Unit Description 5-10
SL-100, SL-100e, SL-200 and SL-200e (TG-VI Controller)
Note, Please refer to the relevant refrigeration system diagram in Chapter 18 of this manual.
Operating Characteristics of TG-VI Controller
• TG-VI 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.
• Different versions of software may provide different control sequences and operating mode switch points.
• The controller features programmable Low Speed Start. If Low Speed Start is set to [YES], the unit will start in low speed.
Low speed operation continues for a minimum of 2 minutes, or until the engine coolant temperature increases to 10 C. Factory
Low Speed Start setting is [YES] (earlier software versions could not be programmed to [NO]).
• 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 -9 C (earlier software versions were programmable to -4 C).
• 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.
• A programmable defrost timer can be set for an initial defrost interval of 2, 4 or 6 hours (factory set at 4 hours). The controller
records the time required to complete the defrost. Subsequent defrost cycles are automatically initiated based on the time
required to complete the previous defrost cycle.
Engine Operation
Continuous Mode without Modulation
• High Speed Cool
• Low Speed Cool
• Low Speed Heat
• High Speed Heat
1
• Defrost
1
High Speed Heat is locked out if controller setpoint is below -9 C.
Continuous Mode with Modulation
• High Speed Cool
• Low Speed Cool
• Low Speed Modulated Cool
1,2
• Low Speed Modulated Heat
1
• Low Speed Heat
• High Speed Heat
1
• Defrost
1
Modulation valve operation and High Speed Heat are locked out if controller setpoint is below -9 C.
2
Heat Cycle must be satisfied to allow Low Speed Modulated Cool.
CYCLE-SENTRY Mode with or without Modulation
1, 2
• High Speed Cool
• Low Speed Cool
•Null
3
• Low Speed Heat
4
• High Speed Heat
4
• Defrost
1
Modulation valve operation is locked out during CYCLE-SENTRY operation.
2
If engine temperature, battery condition or defrost initiation requires unit start-up during Null mode, unit starts and operates
in Low Speed Heat or Low Speed Cool.
3
Unit mode is Null when the engine temperature and battery are satisfied.
4
Null mode if setpoint is below -9 C.
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