Thetford NR740 - Manual (Page 9)

Refrigerator Service Manual 9 DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,
DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models
Troubleshooting - Procedure I
Proper Ventilation
Ventilation is necessary for the correct operation of the refrig-
erator. Good ventilation also increases the life of the refrigera-
tor's cooling system. The current models are equipped with
built-in ventilation systems that draw cooler air through the
lower intake vent. This air is then circulated over the cooling
unit to remove excess heat from the cooling system. The heat-
ed air is then rejected through the upper vent. If this airflow is
blocked or decreased, the refrigerator will not cool correctly.
CAUTION: Do not block the vents by closet
or cabinet doors.
!
Reducing the vent area can cause the following:
Shortened life of the refrigeration-cooling unit. ■
Poor cooling performance of the refrigerator. ■
Continuous operation of the refrigerator. ■
Fast battery discharge. ■
Voiding the refrigerator warranty. ■
~
+
AC 85~132V
ORANGE
WHITE
AC IN(L)
AC IN(N)
B3P-VH
AC/DC
converter
AC/DC PART
+
-
DC OUT + RED
DC OUT - BLACK
DC INPUT
CN1
B2P-VH
FAN MOTOR
24V DC
RED BLACK
XHP-2
B2B-XH-A
CONDENSOR
COUPLING
CN2
B3P-VH VHR-3N
SK515-N
INVERTER
ELECTRONIC
CURRENT
PROTECTOR
RED
BLACK
BATTERY IN +
BATTERY IN -
FUSE
BATTERY
MONITOR
(OPTIONAL)
ELECTRONIC
THERMOSTAT
DC/DC
converter
INPUT HIGH
VOLTAGE
PROTECTOR
HIGH TEMPERATURE
PROTECTER
BUZZER (OPTIONAL)
LOW TEMPERATURE
PROTECTER
DC 39V FOR 40W
DC 41V FOR 60W
CN4
B2B-EH
EHR-2
BLACK BLACK
EVAPORATOR
THERMISTOR
AMBIENT
THERMISTOR
AMBIENT
THERMISTOR
DC/AC PART
DC 12~32V
FUSE
AR
T0
19
57
Wiring Schematic