Thermo King RD-MT - Operating Modes; Engine, Continuous Run-Two Compartment Operation

Unit Description
35
Operating Modes
High Speed Heat is normally locked out at
setpoints below 15 F (-9.4 C).
Engine, Continuous Run—Two
Compartment Operation
Zone 1 Evaporator: At setpoints above 15 F
(-9.4 C), the Zone 1 evaporator operates in the
following modes.
• Cool
• Null*
• Heat
• Defrost
At setpoints below 15 F (-9.4 C), the Zone 1
evaporator operates in the following modes.
• Cool
• Null*
• Defrost
*Heat if the Zone 2 evaporator is in Null or Off.
Zone 2 Evaporator: At setpoints above 15 F
(-9.4 C), the Zone 2 evaporator operates in the
following modes.
• Cool
• Null
• Heat
• Defrost
At setpoints below 15 F (-9.4 C), the Zone 2
evaporator operates in the following modes.
• Cool
• Null
• Defrost
0. Setpoint
1. Temperature Drop
2. Temperature Rise
3. Cool—Force Condensing Unit to High Speed
4. Cool
5. Null (Heat if Other Evaporator is in Null or Off)
6. Heat—Force Condensing Unit to High Speed
(Null if Setpoint is Below 15 F [-9.4 C], unless
Other Evaporator is in Null or Off)
Figure 5: Zone 1 Evaporator Engine, Continuous
Run, Two Compartment Control Algorithm
0. Setpoint
1. Temperature Drop
2. Temperature Rise
3. Cool—Force Condensing Unit to High Speed
4. Cool
5. Null
6. Heat—Force Condensing Unit to High Speed
(Null if Setpoint is Below 15 F [-9.4 C])
Figure 6: Zone 2 Evaporator Engine, Continuous
Run, Two Compartment Control Algorithm