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View Full Version : How to wire a Honeywell RTHL3550 from a Janitrol HPT 18-60


Dave from OBX
Nov 7, 2013, 05:56 PM
I need the correct wiring from a Janitrol HPT 18-60 to a Honeywell RTHL3550. I have a heat pump with an emergency heat strip.

The Janitrol wiring is as follows:
Y=YELLOW
G=GREEN
R=RED
O=ORANGE
W2=WHITE
E=SILVER (GRAY)
C=BLUE
Need to know corresponding terminals on the Honeywell
they are as follows:
L=
AUX/E=
G=
O/B=
Y=
R=
Rc=
Thanks,
Dave from OBX

Grady White
Nov 7, 2013, 08:46 PM
R=Red
Y=Yellow
G=Green
O/B=Orange
Aux/E=White & Silver

I'm surprised there is no "C" (common) terminal on the new stat.

I searched Honeywell's site for an RTHL 3550 without success. Are you sure the model # is correct?

Dave from OBX
Nov 8, 2013, 07:40 AM
R=Red
Y=Yellow
G=Green
O/B=Orange
Aux/E=White & Silver

I'm surprised there is no "C" (common) terminal on the new stat.

I searched Honeywell's site for an RTHL 3550 without success. Are you sure the model # is correct?

There is no C on the Honeywell. If you Google Honeywell RTHL3550 with no space it will come up. Thanks