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Old 06-28-2007, 09:41 PM   #1
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Princess Stove Robertshaw Regulator

I repiped all the propane lines. The good news is everything works. Except the oven. Tell me if I screwed up.

The Robertshaw control is a fine piece of engineering. It does not have an igniter, nor does it have an automatic gas shut off valve. It does have a pilot and a two stage burner. It modulates between high and low fire based on the setting of the thermostat and the heat in the oven, measured by a capillary bulb.

I had the capillary bulb in and out a few times while installing the range top and oven, but I never disconnected it from the valve. I think it looks ok.

The problem is the thermostat will not control. I have adjusted the low heat setting and adjusted the calibration, but now the temp just keeps rising until it hits 450F.

Do I take the valve apart and clean it? This regulator is so old it can be taken apart and cleaned by the user. Or is the capillary tube pinched? Can the capillary tube be replaced?

Third option, and my least favorite, would be a replacement valve. Any recommendations?
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Old 06-30-2007, 05:08 AM   #2
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Third option

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Originally Posted by markdoane
... but now the temp just keeps rising until it hits 450F.

... Or is the capillary tube pinched? Can the capillary tube be replaced? ...
The capillary bulb thermostat, as I recall, is a closed-loop pressure system. Once the trapped gas escapes or is blocked off, no control can occur.

The symptoms you listed sound like a bad capillary bulb/its associated plumbing. I think "replacement" is the fix.

Tom
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Old 06-30-2007, 07:22 AM   #3
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Thanks Tom,

I found an outstanding resource for antique gas stoves, and they both repair and sell replacement thermostats.

They haven't replied to my email yet. They're in Montclair, CA.

Have you ever replaced a capillary bulb? Does it require any special equipment?
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Old 07-01-2007, 12:10 PM   #4
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I have never replaced just the bulb itself. All of the thermostats that have come across my bench have been integrated units i.e. there was nothing independently replaceable. The bulb, its connecting line, and thermostat assembly were all replaced at once.

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