Unit Controls

TM 10-4110-262-13&P

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(3) Unit Operation / Cooling Mode Indicator Light

When this light is on, it indicates the unit is operating in either the cooling or heating modes. A green light

indicates the unit is in the cooling mode. A red light indicates the unit is in the heating mode. When the

unit is stopped by the thermostat, HPCO, or LPCO, the unit operation indicator light will be off and the ON

indicator will remain ON.

(4) Defrost Indicator Light

When this light is on, it indicates that the unit is in the defrost mode.

(5) Manual Defrost Key

Press this key to start the defrost cycle. The unit will not defrost unless the defrost termination switch is

closed and the evaporator coil temperature s below 36 F (2 C).

(6) Thermostat Dial

Turn this dial to adjust the thermostat setpoint.

NOTE

The thermostat dial will change the thermostat setpoint without pressing

the setpoint key.

(7) Setpoint Key

Press this key to make the thermostat setpoint appear on the digital display. The thermostat setpoint will

remain on the display for 10 to 15 seconds after the key is released. This gives the operator time to

adjust the thermostat setpoint.

(8) Setpoint Key Indicator Light

When this light is on, the display is indicating the setpoint temperature.

(9) AC Overload Indicator

When this light is on, it indicates that the overload relay has opened and the unit has been stopped. The

indicator must be reset by pressing the ON/OFF key after allowing the overload relay to cool.

(10) Digital Display

This display is active only when the unit is turned on. The thermometer reading (return air sensor

temperature) normally appears on the display. Pressing the setpoint key causes the thermostat setpoint

to appear on the display for 10 to 15 seconds.

(11) Celsius Indicator Light

When this light is on, it indicates that the temperature is being displayed in degrees Celsius (C).

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