Thermo King SLXi Spectrum, Руководство по обслуживанию

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Unit Description 5-13
CYCLE-SENTRY Mode with or without Modulation
1, 2
• Cool
• Null
3
• Hot Gas Heat
4
• Full Heat
4
(hot gas and electric heaters)
• Defrost (hot gas and electric heaters)
1
Modulation valve operation is locked out during CYCLE-SENTRY operation.
2
Software versions 300 and above: If battery condition requires unit start-up during Null mode, unit starts and operates in Hot
Gas Heat or Cool.
3
Unit mode is Null when battery charge level is satisfied.
4
Null mode if setpoint is below Fresh/Frozen temperature setting.
Modulation
The modulation temperature range is factory set at -9 C to 27 C. The lower limit (-9 C) is adjustable through the keypad to -4C.
However, the upper limit (27 C) can be field adjusted from 27 C down to -4 C or -9 C depending on setting. If the upper limit is
set to -4 C or -9 C, the modulation mode is completely disabled.
The Modulation mode is disabled when the controller setpoint is above or below the modulation temperature range, when the unit
is in Defrost, and when the CYCLE-SENTRY switch is in the CYCLE-SENTRY position (except in CYCLE-SENTRY Fresh
range).
Defrost
Defrost can be manually initiated through the controller keypad, or automatically initiated by the controller defrost timer or
controller Demand Defrost algorithm. A demand defrost occurs when the difference between the return air temperature, discharge
air temperature and evaporator coil temperature becomes excessive.
Defrost can be initiated any time the evaporator coil temperature is below 7 C. If the unit is in Null (on Engine or Electric Standby
Operation), initiating defrost will cause the unit to start and operate. When a defrost cycle is initiated, the controller energises the
damper motor, pilot solenoid, heater contactor and Defrost icon. The controller maintains the In-range signal during defrost.
The unit remains in defrost until the evaporator coil temperature increases to 14 C. If the evaporator coil temperature does not
rise to 14 C within the defrost duration time limit (30 or 45 minutes), the controller terminates defrost. The evaporator then returns
to operation based on controller demand.
SL-400, SLe-400, SLX/SLXe/SLXi and SLX/SLXe/SLXi Spectrum (µP-VI, SR-2 and SR-3
Controller)
Operating Characteristics of µP-VI, SR-2 and SR-3 Software
• µP-VI, SR-2, and SR-3 software use complex algorithms 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.
• Different versions of software may provide different control sequences and operating mode switch points.
• The unit always starts in Low Speed. Low speed operation continuous for a minimum of 2 minutes, or until the engine coolant
temperature increases to 10 C.
• The High Speed Pull-Down (HSPD) feature controls unit operation on initial start-up. If HSPD is set to [YES], the unit
operates in High Speed (after engine warm-up) until setpoint is reached on initial unit start-up. The unit them operates in low
speed or high speed as required by the controller. Factory HSPD setting is YES.
• When the setpoint is below the Fresh/Frozen (FRFZ) temperature, High Speed Heat (or all Heat) is locked out. The Fresh/
Frozen temperature is factory set at -4 C, but may be field programmed to -4 C or -9 C.
• The Economy mode feature controls the CYCLE-SENTRY Null Range setting during CYCLE-SENTRY operation; or the
Low Speed Switch Point during Continuous Run operation. The CYCLE-SENTRY Null Range default setting is 5.6 C, but
may be field programmed from 2.8 C to 11.2 C. The Low Speed Switch Point default setting is 5.6 C, but may be field
programmed from 1.7 C to 8.4 C.
• OptiSet™ settings will determine all variable operating features for each setpoint or setpoint range programmed in
the controller.
• All units feature an electronic throttling valve (ETV) that provides a modulation cool mode as standard when the controller
setpoint is above the Fresh/Frozen temperature setting.
• When the return air temperature is within several degrees of setpoint, an In-range icon will appear in the LED display.
• During Defrost mode, unit operates in Low Speed Heat only.
• When the unit is in Null on electric standby operation, the drive motor and compressor do NOT operate.
• Controller 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.