Envision NSZ Installation Manual download pdf (Page 32)

NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL

Standard Microprocessor Controls

To check the unit control board for proper operation:

Disconnect thermostat wires at the control board.1.

Jumper the desired test input (Y1, Y2, W, O or G) to the 2.

R terminal to simulate a thermostat signal.

If control functions properly:3.

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 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 outside

recommended ranges, an adjustment to the refrigerant

charge may be necessary.

NOTES: Refrigerant tests must be made with hot water

generator turned “OFF”. Verify that air and water flow 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

FD Thermistor

(Loop <15° F,

Well<30°F) Lockout

FD Thermistor

(Loop <15° F,

Well<30°F)

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

>130°F

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

Troubleshooting

If control responds improperly:4.

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.•

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Envision NSZ Installation Manual Page 32

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