Section 16. Refrigerant Circuits - Trane A4AC4018A Installer's Manual

SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback (TXV/EEV)
Liquid Refrig. Floodback
(Cap. Tube)
I.D. Coil Frosting
Compressor Runs
Inadequate or No Cooling/Htg
ELECTRICAL
Compressor & O.D. Fan
Won't Start
Compressor Will Not Start
But O.D. Fan Runs
O.D. Fan Won't Start
Compressor Hums But Won't Start
Compressor Cycles on IOL
I.D. Blower Won't Start
DEFROST
Unit Won't Initiate Defrost
Defrost Terminates on Time
Unit Icing Up
C - Cooling

Section 16. Refrigerant Circuits

88-A4AC4001-1G-EN
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C P P
H P P
C P S P S S S
H P S P S S S
C P P S
H P P S
C P S S S
H P S S S
C P S P S S S
H P S P S S S
C P P
H P P
C
H
C
H
C
H
H - Heating P - Primary Causes
1 1/2-Ton Units
P P S P
P P S
S P
S P
S P P
S
P
P S
P S
P S
P S
S P S S
S P S
S P S P P
S P S P P
P
P
P
P
P S P P S S
P S P P S S
S P S S
S P S S
P
P S
*
S - Secondary Causes - 3 Phase Only
PRINTED FROM D158513P01
S S
P S
S S S S S P
S S S S P
S P P
S P
S P S S
S S S
P P
P P
S S P
S S S
S
S P S S S S
S P S S S
S S S
S P S
P P P
P
S S P P
25