8
REFRIGERATION SYSTEM DIAGNOSIS GUIDE
COMP.
DIS-
CHARGE
Very hot
Slightly
warm
to hot
Hot
Very hot
Room temp.
(cool)
Cool to hot
CON-
DENSER
Very hot
Warm
Top pass
warm
Lower pass
cool (near
room temp)
due to liquid
Room temp.
Room temp.
Room temp.
CAPILLARY
TUBE
Warm
Cool
Warm
Room temp.
(cool) or
colder
Room Temp.
(cool)
Room temp.
(cool)
EVAP.
Cold
Cold
Extremely
cold neat
inlet - Outlet
below room
temp.
Extremely
cold near
inlet - Outlet
below room
temp
No refrigera-
tion
No refrigera-
tion
WATTAGE
Normal
Higher than
normal
Lower than
normal
Lower than
normal
Lower than
normal
Lower than
normal
SUCTION
LINE
Slightly
below room
temp.
Very cold
may frost
heavily
Warm -
near room
temp.
Warm -
near room
temp.
Room temp.
(cool)
Room temp.
(cool)
COMPRESSOR WINDING RESISTANCE
To measure start winding resistance, measure across the Common (C) and Start (S) pins.
To measure run winding resistance, meausre across the Common (C) and the Run (R) pins.
When measuring resistance between the Common (C), Start (S) or Run (R) pins to ground, meter
should read infinity. Any resistance indicates a shorted compressor.
Specifications:
Start Winding Resistance C to S:
28 ohms
Run Winding Resistance C to R:
8 ohms
Pin Configuation:
C = Common
R = Run
S = Start
S
C
R
Pin Configuation
SYSTEM
CONDITION
NORMAL
OVER-
CHARGE
UNDER-
CHARGE
PARTIAL
RE-
STRICTION
COMPLETE
RE-
STRICTION
NO GAS
SUCTION
PRESSURE
Normal
Higher than
normal
Lower than
normal
Somewhat
lower than
normal-in
vacuum
In deep
vacuum
0PSIG
to
25" vacuum
