Thermo King RD-MT - Reading Mode of Operation Charts

Unit Description
28
Reading Mode of Operation Charts
The Mode of Operation Charts use the status of
the 1K and 2K relays (or the R1K and R2K
relays) to show the thermostat demand:
D = De-energized (0 volts)
E = Energized (12 volts)
High Speed Cool—1K = D and 2K = E
Low Speed Cool—1K = D and 2K = D
Low Speed Heat—1K = E and 2K = D
High Speed Heat—1K = E and 2K = E.
The following abbreviations are used:
NO = Normally Open
NC = Normally Closed
LLS = Zone 1 Liquid Line Solenoid—NC
HGS = Zone 1 Hot Gas Solenoid—NC
SLS = Zone 1 Suction Line Solenoid—NO
F-COOL = Zone 1 Cool Lamp
F-HEAT = Zone 1 Heat Lamp
F-DEF = Zone 1 Defrost Lamp
1K = Condensing Unit Heat/Cool Relay
2K = Condensing Unit Speed Relay
DR = Condensing Unit Defrost Relay
CIS = Condenser Inlet Solenoid—NO
RLLS = Zone 2 Liquid Line Solenoid—NC
RHGS = Zone 2 Hot Gas Solenoid—NC
RSLS = Zone 2 Suction Line Solenoid—NO
R-COOL = Zone 2 Cool Lamp
R-HEAT = Zone 2 Heat Lamp
R-DEF = Zone 2 Defrost Lamp
R1K = Zone 2 Unit Heat/Cool Relay
R2K = Zone 2 Unit Speed Relay
RDR = Zone 2 Unit Defrost Relay.