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7–11
T-359
7.5.2
Replacing High Pressure Switch
a. Remove the refrigerant charge.
b. Disconnect wiring from defective switch. The high pressure switch is located on the discharge connection
or line and is removed by turning counterclockwise.
c. Install a new high pressure switch after verifying switch settings.
d. Evacuate, dehydrate and recharge system.
e. Start unit, verify refrigeration charge and oil level.
7.6
CONDENSER COIL
The condenser consists of a series of parallel copper tubes expanded into copper fins. The condenser coil must
be cleaned with fresh water or steam so the air flow is not restricted. To replace the coil, do the following:
CAUTION
!
Do not open the condenser fan grille before turning power OFF and disconnecting power plug.
a. Using a refrigerant reclaim system, remove the refrigerant charge.
b. Remove the condenser coil guard.
c. Unsolder discharge line and remove the line to the receiver.
d. Remove coil mounting hardware and remove the coil.
e. Install replacement coil and solder connections.
f. Leak-check the coil connections per
. Evacuate the unit then charge the unit with refrigerant.
7.7
CONDENSER FAN AND MOTOR ASSEMBLY
CAUTION
!
Do not open condenser fan grille before turning power OFF and disconnecting power plug.
The condenser fan rotates counter-clockwise (viewed from front of unit), pulls air through the condenser coil, and
discharges horizontally through the front of the unit. To replace motor assembly:
a. Open condenser fan screen guard.
b. Loosen two square head set screws on fan. (Thread sealer has been applied to set screws at installation.)
c. Disconnect wiring connector.
CAUTION
!
Take necessary steps (place plywood over coil or use sling on motor) to prevent motor from
falling into condenser coil.
d. Remove motor mounting hardware and replace the motor. It is recommended that new locknuts be used
when replacing motor.
e. Connect the wiring connector.
f. Install fan loosely on motor shaft (hub side in). DO NOT USE FORCE. If necessary, tap the hub only, not the
hub nuts or bolts. Install venturi. Apply “Loctite H” to fan set screws. Adjust fan within venturi so that the
outer edge of the fan is within 2.0 +/- 0.07 mm (0.08" +/- 0.03") from the outside of the orifice opening. Spin
fan by hand to check clearance.
g. Close and secure condenser fan screen guard.
Summary of Contents for 69NT40-561-019
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