Honeywell WT8840 User Manual

WT8840 TRADE WATER HEATER CONTROLS
WARNING
CAUTION
WARNING
WARNING
Perform Gas Leak Test
Fire or Explosion Hazard. Can cause severe injury, death or property damage.
Water Damage Hazard. Can damage electrical components in the WT8840.
Do not spray soap and water solution on the WT8840 housing. Do not use an excessive amount of soap and water to perform the gas leak test.
Gas Leak Test
1. Paint pipe connections upstream of the water
heater control with a rich soap and water solution. Bubbles indicate a gas leak.
2. If a leak is detected, tighten the pipe connection.
3.
Stand clear of the burner while lighting to prevent injury caused from hidden leaks that could cause flashback in the appliance burner compartment.
4. With the burner in operation, paint the pipe
joints (including adapters) and the control inlet and outlet with a rich soap and water solution.
5. If another leak is detected, tighten the adapter
screw, joints, and pipe connections.
6. Replace the part(s) if a leak cannot be stopped.
Check the gas input and burner flow rate
Fire or Explosion Hazard. Can cause severe injury, death or property damage.
Follow these warnings exactly:
1. Do not exceed input rating stamped on appliance nameplate or manufacturer recommended burner orifice pressure for size of orifice(s) used. Follow instructions of appliance manufacturer.
2. IF CHECKING GAS INPUT BY CLOCKING GAS METER: Make certain there is no gas flow through the meter other than to the appliance being checked. Other appliances must remain off with the pilots extinguished (or that consumption must be deducted from the meter reading). Convert flow rate to Btuh as described in form number 70-2602, Gas Controls Handbook, and compare to Btuh input rating on appliance nameplate.
3. IF CHECKING GAS INPUT WITH MANOMETER: Make sure the manual gas shutoff switch is in the OFF position before removing outlet pressure tap plug to connect the manometer (pressure gauge). Also, move the manual gas shutoff switch to the OFF position when removing the gauge and replacing the plug. Also shut off gas supply before disconnecting manometer and replacing plug. Repeat Gas Leak Test at plug with main burner operating.
Procedure to check the gas input and burner flow rate
1.
Check the full rate manifold pressure listed on the appliance nameplate. Water heater control full rate outlet pressure should match this rating.
2. With burner operating, check the water heater
control flow rate using the meter clocking method or check pressure using a manometer connected to the outlet pressure tap on the water heater control. See Fig. 5.
MAINTENANCE
Fire or Explosion Hazard. Can cause severe injury, death or property damage.
Do not attempt to take apart or clean the gas valve inside the WT8840 control. Improper cleaning or reassembly can cause gas leakage.
The maintenance program should include regular checkout of the control as outlined in the Startup and Checkout section, and the control system as described in the appliance manufacturer literature.
Maintenance frequency must be determined individually for each application. Some considerations are:
1. Cycling frequency. Appliances that may cycle
10,000 times annually should be checked monthly.
2. Intermittent use. Appliances that are used
seasonally should be checked before shutdown and again before the next use.
3. Consequence of unexpected shutdown. Where
the cost of an unexpected shutdown would be high, the system should be checked more often.
4. Dusty, wet or corrosive environment. Since these
environments can cause the control to deteriorate more rapidly, the system should be checked more often.
The system should be replaced if:
• It does not perform properly on checkout or troubleshooting.
• The control is likely to have operated for more than 150,000 cycles.
• The control is wet or looks as if it has been wet.
TROUBLESHOOTING
Troubleshooting With Status Indicator Assistance
1. Pilot burner must be lit. If not, push and hold
Pilot knob and light pilot with piezo. Error code will be displayed when thermopile heats up. Error code can be recognized by counting the number of flashes of the status indicator after a three second pause. One single flash (with set point knob in PILOT position) indicates that the control is in normal operation.
