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ECO-Y INSTALLATION MANUAL
Standard Microprocessor Controls
To check the unit control board for proper operation:
1) Disconnect thermostat wires at the terminal board.
2) Jumper the desired test input (Y1, W, O, or G) to the R
terminal to simulate a thermostat signal.
3) If control functions properly:
• Check for thermostat and field control wiring (use the
diagnostic inputs mode).
Refrigerant Systems
To maintain sealed circuit integrity, do not install service gauges
unless unit operation appears abnormal. Compare the change in
temperature on the air side as well as the water side to the Unit
Operating Parameters tables. If the unit’s performance is not
within the ranges listed, and the airflow and water flow are known
to be correct, gauges should then be installed and superheat and
subcooling numbers calculated. If superheat and subcooling are
LED Definitions and Diagnostics
Microprocessor
Status Display Mode
LED
SW1-4 On, SW2 Off
Drain
Drain Pan Overflow Lockout
Water Flow
Freeze Detection (Loop <= 15°F, Well <= 30°F)
High Pressure
High Pressure Lockout
Low Pressure
Low Pressure Lockout
Air Flow
Not Used
Status
Micoprocessor Malfunction*
HW Limit
Not Used
HW
SW2 Status (Off=Down Position, On=Up Position)
Diagnostic Display Modes
Current Fault Display Mode
Inputs Display Mode
Outputs Display Mode
LED
SW1-4 On, SW2 On
SW1-4 Off, SP2 Off
SW1-4 Off, SW2 On
Drain
Drain Pan Overflow Lockout
Y
Compressor
Water Flow
Freeze Detection Lockout
G
Blower
High Press .
High Pressure Lockout
O
Reversing Valve
Low Press .
Low Pressure Lockout
ES
ES
Air Flow
Not Used
NS
NS
Status
Not Used
LS
LS
HW Limit
Not Used
Not Used
Not Used
HW
SW2 = On
SW2 = Off
SW2 = On
* Flashing Status Light Indicates the Board is Functioning Properly.
A Solid “On” Indicates a Board Malfunction.
4) If control responds improperly:
• Ensure that component being controlled is
functioning (compressor, blower, reversing valve, etc.).
• Ensure that wiring from control to the component is
functioning (refer to the LED Definition table below and
use the diagnostic outputs mode).
• If steps above check properly, replace unit control.
Troubleshooting
outside recommended ranges, an adjustment to the refrigerant
charge may be necessary.
NOTE:
Refrigerant tests must be made with hot water generator
pump power disconnected. Verify that air and water flow rates are
at proper levels before servicing the refrigerant circuit.