Stack control

Old 02-18-08, 08:50 AM
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Stack control

My mother has an old furnace. The stack control Sid Harvey RA816 R4R if giving her a problem. The old control has only 3 places to connect wires:

(3) Motor - which has 2 wires hooked to it.
(2) Ignition - Which has 2 wires hooked to it.
(1) Hot = Which has 1 wire hooked to it.

The new controller Honeywell Model RA117A1047 has an extra spot for an L2 connection

Can I use the RA117 to replace the RA816

Last edited by TimH; 02-18-08 at 10:06 AM.
Old 02-18-08, 10:11 AM
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In most furnace wiring diagrams, L1 id used to describe/identify the "hot" wire going back to the breaker box, while L2 is the neutral wire going back to the breaker box.

I'm guessing that the old vent damper used 24 VAC to power the motor and the ignition. What's the voltage of the "hot" wire, and what is that used for?

Have you read the instructions carefully to identify the purposes for the various connections and how they should be used and wired up?
Old 02-18-08, 10:26 AM
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Yes you can The RA116A is a intermittent ignition
The RA117A --Flame or power failure is followed by scavenging period of about one minute and one attempt to restart-- then lock out occurs if flame is not established.

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