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I have a Carrier 42TX Cooling unit which I am trying to

Customer Question
Hello, I have a...

Hello, I have a Carrier 42TX Cooling unit which I am trying to change the old thermostat with a new smart one. I know that it is compatible with both Nest and Ecobee since some people with the same unit told me that they managed to install the smart thermostat. However, I am having difficulty identifying the wire because they are connected to the old thermostat using a small multi-pin connector. I can upload a picture of the connector if that helps

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

I just need help identifying the wires

Contractor's Assistant: Do you plan on doing the work yourself?

Yes

Contractor's Assistant: Anything else we should know to help you best?

Here's a link to the pictures showing the connector: https://imgur.com/gallery/OJXtH

Submitted: 10 months ago.Category: HVAC
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Answered in 52 minutes by:
9/24/2017
HVAC Technician: gotoman for ac, HVAC Technician replied 10 months ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,358
Experience: 51 years of experience install design and repair of all makes and models of AC
Verified

Russ here. I will take a look at photos.

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HVAC Technician: gotoman for ac, HVAC Technician replied 10 months ago

Need the full module number of unit to pull schematic.

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Customer reply replied 10 months ago
Hi Russ,
Here are the wiring schematics I was given:
https://jvtcommunity.files.wordpress.com/2013/08/carrier-air-conditioning-unit.pdf
https://jvtcommunity.files.wordpress.com/2013/08/carrier-remote-control-digital-thermostat.pdfIf you need more info on the module number I can try to look for it when i get home in about 3 hours.
HVAC Technician: gotoman for ac, HVAC Technician replied 10 months ago

Need more info on module. Russ

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Customer reply replied 10 months ago
The system has two modules, one outside the house and another one inside the house. The one outside has a model number: Carrier 38HKC18DS70-01, the module inside the house has a model number of: FB4ASSF018000R.
This website seems to have the closest schematics:http://www.carrier.com/building-solutions/en/sa/products/residential/ducted-split-systems/38pk-fb4/#tab-3The indoor unit is the exact same.
HVAC Technician: gotoman for ac, HVAC Technician replied 10 months ago

Ca not find any info on unit. Will opt for another Expert. Russ

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HVAC Technician: Michael Ferryman,
 replied 10 months ago
Michael Ferryman
Category: HVAC
Satisfied Customers: 110
Experience: Operating Engineer at NRG Energy
Verified

what color are the thermostat wires that your unit is currently using.

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Customer reply replied 10 months ago
Black, red, white and yellow
HVAC Technician: Michael Ferryman,
 replied 10 months ago

you should be able to wire a new throumostat no problem using the nest instructions. Red is hot White is heat yellow is compressor... no green? black should be your common

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HVAC Technician: Michael Ferryman,
 replied 10 months ago

did you need further help with this?

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HVAC Technician: Michael Ferryman,
 replied 10 months ago
Did you need any further help with this? If not can you give me a 5 star rating. Would really help me out. Thanks so much.
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