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Table of Contents
Table of Contents _____________________________________________________________________ 2
Safety _______________________________________________________________________________ 3
Specifications ________________________________________________________________________ 5
Typical Plumbing Connections ___________________________________________________________ 7
A2A540&600 with fossil fuel fired domestic back up and domestic assist _______________________ 7
A2W540&600 with electric back up and domestic assist _____________________________________ 7
Wiring Diagram _______________________________________________________________________ 8
Introduction __________________________________________________________________________ 9
How It Works ________________________________________________________________________ 9
Heating Mode ______________________________________________________________________ 9
Cooling Mode ______________________________________________________________________ 9
Outdoor Fan Motor Operation _________________________________________________________ 9
Defrost __________________________________________________________________________ 10
Controls and monitoring _______________________________________________________________ 10
Monitoring _______________________________________________________________________ 10
Control __________________________________________________________________________ 10
Wiring ___________________________________________________________________________ 10
Installation __________________________________________________________________________ 10
Indoor Unit Location _______________________________________________________________ 10
Ductwork ________________________________________________________________________ 11
General ________________________________________________________________________ 11
Supply Ductwork ________________________________________________________________ 11
Return Ductwork ________________________________________________________________ 11
System Supplemental Heat ___________________________________________________________ 11
Domestic water assist Heat Exchanger __________________________________________________ 11
Outdoor Unit Location ______________________________________________________________ 11
Stand Alone Outdoor Unit Option _____________________________________________________ 11
Wall Mounted Outdoor Unit Option ____________________________________________________ 12
Refrigerant Connections _____________________________________________________________ 12
Charging refrigerant ________________________________________________________________ 13
Electrical ___________________________________________________________________________ 13
Electrical – LINE Voltage ___________________________________________________________ 13
General Line Voltage Wiring _______________________________________________________ 13
Indoor Unit Power Connection _____________________________________________________ 13
Outdoor Unit Power Connection ____________________________________________________ 14
Domestic water assist pump ________________________________________________________ 14
Field Wiring ____________________________________________________________________ 14
Electrical – LOW Voltage ___________________________________________________________ 14
Thermostat Connections __________________________________________________________ 14
Control and communication cable between indoor and outdoor unit. ________________________ 14
Start Up Procedures ___________________________________________________________________ 14
Initial Check ______________________________________________________________________ 14
Commissioning report ______________________________________________________________ 14
Defrost Test ______________________________________________________________________ 14
Service and Maintenance _______________________________________________________________ 15
Indoor unit _______________________________________________________________________ 15
Outdoor Fan ______________________________________________________________________ 15
Compressor _______________________________________________________________________ 15
Cabinet __________________________________________________________________________ 15
Refrigerant System _________________________________________________________________ 15
Maintenance for forced air system _____________________________________________________ 15
Unit & System Checklist _______________________________________________________________ 15
Warranty ___________________________________________________________________________ 16