RS5280001 Rev. 0
22
System Diagnosis
Pressure and Temperature Relationship Chart
See “Service Procedures” section for additional information about items in this chart.
For specific temperatures and pressure, see Technical Data Sheet for unit being repaired.
Condition
Suction
Pressure
Variation
from Normal
Head
Pressure
Variation
from Normal
T1 Inlet
Temperature
Variation
from Normal
T2 Outlet
Temperature
Variation
from Normal
T3 Suction
Temperature
Variation
from Normal
Wattage
Variation
from Normal
Refrigerant
Overcharge
Increase
Increase
Warmer
Warmer
Colder
Increase
Refrigerant
Shortage
Decrease
Decrease or
Increase
(Restriction
Symptoms)
Colder
Warmer
Warmer
Decrease
Partial
Restriction
Decrease
Decrease or
Increase
(Restriction
Symptoms)
Colder
Warmer
Warmer
Decrease
Air in
system
Near Normal
Increase
Warmer
Warmer
Warmer
Increase
Low
Ambient
Installation
(Reverse
from High
Ambient
Installation)
Decrease
Decrease
Colder
Warmer
Warmer
Decrease
Additional
Heat Load
Increase
Increase
Warmer
Warmer
Warmer
Increase
Inefficient
Compressor
Increase
Normal or
Decrease
Warmer or
Colder
Warmer
Warmer
Decrease