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Bradford
White gas water heater timer Gas water heater timer requires 3 things: 1. The "ICON gas valve"/ Honeywell gas control valve 2. 24-volt AC "Accessory Module that powers available features. 3. The Programmable Setback Controller which is a 4-time-per-day, 7-day a week gas water heater timer |
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Discontinued? Interface with the Honeywell gas control valve This Bradford White setback controller/ no longer available |
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Current
product Current Bradford White product: Programmable setback controller/ for commercial gas water heater timer 7-day programmable timer 2-on-off per week/ works with Bradford White Honeywell gas control valve Temperature control Diagnostic codes programmable setback control Resources: Control system sell sheet Manual Manual Programmable gas water heater manual |
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ICON gas valve/ Honeywell gas control valve Resources: Error codes Error codes/ troubleshooting To reset gas control, rotate dial to OFF, wait 10 minutes for gas to clear. Then relight. State/ AO Smith: Error codes/ service manual Bradford White: Error code, service manuals Troubleshoot gas control valves Icon gas control error codes Full service manual Honeywell power vent gas valve error codes Power vent service manual Bradford White and FVIR |
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Honeywell
and White Rodgers and all other Electronic
controls are powered by a thermopile instead of thermocouple. Thermopile produces more current than thermocouple, enabling use of circuit board that controls the gas supply and manifold supply electromagnets inside gas control valve, and records status and error events. The thermopile is located inside combustion chamber next to pilot light. Heat from pilot flame creates current in thermopile. Two wires, red and white, carry current from thermopile, that must pass through a thermal cut off (TCO) locted on front of combustion chamber before plugging into front of gas control valve where they connect to circuit board. The thermostat on back of gas control is a variable resistor with maximum cut off (ECO) at 180°F that inteprets temperature change as resistance. When temperature drops below thermostat set point, the circuit board activates the manifold electromagnet, releasing gas to burner. Troubleshoot etc How to replace water heater gas valve How to light gas water heater |
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Resources: Adjust temp on Honeywell gas valve Icon gas control valve error codes To reset gas control, rotate dial to OFF, wait 10 minutes for gas to clear. Then relight. How to light water heater How to light water heater/ pdf Bradford White Service manual More Bradford White service manuals How to rerplace gas control valves How to test gas control valve How to light Honeywell gas control |
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Temperature settings Residential range 55-160°, ECO trip at 180° Commercial range 75-180°, ECO trip at 200° |
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Resources: How to light water heater How to light water heater/ pdf |
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Icon
gas valve overview Resources: How to test and replace gas control valve Step-by-step how to replace honeywell gas control valve |
 Larger imageDisassemble Icon gas control Temperature sensor, igniter and gas control can be replaced without draining tank. Backplate remains installed. How to replace honeywell gas control valve How to replace Honeywell gas control. 1) Unplug wires and disconnect piezo igniter 2) Remove 1 screw. On front bottom below plastic cover is 1 screw located on left side. 3) Remove platic cover. Tip plastic cover out from bottom, and then pull straight back toward you and cover snaps off. Caution: plastic cover is connected to body with 3-strand yellow-orange-white wire. 4) Disconnect yellow-orange-white wire. Wire is plugged into circuit board on plastic cover. Grasp wire and pull upward to unplug wire from circuit board.. 5) Remove valve body from backplate. There are 2 plastic clips that hold valve body to backplate. These are located at bottom on right and left side. Use screwdriver to push 1 clip down while while using another screwdriver to pry valve body outward. Then use screwdriver to push down other clip to release valve body. |
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 Larger image COM port/ communication port connects on RX TX GND located at bottom of image GND is ground, other two contacts are unknown WV8840 communication port Image shows front and back of circuit board flipped in photoshop so front and back can be laid over top of the other. I cannot find a spec sheet showing model numbers, or differences between models. Circuit board is powered by current generated by heating thermistor. E1 and E2 in lower right corner connect to thermistor. Bradford White Service manual The Bradford White gas water heater timer connects to COM port on Honeywell gas control valve thermostat. Timer is for specific models only. I do not know how the 24volts interfaces with the RX TX GRD communication terminals on the gas control valve thermostat. April 2020: Years ago, Bradford white had a setback controller that interfaced with the COM port It was powered by 24 V transformer .... meaning that the com port is NOT powered by the thermopile that powers the circuit board and gas water heater operation. The setback controller was able to disable gas valve until a setpoint was reached ... so I assume all it did was turn off circuit to gas valve until thermostat probe signaled that a lower temperature was reached. It’s too bad that folks did not buy the discontinued setback controller so today's com port mystery could be solved. Other than that information, some guy sent me a pdf that makes no sense to me honeywell-gas-control-communication-port.pdf  Larger image Second example of circuit board shows numerous differences between the two boards. Basic layout appears the same, but the circuit board has different type of connection points for relays |
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 Larger imageInside Honeywell gas control valve showing 2 solenoids that are activated by the circuit board. The circuit board fits down over top of two pins that stick up. The circuit board receives power from thermopile which produces small current when heated by pilot light. The circuit board uses the current to intepret input from thermostat, ECO, and temperature knob to control supply of gas to water heater, and issue LED status codes. Every circuit needs at least 2 wires ... the solenoids cannot be wired in series for the same reason light bulbs are not wired in series ... because of voltage drop. So the gas valve body must be the return wire, just like a car body is the return wire for battery. On the other side of solenoids is a ruber diaphram. Without knowing more, my guess is that the gas sits on inside two chambers formed by the rubber membrane ... ... and the solenoids push against the rubber membrane to open and close gas supply to pilot tube and manifold tube... There are two springs that sit against the rubber diaphram. I'm guessing the springs probably keep the rubber in place. The gas probably passes through orifices to get into the pilot and manifold chambers .... and the orifices are probably customized to fit different types of gas and pressures... This shows the need to keep end of gas supply line clean when installing ... and keep teflon tape or sealant at least 1 thread away from end of pipe to ensure nothing gets inside the gas control valve.... also shows why the sediment trap on gas line is needed, and why air and water in the gas line can cause problems, and why low gas pressure can cause pilot to fail. |
 Service manual (10Mb) Service manual 2 |
This Honeywell gas valve
if different than the Honeywell WV and WT series shown above. The WV WT series are used only for atmospheric heaters, and the gas valve is powered by small current produced by thermopile. The Honeywell gas control valve shown to left does not have a COM port among other differences with the WV and WT series gas valves discussed above ... instead this valve is used on Blower assisted water heaters ... such as Power Vent and Flue dampered heaters. The heater operation and gas valve are powered by plugging water heater into 120 volt outlet, and the heater does not have a thermopile like atmospheric heaters do. There are various models ... powered by 24V AC transformer or 120V depending on heater and brand of heater ... for example Bradford flue damper has 120V with resettable ECO, while AO Smith and Rheem have 24 volt. Range 90-160°, combustion chamber TCO trips at 188°, ECO trips at 188° Resource: How to troubleshoot power vent Review AO Smith Flue Damper series |
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White Rodgers Intellivent White Rodgers Intellivent is used on power vent models Range 80-150°, Error flashes if water temperature reaches 160°, ECO trips 180° Resources: More gas control valves Troubleshoot power vent water heater |
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Resources: Troubleshoot gas control valves / service manuals/ error codes replacement steps |
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