should be  
consulted before attempting to repair the appliance. The wa-  
ter heater manufacturer’s instructions take priority over the  
instructions here.  
perature setting (see section “Temperature Regulation”).  
If you have noted an error code from a previous heating  
cycle, this step is not necessary, and you may proceed  
with the next step.  
2. Refer to the troubleshooting charts on below to find the  
error code that is displayed. Check and repair those items  
recommended.  
If for any reason you question your ability, or feel any doubt  
about your ability to perform any of the troubleshooting pro-  
cedures or repairs recommended. STOP! Contact a trained  
and qualified service professional to repair the water  
heater.  
3. Once the repair is complete, again initiate a call for heat,  
and observe that the ignition sequence complies with that  
shown on page 7.  
4. After the water heater repair is complete, return the water  
heater temperature setting to the original temperature. If  
for any reason you cannot remember the original setting,  
return the setting to the 120oF setpoint. See the section  
Temperature Regulation” for assistance in setting the wa-  
ter temperature setting.  
To troubleshoot the system using the error code indicators:  
1. Check that the system is currently active and calling for a  
request for heat.You can initiate a call for heat by either  
drawing hot water from a nearby faucet or raising the tem-  
Error  
Indication  
Check, Repair, or Replace  
An open earth ground cir-  
cuit to the ignition system  
1. Check that the earth ground conductor is properly  
connected at the fuse box or breaker panel and the  
water heater.  
2. Check that the grounding conductors on the water  
heater are properly connected and secure.  
A
A
B
B
C
C
1
The self diagnostic test  
detected a wiring error or  
a high resistance to earth  
ground  
1. Check for proper connection of the line neutral and  
line hot wires.  
2. Check that the appliance is securely connected to  
earth ground.  
2
3
4
The pressure switch re-  
mained closed longer that  
5 seconds after the call for  
heat began.  
1. The pressure switch wiring is incorrect.  
2. The pressure switch is defective and must be  
replaced.  
A
A
B
B
C
C
The pressure switch re-  
mained open longer than 5  
seconds after the combus-  
tion blower was energized  
1. The pressure switch wiring is incorrect.  
2. The pressure switch tubing is not connected cor-  
rectly.  
3. Obstructions or restrictions in the water heater air  
intake or exhaust flue.  
The self diagnostic test has 1. Check that all wiring is correct and secure.  
A
A
B
B
C
C
5
detected an error in the Hot  
Surface Ignitor circuit.  
2. Disconnect the ignitor and measure the ignitor re-  
sistance with an accurate ohmmeter between pins  
1 and 2. Resistance should be between 11.5 and  
18.8 ohms. If the reading is incorrect, replace the  
Hot Surface Ignitor.  
3. If the above checks are good, replace the INTELLI-  
VENT™ control.  
1
2
3
4
The maximum number of  
ignition retries or recycle  
has been reached and the  
system is in lockout  
1. Check if the gas supply is off or too low to operate.  
6
2. Check that the flame sense rod to see that it is  
located properly and free from contamination.  
Reposition the flame sense rod or lightly clean with  
an abrasive cloth.  
3. The Hot Surface Ignitor may not be positioned cor-  
rectly. Reposition as necessary.  
4. The Hot Surface Ignitor and Flame Sense Rod  
wired correctly and in good working condition.  
Repair as required.  
5. Low voltage to the water heater. Check and repair.  
8
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TROUBLESHOOTING  
The self diagnostic test  
found a problem with the  
gas valve driver circuit  
1. Cycle power to the water heater off for 10 seconds  
and then back on.  
2. If the above step did not cleat the error, the INTEL-  
LI-VENT™ control must be replaced  
A
A
A
B
B
B
C
C
C
7
8
9
The self diagnostic test has 1. Cycle the external power off for 10 seconds and  
detected a problem with  
the internal microcomputer.  
then back on.  
2. If the above step does not clear the error, the  
INTELLI-VENT™ control must be replaced.  
The self diagnostic test has 1. Cycle the external power off for 10 seconds and  
detected a problem with  
the internal circuit  
then back on.  
2. If the above step does not clear the error, the  
INTELLI-VENT™ control must be replaced.  
Flame signal sensed out of 1. Replace the INTELLI-VENT™ control.  
proper sequence.  
A
A
B
B
C
C
10  
11  
The high temperature ther- 1. Replace the INTELLI-VENT™ control.  
mal cutoff is open  
The diagnostic test has de- 1. Make sure that there are no objects leaning against  
A
B
C
12  
tected one of the tempera-  
ture adjust buttons stuck  
closed  
the front of the control.  
2. Lightly press and release each of the buttons once.  
3. If the above actions do not clear the error, the  
control will continue to regulate water temperature  
at the last setting, but you not be able to change  
settings unless you replace the INTELLI-VENT™  
control.  
The self diagnostic test  
1. Check that all wiring is correct and that there are no  
open or shorted circuits.  
2. If no wiring problems are found the INTELLI-  
VENT™ control must be replaced by a qualified  
service person.  
A
B
C
13  
has detected that the water  
temperature sensor is ei-  
ther open or short circuited.  
The self diagnostic test  
found a problem with the  
Flammable Vapor Sensor  
1. Check that all wiring is correct and that there are no  
open or shorted circuits.  
2. If no wiring problems are found the flammable  
Vapor Sensor must be replaced.  
A
A
B
B
C
C
14  
15  
The control detected the  
presence of flammable  
vapors near the appliance  
and entered lockout.  
1. If you smell gas, STOP! Follow the instructions,  
“What to do if you smell gas” on page 1 of this  
instruction sheet. Otherwise call a qualified service  
person for replacement of the control.  
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NOTES  
10  
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NOTES  
11  
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White-Rodgers is a division  
of Emerson Electric Co.  
The Emerson logo is a  
trademark and service mark  
of Emerson Electric Co.  
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