Carrier SUPRA 850Mt Operation And Service Manual page 36

defrost switch will override this mode and start a new 45
minute cycle. When defrost override is active, the ap-
propriate alarmwillbe indicated. If the run relay isde-en-
ergized during defrost, defrost is terminated.
2.8.11 Continuous or Start/Stop Operation
Micro units have two basic operating modes : contin-
uous or start/stop. Selection is possible either in both
engine or standby mode operation.
Continuous mode is adequate when load type requi-
red constant airflow for better conservation. Control of
temperature is done by alternate cooling or heating of
the supply air around setpoint.
Start/stop mode provides an energy efficient alterna-
tive to continuous operation by automatic cycling (off or
on) the diesel engine or standby motor near setpoint.
a. Auto Start/Stop - Continuous
When configuration CNF11 is "ON" and setpoint is 32
to42 F (0to5.5 C) the unit is locked intocontinuous
_ _
run. Start/Stop Continuous key is disabled.
A key is provided to select between continuous run
and auto start/stop operating mode. In the continuous
run mode, the diesel engine will not shut down except
for safeties or if the engine stalls. This function also ap-
ply to the operation of the electric motor.
b. Auto Mode Indicator
The "Auto start/stop" light is lit to indicate the auto
start/stop mode has been selected.
c. Auto Start failure
If the unit fails to start, shuts downon a safety, orfails
to run for the minimum run time, three consecutive
times, the "Start/Fail" alarm is activated.
2.8.12 Optional control panel
User-friendly indicator and operator control panels
clearly show individual compartment temperatures with
easy-to-read displays.
These compact panels can be mounted to suit the
individual operator's preferences.
(Example : on the front bulkhead, in the cab or in the
refrigerated compartment -- including mounting in the
truck wall itself.)
NOTE
Control panel
D
1.
2.
3.
1. Compartment ON/OFF key
2. Control panel power on light
3. Unit ON/OFF key
4. Manual defrost key
5. Control panel locking light
6. Up and down arrow keys
7. Heating operating mode light of a compartment
8. Cooling operating mode light of a compartment
9. Temperature indicated in
From this control panel (option) you can :
- switch on the unit
- check compartement 1, 2 or 3 temperatures
- change setpoints
- energize a manual defrost ( refer to Section
1.8.11 )
- The detailed control panel fonctioning is
explained in Section 2.4.2
d. Auto Start Sequence (Engine mode)
The unit is in Heat mode for the 30s prior to energising
the start sequence and 30s after unit start, in engine
standby mode.
When the starting conditions are met, the start se-
quence will begin by energizing the run relay, and after
5 seconds energize the glow plug relay (GPR) to supply
power to the glow plugs, and 5 seconds later the starter
is energized. On initial power-up, the control will delay
5 seconds before the startingsequencebegins. If there-
quired glow time is zero, the control will energize the
starter after a 5 second delay. After a period of time , the
starter solenoid (SS) is energized to crank the engine.
The engine will crank for 10 seconds or until engine o-
peration is sensed by the alternator signal. The glow
relay is de-energized after the auxiliary input is sensed
2-24
9.
8.
7.
6.
5.
4.
C or F
_ _
NOTE
62--611XX- -20 (03/04)