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Gas Valves

Rooftoop

QuestionAnswer
The Function of Gas Regulator To Reduce, Adjust, Maintain gas pressure to the gas valve from the gas meter
Gas Regulator Pressure should be approximately 7" W.C at the inlet when the furnace is operating
The Furnace nameplate of gas regulator will list Maximum 13.5" W.C and minimum 4.5" W.C proper firing
The regulator could be installed on manifold 1) Upstream of the valve 2) Outside the cabinet 3) incorporated in the valve
Regulator Pressure Adjustment To change pressure adjustment: clockwise to increas and counter clockwise to decrease
Gas Valves Types 1) Solenoid 2) Diaphragm 3) Heat-motor--Controlled 4) Automatic Combination (Non-100% shut off valves, 100% shut off valves, Redundant, Two stage redundant Valves
Redundant Gas Valve Two or more Automatic valves in series
Safety code requires that all furnace manufacture after 1989 to have 100% shut off valves
Redundant Gas Valve are used 1) Pilot 2) Automatic re-ignition pilot 3) Direct burner ignition systems
Redundant means Two fully automatic valves in series and wired in parallel
Non-100% shut off valves combinations If the pilot goes out the main gas burner is turned off, pilot gas is on. Not legal after 1989
100% shut off valves combinations Pilot and Main gas shut off if the pilot goes out, use thermocouple. Two Valves in series: 1) Safety gas valve 2) Main gas valve
Direct Burner Ignition Gas Valve 1) Pilot connection is blocked 2) T-stat calls for heat 3) Electronic module or IFC energizes both first and second automatic valve solenoids at ignition source 4) Gas flows Main burner & ignite 4 to 12 s. 5) Once burner is lit & proved, furnace will run
Gas Smart Valve Gas valve & Electronic control in one unit, 24 volt HSI to light the pilot, The pilot lights main burner, Continuous trial, Once ignition take place: HSI denergized & the fan timer in module is energized
Gas Valve Troubleshooting Turn of the power, set t-stat to heat. Ohming and Voltage check at Gas Valve.
Created by: toolegit
 

 



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