J4AC3 Installation Manual

22
1.
[ ]
2. Properly insulate suction lines and fittings. .........
5.Check all duct outlets; they must be open and unrestricted.
6.Check drain lines and be sure all joints are tight...............
[ ]
3. Properly secure and isolate all refrigerant lines... [ ]
Be sure unit suspension(if used) is secure and that
thereare no tools or loose debris in or around or on
top of the unit......................................................
4. Verify that all electrical connections are tight. .....
[ ]
After installation has been completed, it is recommended that the entire system be checked against the following list:
Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance,
all units must be operated and charge adjustments made in accordance with procedures found in the Service Facts
of the Outdoor Unit.
[ ]
[ ]
7.Be sure that a return air filter is installed. ..........................
[ ]
[ ]
8.Operate complete system in each mode to verify proper
performance. Verify operation of supplementary electric
heater. ...............................................................................
TABLE 6. Operational And Checkout Procedures
C- Cooling P - Primary Causes S - Secondary Causes
TABLE 5. Troubleshooting
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback (TXV)
I.D. Coil Frosting
Compressor Runs Inadequate or No Cooling/Heating
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
I.D. Blower Won’t Start
DEFROST
Unit Won’t Initiate Defrost
Defrost Terminates on Time
Unit Icing Up
C
C
C
C
C
C
C
S
S
S
P
P
P
P
P
P
P
P
S
S
S
P
S
S
S
S
P
S
S
S
S
S
P
P
S
S
S
S
S
P
S
P
P
P
S
C
C
C
C
C
P
P
P
P
P
P S
P
P
P
P
S S
S
P
P
S
S
P P
S
P
P
C
C
C
WHAT TO CHECK MODE
POWRE SUPPLY
HIGH VOLTAGE WIRING
I.D. CONTROL DEF.
COMPRESSOR CAPPACITOR.
O.D. FAN CAPACITOR
ID BLOWER CAPACITOR
CONTACTOR CONTACTS
LOW VOLTAGE WIRING
CONTROL TRANSFORMER
THERMOSTAT
CONTACTOR COIL
LOW VOLTAGE FUSE
STUCK COMPRESSOR
INEFFICIENT COMP.
REF. UNDERCHARGE
REF. OVERCHARGE
EXCESSIVE EVAP. LOAD
NONCONDENSABLES
RES. O.D. AIRFLOW
O.D. AIR RECIRCULATION
TXV STUCK OPEN
SUPERHEAT
RES. I.D. AIRFLOW
REF. CIR. RESTRICTIONS
SOV LEAKING
SOV COIL DEFECTIVE
CHECK VALVE LEAKING
LPC SENSOR DEF.
DEFORST CONTROL DEF.
T4 TEMP. SENSOR DEF.
T3 TEMP. SENSOR DEF.
HPC/HGS SENSOR DEF.