MCC 68AC430-100, Operation & Service Manual

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2--2
©
2012 Mobile Climate Control T-353 Rev. 01/2013
2.3 SEQUENCE OF OPERATION BT324
2.3.1 Functionof Keyswhen “EngineOn” andcontroller
active:
a. Plus Key - Increases interior temperature set point
by 1 ° per stroke or increases manual blower speed,
depending on displayed mode.
b. Minus Key - Decreases interior temperature set
point by 1
°
per stroke or decreases manual blower
speed, depending on displayed mode.
c. Recirculating Air/Fresh Air - Switches from Recir ­
culating Air to Fresh Air and vice-versa.
d. Blower Control - Switches on the manual blower
control.
e. Automatic Climate Control - Switches on the Au ­
tomatic Temperature Control.
f. Temperature Indicator (Key 2 + Key 3) - Shows
the inside temperature for 10 seconds. If pressed a
second time shows the outside temperature for 10
seconds (optional).
g. Reheat (optional) (Key 3 + Key 5) - Starts Reheat
mode for 3 minutes (duration adjustable).
h. Controller Off (A/C Switch To Off) - Switches
off all control functions and the display.
NOTE
The following blower steps are disabled
when the automatic climate control is on:
2-, 3-step blower: Off
Continuously adjustable blower: Off
2.3.2 Illuminating Indications (Display)
With “Engine-On” and Controller active
2.4 OPERATING INSTRUCTIONS BT324
When the engine is running, toggle the A/C Switch
to on to activate the Air Conditioning Unit.
2.4.1 Display
When the unit is ON, the display shows the interior
set point temperature. When selecting individual
functions, the display shows the corresponding
information for a short period of time. The display is
dark when the engine and control unit are OFF.
2.4.2 Interior Temperature Control
Press the Plus (1) or Minus (2) keys to set the desired
interior temperature.
The temperature can be adjusted between 64
°
F (18
°
C) and 82
°
F (28
°
C).
When the outside temperatures are below 35
°
F (2
°
C) (adjustable parameter), the cooling function
remains disabled.
2.4.3 Ventilation
When the unit is operating in Automatic Climate
Control mode, the blower speed is controlled based
on the room temperature.
However, the blowers may be switched to manual
mode of operation by pressing the blower key.
Press the Plus or Minus keys to select different
blower steps. The blowers can not be switched OFF
when Automatic Climate Control is ON.
When Automatic Climate Control is OFF, the
blowers stop when the manual control is turned to
zero.
2.4.4 Reheat (optional)
The Reheat mode is used to remove air humidity and
to help defog the windshield. Press Key 3
(Recirculating Air/Fresh Air) and Key 5 (Automatic
Climate Control) at the same time to activate Reheat.
Heating and cooling will be energized on for 3
minutes (adjustable parameter). In addition, the
blowers are switched to maximum speed and the
fresh air flap is closed. At the end of the pre-set
duration of time, the functions return to the
previously selected settings.
Reheat mode is disabled with the outside
temperature is below 35 ° F (2 ° C) (adjustable
parameter), when the sensor is not installed, or when
there is a sensor failure.
2.4.5 Temperature Indication
Press key 2 (minus) and key 3 (Recirculating
Air/Fresh Air) at the same time to display the inside
temperature for 10 seconds.
Optionally, the outside temperature may be
displayed when pressing the keys a second time.
A sensor malfunction is displayed by
“i --” or “o --” .
2.5 CHANGING BETWEEN
°
F (FAHRENHEIT) AND
°
C
(CELCIUS )
Procedures for changing the BT324 Controller
between Fahrenheit and Celsius is as follows:
a. Engine “OFF” & Ignition “ON”.
b. Press
Key 1 (plus) and Key 2 (minus) at the same
time until the display shows the word “Code” .