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Q: need an in line voltage theromstat that will is used for COLD not HEAT ( No Answer,   3 Comments )
Question  
Subject: need an in line voltage theromstat that will is used for COLD not HEAT
Category: Family and Home > Home
Asked by: richmcm-ga
List Price: $10.00
Posted: 29 Jun 2003 19:16 PDT
Expires: 29 Jul 2003 19:16 PDT
Question ID: 223310
(some times referred to reverse action theromstat).  I have a 220
in-wall Air Conditioner.  These Air conditions come with no frills
such as a timer or thermostat.  My electrican friend will run a
thermostat from the 220 breaker in my kitchen into an in-line
theromstat, allowing my in-wall unit to come on when it get's too warm
in the kitchen. The problem is we can't find a unti that is used to
turn on when it get's too HOT, they all appear to be for turning on
Heat.  Follow link for idea example theromstat except it is for
turning the heat on instead of the AC: 
http://plumbing.aubuchonhardware.com/heating_duct/thermostats_and_thermocouples/remote_wall_mounted_line_voltage_thermostat-408514.asp

Clarification of Question by richmcm-ga on 02 Jul 2003 15:06 PDT
Robert, thanks for your comments.  I have relayed them to the
electrican.  I left out a key piece of information that I need to
clarify for you.  I live in a condo.  The circuit breaker box for my
condo unit is in the kitchen, that's why we were looking to install
the thermostat in the kitchen.  We would be installing the theromstat
directly below the breaker box and connecting to the 220v circuit for
the air conditioner directly in the circuit box.  As it is now, there
must be 220v wire going from my breaker box in the kitchen to the 220
outlet in the living room the the A/C plugs into right?  These condos
are aprox 20 years old which is why they have 220 outlets for the A/C
to plug into. I must assume that there is 220v wire running from the
breaker in my kitchen to the A/C outlet in the living room wall
already... right?  Is this unsafe?

Are you saying we would be in code violation to put an in-line
theromstat into the 220 breaker?  If so, do you know what code number
this would be?  (Sorry if I have the terminlogy incorrect).

What about putting an in-line thermostat right next to the 220 outlet
in the living room?  Would that be safer?

Lastly, what about installing the 24v transformer and relay inside the
breaker box in the kitchen?  And having a 24v thermostat as you
suggested - does that make the most sense giving the latest
information?  thanks!  rich

Clarification of Question by richmcm-ga on 08 Jul 2003 11:50 PDT
Attention Robert: 
Robert, thanks for your comments.  I have relayed them to the 
electrican.  I left out a key piece of information that I need to 
clarify for you.  I live in a condo.  The circuit breaker box for my 
condo unit is in the kitchen, that's why we were looking to install 
the thermostat in the kitchen.  We would be installing the theromstat 
directly below the breaker box and connecting to the 220v circuit for 
the air conditioner directly in the circuit box.  As it is now, there 
must be 220v wire going from my breaker box in the kitchen to the 220 
outlet in the living room the the A/C plugs into right?  These condos 
are aprox 20 years old which is why they have 220 outlets for the A/C 
to plug into. I must assume that there is 220v wire running from the 
breaker in my kitchen to the A/C outlet in the living room wall 
already... right?  Is this unsafe? 
  
Are you saying we would be in code violation to put an in-line 
theromstat into the 220 breaker?  If so, do you know what code number 
this would be?  (Sorry if I have the terminlogy incorrect). 
  
What about putting an in-line thermostat right next to the 220 outlet 
in the living room?  Would that be safer? 
  
Lastly, what about installing the 24v transformer and relay inside the 
breaker box in the kitchen?  And having a 24v thermostat as you 
suggested - does that make the most sense giving the latest 
information?  thanks!  rich
Answer  
There is no answer at this time.

Comments  
Subject: Re: need an in line voltage theromstat that will is used for COLD not HEAT
From: atr-ga on 30 Jun 2003 06:59 PDT
 
I had the same "root" problem (but different part of the house :-]).
After months of searching I opted for a custom solution, using a
proprietary circuit board from a local engineer.

The runner-up solution was getting a "Series 6000" thermostat from
european company Danfoss, which is available in the US as special-order,
but costs around $180 and takes 30 days to deliver. Their sales rep is
hard to get ahold of, since most distributors have not heard of a "6000".
Subject: Re: need an in line voltage theromstat that will is used for COLD not HEAT
From: robertw-ga on 30 Jun 2003 07:03 PDT
 
You absolutely DO NOT want to install a 220v line voltage at a remote
location!
For a safe installation, you want to put a standard 24 volt cooling
thermostat at the location you want controlled. Have your electrician
friend install a 24v transformer and relay inside the case of the 220v
A/C.  The relay should have a 24v coil and 220v rated contacts
sufficent to handle the amperage of the A/C unit. This will safely
switch the 220v inside the A/C cabinet and the wires to your kitchen
will be a building code approved 24v.
Running the 220v would be hazardous to your health & wallet.
I am a 59 yr old electrical design engineer, this is the best free
advice you may ever get ;)
Subject: Re: need an in line voltage theromstat that will is used for COLD not HEAT
From: brakk0-ga on 15 Jul 2003 07:56 PDT
 
Robertw, I don't think he cares what voltage the thermostat runs on,
just that it controls 220.

Richmcm, What Robertw is trying to say is to find a thermostat that
runs off of 24v (what heaters and A/C units use normally) like this
one http://www.totalvac.com/store/merchant.mv?Screen=PROD&Store_Code=totalvac&Product_Code=CT41&Category_Code=honeywellmanualthermostats
and just hook it to a 220v relay. Your electrician friend should be
able to find you a relay that would work and wire it all up in a safe
box to stick in the wall with just the thermostat sticking out.

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