2. Observe status indicator on control; check and
repair the system as noted in Table 3 on page 6. Flash codes are displayed with a three-second delay between cycles. A continuous solid light indicates system shutdown when knob is turned from a temperature setting to OFF position. When the solid light is present, the pilot and
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WT8840 TRADE WATER HEATER CONTROLS
main valve will not hold. When the status indicator goes out, the user can restart the system. (Approximate shutdown time is one minute.)
3. After status indicator analysis and appliance
repair is complete, turn device knob to OFF, wait until the indicator goes out, then perform lighting procedure.
4. Status indicator light should be in normal mode
(1 flash) with the knob in the PILOT position. Turn the device knob past the water temperature in the tank should turn on the main burner. The Status indicator light will strobe every three seconds when there is a call for heat.
5. In the event of multiple failure codes, the next
failure code follows the previous failure code by approximately three seconds with higher flash count first.
Table 3. Troubleshooting with status light visual indication.
LED
Error
**
Normal operation. No action required.
Action required.
Code
1 flash every 3 seconds
Strobe every 3 seconds
2 flashes Low thermopile
4 flashes Temperature cut-out
5 flashes Water temperature
6 flashes Tank leakage
Number of LED Flashes*Detected Failure Recommended Action
Not an error; indicates the electronics is holding the Pilot Valve open and the Main Valve closed.
Not an error; indicates call for heat during normal operation, Main valve open.
voltage; main valve not turned ON.
limit reached.
sensor failure.
detected by accessory module.
You can now turn the knob to a desired setpoint temperature. LED will continue to flash 1 time every 3 seconds while in Idle mode (no call for heat).
None.
Check thermopile and its connections. Check pilot flame.
Check the valves and the water temperature sensor. Reduce the water temperature setpoint. Thoroughly check out main valve operation and water temperature control before walking away.
Check water temperature sensor and its connection for open circuits, shorts, or differences in resistance between the two sensor elements.
Control recovers after receiving message from accessory module.
7 flashes Electronics Failure Replace control module. 8 flashes This is just a warning;
Solid ON Not an error—
*
LED Error Codes are flashed once per second, with a three-second pause between repeating the error code.
**
Maximum two different errors can be displayed simultaneously if more than one error has been detected.
The control does not see power decaying with the knob in the OFF position.
indicates that the control is in OFF mode.
Check valves.
None; wait until LED turns off if you want to restart the system.
34-00013EF—03 6
WT8840 TRADE WATER HEATER CONTROLS
M22535D
TIME (MINUTES)
OUTPUT (mV)
THERMOPILE OUTPUT WITH TIME
500
600
400
300
200
100
0
012345678910
900
800
700
NORMAL RANGE
OUTPUT TOO LOW
Troubleshooting Without Status Indicator Assistance
Follow diagram in Fig. 6.
TROUBLESHOOTING GUIDE WITHOUT STATUS LIGHT
TURN DEVICE KNOB FROM OFF TO PILOT, PRESS DOWN KNOB AND HOLD, LIGHT PILOT BY DEPRESSING PIEZO IGNITION BUTTON, PILOT SHOULD LIGHT. – WATER TEMPERATURE IS BELOW THE CUT-OUT LIMIT
STATUS LIGHT SHOULD FLASH AFTER 1 MINUTE, LED WILL FLASH NORMAL SINGLE BLINK, RELEASE THE DEVICE KNOB, PILOT SHOULD REMAIN LIT
YES
YES
CHECK:
• INLET PRESSURE
NO
• MAKE SURE AIR IS BLED OUT OF SYSTEM
• PIEZO SPARKING TO THERMOPILE
• CLOGGED PILOT ORIFICE
• GAS LEAK IN PILOT TUBING CONNECTIONS
CHECK:
• WIRING OF THERMOPILE LEADS
NO
• FLAME COVERAGE OF THERMOPILE – THERMOPILE OUTPUT IS TOO LOW-RUN
THERMOPILE OUTPUT CHECK
TURN DEVICE KNOB TO DESIRED TEMPERATURE SETTING, BURNER WILL TURN ON ONLY IN ACTIVE CALL FOR HEAT (WATER TEMPERATURE IS LESS THAN TEMPERATURE SETTING MINUS DIFFERENTIAL); LED FLASHES 1 TIME EVERY 3 SECONDS DURING A CALL FOR HEAT.
