Carrier High Wall Duct Free Split System 38MVC Service Manual page 33

CHART 8 - - UNIT NOT RUNNING OPTIMALLY
No No
Outdoor coil clean? Outdoor coil clean?
Yes Yes
No No
Indoor filter clean? Indoor filter clean?
Yes Yes
Check indoor fan Check indoor fan No No
motor motor
Yes Yes
Connect gauges to Connect gauges to Yes Yes
unit. Pressures ok? unit. Pressures ok?
No No
No No
Suction and head Suction and head
equal? equal?
Yes Yes
Check compressor Check compressor
* Restriction in system. Check capillary tube, check for moisture, and check for damage to liquid line between indoor and * Restriction in system. Check capillary tube, check for moisture, and check for damage to liquid line between indoor and
outdoor units. outdoor units.
Clean coil. Problem Clean coil. Problem No No
persists? persists?
Yes Yes
Clean filter. Problem Clean filter. Problem No No
persists? persists?
Yes Yes
Replace indoor fan Replace indoor fan
motor. motor.
Check application Check application
limits. limits.
No No
Normal suction, Normal suction,
high head? high head?
Yes Yes
Non condensables Non condensables
in sys. Pump down in sys. Pump down
and recharge unit and recharge unit
Problem solved Problem solved
Problem solved Problem solved
No No
High head, high High head, high
suction? suction?
Yes Yes
Unit is overcharged. Unit is overcharged.
Reclaim charge and Reclaim charge and
weigh in correct charge weigh in correct charge
33
High head, low High head, low
suction? suction?
Yes Yes
See note below* See note below*
A08170