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Hi, I want to install a Digital thermostat with 24 Voltage, what I need to install into a MasterCool

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Ya te dije que necesitas un reelevador de 24 VAC de dos contactos normalmente abiertos y un transformador de AC de 120 a 12 volts. Jejeje E. Verdugo.
P.D.Aqui en Chihuahua venden el reelevador a 270 pesos y el transformador dondequiera lo hayas nomas fijate que sea de minimo un amper de corriente.

Posted on Jul 31, 2009

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I have a MasterCool II MC63/64B and the thermostat has gone out. Since MasterCool is out of business, what model/brand would I replace it with.


If you are just running the evaporative cooler any single stage thermostat will suffice. You can buy them at OSH, Home Depot or Lowe's and probably Ace Hardware.

Aug 03, 2011 | Mastercool 67680 Evaporative Cooler Air...

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Our mastercool thermostat does not have any power going to it whatsoever. It is only a 3 year old unit and we have checked all the fuses and wiring which all seem to be fine. We even changed the main...


If it's a 24 volt thermostat, the inline transformer has failed and needs to be replaced. Some are 18 volts, and they require a transformer too. I suspect that's the problem, since the T-Stat is not getting power.

Hope this helps you solve the problem. Please let me know. Thanks.

May 06, 2011 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

Model 1f90w-51 the up down buttons stopped working this is a white-rodgers


Electronic Digital Multi-Stage Thermostat 1F83-261

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  • Hi, This is a good stat and I have used it alot in the past as it is a older model. If you have 24 volt control voltage at the stat, and the battires are good, then you have a malfuntion in the ciruitry and will need to replace it. I have sent you a ton of manuals on there products I thiught they may be helpful. Please dont forget to rate this post as I know you will be kind. I hope I have been of help to you.
  • Sincerely,
  • Shastalaker7
  • A/C, Heating Contractor

Sep 22, 2010 | Heating & Cooling

1 Answer

How to connect a thermostat to heat source. bought thermostat to work in a homemade incubator. i can power in unit but when i connect heat source(light bulb) it wont switch it on when temperature is below...


get yourself a RIB (relay in a box) relay that is rated at 24/120. Also purchase a 24 volt door bell transformer. Wire 2 24 volt thermostat from one side of the transformer to the low voltage side of the relay then to the 24 volt thermostat than back to the other low voltage wire of the transformer. On the high voltage side, from your light bulb cut the wire going to the center lug of the light. Run one side of the wire to one side of the high voltage side of the relay, then run a wire from the other side of the relay (again high voltage side) to the the other side of the wire you cut on the light.

Mar 08, 2010 | Heating & Cooling

1 Answer

Have a Ruud AC unit the problem I have after installing a new condenser fan motor when I throw the circuit breaker the unit will not turn on but when I push the contacts on the contactor in manualy the fan...


The contactor engages from low voltage power from the thermostat as does the outside condensing unit. You may have blown the low voltage transformer or have a loose thermostat wire. Check line voltage(220 volts) to the transformer. Check load voltage(24 volts) from the transformer. If no voltage out,replace the transformer. If you have voltage out(24) check the thermostat wires and the thermostat. If you have a digital thermostat there is a 5 minute delay in the thermostat after power is restored before it activates.

Oct 08, 2009 | Ruud Central System Air Conditioner

1 Answer

Water pouring out of my Mastercool, whether off or on.


AC removes moisture from the air which helps us feel a lot more comfortable.  After you turned the AC off all the water that it took out from the air poured out.  Below are some of the reasons which may have caused it.:
Improper Installation Buildup of Ice inside the AC Leakage of warm air (warm air mixing with the cool air inside causes moisture to form) Blocked drain - you just need proper cleaning for this

Jun 08, 2009 | Mastercool Heating & Cooling

1 Answer

Rewire 12Volt into 24Volt


You have to get you a transformer .voltage input 120 and out put 24 volts.But will have to wire it through a relay or contacter with the coil volts 24.

Mar 25, 2009 | Dometic 57915531 Air Conditioner

1 Answer

Mastercool swamp cooler fan doesnt come on.


Are the relays perment on the board or are they seperate from the main board? If they are mounted to the board, you will need to replace the board. Sounds like you are getting a call to the relay but none leaving so this would indicate that you have a bad relay switch.

Mar 20, 2009 | Mastercool 67680 Evaporative Cooler Air...

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