Envision Peripherals Series installation manual Troubleshooting, Standard Microprocessor Controls

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 field 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 Definition table below and use the diagnostic outputs mode).

•If steps above check properly, replace unit control.

LED Definitions and Diagnostics

Standard Microprocessor

NORMAL

DIAGNOSTIC MODES

LED

DISPLAY MODE

CURRENT

INPUTS

OUTPUTS 1

OUTPUTS 2

FAULT STATUS

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 Overflow

Drain Pan Overflow

Y1

Compressor

Blower

Lockout

(On or Low)

Low

FP Thermistor (Loop

FP Thermistor (Loop

Compressor

Blower

Water Flow

<15º F, Well<30ºF)

Y2

<15º F, Well<30ºF)

(On or High)

Medium

Lockout

High

High Pressure >600

High Pressure >600

O

Reversing Valve

Blower

Pressure

PSI Lockout

High

Low

Pressure,

Low Pressure <40

Low Pressure <40

G

Fan

Aux Heat 1

Current

Sensor

Airflow

ECM2 RPM <100

ECM2 RPM <100

W

DHW Pump

Aux Heat 2

RPM

RPM

Status

Microprocessor

Not Used

SL1

Loop Pump 1

Aux Heat 3

Malfunction

DHW Limit

HWL Thermistor

HWL Thermistor

Not Used

Loop Pump 2

Aux Heat 4

>130ºF

>130°F

DHW Off

DHW Pump

DHW Pump Switch Off

–

–

–

Switch Off

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 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 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 flow rates are at proper levels before servicing the refrigerant circuit.

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