Digital Zeus™ HVAC Tool & Instruments Journal

Operating Principles and Troubleshooting of Honeywell® SmartValve™

Operating Principles and Troubleshooting of Honeywell Smart Valve gas control systems for residential type gas burning equipment.

Let’s start with the Operating Sequence.

The operating sequence of Smart Valve gas ignition and control systems is very similar to the older style, intermittent ignition systems which incorporate remotely mounted spark ignition modules. Those older systems use a 12,000 to18, 000 DC voltage source for ignition of the pilot gas. The Smart Valve system uses a 24 VAC powered hot surface pilot gas igniter to ignite the pilot gas. The main gas is ignited in both instances by a pilot gas burner.

The Smart Valve system is self-contained, thus eliminating the need for a separately mounted ignition source, usually in the furnace or boiler vestibule.

Starting with a call for heat from the thermostat, the circuit usually (not always) will be completed to the R and W terminals located on an Electronic Fan Timer (EFT).

Read This Article and More on the SmartValve™ and the Supco® SmarTester™ at HVAC PROTech.com® http://hvacprotech.forumwise.com/hvacprotech-thread4542.html