MCi Crusader II 1989 Maintenance Manual page 121

Date
1-1-89
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3_-4_6 _ _
MC-9 MAINTENANCE MANUAL
REFRIGERATOR
The maxi galley comes equipped with a Norcold Model
776-EG3 absorption type refrigerator, which is fitted into the
front lower section of the cabinet assembly. Measuring 40½''
(102.87 cm) high x 22" (55.88 cm) wide x 22-11 / 16" (57.62 cm)
deep, the refrigerator has a storage capacity of 4 cubic feet
Other features of the refrigerator include: an adjustable shelf, a
deep full width crisper, in-door storage, and a separate freezer
compartment with two ice trays.
CAUTION: Tum refrigerator off before
charging batteries.
REMOVAL OF REFRIGERATOR
1. Tum the main battery switch "OFF."
2. Open the trash bin door on the galley. Reach in and lift
the release bar to open the window behind the maxi galley.
3. Prop open the window from outside of the coach to gain
access to the maxi galley electrical components.
4. Disconnect the red wire of the refrigerator feeder har-
ness from stud #8 of the ten terminal stud block
5. Disconnect the white wire of the refrigerator feeder har-
ness from stud #10 of the ten terminal stud block.
6. Oisconnectthe green wire of the refrigerator feeder har-
ness from the terminal near the bridge rectifier.
7. Remove and retain the th,ree clamps that secure the
·efrigerator feeder harness.
8. Remove the clamp that secures the three-prong plug
cable and unplug the refrigerator. Return to the inside of the
coach to complete the removal procedure.
9. Remove the four retaining screws from the outside
flanges of the refrigerator.
10. Remove the upper grill from the galley cabinet
11. Carefully remove the refrigerator from the cabinet.
REFRIGERATOR TROUBLESHOOTING
If the outside of the refrigerator is warm but the refrigerator
has not been cooling for an extended period of time, the
cooling system is blocked. Refer to Procedure #1 to correct a
blocked system.
Procedure #1
For proper operation of the absorption system, it is neces-
ary for the ammonia and water to mix together. If the refrigera-
tor is not kept in a level position, the ammonia will boil out of
the water, causing a blocked system. To remedy this situation,
remove the refrigerator from the coach and place it on its left
side for one hour. This will allow the water and ammonia to mix
together.
Install the refrigerator and operate it for one to two hours to
determine if the cooling process has been restored. If the
refrigerator is not cooling after this time and Procedures 2
·'7rough 6 have determined that all electrical systems are func-
ming properly, the cooling system must be removed and
- replaced.
24-Volt Operation
If the refrigerator is not cooling properly while operating on
24 volts, the following series of tests should be performed to
determine where the problem eixsts.
Procedure #2
With the main battery switch "ON" and the refrigerator
switch at the hostess station in the "24 VOLT" position, pro-
ceed as follows:
1. Open the trash bin door on the galley. Reach in and lift
the release bar to open the window behind the maxi galley.
Prop the window open to gain access to the electrical compo-
nents at the rear of the galley.
2. Using a voltmeter, determine if 24 volts is present at stud
#1 on the ten terminal stud block. If 24 volts is present at stud
#1, proceed to step 3. If 24 volts is not present, check the
20-amp circuit breaker in rear junction box. If 24 volts is not
present at the circuit breaker, it should be replaced.
3. Determine if 24 volts is present at stud #8 on the ten
terminal stud block. If no voltage is present, the refrigerator
switch at the hostess station is defective and should be re-
placed. If 24 volts is prsent at stud #8, turn the main battery
switch "OFF" and continue with step 4.
4. Open the refrigerator door. Inspect the fuse in the fuse
holder, located on the refrigerator control panel, and replace it
if it is burned out
5. Turn the main battery switch "ON" and allow the refrig-
erator to operate for about five minutes.
6. After five minutes, flip the refrigerator switch at the host-
ess station "OFF" and inspect the fuse again. If the fuse is
burned out, continue with Procedure #2. If the fuse is not
burned out, reinstall it, flip the refrigerator switch at the hostess
station to "24 VOLTS" and close the refrigerator door. Periodi-
cally check the freezer compartment to determine if the refrig-
erator is cooling properly. If the refrigerator is not cooling after
1 to 2 hours. continue with Procedure #4.
Procedure #3
If after Procedure #2 step 5, the refrigerator fuse burned
out, perform the following inspection:
1. Remove the refrigerator from the cabinet; refer to
REMOVAL OF REFRIGERATOR
2. Disconnect the yellow and black feed wires from the
refrigerator heater element feed wires.
3. Using an ohmmeter set on the R x 1 scale, check the
yellow and black lead wires to the heater element If a reading of
3.6 ohms (.±...2 ohms) is not attained, the heater element is
defective and should be replaced.
4. If a reading of 3.6 ohms (.±...2 ohms) was attained in step 3.
a short exists between the heater-element and the 15A fuse.
Inspect all connections between the heater element and the
fuse and eliminate the cause of the short.