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TABLE 4. 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- Cooling H - Heating P - Primary Causes S - Secondary Causes
TABLE 5. Operational And Checkout Procedures
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.
After installation has been completed, it is recommended that the entire system be checked against the following list:
Be sure unit suspension(if used) is secure and that
1.
thereare no tools or loose debris in or around or on
top of the unit......................................................
2. Properly insulate suction lines and fittings. .........
3. Properly secure and isolate all refrigerant lines...
4. Verify that all electrical connections are tight. .....
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
P
P
S
S
P
H
P
P
S
P
C
P
P
H
P
P
S
C
P
P
H
P
P
C
P
S
H
P
S
C
P
P
S
P
S
P
H
P
P
S
P
S
P
C
H
C
H
C
H
[ ]
[ ]
[ ]
[ ]
P
P
S
P
P
P
S
S
P
S
P
S
P
P
S
P
P
S
P
S
S
P
S
S
S
P
S
S
P P
S
P
P
P
P
P
P
S
S
S
S
P
P
S
5.Check all duct outlets; they must be open and unrestricted.
6.Check drain lines and be sure all joints are tight...............
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. ...............................................................................
S
S
P
S
S
S
S
S
P
S
S
S
S
P
S
S
P
P
S
P
S
P
S
S
S
S
S
P
P
P
P
S
S
P
S
S
S
S
P
S
S
S
S
S
S
S
S
P
P
P
S
S
P
P
S
S
S
S
S
S
[ ]
[ ]
[ ]
[ ]
19
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