Thermo King RD-II MAX User Manual

151
CYCLE-SENTRY Diagnosis
Condition Possible Cause Test Procedure
Unit will not energize the run
relay when required
Defective run relay Test run relay
Open 7A circuit from selector switch
to run relay
Test 7A circuit
Defective selector switch Test circuit from 7M to 7A on switch
in the start-stop function
Defective load temperature
thermostat
Check load temperature thermostat
in Continuous Run mode
Open D7 or D8 diodes Test D7 and D8 diodes
Defective CYCLE-SENTRY IV
module
Test CYCLE-SENTRY module
Open 53 circuit from run relay to
CYCLE-SENTRY module
Test 53 circuit
Preheat relay will not energize
when required
Defective preheat relay Test preheat relay
Open 52A circuit from preheat relay
to CYCLE-SENTRY module
Test 52A circuit
Open D7 or D8 diodes Test D7 or D8 diodes
Defective CYCLE-SENTRY module Test CYCLE-SENTRY module
Open CH circuit to
CYCLE-SENTRY module
Test CH circuit
Open 7A circuit from selector switch
to the preheat relay
Test 7A circuit
Open 2A circuit to preheat relay
(after 9-89)
Test 2A circuit
Unit will not automatically crank,
but will preheat automatically
Defective CYCLE-SENTRY module Test CYCLE-SENTRY module
Open 52 circuit from start relay to
starter
Test 52 circuit
Open 8S circuit from start relay to
starter
Test 8S circuit
Defective start relay Test start relay
Defective starter Test starter
Unit will not automatically crank,
but will preheat automatically
(continued)
Open 8 circuit to starter relay (after
9-89)
Test 8 circuit
Open 7A circuit to starter relay Test 7A circuit
Unit disengaged starter before
engine is running
Defective CYCLE-SENTRY module Test CYCLE-SENTRY module
Low battery condition Test battery under load
Defective starter Test starter in Continuous Run
mode

Thermo King RD-II MAX Specifications

General

Brand	Thermo King
Model	RD-II MAX
Category	Refrigerator
Language	English