Carrier X4 7300 Operation & Service Manual page 249

8.9.2 Condenser Coil
a. Cleaning
NOTE
Only Clean Water Should Be Used To Wash
The Condenser. Do Not Use Any Detergents
To Clean.
Remove all foreign material from the coil by reversing
the normal air flow. (Air is pulled in through the front
and discharges over the engine.) Compressed air or
water may be used as a cleaning agent. Take care so
that the fins aren't bent during this procedure.
b. Condenser Replacement
NOTE
If the condenser coil (Item 6,
requires replacement, the entire condenser/
radiator assembly (1) must be removed from
the unit and disassembled/reassembled on
the bench.
1. Remove the refrigerant charge. Refer to
tion 8.7.2.
2. Drain coolant into a suitable container by remov-
ing coolant bottle cap and then the engine drain
plug 8, Figure 8.15.
3. Remove the surround with the grille attached.
Refer to Section 8.4.3.
4. Remove remaining hoses from radiator connec-
tions.
CAUTION
!
Unit uses R404A and POE oil. The use of
inert gas brazing procedures is manda-
tory for all Carrier Transicold refrigera-
tion units; otherwise compressor failure
will occur. For more information Refer to
Technical Procedure 98-50553-00 Inert
Gas Brazing.
5. Unbraze refrigerant lines from condenser coil.
Figure 8.33)
Sec-
8–35
6. Disconnect the hail and bug screen sufficient to
reach the ambient sensor (2,
wiring. Remove sensor and wiring from Front
Condenser Frame (3).
7. Remove the captive washer screws (11) secur-
ing the condenser/radiator assembly to the unit.
8. Remove the condenser/radiator assembly from
the unit.
9. Remove the eight bolts (10) securing the rear
condenser frame to the front condenser frame
(2) and set rear frame aside.
10. Separate the radiator (8) from the condenser/
radiator assembly by removing the top radiator
mounting brackets (5) and removing grommets
in the bottom brackets. Set radiator aside.
11. .Remove condenser coil by removing the con-
denser coil mounting brackets (7).
12. Reassemble condenser/radiator assembly in
reverse order using new coil and new gaskets
as required. Torque all condenser/radiator
bracket and frame mounting bolts 36 to 60 inch/
lbs (4.1 to 6.8 Nm).
CAUTION
!
Do not bend the copper tubing on the
condenser coil when installing the new
condenser. Bend the unit tubing if tubes
do not align correctly.
13. Reassemble condenser/radiator assembly into
unit using new gaskets as required. Note the
three upper and lower curb side mounting holes
are slotted for ease of alignment. Torque con-
denser/radiator assembly mounting bolts (11) 95
to 119 inch/lbs (10.7 to 13.4 Nm). Braze con-
denser coil refrigerant connections.
14. Leak check, evacuate & dehydrate, and charge
system as required. Refer to
8.7.3 & 8.7.4.
15. Refill engine coolant. Refer to
Figure 8.30) and
Section 8.7.2,
Section 8.5.14.
62-11637