Unit Description 5-12
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 Fresh/Frozen temperature setting.
Continuous Mode with Modulation
• High Speed Cool
• Low Speed Cool
• Low Speed Modulated Cool
1
• 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 Fresh/Frozen temperature
setting.
CYCLE-SENTRY Mode with or without Modulation
1, 2
• High Speed Cool
3
• Low Speed Cool
3
•Null
4
• Low Speed Heat
5
• High Speed Heat
5
• 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
After initial unit start-up and unit pull-down to setpoint, the controller limits Low Speed Cool operation when the controller
setpoint is below Fresh/Frozen temperature setting. On increasing compartment temperature, the unit operates in Low Speed
Cool for a maximum of 8 minutes in an attempt to reach setpoint. If setpoint is not reached within 8 minutes, the unit will
operate in High Speed Cool until setpoint is reached.
4
Unit mode is Null when the engine temperature and battery are satisfied.
5
Null mode if setpoint is below Fresh/Frozen temperature setting.
Electric Operation
Continuous Mode without Modulation
•Cool
•Null
1
•Hot Gas Heat
2
• Full Heat
2
(hot gas and electric heaters)
• Defrost (hot gas and electric heaters)
1
Null mode ONLY when the setpoint is BELOW the Fresh/Frozen temperature setting. Exceptions: SB-III SR and SMX SR
with software versions 102, 103 and 201 have Null mode at setpoints above the Fresh/Frozen temperature setting.
2
Null mode if controller setpoint is below the Fresh/Frozen temperature setting.
Continuous Mode with Modulation
•Cool
• Modulated Cool
1
•Null
2
• Modulated Heat
1, 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 if controller setpoint is below Fresh/Frozen temperature setting.
2
Null mode ONLY when the setpoint is BELOW the Fresh/Frozen temperature setting. Exceptions: SB-III SR and SMX SR
with software versions 102, 103 and 201 have Null mode at setpoints above the Fresh/Frozen temperature setting.
3
Modulated Heat mode ONLY available on SB-III SR and SMX SR with software versions 102, 103 and 201. Controller
setpoint must be above Fresh/Frozen temperature setting.
4
Null mode if controller setpoint is below the Fresh/Frozen temperature setting.
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