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TROUBLESHOOTING
(3) Check Item after Sampling Data
a. Cooling Operation (It is applicable when outdoor temperature is higher than 15°C.)
No. Check Item Standard Result
1 Is
H1 (Compressor Frequency) +
(
CC (Numbers of Running Compressor) -1)
X (*) abnormally low or high?
(It is applicable when Intake Air Temp.
is 3 deg. higher than Setting Temp.)
Running Horse-
power of Indoor
Units X 15Hz
*
*
*
Low: Insufficient
Refrigerant
High: Excessive
Refrigerant
DSW for I.U.
Capacity; Incorrect
Setting
2 Is fan actually running at "HIGH" speed when
Fo (Air Flow Rate of Fan) is "15" (5 to 20HP)
or "16" (24 and 30HP)?
-*
*
*
Fan Motor; Failure
PCB; Failure
Condenser; Failure
3 Is Td1 higher than Td2 when only No. 1
compressor is running (when
CC (Numbers
of Running Compressor) is "1")?
-*Td Thermistor;
Incorrect Connection
or Incorrect
Mounting
4 Is the total of
iE (Indoor Ex. Valves Opening)
abnormally low or high?
Total of iE:
Horsepower of
Outdoor Unit X
(5 to 30)
*
*
Low: Excessive
Refrigerant
High: Insufficient
Refrigerant,
5 Is TL (Liquid Pipe Temp. of I.U. Heat
Exchanger) lower than Ti (Intake Air Temp.
of I.U.)?
It is normal
when TL-Ti<-5.
*
*
*
TL Thermistor;
Failure
Ex. Valve; Fully
Closed
Short-Circuit
6 Is TG (Gas Pipe Temp. of I.U. Heat
Exchanger) lower than Ti (Intake Air Temp.
of I.U.)?
It is normal
when TG-Ti<-5.
*
*
*
TG Thermistor;
Failure
Ex. Valve; Fully
Closed or Slightly
Open
Short-Circuit
7 Is there any excessive difference among I.U.
at SH
TG-TL of I.U. heat exchanger? (It is
applicable when Intake Air Temp. is 3deg.
higher than Setting Temp.)
It is normal if the
difference
among units is
within 7 deg.
*
*
TL/TG Thermistor;
Failure
Ex. Valve; Fully
Open, Slightly Open
or Fully Closed
8 Is there any I.U. with the I.U. heat exchanger
SH
TG-TL excessively different from other
units' value and is iE lower than "7"? (It is
applicable when Intake Air Temp. is 3 deg.
higher than Setting Temp.)
It is normal if SH
is within 3 deg.
lower than other
units.
*
*
Ex. Valve; Locked
with Fully Open
Mismatched between
Wiring and Piping
9 Is there any I.U. with SH excessively lower
than other units' value, under the condition of
iE (I.U. Ex. Value) "100"?
It is normal if SH
is within 3 deg.
higher than other
units.
*
*
Ex. Valve; Locked
with Slightly Open
or Closed
Mismatched between
Wiring and Piping
10 Is the difference between Discharge Air Temp.
And Intake Air Temp. more than 7 deg.?
- -
Causes
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