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Xringer · 01-22-13, 08:24 AM

Yeah, fooled me. I would not have expected an older non-inverter unit to have serial.
I guess the newer stuff is just a copy of the old stuff..

Pin #1 is a bi-directional control line. So, you not only send commands outdoors, you read back status data too.

Seems like it would be simpler to wire your control pair across the test button.. Brute Force Control.

Outdoor
• Once push : Ignore Communication error.
• Twice push : Comp. ON, / Outdoor Fan ON / Reversing Valve Coil ON(only Heating Model) / Crank Case heater Coil ON(only Heating Model)
• 3 Times push : Comp. ON, Outdoor Fan ON / Reversing Valve Coil OFF(only Heating Model) / Crank Case Heater Coil OFF(only Heating Model)
• 4 Times push : Same
• 5 Times push : Error LED(Red) ON
• 6 Times push : Comp OFF, Outdoor FAN OFF
• 7 Times push : Reset

That might get you the basic operations you need. If it will stay running in the test mode.. (No time-out).
And, you will likely have all protection/defrost functions too..

01-22-13, 08:24 AM	#19
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Yeah, fooled me. I would not have expected an older non-inverter unit to have serial. I guess the newer stuff is just a copy of the old stuff.. Pin #1 is a bi-directional control line. So, you not only send commands outdoors, you read back status data too. Seems like it would be simpler to wire your control pair across the test button.. Brute Force Control. Outdoor • Once push : Ignore Communication error. • Twice push : Comp. ON, / Outdoor Fan ON / Reversing Valve Coil ON(only Heating Model) / Crank Case heater Coil ON(only Heating Model) • 3 Times push : Comp. ON, Outdoor Fan ON / Reversing Valve Coil OFF(only Heating Model) / Crank Case Heater Coil OFF(only Heating Model) • 4 Times push : Same • 5 Times push : Error LED(Red) ON • 6 Times push : Comp OFF, Outdoor FAN OFF • 7 Times push : Reset That might get you the basic operations you need. If it will stay running in the test mode.. (No time-out). And, you will likely have all protection/defrost functions too.. __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..