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62-11637
8–34
WARNING
!
Do not unscrew enclosing tube nut all the
way before breaking seal. Entrapped
pressure could result in injury.
4. Loosen the enclosing tube nut (see
using installation/removal tool supplied with
repair kit. Ensure tube is loose and seal is bro-
ken then remove tool, enclosing tube nut,
enclosing tube, plunger with plunger spring and
o-ring.
5. Check plunger for restriction due to: (a) cor-
roded or worn parts; (b) foreign material lodged
in valve; (c) bent or dented enclosing tube.
6. Install new parts. Do not over tighten enclosing
tube assembly. Torque to 100 inch/lbs (11.3
Nm).
7. Remove tool and install coil, refer to preceding
step b.
8. Leak check, evacuate & dehydrate, and charge
system as required. Refer to
,
&
9. Check operation, refer to preceding step a.
d. Unloader Valve Replacement
1. Pump down the compressor. Refer to
.
2. Disconnect and remove coil.
WARNING
!
Do not unscrew unloader valve body
mounting bolts all the way before break-
ing seal. Entrapped pressure could result
in injury.
3. Loosen the valve body mounting bolts. Tap the
valve body to break the seal and then remove
bolts and gasket.
4. Remove small screen from inside the compres-
sor head and ensure it is not obstructed. Clean
or replace as required.
5. Place a new gasket onto the replacement
unloader valve body (with flat side toward the
head) and, using unloader ring pliers, (Carrier
Transicold P/N 07-00223-00) compress the
unloader ring while inserting the unloader into
the compressor head.
6. One valve body mounting hole is offset to assist
in correctly aligning the valve body and gasket.
Insert mounting bolts, align with gasket holes
and mounting holes in head. Start bolts by hand
and then toque mounting bolts 12 to16 ft-lbs
(1.3 to 1.8 Nm).
7. Leak check, evacuate & dehydrate, and charge
system as required. Refer to
,
&
8. Check operation, refer to preceding step a.
8.9
REFRIGERANT SYSTEM COMPONENT SER-
VICE
8.9.1
Evaporator Coil
The use of recycled cardboard cartons is increasing
across the country. The recycled cardboard cartons
create much more fiber dust during transport than
“new” cartons. The fiber dust and particles are drawn
into the evaporator where they lodge between the coil
fins. If the coil is not cleaned on a regular basis, some-
times as often as after each trip, the accumulation can
be great enough to restrict air flow, cause coil icing,
repetitive defrosts and loss of unit capacity. Due to the
“washing” action of normal defrost the fiber dust and
particles may not be visible on the face of the coil but
may accumulate deep within.
Clean the evaporator coil on a regular basis, not only to
remove cardboard dust, but to remove any grease or
oil film which sometimes coats the fins and prevents
water from draining into the drain pan.
Cardboard fiber particles after being wetted and dried
several times can be very hard to remove. Therefore,
several washings may be necessary.
1. Ensure the unit will not start automatically by
disabling any two way communication and plac-
ing the STOP/RUN-OFF switch in the OFF posi-
tion.
2. Remove rubber check valves (Kazoo) from drain
lines of the evaporator to be cleaned.
3. Spray coil with a mild detergent solution such as
Oakite 164 or 202) or any good commercial
grade automatic dish washer detergent such as
Electrosol or Cascade and let the solution stand
for a few minutes and reverse flush (opposite
normal air flow) with clean water at mild pres-
sure. A garden hose with spray nozzle is usually
sufficient. Make sure drain lines are clean.
4. Re-install check valves and run unit until Defrost
Mode can be initiated to check for proper drain-
ing from drain pan.
Содержание Transicold X4 7300
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