White-Rodgers Gas Furnace Valves
Education You Can Build On
When To Replace A Gas Valve?
• The valve should be replaced if any of the following occur:
– The outlet pressure remains above the set point or fluctuates
• NOTE: The manifold regulation should stabilize after about 20 seconds and
stay within +/- 10% of the set pressure setting
– The regulation setting cannot be adjusted
– The valve will not open to allow main gas flow
– The gas valve has been subjected to water flooding
•
NOTE: When servicing a gas furnace it is important that the inlet and
the outlet pressures be checked with an accurate pressure gauge
– You cannot visually look at a main burner flame to determine if the
pressures are within the manufacturers specifications
– Always check the gas valve with a water and soap bubble solution after
servicing to ensure there are no leaks
Selection Criteria
Questions
What is the Ignition
Source?
Options
• Direct Burner Ignition
• Direct Spark Ignition
• Hot Surface Ignition
• Proven Pilot / Intermittent Pilot
• Standing Pilot
What is the Furnace
Input / Valve Rating?
• Look at the rating plate on the furnace
What are the opening
characteristics?
• Opening Curve
• NOTE: All White-Rodgers Universal Gas Valves come
with Nat. to L.P regulator spring conversion kit and
reducing bushings for adapting to pipe size
• Fast/Standard Open or Slow
• Stages
• Single Stage or 2 Stage
Application by Ignition Source
Direct Burner Ignition
W-R Valve
Hot Surface
Ignition (HSI)
Direct Spark
Ignition (DSI)
Proven /
Intermittent
Pilot
36H or 36J
36H or 36J
36H
Resistive element that
heats up to light the gas
with direct or indirect
flame sensor
Ground electrode, with
spark electrode flame
sensor
Standing /
Continuous
Pilot
36C
Ignition
Source
Majority of
Usage current furnaces
Selected
applications
Pilot burner to ground,
with a spark electrode
and flame sensor
A traditional pilot burner
with a thermocouple no spark electrode or
flame sensor
Mostly rooftop
applications
No longer used in
OEM production
Rated Valve Capacity
Pressure Drop:
Range of Regulation:
Pressure differential is the agency rated amount of
gas (BTU’s) that can pass through the gas valve
based on inlet and outlet pipe size.
Is the minimum and maximum BTU/Hr capacity of
the valve to maintain regulation pressure settings.
Pressure Drop Capacity
W-R
Valve
Gas Flow (KBTU/HR)
250
Pipe
Size
200
150
36J
100
36H
50
0
0.4
0.6
0.8 1.0 1.2 1.4 1.6 1.8
Differential Pressure (In. W.C.)
2.0
36C
Range of Regulation
KBTU/HR
(Min to Max)
N.G.
L.P.
½x½
40 to 210
60 to 340
½x¾
30 to 290
81 to 648
¾x¾
50 to 400
81 to 648
½x¾
30 to 290
30 to 469
¾x¾
50 to 400
50 to 648
Application By Opening Characteristics
Fast Open
Slow Open
2-Stg Fast Open
2-Stg Slow Open
36J22
36J24
36J54
36J55
36H32
36H33
36H64
36H65
36C03
Fast Open
Fast rise to full outlet
pressure upon
energizing the valve
Slow Open
Slow increase of gas
to full outlet pressure
for smoother ignition
Two-Stage Open
Low pressure 1st fire stage and then full outlet
pressure on a call for 2nd Stage Heat
Can be fast or slow open on both stages
Note: These are Typical Family Model Numbers.
Verify Specific Type Numbers Before Replacing A Control.
Universal Valves You Should Not Be Without
Model
Number
36J22-214
36J24-214*
36J54-214
36J55-214*
Ignition
Source
Direct
Burner
Ignition
(HSI / DSI)
N.G.
Capacity
140,000
L.P.
Capacity
226,800
Pipe Size
½x½
Opening
Curve
Stages
Fast
1
Slow
1
Fast
2
Slow
2
* 36J valve is offered in a -614 Version that gives you a 90° Bottom Outlet—Primarily used in Carrier Furnaces
36H32-304
36H32-423
36H33-412
36H64-463
260,000
Direct
Burner
Ignition
Or Proven
Pilot
300,000
421,000
486,000
½x¾
¾x¾
36H65-401
36C03-300
36C03-433
Standing
Pilot
Fast
1
Fast
1
Slow
1
Fast
2
Slow
2
230,000
372,600
½x¾
Fast
1
280,000
453,600
¾x¾
Fast
1
98% of Furnaces manufactured in the last 10 years can
be repaired using the “J” valves listed above!