Unit Controller Operation - York MBC-MBH 25 Installation & Owner's Manual

High static ducted electric heater with plenum

Table of Contents

Units are equipped with a switch to run in emergency operation mode.

The switch is on the infrared receiver board where the LED lights are located, or in the case of wall mount units it can

be accessed by opening the front grill. This switch is used for manual operation upon expiration of service life of

remote control batteries, or upon occurrence of a problem. Pushing the emergency switch first turns it on; pushing it

again turns it off (toggle action). During emergency operation, the remote controller cannot be used and the power

LED light will flash in intervals, while the other LED lights will indicate the operation of the Diagnostic Codes.

In Emergency Operation in cool mode, the temperature will be set at 24°C and the fan on Auto. In heating the unit will

switch to auto mode at a temperature set point of 24°C and the fan will run on auto mode.

Upon suspension of electrical power supply during operation for any reason, when supply of power resumes the unit

operation will restart automatically according to all parameters set before the suspension of power.

This feature is used to prevent the evaporator unit from freezing during cool or dry operation. During execution of

anti-ice operation and anti-overheating, the compressor will stop operating and the fan will continue to run until the

coil temperature reaches predetermined set points, at which time the unit will resume normal operation.

The feature is used to protect against any damage to the unit caused by fluctuation of voltage. If voltage is lower than

the lower limit for approximately 10 seconds or longer, compressor operation will be temporarily stopped. Normal

operation will resume when the voltage returns above the set limit for a minimum of 10 seconds.

If the time elapsed is less than 3 minutes then the compressor start up will be delayed until 3 minutes has passed.

There are five different operating modes;

Cool Only and Heat Pump Units

Cooling mode

– Dry mode

– Fan mode

(only on Cooling units)

The required mode can be selected by pressing the SYSTEM button until the corresponding mode symbol appears

on the display. In automatic mode the unit operates automatically between Cool and Heat modes based on the

change in the room temperature and the temperature set point entered on the control.

Press the TEMP button up or down to change the setting to the desired room temperature. The setting range is from

18°C to 32°C. Operating the unit below 18°C may result in the coil freezing.

Low - Medium - High speeds are available. Press the FAN button for the desired airflow. The FAN symbol shows the

speed that has been selected.

Automatic fan speed is available in Cooling and Heat modes only.

When the dehumidification mode is used, the fan speed is set automatically.

The SWEEP button is used to control the movement of the air louvers.

By pressing the button, the louver can be set in either the fixed position or by pressing again, it will move in a

sweeping motion to distribute the air in the room. Applicable only for units with air sweep.

To keep your air conditioning unit in peak condition, the filters should be cleaned regularly, i.e. once a month, or more

frequently depending on conditions. To do this;

– Remove the filters from the unit.

– Wash them in soapy water (do not use detergent).

– Dry the filters and put them back in place on the unit.

To clean the unit casing, use a damp cloth.

The control is equipped with a filter Alarm; based on the hours of operation, and indicated by all of the lights flashing

(see the Diagnostic Chart for details), to remind you to change the filter. To reset the alarm press the FIL TER button

on the remote control. If you fail to press the RESET button the alarm will automatically reset after 6 hours of operation.