Specifications

6. Press Hum again and the display will show the “d” (differential)

“d” means the differential: the setting starts from 2.0 to a maximum of 4 in increments of 0.5. It

indicates the maximum upper and minimum lower value about the current set-point and dead band

setting at which the controller will turn the Humidifier ON or OFF.

7. Press Hum again to return to the normal LCD display.

Example: If the humidity set point is 55% and “db” is 3 and “d” is 2.0. This implies that if the

humidity reading is between 58% and 52%, the controller will NOT control the humidifier. However,

if the reading is above 60%, the controller will turn the humidifier OFF, but if current humidity if less

than 50 %, the controller will turn the humidifier ON.

In summary

, in the humidity range of 50%

to 60% there is no control action on the humidifier.

Humidity Override

1. Press Hum button.

2. Press the button to inactivate the humidifier.

Dehumidification / Reheat

The MP Controller contains a built in dehumidification function.When the humidifcation function is

activated and the humidity in the space is sensed to be higher than the settings, the cooling cycle

will automatically be activated to lower the humidity level.

On the display LCD a symbol will appear above “Dry” to indicate that this function has been

activated.

On units with a heater source (typically electric heat, but can be another source such as a steam coil

or hot water coil), if the space temperature drops below the cooling setting, the heat source will be

activated to temper or maintain the space temperature.

Auto Fan

Pressing the AUTO FAN button will toggle the unit between fan and auto fan modes.

1.Press AUTO FAN button, if the display shows AUTO FAN, the unit fan will be ON only when

there is a call for cooling or heating. In the stand by mode, the fan will be OFF.

2. Press AUTO FAN button again, to place the fan in the ON mode. The fan will have constant

operation at all times.

MP CONTROLLER ALARMS

The MP CONTROLLER is equipped with 6 alarm indicators. Some of the more common alarms

are listed below.

Loss of evaporator airflow Dirty Air Filter

Drain pan overflow Check heater.

Compressor(s) high/low pressure Smoke Detector