Thermo King SLXi Spectrum, Руководство по обслуживанию

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Unit Description 5-20
SL TCI, SPECTRUM SL (Multi-Temp µP-IV Controller) and SLX/SLXe/SLXi SPECTRUM
(with Multi-temp SR-2/SR-3 Controller).
Note, Please refer to the relevant refrigeration system diagram in Chapter 19 of this manual.
Operating Characteristics of Multi-Temp µP-IV Software
• Software uses a complex algorithm to determine the unit operating mode. Therefore you can NOT predict the unit mode of
operation by comparing the setpoint to the return air temperature.
• The Host Unit (Zone 1) On-Off switch must be ON before any other zone can be operated. The unit starts automatically in
both the Continuous Run and CYCLE-SENTRY modes.
• The unit starts in Low Speed when the engine coolant temperature is less than 1 o C. Low speed operation continues until the
engine coolant temperature increases to 32
o
C.
• Engine speed is determined by a combination of the requirements of each zone and the discharge pressure. The unit operates
in low speed or high speed as required by the controller.
• Controller fresh and frozen range defrost timer intervals are factory set for 4 hours when compartment temperature is
out-of-range; and for 6 hours when compartment temperature is in-range.
Operating Characteristics of TCI and SPECTRUM Multi-Temp Systems
• All zones can cool at the same time.
• All zones can heat at the same time.
• Any zone can cool while any other zone heats.
• When any zone is in defrost, it delays cool or heat in the other zone(s).
• When a zone is in null, the blowers may operate but the zone does not cool or heat.
• When a zone is in heat while another zone is in cool, the condenser inlet solenoid is closed and the evaporator in the zone that
is in heat acts as the condenser.
• When a zone is in heat while another zone is in cool, the microprocessor will put the cooling zone(s) in the null mode when
the discharge pressure is below 1380 kPa, 13.80 bar, 200 psi.
• The condenser inlet solenoid and the suction line solenoids are normally open solenoid valves that close when energised.
• The liquid line solenoids, hot gas solenoids, receiver tank pressure solenoid and purge valve are normally closed solenoid
valves that open when energised.
• The flow of refrigerant through the system is controlled by the solenoid valves and the check valves.
• The condenser inlet solenoid is energised (closed) when any zone is in heat or defrost. If the discharge pressure exceeds 2760
kPa, 27.60 bar, 400 psi; the condenser inlet solenoid is de-energised until the discharge pressure drops below 1380 kPa, 13.80
bar, 200 psi.
• The receiver tank pressure solenoid and the purge valve are energised (open) when any zone is in heat or defrost. If the
discharge pressure exceeds 2070 kPa, 20.70 bar, 300 psi; the receiver tank pressure solenoid and the purge valve are
de-energised until the discharge pressure decreases to 1550 kPa, 15.50 bar, 225 psi.
• If all zones are in cool during engine operation, the controller will shift the engine to low speed if the discharge pressure
exceeds 2760 kPa, 27.60 bar, 400 psi. High speed may resume when the discharge pressure decreases to 2590 kPa, 25.90 bar,
375 psi.
• If all zones are in heat during engine operation, the controller will shift the engine to low speed if the discharge pressure
exceeds 2586 kPa (375 psi). High speed may resume when the discharge pressure decreases to 2068 kPa (300 psi).
Zone 1 on COOL, Zone 2 on COOL and Zone 3 on COOL
NOTE: The following example shows a TCI-3 or SPECTRUM-3 Multi-Temp system for a 3 compartment trailer. The
operation of a, TCI-2 or SPECTRUM-2 system for a 2 compartment trailer is similar.
See refrigeration system diagram on the following page. High pressure refrigerant vapor leaves the compressor and flows through
the open condenser inlet solenoid to the condenser where the refrigerant condenses into high pressure liquid. The liquid
refrigerant flows through the receiver tank into the liquid line.
The LLS liquid line solenoid is open so some of the refrigerant flows through the Zone 1 expansion valve into the Zone 1
evaporator. There liquid refrigerant cools the evaporator as it evaporates into low pressure vapor. The refrigerant returns to the
compressor through the SLCV suction line check valve and the accumulator.
The LLS2 liquid line solenoid is also open so some of the refrigerant flows through the Zone 2 expansion valve into the Zone 2
evaporator. There liquid refrigerant cools the evaporator as it evaporates into low pressure vapor. The refrigerant returns to the
compressor through the SLS2 suction line solenoid, the suction line, the SLCV2 suction line check valve and the accumulator.
The LLS3 liquid line solenoid is also open so some of the refrigerant flows through the Zone 3 expansion valve into the Zone 3
evaporator. There liquid refrigerant cools the evaporator as it evaporates into low pressure vapor. The refrigerant returns to the
compressor through the SLS3 suction line solenoid, the suction line, the SLCV3 suction line check valve and the accumulator.