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WT8840
Trade Water Heater Controls
APPLICATION
The WT8840 Water Heater Control is designed for use
in Standing Pilot applications using an immersion
well for water temperature sensing. All models of
WT8840 include an integrated NTC temperature
sensor.
The WT8840 is powered from a thermopile heated by
the standing pilot flame. CS8840 pilot assemblies are
designed for use with this control.
The immersion well for sensing water temperature
has matched NTC thermistor sensors. These sensors
provide the fail-safe mechanism through which the
WT8840 can provide both accurate water
temperature control as well as water temperature
limit (Temperature Cut-Out [TCO]) function.
Trade Service Part
WT8840A1000
WT8840A1500
WT8840B1000
WT8840B1500
SPECIFICATIONS
IMPORTANT
WT8840 controls provide direct replacement
only.
Pressure Regulator: The outlet pressure regulator
setting is shown on the product label.
Replaces
WV8840A1000
WV8840A1001
WV8840A1050
WV8840A1051
WV8840B1042
WV8840B1109
WV8840B1110
WV8840B1059
WV8840B1117
WV8840B1118
INSTALLATION INSTRUCTIONS
Inlet Pressure Range:
See appliance rating plate for inlet pressure 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.
Ambient Temperature Range: 32 to 150 °F
(0 to 66 °C)
Operating Range: 0 to 150 °F (-18 to 66 °C)*
*Valve will operate at 0°F (-18°C) but valve
characteristics can not be guaranteed until
ambient temperature reaches 32°F (0°C).
Storage Range: -40 to 150 °F (-40 to 66 °C)
Humidity: 95% non-condensing at 104 °F (40 °C)
Approvals:
This device is certified by Canadian Standards
Association (CSA) to the following standards:
ANSI Z21.20
ANSI Z21.23
ANSI Z21.78
ANSI Z21.87
CAN/CSA-C22.2 No. 199-M89
CAN1-6.6-M78
CSA 4.6
CSA 6.20
Accessory Parts:
Pilot Assembly CS8840
34-00013EF-01
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Table of Contents
Troubleshooting
Related Manuals for Honeywell WT8840
Summary of Contents for Honeywell WT8840
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Page 1: Installation Instructions
Inlet Pressure Range: See appliance rating plate for inlet pressure range recommendation. The WT8840 Water Heater Control is designed for use 0.5 PSI (14.0 in. w.c.) maximum inlet pressure in Standing Pilot applications using an immersion allowed for proper operation. - Page 2 High Humidity or Dripping Water M36122 Dripping water can cause the control to fail. Never Fig. 1. Typical capacity curve for WT8840 family install an appliance where water can drip on the water heater control system. control. In addition, high ambient humidity can cause the control to corrode and fail.
- Page 3 Always use a direct replacement sensor DROP TUBING assembly when replacing a temperature HORIZONTAL sensor. SUPPLY Location The WT8840 is mounted on the outside of the water heater tank. See Fig. 2. RISER 3 IN. (76 MM) MINIMUM MOUNTING WARNING WELL ASSEMBLY EXPLOSION HAZARD.
- Page 4 WT8840 TRADE WATER HEATER CONTROLS Wiring IGNITION Follow the wiring instructions furnished by the IMPERFECT SYSTEM THREADS CONTROL appliance manufacturer, if available, or use the general instructions provided below. When these instructions differ from the appliance manufacturer, PIPE follow the appliance manufacturer instructions. Make sure wiring insulation does not get cut by sharp edges.
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Page 5: Troubleshooting
Can damage electrical components in the MAINTENANCE WT8840. Do not spray soap and water solution on the WT8840 housing. Do not use an excessive WARNING amount of soap and water to perform the gas leak test. Fire or Explosion Hazard. Can cause severe injury, death or property damage. - Page 6 WT8840 TRADE WATER HEATER CONTROLS When the solid light is present, the pilot and 4. Status indicator light should be in normal mode main valve will not hold. When the status (1 flash) with the knob in the PILOT position.
- Page 7 WT8840 TRADE WATER HEATER CONTROLS Troubleshooting Without Status Indicator Assistance Follow diagram in Fig. 6. TROUBLESHOOTING GUIDE WITHOUT STATUS LIGHT TURN DEVICE KNOB FROM OFF TO CHECK: PILOT, PRESS DOWN KNOB AND HOLD, • INLET PRESSURE LIGHT PILOT BY DEPRESSING PIEZO •...
- Page 8 WT8840 TRADE WATER HEATER CONTROLS INSTRUCTIONS TO THE STOP: READ THE HOMEOWNER WARNINGS ABOVE. If the appliance does not turn on when the setpoint knob is set several degrees above the previous WARNING temperature, follow these instructions: Fire or Explosion Hazard.