Thermo Amplifier

  • Ralley
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28 Apr 2020 17:58 - 28 Apr 2020 18:01 #1 by Ralley
Ralley created the topic: Thermo Amplifier
Does any have a part number for the Thermo amplifier for the rear air con. The LT i'm working on doesn't seem to have one.

Rob
Last Edit: 28 Apr 2020 18:01 by Ralley.

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28 Apr 2020 18:44 #2 by OKAPETE
OKAPETE replied the topic: Thermo Amplifier
Hi Rob. By Thermo Amplifier. ..Do you mean the TX valve?
Pete.

Chaplain. Won x One Chaplaincy.
AM SAE-A. AAFRB.

Oka 383. In process.... Cummins 6bt. Allison 2500 6spd. NP205. Dana 80 F & R.
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FS as is or as cab chassis.

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28 Apr 2020 19:00 #3 by Landseer
Landseer replied the topic: Thermo Amplifier
I have pulled my rear air out of my LT. Sitting in my shed’ contemplating taking it to the tip.

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28 Apr 2020 20:48 #4 by Ralley
Ralley replied the topic: Thermo Amplifier
It plugs into the wiring harness in the rear fuse box. I would take a pic if it was there.
Did you remove this part Landseer?

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  • Dean and Kaye Howells
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29 Apr 2020 11:25 - 29 Apr 2020 11:26 #5 by Dean and Kaye Howells
Dean and Kaye Howells replied the topic: Thermo Amplifier
Are you working on a bus with a large rear aircon unit ? ie. does it have a separate rear aircon temp rheostat.

#413 was originally a multi-cab and although it has a rear aircon unit I would assume a full bus would have a larger aicon unit. #413 does not have a thermo amplifier / rheostat / thermistor fitted.

Looking at the circuit it would appear that the 'thermo amplifier' in conjunction with the rear aircon temp rheostat and a suitably located thermistor control the rear aircon solenoid which in turn operates the rear aircon solenoid valve which presumably regulates refrigerant flow to the rear aircon unit. It operates separately to the rear fan(s) controls. This would allow separate coolant and fan speed control to the rear of the bus but may not be fitted to all models.

Perhaps the LT you're looking at didn't have this fitted ?

Deano :)
Last Edit: 29 Apr 2020 11:26 by Dean and Kaye Howells.

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29 Apr 2020 18:53 #6 by Ralley
Ralley replied the topic: Thermo Amplifier
After working through what was working and what wasn’t, all those things are wired to the amplifier.
I have one on the way from Ian Jones. Will see how it goes.
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30 Apr 2020 05:22 #7 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Thermo Amplifier
374 has full bus air with the thermostat and fan control on the dash for the rear unit and I've not seem one of those units in the power box. will pull the lid off and have a look.
From memory there is a big power socket like that hanging free.

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