YES
SYSTEM OK
Fig. 6. Troubleshooting without status light.
Thermopile Output Check
1. Turn device knob to OFF.
2. Disconnect thermopile leads.
3. Turn device knob to PILOT, hold down knob to
light pilot burner. Hold the knob down for five or more minutes.
4. After five minutes, check thermopile output by
connecting the voltmeter to the positive red lead and negative white lead.
5. Output should be at least 350 mV. (See Fig. 7.)
Connect the 3.6 ohm resistor between the two thermopile leads, the voltage should be at or higher than one half of the open circuit voltage.
6. The terminal housing prevents miswiring of
positive and negative leadwires.
7. Flame must envelop thermopile at Hot Junction
(3/8 in. below tip).
8. Keep heat away from cold junction (brass sleeve
of the thermopile) for maximum output.
CHECK:
NO
• EXCESSIVE INLET PRESSURE
• TANK TEMPERATURE IS AT OR CLOSE TO SET POINT
Fig. 7. Thermopile output.
M29431C
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WT8840 TRADE WATER HEATER CONTROLS
WARNING
WARNING
INSTRUCTIONS TO THE HOMEOWNER
Fire or Explosion Hazard. Can cause severe injury, death or property damage.
1. IF YOU SMELL GAS:
• Turn off the gas supply at the appliance service valve.
• Do not light any appliances in the house.
• Do not touch electrical switches or use the phone. Leave the building and use a neighbor’s phone to call your gas supplier.
• If you cannot reach your gas supplier, call the fire department.
2. The water heater control must be replaced in event of any physical damage, tampering, bent terminals, missing or broken parts, stripped threads or evidence of exposure to heat.
Scalding Hazard. Can cause burns, severe injury or death.
Never move temperature setpoint knob past the HOT setting without checking water temperature at the faucet, and readjusting until comfortably warm to the touch. Consider the ages and health of all who will come into contact with heated water.
IMPORTANT
Follow the operating instructions provided by the manufacturer of your water tank appliance. The information in this form describes a typical water heater control application, but the specific controls used and the procedures outlined by the manufacturer of your appliance can differ, requiring special instructions.
STOP: READ THE WARNINGS ABOVE.
If the appliance does not turn on when the setpoint knob is set several degrees above the previous temperature, follow these instructions:
1. Set the temperature setpoint knob to OFF.
2. Turn off the main gas valve to the appliance.
3. Wait five minutes to clear out any unburned gas.
If you then smell gas, STOP! Follow step 1 in the warning above. If you DO NOT smell gas, continue with the next step.
4. Turn on the gas supply to the appliance.
5. Restart the appliance by performing lighting
procedure.
6. Set the setpoint knob to the desired setting.
7. If the appliance does not turn on, turn off the
gas supply to the appliance and contact a qualified service technician for assistance.
8. Allow one minute for thermopile to cool before
re-lighting pilot.
TURNING OFF THE APPLIANCE
Complete Shutdown
1. Turn de vice kn ob to OFF. Tur n off the gas sup ply
to the appliance. Appliance will completely shut off.
2. Follow the procedure in the Instructions to the
Homeowner section above to resume normal operation.
