Thermostat / Compressor Operation

The compressor operation is controlled according to thermostat calls.

• After a power cycle, when the unit receives a Y1 signal, Compressor A is delayed for 3 minutes to start.
• After the first Y1 call, each subsequent Y1 call has a 7-minute delay.
• When the unit receives a Y2 signal, after compressor A is turned on, compressor B is delayed for 3 seconds to start.
• When the unit just receives a Y1 signal, only one compressor turned on, compressor A and compressor B are rotated according to the running time. (Running times are tracked in the board and cannot be viewed).

Note:

You will get an Eb Error Code if you give the board an invalid thermostat call.

Eb is a unit lock-out and requires a power cycle to clear.

Below are examples of invalid thermostat calls:

• Y1 without a G
• W1 without a G
• Y2 before Y1
• Heat and Cool call at the same time.

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.