30
CHART 5 -- OUTDOOR UNIT PROTECTS
Suction and head
equal?
Outdoor coil clean? Clean coil. Problem
persists?
Check sensors.
Flow Chart #2
Connect gauges to
unit. Pressures ok?
Check compressor
Normal suction,
high head?
Non condensables
in sys. Pump down
and recharge unit
High head, high
suction?
Unit is overcharged.
Reclaim charge and
weigh in correct charge
High head, low
suction?
Yes
No
No No No
Problem solved
No No
Yes
Yes
Yes
Yes
Yes Yes Yes
Check application
limits
Check outdoor unit
board. Indicator light
flashing twice?
No
See note below
*
* Restriction in system. Check capillary tube, check for moisture, and check for damage to liquid line between indoor and
outdoor units.
Suction and head
equal?
Outdoor coil clean? Clean coil. Problem
persists?
Check sensors.
Flow Chart #2
Connect gauges to
unit. Pressures ok?
Check compressor
Normal suction,
high head?
Non condensables
in sys. Pump down
and recharge unit
High head, high
suction?
Unit is overcharged.
Reclaim charge and
weigh in correct charge
High head, low
suction?
Yes
No
No No No
Problem solved
No No
Yes
Yes
Yes
Yes
Yes Yes Yes
Check application
limits
Check outdoor unit
board. Indicator light
flashing twice?
No
See note below
*
* Restriction in system. Check capillary tube, check for moisture, and check for damage to liquid line between indoor and
outdoor units.
A08182
38/40MVC, MVQ