Home and Building Technologies
In the U.S.: Honeywell 1985 Douglas Drive North Golden Valley, MN 55422
® U.S. Registered Trademark © 2017 Honeywell International Inc. 34-00013EF—03 M.S. Rev. 04-17 Printed in United States
Régulateurs de chauffe-eau de remplacement WT8840
NOTICE D'INSTALLATION
APPLICATION
Le régulateur de chauffe-eau WT8840 est conçu pour les applications à veilleuse permanente utilisant un puits d’immersion pour la détection de la température de l’eau. Tous les modèles WT8840 incluent un capteur de température à coefficient intégré.
Le WT8840 est alimenté par une thermopile chauffée par la flamme de la veilleuse permanente. Les veilleuses CS8840 sont conçues pour fonctionner avec ce régulateur.
Le puits d’immersion pour la détection de l’eau du capteur est muni de capteurs à thermistance à coefficient de température négatif adaptés. Ces capteurs fournissent un mécanisme avec sécurité intégrée par lequel le WT8840 peut fournir une régulation précise de la température de l’eau ainsi qu’une fonction de limitation de la température de l’eau (coupure de température ou TCO [Temperature Cut-Out]).
CARACTÉRISTIQUES
IMPORTANT
Les régulateurs WT8840 sont un remplacement direct uniquement.
Régulateur de pression : Le réglage du régulateur de
pression de sortie est indiqué sur l'étiquette du produit.
Plage de pression d'admission :
Voir la plaque signalétique de l'appareil pour la
plage de pression d'admission recommandée.
Pression d'entrée maximale de 0,5 PSI (14,0 po c.e.)
autorisée pour un fonctionnement correct.
Configuration du corps : 90° avec entrée de 1/2 po
et sortie conique inversée de 1/2 po.
Montage : À la verticale uniquement.
Entrée de régulateur :
Tension minimum : 350 mV c.c., circuit ouvert. Tension maximum : 850 mV c.c., circuit ouvert.
Capacité : Voir le Tableau 1.
Plage de régulation :
Gaz naturel :
Minimum : 30 000 Btuh. Maximum : 85 000 Btuh.
Plage de température ambiante : 0 à 66 °C
(32 à 150 °F)
Plage de température de fonctionnement :
-18 à 66 °C (0 à 150 °F)*
*La vanne fonctionne à -18 °C (0 °F) mais ses
caractéristiques ne peuvent pas être garanties tant que la température ambiante n'a pas atteint 0 °C (32 °F).
Plage de stockage : -40 à 66 °C (-40 à 150 °F)
Humidité : 95 % sans condensation à 40 °C (104 °F) Homologations :
Cet appareil est certifié par l'Association canadienne
de normalisation (CSA) pour les normes suivantes : ANSI Z21.20 ANSI Z21.23 ANSI Z21.78 ANSI Z21.87 CAN/CSA-C22.2 N° 199-M89 CAN1-6.6-M78 CSA 4.6 CSA 6.20
Accessoires :
Veilleuse CS8840
RÉGULATEURS DE CHAUFFE-EAU DE REMPLACEMENT WT8840
Numéro pièce de rechange Remplace Numéro FEO Remplacement FEO FEO
Réservoir, isolation de 1 po,
colonne d’eau de 4 po
Réservoir, isolation de 2 po,
colonne d’eau de 4 po
Réservoir, isolation de 1 po,
colonne d’eau de 5 po
Réservoir, isolation de 2 po,
colonne d’eau de 5 po
WV8840A1000 222-47463-01A
WV8840A1001 222-47463-01E Bradford White
WV8840A1050 222-47463-02A
WV8840A1051 222-47463-02E Bradford White
WV8840B1042 316910-000
WV8840B1109 316910-000 AOSmith
WV8840B1110 321166-000 AOSmith
WV8840B1059 316910-001
WV8840B1117 316910-001 AOSmith
WV8840B1118 321166-001 AOSmith
239-47463-01*
239-47463-02*
100112336 et 9007884005
100112337 et 9007885005
Bradford White
Bradford White
* Comprend la veilleuse et le joint de la chambre de combustion.
AOSmith
AOSmith
34-00013EF—03 2
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