Literature Order Number
P.I.
2/03
File Number
Supersedes
Stocking Location
Trane has a policy of continuous product and product data improvement and it reserves the right to change
design and specifications without notice.
Trane
A business of
American Standard Companies
www.trane.com
Installer’s Guide
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:
1. Refrigerant Line, Leak checked .................................. [
]
2. Suction Lines and Fittings properly insulated ........... [
]
3. Have all Refrigerant Lines been secured and
isolated properly? ........................................................ [
]
4. Have passages through masonry been sealed?
If mortar is used, prevent mortar from coming
into direct contact with copper tubing ........................ [
]
5. Verify tightness of all electrical connects ................... [
]
6. Observe outdoor fan during on cycle for clearance
and smooth operation ................................................. [
]
7. Indoor coil drain line drains freely. Pour water
into drain pan .............................................................. [
]
8. Supply registers and return grilles open and
unobstructed ............................................................... [
]
9. Return air filter installed ............................................ [
]
10. Thermostat thermometer is accurate. Check
against a reliable thermometer. Adjust per
instructions with thermostat ...................................... [
]
11. Is correct speed tap being used?
(Indoor blower motor) ................................................. [
]
12. Operate complete system in each mode to
insure safe operation. .................................................. [
]
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback (TXV)
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
WHA
T
TO
CHECK MODE
PO
WER SUPPL
Y
HIGH V
O
LTA
GE
WIRING
COMPRESSOR IOL
RUN CAP
AC
IT
OR
ST
AR
T CAP
AC
IT
OR
ST
AR
T RELA
Y
CONT
AC
TOR CONT
ACTS
LO
W V
O
LTA
GE
WIRING
CONTR
OL TRANSFORMER
THERMOST
AT
CONT
AC
TOR COIL
LO
W V
O
LTA
GE
FUSE
STUCK COMPRESSOR
INEFFICIENT COMP
.
REF
. UNDERCHARGE
REF
. O
VERCHARGE
EXCESSIVE EV
AP
. LO
AD
NONCONDENSABLES
RES
. O
.D
. AIRFLO
W
O
.D
. AIR RECIRCULA
TION
TXV STUCK OPEN
SUPERHEA
T
RES
. I.D
. AIRFLO
W
REF
. CIR.
RESTRICTIONS
SO
V LEAKING
SO
V COIL DEFECTIVE
CHECK V
AL
VE
LEAKING
*
DEFR
OST RELA
Y DEF
.
DEFR
OST CONTR
OL DEF
.
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
P
P
P
P
S
S
S
S
P
P
P
P
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
P
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
S
S
S
S
S
S
S
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
S
S
P
P
P
P
C - Cooling H - Heating P - Primary Causes S - Secondary Causes
*
- 3 Phase Only
TROUBLESHOOTING CHART — WHAT TO CHECK
2TWR2-IN-1B
SV-UN-S/SP-2TWR2-IN-1B
2TWR2-IN-1A
PI Louisville & Webb/Mason-Houston