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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8164
Experience:  Furnace, A/C and heat pump specialist.
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Having problem setting up a Honeywell TH5220D thermostat to

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Having problem setting up a Honeywell TH5220D thermostat to a Arcoaire heatpump 4 ton unit PHD348. Leads on heatpump are Violet-Emergency heat, White-Auxilary heat, Green-Fan relay, Orange-Changeover valve, Brown-common, Yellow-compressor contact, Blue-DH, Gray-for 3 phase use.(not using 3 phase). How connections are needed on the TH5220D, and what shoud the program setup be in this thermostat. Thank. Dker
Hello.My name is XXXXX XXXXX I will do my best to help.Troubleshooting often requires meters and test equipment.Let's get started and see what we can do!
I will be glad to assist you with this,first , do you not have a red? We should have a red for power.

Customer: replied 3 years ago.

Sorry: I do have a red

Excellent.Here is how to wire:
Red to R with jumper to RC
Green to G
Orange to O/B
Violet to E
White to AUX
Brown to C
Yellow to Y
Blue tape off (unused
Gray tape off (Unused)
Next we will configure thermostat to match your system.
Customer: replied 3 years ago.

Great, Thanks Tim

Now do you know how to enter the installer setup menu?
Customer: replied 3 years ago.


Then in Installer setup :
Function 1 should be 5
Function 2 should be 0
Function 3 should be 1
Function 5 should be 9
Function 6 should be 9
Function 8 should be 9
Function 9 should be 3
Function 10 should be 3
Function 12 is your choice
Function 14 0 for Fahrenheit or 1 for Celsius
Function 15 should be 5
Function 26,27 and 28 are up to you
Customer: replied 3 years ago.

Tim, on the thermostat installation instructions there is an L for relay, is that anything that should be considered. (Typical 2H/1C heatpump system)

You will not need anything connected to that L terminal. It is an output terminal.We will not be using it.
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Customer: replied 3 years ago.

Great, Thanks Tim you've been a great help.

Thanks for allowing me to help. After rating answer, feel free to come back to follow up should you have any more questions.

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