check out the new remote control Jockey Wheel SmartBar Topargee products Enginesaver Low Water Alarms
Members Login
Username 
 
Password 
    Remember Me  
Click here for the Grey Nomads website -> The Grey Nomads Forum -> Techies' Corner -> Waeco Compressor Fridge Wiring
Post Info TOPIC: Waeco Compressor Fridge Wiring
ROAD RUNNER


Veteran Member

Status: Offline
Posts: 71
Date:
Waeco Compressor Fridge Wiring
Permalink  

Hello, I'm trying to bypass the original thermostat on my waeco CRX140lt 12v/240v compressor fridge with a digital thermostat and wondering if anyone has done the same and can provide some assistance in identifying the various coloured wires coming out of the block adjacent to the compressor.

I managed to wire up and operate the digital thermostat on the test bench using a 12v lamp but now need to connect to the fridge itself and unsure which wires are which?. Thanks in advance

 



__________________
DeBe


Guru

Status: Offline
Posts: 1467
Date:
Permalink  

Can you post a picture of the compressor controller on your fridge & one of the thermostat you are using.


__________________
D.L.Bishop
ROAD RUNNER


Veteran Member

Status: Offline
Posts: 71
Date:
Permalink  

Hi, haven't sent pictures before so hope they show up. The digital thermostat is the one on the LHS reading 33cWAECO Wiring.jpgDigital Thermostat.jpg



Attachments
__________________
DeBe


Guru

Status: Offline
Posts: 1467
Date:
Permalink  

You will need to remove the bottom white wire  T , as this is where one of the thermostat wires goes to. The other thermostat wire goes to C but leave the grey wire connected to it. You will meed a 650 ohm resistor in the circuit so the compressor runs at 3000RPM this is the value for a BD50 compressor. Power for the thermostat will come from A+ & C-- , this is 12V dc that feeds the internal lighting in the fridge.CONT & THERM.1.JPGCONT & THERM.2.JPGCONT.B.JPG 



-- Edited by DeBe on Wednesday 29th of November 2017 09:40:10 PM



-- Edited by DeBe on Wednesday 29th of November 2017 09:43:11 PM

Attachments
__________________
D.L.Bishop
DeBe


Guru

Status: Offline
Posts: 1467
Date:
Permalink  

The 1.5K resistor was for a BD35 compressor. Interested to know why you want to change to an electronic thermostat? A good clear picture of the circuit diagram on the back of the fridge would be usefull to.



-- Edited by DeBe on Wednesday 29th of November 2017 09:52:21 PM

__________________
D.L.Bishop
Peter_n_Margaret


Guru

Status: Offline
Posts: 4375
Date:
Permalink  

BD35 manuals can be downloaded.
Running one at 3000rpm will provide maximum cooling, but will also be least efficient. If the insulation is reasonable it will use less total power if you run the compressor at a slower speed.
Longer cycles at lower speed are more efficient.

Cheers,
Peter

__________________

OKA196, 4x4 'C' Class, DIY, self contained motorhome. 960W of solar, 400Ah of AGMs, 310L water, 280L fuel. https://www.oka4wd.com/forum/members-vehicles-public/569-oka196-xt-motorhome
 

 
DeBe


Guru

Status: Offline
Posts: 1467
Date:
Permalink  

Waeco upright fridges need every bit of cooling compared to the portable ones. Also his fridge has a BD50F compressor in it. My 80L upright has a BD35F in it.

__________________
D.L.Bishop
ROAD RUNNER


Veteran Member

Status: Offline
Posts: 71
Date:
Permalink  

Thanks D.L. and Peter for your great advice and detailed wiring help, much appreciated. The reason for going digital is that the standard WAECO thermostat appears to work well in summer however becomes quite "lazy" in the winter and the temperature can rise to around 8c or more before the compressor comes on so I think the gap between on and off is far too wide.
A friend of mine with the same model fridge had a "winter" kit installed by the WAECO dealer in Adelaide which alleviated the problem to a degree but the cost was far in excess of an ebay digital controller for around $20, plus I can see at a glance what the temp is.
Thanks again for your valuable advice. Eddy

__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Click here for the Grey Nomads website -> The Grey Nomads Forum -> Techies' Corner -> Waeco Compressor Fridge Wiring
Tweet this page Post to Digg Post to Del.icio.us
Purchase Grey Nomad bumper stickers Read our daily column, the Nomad News The Grey Nomad's Guidebook