Troubleshooting - Trane 2TTX4018B Installer's Manual

Installer's Guide
9. The liquid line shut-off valve can now be opened. Remove
shut-off valve cap. Fully insert hex wrench into the stem
and backout counterclockwise until valve stem just touches
rolled edge (approximately five [5] turns) observing
WARNING statement on page 2. See Figure 4.
10. Replace liquid service pressure tap port cap and valve
stem cap. These caps MUST BE REPLACED to
prevent leaks. Replace valve stem cap and pressure tap
cap finger tight, then tighten an additional 1/6 turn.
11. The gas valve can now be opened. Open the gas valve by
removing the shut-off valve cap and turning the valve
stem 1/4 turn counterclockwise, using 1/4" Open End or
Adjustable wrench. See Figure 5.
12. The gas valve is now open for refrigerant flow. Replace
valve stem cap to prevent leaks. Again, these caps
MUST BE REPLACED to prevent leaks. Replace valve
stem cap and pressure tap cap finger tight, then tighten
an additional 1/6 turn. See Figure 5.
If refrigerant lines are longer than 15 feet and/or a
different size than recommended, it will be necessary to
adjust system refrigerant charge upon completion of
installation. See unit Service Facts.
F. ELECTRICAL CONNECTIONS
WARNING
!
When installing or servicing this equipment, ALWAYS
exercise basic safety precautions to avoid the possibility of
electric shock.
1. Power wiring and grounding of equipment must comply
with local codes.
2. Power supply must agree with equipment nameplate.
3. Install a separate disconnect switch at the outdoor unit.
4. Ground the outdoor unit per local code requirements.
5. Provide flexible electrical conduit whenever vibration
transmission may create a noise problem within the
structure.
6. The use of color coded low voltage wire is recommended
to simplify connections between the outdoor unit, the
thermostat and the indoor unit.
Table 1 — NEC Class II Control Wiring
24 VOLTS
WIRE SIZE
18 AWG
16 AWG
14 AWG
7. Table 1 defines maximum total length of low voltage
wiring from outdoor unit, to indoor unit, and to thermostat.
8. Mount the indoor thermostat in accordance with instruc-
tion included with the thermostat. Wire per appropriate
hook-up diagram (included in these instructions).
4
MAX. WIRE LENGTH
150 FT
225 FT.
300 FT.
G. COMPRESSOR START UP
After all electrical wiring is complete, SET THE THERMO-
STAT SYSTEM SWITCH IN THE OFF POSITION SO
COMPRESSOR WILL NOT RUN, and apply power by
closing the system main disconnect switch. This will activate
the compressor sump heat (where used). Do not change the
Thermostat System Switch until power has been applied for
one (1) hour. Following this procedure will prevent potential
compressor overload trip at the initial start-up.
H. OPERATIONAL AND CHECKOUT
PROCEDURES
Final phases of this installation are the unit Operational and
Checkout Procedures which are found in this instruction (see
page 8). To obtain proper performance, all units must be
operated and charge adjustments made in accordance with
procedures found in the Service Facts.
I. ELECTRIC HEATERS
Electric heaters, if used, are to be installed in the air han-
dling device according to the instructions accompanying the
air handler and the heaters.
J. START CONTROL
Some models have quick start components which are factory
installed. For models that do not have factory installed start
components, provisions are made for a field installed start kit
accessory. When adding an accessory, follow the instructions
provided with the kit.
K. OUTDOOR THERMOSTAT
An outdoor thermostat TAYSTAT250B may be field installed.
For data, see wiring diagram attached to unit and instruction
sheet packaged with outdoor thermostat.
L. XL SEACOAST SHIELD
All units are shipped with a black Seacoast Salt Shield
attached to the coil. Removal of the shield will potentially
shorten the life of the joints in the outdoor coil.
IMPORTANT:
See Limited Warranty information in Use and Care Manual.
M. TROUBLESHOOTING
TROUBLESHOOTING CHART — WHAT TO CHECK
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Liquid Pressure Too High
Liquid Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback TXV System
Liquid Refrig. Floodback Capillary Tube System
I.D. Coil Frosting
Compressor Runs Inadequate or No Cooling
ELECTRICAL
Compressor & O.D. Fan Do Not Start P P
Compressor Will Not Start But O.D. Fan Runs P S P P
O.D. Fan Won't Start P P
Compressor Hums But Won't Start P P P
Compressor Cycles on IOL P S P P
I.D. Blower Won't Start P S
P - Primary Causes S - Secondary Causes
P P S P S
S P S
S P P S
S
S
P S S
P
S P P S
S P P P
P S
P S S
P S P S P S S S
S P P
18-AC54D1-4
S S
S S S
P
S P S
S
S P
P S
S P S
S S