Carrier 40 - Sequence of Operation; Perishable and Frozen Mode Operation; Configuration Settings

2-4
62-10630 Change 07/03
2.8 SEQUENCE OF OPERATION
General operation sequences for cooling, null, and
heating are provided in the following subparagraphs.
2.8.1 Perishable Mode
Theunit operates in theperishablemode with set points
above 10°F(--12°C)
a. With supply air temperature above set point and de-
creasing, the unit will be cooling with the compressor
and evaporator fans operating. The condenser fan
will operate for the first three minutes after start up
thenoperateunderthecontrolofthecondenserpres-
sure switch (HP2). the green unit operating data led
will be flashing then go to a steady illumination asset
point is approached.
b. Once temperature decreases to thecontrol point,the
unitwillenterthenullmodewithnocomponentsoper-
ating. If the unit is operating on standby, a 5 minute
delay is required before restart is allowed.
c.Iftemperatureincreasesduringthenullmode,theunit
will restart in cooling.
d. If temperature continues to decrease the unit will en-
ter the heating mode with the with the compressor
and evaporator fans operating and the hot gas valve
(SV4 energized open). The condenser fan and con-
denser pressure control valve will operate under the
controlofthecondenser pressureswitch(HP2). Ifthe
heat option is installed, those heaters will also be en-
ergized.
+1_C(+1.8_F)
or +2_C(+3.6_F)
or +3_C(+5.4_F)
SET-POINT
-- 1 _C(--18_F)
or --2_C(--3.6_F)
or --3_C(--5.4_F)
(setting)
COOL
UNIT STOPPED
HEAT
Figure 2-2 Operating Sequence -- Perishable Mode
2.8.2 Frozen Mode
Theunitoperatesinthefrozenmodewithsetpointsator
below10°F(--12°C).Operationinthefrozenmodeisthe
same as in the perishable mode except the heat relays
are locked out and no hot gas or electric heating takes
place.
+1_C(+1.8_F)
or +2_C(+3.6_F)
or +3_C(+5.4_F)
SET-POINT
-- 1 _C(--18_F)
or --2_C(--3.6_F)
or --3_C(--5.4_F)
(setting)
COOL
UNIT STOPPED
2.9 CONFIGURATION
To access the configuration menu, press the
configuration button (see Figure 2-3) located on the
rear of Cab Command. Press the button once only to
enter the menu.
Configuration
button
Figure 2-3 Configuration Button
NOTE
If when settings are adjusted, no key is acti-
vated within 5 sec. the system reverts to dis-
playing the box temperature. All changes
made are recorded with OFF/ON.
TEMPERATURE UNIT
Ut_
__
_C : Celsius degree display
Ut_
__
_F : Fahrenheit degree display
Press the + and -- keys to change Ut_C
or Ut_F.
Press the SET key to validate.