610.020-IOM (NOV 19)
Page 18
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Maintenance
FAN MOTORS AND HEATERS
The only electrical components vulnerable to potential
malfunction are the fan motors and electrical defrost
heaters. In the event of motor or heater failure, remove
the affected motor from the unit and test separately. If
the motor or heaters continue to malfunction, it may be
necessary to replace them.
DRAIN PAN
Inspect drain pan periodically. Clean accumulated dirt
and dust with soap and warm water. If a sign of improper
drainage is apparent, check drain line pitch, drain line
heater (if applicable), and drain trap for proper operation.
Clean the unit using warm water and soap. Take special
care when cleaning the unit around the electrical areas
including motor, wiring, and junction boxes. Water could
potentially damage the electrical motor.
ROUTINE MAINTENANCE
Verify the following points when visually inspecting the
equipment:
• Screw connections are secure
• There are no leakages
• Fans operate silently
• General state of the unit such as cleanliness and corro-
sion
Cleaning the finned heat exchanger is of particular im-
portance to ensure smooth operation and long life of the
equipment.
WARNING
Before any maintenance is carried out, ALL power must
be disconnected, locked out and tagged in accordance
with the respective Lockout / Tag Out policy.
MONTHLY
Inspect coil by opening the drain pan. Clean if required.
Opening the drain pan:
1. Remove the security locks
2. Rest the drain pan on an adequate support to hold the
weight of the drain pan.
Figure 3: Drain pan
WARNING
Failure to have proper support for the drain pan could
result in serious injury or equipment damage.
Confirm defrost operation and effectiveness.
BIANNUALLY
• Confirm correct operation of all safety components.
• Clean finned surface area of the coils.
• Inspect the drain pan and clean if necessary.
• Confirm drainage from the pan is unobstructed.
• Check all strainers and replace or clean if required.
• Tighten all electrical connections.
• Check all wiring.
• Confirm motor integrity. Check and grease bearings, if
necessary.
• Check operation of all heaters (coil, pan, and drain
lines).
• Check piping insulation and repair or replace if dam-
aged.