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Old 09-30-2012, 10:50 AM   #1
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Lux thermostat help


I am installing the Lux LX9600TS with an American Standard heat pump.

The cooling mode works fine, but I can not get the heating mode to work. The unit was previously operating with a Honeywell thermostat, with an orange wire connected to a terminal labelled "O/B" on the thermostat.

I have the wires hooked up as following:
Green to "G"
Orange to "O"
Yellow to "Y"
Red to "RC"
White to "W2"
Brown to "C"
Jumper from "RC" to "RH"
Jumper from "Y" to "W"

Gas/Electric switch "Down" (Which should be electric based on what is printed on the circuitboard)

Switch 1 "On"
2-6 'off'
7 'on'
8 'off'

Additionally, the unit makes a humming sound whenever the backlight is on... is this normal?
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Old 09-30-2012, 12:06 PM   #2
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Lux thermostat help


Did you allow 5 minutes for the heat to start?
Does the fan run in heat mode?

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Old 09-30-2012, 12:32 PM   #3
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Lux thermostat help


Yes, unit sat for > 15 minutes with no response.
The fan does NOT turn on in heat mode.
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Old 09-30-2012, 01:40 PM   #4
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Lux thermostat help


Move the gas/elec switch up.
The manual states that down = gas.
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Old 09-30-2012, 02:02 PM   #5
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Move the gas/elec switch up.
The manual states that down = gas.
Tried that as well, still no response. Thought maybe the instruction was backward as it contradicts what is printed on the circuit board for that switch, but it doesn't work either way...
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Old 09-30-2012, 02:06 PM   #6
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Lux thermostat help


return the Lux and get a Honeywell thermostat
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Old 09-30-2012, 02:08 PM   #7
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Quote:
Originally Posted by hvactech126 View Post
return the Lux and get a Honeywell thermostat
Why? That doesn't help much...
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Old 09-30-2012, 02:17 PM   #8
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Because Lux is not a good thermostat manufacturer. Test your system operation by touching red and green together to make sure your blower comes on.
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Old 09-30-2012, 02:32 PM   #9
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Quote:
Originally Posted by hvactech126 View Post
Because Lux is not a good thermostat manufacturer. Test your system operation by touching red and green together to make sure your blower comes on.
Yes, the fan does turn on with that.

The unit works fine w/ AC or even just the fan switch on, but does nothing in heat mode...
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Old 09-30-2012, 02:38 PM   #10
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bad thermostat............... again, buy a honeywell.
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Old 09-30-2012, 07:26 PM   #11
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Lux thermostat help


did you bypass thermostat for heat mode at control board to see if it will fire up... this will tell you if stat is problem...
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Old 09-30-2012, 07:34 PM   #12
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Ben, it is a heat pump so there will be no "firing up".

Op, if you want to bypass the thermostat to check for proper operation you would need to jumper R to Y and G. This will simulate a call for first stage heating (heat pump in heating mode)
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Old 09-30-2012, 07:38 PM   #13
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Quote:
Originally Posted by hvactech126 View Post
Ben, it is a heat pump so there will be no "firing up".

Op, if you want to bypass the thermostat to check for proper operation you would need to jumper R to Y and G. This will simulate a call for first stage heating (heat pump in heating mode)
helps to read all before opening mouth...my bad thanks.... out here in pa used to furnaces firing up....not going into heat mode......

Last edited by ben's plumbing; 09-30-2012 at 07:54 PM.
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