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Old 03-03-2013, 08:17 PM   #1
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Thermostat - Old Heat Pump to New Programmable


I have a Heat Pump in a condominium. I just changed the old Mercury Honeywell Heat Pump Thermostat similar to T841A or T841A1241 to new Honeywell Programmable Thermostat model RTHL2410C.

The Heat Pump / Air Conditioning unit is
Model No: 49AQ018310BU
Serial No: 2589A15275

I could wire everything but I am confused with additional wires and Heat is not coming on. The old thermostat has Em Heat switch but the new thermostat does not have something like that. The thermostat is working in Cool mode meaning the outside condenser fan is working and the inside blower fan works. Auto/Fan is working as desired, that is the inside blower fan rotates when switched to Fan Mode. Here are the details,

Old Thermostat Wiring
W1 light blue
W2 white
X1 black
G green
Y yellow
R red
O orange
E brown
B vacant

Where do I connect the three additional wires,
W1 blue wire
X1 black wire
E brown wire

I connected from old to new T,

- R to Red wire
- shorted R and Rc with jumper
- G to Green wire
- Y to Yellow wire
- W to White wire
- O to Orange wire

The new thermostat has switch o back, Gas/Oil or Electric/Heat Pump. I made sure to slide to Electric/Heat Pump.

The old T had settings,
EM HEAT -- HEAT -- OFF -- COOL

Another slide witch,
FAN -- AUTO -- ON

LEDs,
Red LED - EM HEAT
Green LED - AUX HEAT

The new thermostat from Honeywell Model RTHL2510 has following terminals,
B -
O -
G -
Y -
W/AUX -
R -
Rc

The manual says, "Wiring for Heat Pumps with Auxiliary or backup heat only"

1. Leave the metal jumper between R & Rc.
2. If your old thermostat had separate O and B wires, wrap B wire in electrical tape and do not connect.
3. If your old thermostat had Y1, W1 and W2 wires, stop now and contact a qualified technician for help.
4. Do not use C or X wire. Do not use B wire if you already have O wire.
5. If your old thermostat had E and Aux wires, connect both wires to Aux terminal.


Where do I connect the three additional wires,
W1 blue wire
X1 black wire
E brown wire ?
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