Robertshaw Unitrol, Jaderobertshaw | Atwood Mobile Products 94605

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.

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

There are two main pilot assemblies that you will encounter in the field.

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)

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.

JADEROBERTSHAW

(obsolete, replace with Jade)

94605 specifications

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