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VT8800/WT8800
Water Heater Controls
APPLICATION
The VT8800/WT8800 Water Heater Control System is a
modular control package which combines standing pilot,
gas flow control, temperature sensing and setpoint
adjustment features. These controls were designed
specifically for gas-fired atmospheric hot water tank
heating applications. The ignition source is a standing
pilot lighting the main burner flame.
VT8800/WT8800 Controls provide high temperature
appliance shutdown and all gas ignition safety functions,
controlling gas flow, ignition source and water
temperature.
The control uses two temperature sensors and a special
control algorithm to operate the main valve, accordingly.
The specific application of the VT8800/WT8800 System
is the responsibility of the appliance manufacturer. This
specification refers to the valve (VT8800) and the control
(WT8800).
SPECIFICATIONS
IMPORTANT
VT8800/WT8800 Controls provide direct
replacement only.
Body Pattern: VT8800: 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.
Conversion: Use conversion factors in Table 2 to
convert capacities for other gases.
INSTALLATION INSTRUCTIONS
Regulation Range:
VT8800 with 1/2 in. NPT inlet and 1/2 in. Inverted Flare
Outlet:
Natural Gas:
Minimum: 30,000 Btuh.
Maximum: 85,000 Btuh.
LP Gas:
Minimum: 40,000 Btuh.
Maximum: 85,000 Btuh.
Ambient Temperature Range:
32°F to 140°F (0°C to 60°C)
Approvals:
Canadian Standards Association (CSA): Number
158158-1482778.
Dimensions:
See Fig. 1.
PLANNING THE INSTALLATION
WARNING
Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.
Follow these warnings exactly:
1. Plan the installation as outlined below
2. Plan for frequent maintenance as described in
the Maintenance section.
3. Review the following conditions that can apply
to your specific installation and take the
precautionary steps provided.
Frequent Cycling
This control is designed for use on appliances that
typically cycle three to five times a day. In year-round
applications with greater cycling rates of 10,000 cycles
annually, the control can wear out more quickly. Perform
a monthly checkout.
69-1731
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Table of Contents
Summary of Contents for Honeywell VT8800
- Page 1 VT8800/WT8800 Water Heater Controls INSTALLATION INSTRUCTIONS APPLICATION Regulation Range: VT8800 with 1/2 in. NPT inlet and 1/2 in. Inverted Flare Outlet: The VT8800/WT8800 Water Heater Control System is a Natural Gas: modular control package which combines standing pilot, Minimum: 30,000 Btuh.
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Page 2: Corrosive Chemicals
1-1/2 (38) 4-3/4 (121) 1/16 M23034 Fig. 1. VT8800/WT8800 dimensions in in. (mm). Water or Steam Cleaning Corrosive Chemicals If a control gets wet, replace it. If the appliance is likely to Corrosive chemicals can attack the control, eventually be cleaned with water or steam, protect (cover) the causing a failure. -
Page 3: Installation
, 0.64 specific gravity natural gas at 0.25 kPa pressure drop). Valves are guaranteed at 77 percent of the rating. Fig. 2. Typical capacity curve for VT8800 Family Water Heater Control System. Table 2. Gas Capacity Conversion Factor. Gas (Btu/ft... -
Page 4: Connect Gas Supply
Install Control to Water Tank M23036 1. To install the water heater control, screw the plate Fig. 3. Mounting the VT8800 on the water heater tank. bracket into the spud until the bracket is square. Use a maximum torque of 50 ft. lb (two-piece design only). -
Page 5: Explosion Hazard
VT8800/WT8800 WATER HEATER CONTROLS 6. Connect the pipe to the water heater control inlet and outlet. Use a wrench on the square end of the DROP PIPED water heater control. Maximum torque on the inlet is HORIZONTAL 40 ft. lb.; maximum torque on the outlet is 25 ft.lb. - Page 6 VT8800/WT8800. Do not spray soap and water solution on the Fill Tank VT8800/WT8800 housing. Do not use an excessive amount of soap and water to perform Refer to the appliance manufacturer instructions to fill the the gas leak test.
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Page 7: Troubleshooting
VT8800/WT8800 WATER HEATER CONTROLS Check and adjust Gas Input and Burner 1. Cycling frequency. Appliances that may cycle 10,000 times annually should be checked monthly. Ignition 2. Intermittent use. Appliances that are used seasonally should be checked before shutdown and again before the next use. - Page 8 VT8800/WT8800 WATER HEATER CONTROLS pilot and main valve will not hold. When the status 5. In the event of multiple failure codes, the next indicator goes out, the user can restart the system. failure code follows the previous failure code by (Approximate shutdown time is one minute.)
- Page 9 VT8800/WT8800 WATER HEATER CONTROLS TROUBLESHOOTING GUIDE WITHOUT STATUS LIGHT CHECK: TURN DEVICE KNOB FROM OFF TO • INLET PRESSURE PILOT, PRESS DOWN KNOB AND HOLD, • MAKE SURE AIR IS BLED OUT OF SYSTEM LIGHT PILOT BY DEPRESSING PIEZO • PIEZO SPARKING TO THERMOPILE IGNITION BUTTON, PILOT SHOULD •...
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Page 10: Turning Off The Appliance
VT8800/WT8800 WATER HEATER CONTROLS 3. Wait five minutes to clear out any unburned gas. If WARNING you then smell gas, STOP! Follow step 1 in the warning above. If you DO NOT smell gas, continue Scalding Hazard. with the next step. - Page 11 69-1731...
- Page 12 Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2005 Honeywell International Inc. 69-1731 S.A. 10-05...