Envision Peripherals Series Heat Pump User Manual


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29
NS SPLIT INSTALLATION MANUAL
Troubleshooting
Standard Microprocessor Controls
To check the unit control board for proper operation:
1. Disconnect thermostat wires at the control board.
2. Jumper the desired test input (Y1, Y2, W, O or G) to the R terminal to simulate a thermostat signal.
3. If control functions properly:
• Check for thermostat and eld control wiring (use the diagnostic inputs mode).
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 Denition table below and use
the diagnostic outputs mode).
• If steps above check properly, replace unit control.
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 tables on pages 26-27. If the unit’s performance is
not within the ranges listed, and the airow and water ow are known to be correct, gauges should then be installed and
superheat and subcooling numbers calculated. If superheat and subcooling are outside recommended ranges, an adjust-
ment to the refrigerant charge may be necessary.
Notes:
Refrigerant tests must be made with desuperheater turned “OFF”.
Verify that air and water ow rates are at
proper levels before servicing the refrigerant circuit.
LED
NORMAL
DISPLAY MODE
DIAGNOSTIC MODES
CURRENT
FAULT STATUS
INPUTS OUTPUTS 1 OUTPUTS 2
Field Selection DIPS
SW2- 1 On SW2- 1 Off SW2- 1 NA SW2- 1 NA SW2-
1 NA
SW2- 6 On SW2- 6 On SW2- 6 Off SW2- 6 On SW2-
6 Off
SW2- 7 On SW2- 7 On SW2- 7 On SW2- 7 Off SW2-
7 Off
Drain
Drain Pan Overow
Lockout
Drain Pan Overow Y1
Compressor
(On or Low)
Blower
Low
Water Flow
FP Thermistor (Loop
<15º F, Well<30ºF)
Lockout
FP Thermistor (Loop
<15º F, Well<30ºF)
Y2
Compressor
(On or High)
Blower
Medium
High
Pressure
High Pressure >600
PSI Lockout
High Pressure >600 O Reversing Valve
Blower
High
Low
Pressure,
Current
Sensor
Low Pressure <40 Low Pressure <40 G Fan Aux Heat 1
Airow
ECM2 RPM <100
RPM
ECM2 RPM <100
RPM
W DHW Pump Aux Heat 2
Status
Microprocessor
Malfunction
Not Used SL1 Loop Pump 1 Aux Heat 3
DHW Limit
HWL Thermistor
>130ºF
HWL Thermistor
>130°F
Not Used Loop Pump 2 Aux Heat 4
DHW Off
DHW Pump
Switch Off
DHW Pump Switch Off – – –
LED Denitions and Diagnostics
Standard Microprocessor
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