Honeywell VR8300A3500 Single Stage Heat Gas Valve to Ecobee3 with C wire


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Just picked up an Ecobee 3 and want to replace an older Honeywell thermostat. Right now, the current thermostat is using Rh & W, but I have additional wires to bring up the 24v for the Ecobee, so adding wires is not an issue.

Gas Hot water Furnace is a Burhnam, TT connection with 3 Honeywell Zone Valves, each with 4 wires.(2 Yellow and 2 Red) Below is a diagram of the current wiring. The Zone valves heat the hotwater pack, basement area and main house.

The Thermostat being replaced is the bottom right for House. I tied on the Ecobee into the 24V relay and was able to power the unit, but the W1 off the Ecobee into the Yellow lead (replaced existing Thermostat) on the house zone valve does not call for heat.

I'm not sure if the existing wiring is correct, but before I pull it apart, I'll see what you guys...

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Product Description

Honeywell VR8300A3500 Gas Valve. Combination gas control for use in 24 Vac, gas-fired, standing pilot appliances with capacities from 30 to 300 cfh.

• Controls include safety shutoff, manual valve, two automatic operators, pressure regulator and pilot adjustment.
• Compact size.
• Provide two automatic valves.
• Solenoid operated first automatic valve opens on thermostat call for heat; closes when call for heat ends.
• Diaphragm-operated second automatic valve opens under control of regulator; closes if gas or power supply is interrupted.
• Meets codes requiring dual safety shutoff.
• Natural to LP and LP to Natural conversion kits available for standard and slow opening gas valves.
• All adjustments, wiring connections and pilot outlet are accessible from top of control.
• Adjustable servo regulator effectively maintains almost constant gas output pressure under wide fluctuations in gas supply pressure.

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Trans Adriatic Pipeline AG (TAP) has selected Honeywell SRL of Italy for the engineering, procurement and installation of its SCADA (Supervisory Control and Data Acquisition) telecommunications and security systems, reads a message posted on the TAP website.

“The SCADA and security system will provide integrated, centralized and seamless monitoring and control along the entire 878-kilometer gas transportation system”, said the message. “All data will be transmitted back to the supervisory control center in the Pipeline Receiving Terminal (PRT) in southern Italy, overseeing the pipeline’s safe and sustainable operations”.

Ian Bradshaw, managing director at TAP, said that with this appointment, TAP had completed the award of all major strategic contracts for pipeline construction.

The SCADA telecommunications and security system is a key piece of equipment, which will ensure safe and effective pipeline operations, added Bradshaw.

TAP is a part of the...

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How to test gas control

Bradford White has a timer, or setback controller for this gas control valve
Read about Honeywell gas water heater timer
Error code/ troubleshoot/ service manual/ FVIR
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Reset gas control to see if it will work:

Rotate dial to OFF, wait 10 minutes for gas to clear.
Then relight. How to light water heater

Error codes
Steady flash means gas control working correctly, & pilot light ON
8 flashes and 3 flashes means replace gas control

This type gas control valve is powered by thermopile. Water heater does not have thermocouple. Thermopile is basically several thermocouples together. The result is more current, which is used to power small circuit board inside gas control valve. Result is error codes and...

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