Envision NSZ Installation Manual download pdf (Page 20)

NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL

Green "POWER" LED - module has power

Red "TRIP" LED - Thermostat "Y" demand signal is present, but the compressor is not running.

Yellow "ALERT" LED LED Description Cause

Flash Code 1 Long Run Time Not applicable

Flash Code 2 System Pressure Trip Not applicable

Flash Code 3 Short Cycling Compressor run time of less than 3 minutes on 4 consecutive cycles

Flash Code 4 Locked Rotor Four consecutive compressor protector trips indicating compressor won't start

Flash Code 5 Open Circuit "Y" thermostat demand signal with no compressor current

Flash Code 6 Open Start Circuit "Y" thermostat demand signal with no current in the start circuit

Flash Code 7 Open Run Circuit "Y" thermostat demand signal with no current in the run circuit

Flash Code 8 Welded Contactor Current detected with no "Y" thermostat demand signal present

Flash Code 9 Low Voltage Less than 17 VAC detected in control circuit

* Flash code number corresponds to a number of LED flashes, followed by a pause and then repeated.

* TRIP and ALERT LEDs flashing at the same time indicates control circuit voltage is too low for operation.

* Reset ALERT flash code by removing 24 VAC power from module.

* Last ALERT flash code is displayed for 1 minute after module is powered on.

Resetting Comfort Alert Codes

Alert codes can be reset manually by cycling power off and on to the Comfort Alert module. Alert codes will reset automatically if

conditions return to normal.

Flash Code Number LED Description Automatic Reset of Alert Codes

Flash Code 1 Long Run Time Not applicable

Flash Code 2 System Pressure Trip Not applicable

Flash Code 3 Short Cycling Four "alert free" on and off cycles to reset automatically

Flash Code 4 Locked Rotor Four "alert free" on and off cycles to reset automatically

Flash Code 5 Open Circuit One "alert free" on and off cycles to reset automatically

Flash Code 6 Open Start Circuit One "alert free" on and off cycles to reset automatically

Flash Code 7 Open Run Circuit One "alert free" on and off cycles to reset automatically

Flash Code 8 Welded Contactor One "alert free" on and off cycles to reset automatically

Flash Code 9 Low Voltage Resets when voltage rises above 19 VAC

* Reset ALERT flash code by removing 24 VAC power from module.

Comfort Alert Flash Codes

Microprocessor Control cont.

Compressor Monitoring/Comfort Alert

The Comfort Alert displays abnormal compressor condi-

tions through a unique flash code and communicates the

conditions to the heat pump microprocessor control. The

heat pump microprocessor will determine which fault to act

on and ignore. Fault codes 2 (system pressure), 4 (locked

rotor), 6 (open start circuit), and 7 (open run circuit) will re-

sult in a lockout. All other fault codes are passive. All com-

pressor alerts are displayed on the module by flashing the

yellow Alert LED a specific number of times consecutively

followed by a pause, and then repeated. The number of

consecutive flashes or “Flash Code” correlates to a specific

abnormal condition. The red “TRIP” LED means there is a

thermostat demand signal “Y” present but the compressor

is not running. The green “POWER” LED means the module

has power.

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Envision NSZ Installation Manual Page 20

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