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WT8840 TRADE WATER HEATER CONTROLS

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN  55422

customer.honeywell.com

® U.S. Registered Trademark
© 2016 Honeywell International Inc.
34-00013EF—01    M.S.  05-16
Printed in United States

INSTRUCTIONS TO THE 
HOMEOWNER

WARNING

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.

WARNING

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 device knob to OFF. Turn off the gas supply 
to the appliance. Appliance will completely shut 
off. 

2.

Follow the procedure in the Instructions to the 
Homeowner section above to resume normal 
operation.

Содержание WT8840

Страница 1: ...ressure range recommendation 0 5 PSI 14 0 in w c maximum inlet pressure allowed for proper operation Body Pattern 90 degrees with 1 2 in inlet and 1 2 in inverted flare outlet Mounting Mounting in upright position only Control Input Voltage Minimum 350 mV dc open circuit Voltage Maximum 850 mV dc open circuit Capacity See Table 1 Regulation Range Natural Gas Minimum 30 000 Btuh Maximum 85 000 Btuh...

Страница 2: ...ded in air as in some industrial or agricultural applications protect the control with a cover Dust or Grease Accumulation Heavy accumulations of dust or grease can cause the control to malfunction Where dust or grease can be a problem provide covers for the control to limit contamination Heat Excessively high temperature can damage the control Make sure the maximum ambient temperature at the cont...

Страница 3: ...es 1 Use a new properly reamed pipe free from chips If tubing is used make sure the ends are square deburred and clean All tubing bends must be smooth and without deformation 2 Ensure that gas supply is turned off 3 Run pipe or tubing to the water heater control If tubing is used obtain a tube to pipe coupling to connect the tubing to the control 4 Install a sediment trap in the supply line to the...

Страница 4: ...feet of 1 2 in pipe with 5 in w c pressure 2 Depress the piezo igniter to light the pilot flame and hold the knob in until the status indicator starts to blink approximately 30 seconds indicating pilot now being held by electronics NOTE LED should blink once every three seconds If not check the error codes in Table 3 3 Release the knob and turn to the desired temperature setting The burner will co...

Страница 5: ...s 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 out...

Страница 6: ...Normal operatio n No action required 1 flash every 3 seconds Not an error indicates the electronics is holding the Pilot Valve open and the Main Valve closed 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 Strobe every 3 seconds Not an error indicates call for heat during normal operation Main valve o...

Страница 7: ...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 CHECK WIRING OF THERMOPILE LEADS FLAME COVERAGE OF THERMOPILE THERMOPILE OUTPUT IS TOO LOW RUN THERMOPILE OUTPUT CHECK STATUS LIGHT SHOULD FLASH AFTER 1 MINUTE LED WILL FLASH NORMAL SINGLE BLINK RELEASE THE DEVICE KNOB PILOT SHOULD R...

Страница 8: ... 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 ...

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