Table 2-10 Battery Voltages; Figure 2-9 Main Heat Valves - - No And Nc - Carrier SUPRA 850Mt Operation And Service Manual

i. Battery voltage
Provisions are made to sense when the battery is
good. A good battery is defined as having 13.4v at 24
(75 F). This condition is used to allow shut-off of the
_
diesel engine.
If the battery voltage falls below 10v during glow
cycle, the starter will not engage and the start sequence
will continue, this is considered a failed start. The start
sequence is repeated until the unit starts or three con-
secutive start attempts have failed.

Table 2-10 Battery Voltages

Message- Voltage-
Display Level
10 or Less Unit will shut down ex-
LOW BATT
AL4
11 to 14.5 Considered as normal
17 or more Unit will shut down.
HI BATT AL5
j. Oil pressure signal
When the oil pressure switch is closed, it shows that
the engine is running and prevents engagement of the
starter motor when operating in auto mode.
k. Maximum off-time
A keypad selectable feature is provided which will
cause the engine to be started 30 minutes after the
engine has stopped regardless of the box temperature.
l. Start/Stop conditions
Unit will not cycle off if :
-- engine coolant temperature is less than 50
(122 F)
_
-- battery is less than 13.4 Volts
Unit will restart (overidding minimum off time) if
-- battery drops below 11 Volts
-- coolant temperature drops below 1
If the unit can not cycle off, it will operate normally in
continuous mode. If all temperature probes fail and the
setpoint is less or equal to - -12
shut down.
_
Description
cept during cranking.
voltage
_
C (34 F)
_ _
C(10 F) the unit will not
_ _
2-26
2.8.13 Remote Monitoring - Microlink (Optional)
The microprocessor controller is equipped with a
C
RS232 communication port. This port can be used to
communicate unit operating data to a mobile satellite
transmitter. This information will then be relayed back to
the office via a modem to a computer.
There are presently three (3) protocols supported.
Theprotocol for the QualComm transmitter, theprotocol
for the HUGHES transmitter, and Carrier Communica-
tion Protocol. The microprocessor will power up and
transmit a HUGHES protocol packet and continue to
transmit a packet every hour. The microprocessor will
transmit in the Carrier, QualComm protocol if a data
packet is requested.
2.9 REFRIGERATION COMPONENT OPERA-
TION
2.9.1 Compressor pressure regulating valve
(CPR) ( see Figure 2-1 & Figure 2-2 )
This adjustable regulating valve is installed on the
suction line of the compressor to regulate the amount of
suction pressure entering the compressor. The CPR
valve setting is the maximum suction pressure for the
compressor.
The suction pressure is controlled to avoid overload-
ing the electric motor or engine during high box temper-
ature operation.
2.9.2 Main Heat Valve MHV1 (NO) / MHV2 (NC)
C
MHV1

Figure 2-9 Main Heat Valves - - NO and NC

Description
The 2 valves govern cool or heat mode by allowing
the hot gas refrigerant to circulate from the compressor
to the condenser (cool) or to the evaporator (heat
mode).
MHV2
62--611XX- -20 (03/04)