YORK Technical Guide Code 035T76009-000
AIR BLOWER
9
9 - UNIT CONTROLLER OPERATION
EMERGENCY OPERATION
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.
AUTO RESTART FUNCTION
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.
ANTI-ICE AND ANTI OVERHEATING
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.
LOW VOLTAGE
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.
SYSTEM OPERATION MODE
SELECTION
There are five different operating modes;
Cool Only and Heat Pump Units
- Cooling mode
Heat Pump Units Only
- Dry mode
- Automatic mode
- Fan mode
- Heating 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.
ROOM TEMPERATURE SETTING
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.
FAN SPEED AND LOUVER
POSITION SETTING
Low - Medium - High speeds are available. Press the
FAN button
for the desired air flow. 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.
continued
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