Atwood Mobile Products Water Heater Water Heater Exchanger User Manual

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8
Gas Thermostat Controls and Pilot Assemblies
Only two makes of gas controls have been used on our pilot model water heaters. They are the Robertshaw
“Unitrol” and White Rodger (formerly Jade or ITT).
The Robertshaw control came in two different sizes of gas inlets: 3/8˝ inverted flare and 3/8˝ N.P.T. The
inverted inlet control is no longer available. Therefore, the water heater gas line connection will have to be
modified to 3/8˝ N.P.T. in order to use the current Robertshaw control.
The White Rodger control is the valve we are using on all production today. Formerly it had a 3/8˝ N.P.T.
inlet. Now it is only available with a 1/4˝ inlet. This improvement eliminates the adapter fitting into the control
allowing the use of only a single 45 degree elbow (3/8˝ flare x 1/4˝ N.P.T.). If you are replacing a current 1/4˝
inlet model control with a earlier model 3/8˝ inlet control you may have in stock, the adapter fitting that
mates the control and elbow fitting is still available.
Although the controls appear quite different in size, the White Rodger and Robertshaw control are
interchangeable. Their manifolds will both line up with the burner tube properly.
Both controls have a port to test gas pressure through the valve. This can be accomplished by removing the
cover screw and inserting a 1/8” pipe nipple. After attaching your manometer hose to this fitting, the
manometer should register 10” W.C. through the valve while it is operating.
There are two main pilot assemblies that you will encounter in the field.
The first is an earlier model Robertshaw pilot assembly with a 1/4˝ pilot gas line that mounted on the left
side of the main burner.
The current pilot is the Jade assembly with a 1/8˝ pilot gas line and it mounts on the right side of the main
burner.
The Robertshaw pilot is no longer available and the Jade pilot must be substituted. When installing a Jade
assembly in place of a Robertshaw assembly, if there is not a location on the right side of the main burner to
mount the Jade pilot, a new burner that has the proper mounting holes will have to be purchased.
Note: The size of the gas line does not have
any affect on the size of the pilot flame. Only
the gas pressure and pilot orifice regulate the
height of the pilot flame.
ROBERTSHAW “UNITROL”
• 3/8˝ Inverted inlet
3/8˝ N.P.T. outlet
(no longer available)
• 3/8˝ N.P.T. inlet
3/8˝ N.P.T. outlet
WHITE RODGERS (JADE, ITT)
• 3/8˝ N.P.T. outlet
(no longer available)
• 1/4˝ N.P.T. inlet
3/8˝ N.P.T. outlet
(replaces all Robertshaw
and Jade controls)
JADE ROBERTSHAW
(obsolete, replace with Jade)

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