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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a old 1978 mach 1 ac the old ceiling unit used

Customer Question

I have a old 1978 coleman mach 1 ac the old ceiling unit used positive (hot) wires for ac control on thermostat . I want to replace new ceiling unit with heat but diagram shows common wires on t state ?
Submitted: 1 month ago.
Category: HVAC
Customer: replied 1 month ago.
roof unit has red =fan, black= ac comp, whit = common wires .I know what the 4 leads and the main hot are on the switch but its the t state that should have common wires on it according to instructions of heat , compressor and common.old tstae switched hot 120vlt to leads thru switch and t state
Expert:  Gaztech replied 1 month ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue.

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Are you ready?

Customer: replied 1 month ago.
Expert:  Gaztech replied 1 month ago.

What is model of new unit?

Customer: replied 1 month ago.
61347 ceiling unit with heat on original upper unit
Expert:  Gaztech replied 1 month ago.

I will let another tech help you with that.

Customer: replied 1 month ago.
uploaded pic of old switch and wires
Customer: replied 1 month ago.
Coleman 9330F715 61365 ADB White Standard Heat Ready Ceiling AssemblyPart Number: Coleman 9330F715
Customer: replied 1 month ago.
Manufacturer #: 9330E715this is the new replacement lower unit

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