[W126 Coupe] Phoenix Relay Set-Up

[Iain Gunn]

Another link for Bosch style relay revealed
http://www.classictruckshop.com/clubs/earlyburbs/projects/bosch/relay.htm
----- Original Message ----- 
From: "Iain Gunn" <igunn at bmts.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Friday, June 20, 2008 10:50 PM
Subject: Re: [W126 Coupe] Phoenix Relay Set-Up



> Dick, is there a reason you use this relay rather than a standard Bosch 

> style relay?

> http://www.wiringproducts.com/index1.html

>

> Iain

> ----- Original Message ----- 

> From: "Dick Spellman" <spell.yy at verizon.net>

> To: <jralex at ix.netcom.com>; "Mercedes Coupes Mailing Lists" 

> <mbcoupes at mbcoupes.com>

> Sent: Friday, June 20, 2008 12:22 PM

> Subject: Re: [W126 Coupe] Phoenix Relay Set-Up

>

>

>> Hi Jim,

>>

>> I've attached a jpg image of the 12 volt, 10 amp rated relay I use with

>> a map of terminals to wiring.

>>

>> For purposes of understanding what you are creating....you are

>> effectively energizing the relay coil when the compressor kicks on and

>> this results in the Normally Open to Common circuit on the relay

>> switching to CLOSED allowing the positive side of the fan circuit to be

>> completed hence, the fan kicks ON.  The trigger for energizing the relay

>> is off of the tapped lead (1 of 3) attached to the back of the Denso

>> compressor.  You have to tap the correct wire obviously.

>>

>> So, rather than wait for the fan pressure switch on the receiver/dryer

>> to call for added cooling sans the aux fan, you have added cooling at

>> all times so long as the ac compressor is on.

>>

>> I will attach an image of the relay wired in place in a second email 

>> soon.

>>

>> The aux fan for other running conditions such as the 110C manifold

>> sensor continues to behave as before when AC is not in use.

>>

>> Regards,

>>

>> Dick

>>

>> jralex at ix.netcom.com wrote:

>>> Dick, I am interested in the fan wiring info. Send to: 

>>> jralex at ix.netcom.com. Thanks! J. Alexander

>>>

>>> -----Original Message-----

>>>

>>>> From: Dick Spellman <spell.yy at verizon.net>

>>>> Sent: Jun 19, 2008 3:48 PM

>>>> To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>>>> Subject: [W126 Coupe] Phoenix Relay Set-Up

>>>>

>>>> If anyone is interested,

>>>>

>>>> I have photos and mapped the hook-up needed for a Denso compressor to

>>>> always run the aux fan circuit so long as AC is selected.  I'm doing 

>>>> the

>>>> write-up this weekend for Jonathan and sending him the relay I use for

>>>> this purpose as a thank you for all his techy and parts support.  This

>>>> is my third hot weather set-up of this kind.  It was originally

>>>> prescribed by Stu Ritter and I have just given it the nick-name Phoenix

>>>> because it's always steammy there in the summer months.

>>>>

>>>> Amazingly, the coolant temp never leaves the top of the 80C indicator 

>>>> on

>>>> these M103 motors with this set-up and this naturally assumes all other

>>>> components are in good service order like visco, tstat, radiator, water

>>>> pump, belt tension and so on.

>>>>

>>>> Take care and stay cool.

>>>>

>>>> Dick

>>

>>

>

>

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