[W126 Coupe] Phoenix Relay Set-Up

[Iain Gunn]

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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