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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.
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.)
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)?
3
Is Td1 higher than Td2 when only No. 1
compressor is running (when CC (Numbers
of Running Compressor) is "1")?
4
Is the total of iE (Indoor Ex. Valves Opening)
abnormally low or high?
5
Is TL (Liquid Pipe Temp. of I.U. Heat
Exchanger) lower than Ti (Intake Air Temp.
of I.U.)?
6
Is TG (Gas Pipe Temp. of I.U. Heat
Exchanger) lower than Ti (Intake Air Temp.
of I.U.)?
7
Is there any excessive difference among I.U.
at SHTG-TL of I.U. heat exchanger? (It is
applicable when Intake Air Temp. is 3deg.
higher than Setting Temp.)
8
Is there any I.U. with the I.U. heat exchanger
SHTG-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.)
9
Is there any I.U. with SH excessively lower
than other units' value, under the condition of
iE (I.U. Ex. Value) "100"?
10
Is the difference between Discharge Air Temp.
And Intake Air Temp. more than 7 deg.?
1-128
Check Item
Standard
Running Horse-
*
Low: Insufficient
power of Indoor
Refrigerant
Units X 15Hz
*
High: Excessive
Refrigerant
*
DSW for I.U.
Capacity; Incorrect
Setting
-
*
Fan Motor; Failure
*
PCB; Failure
*
Condenser; Failure
-
* Td Thermistor;
Incorrect Connection
or Incorrect
Mounting
Total of iE:
*
Low: Excessive
Horsepower of
Refrigerant
Outdoor Unit X
*
High: Insufficient
(5 to 30)
Refrigerant,
It is normal
*
TL Thermistor;
when TL-Ti<-5.
Failure
*
Ex. Valve; Fully
Closed
*
Short-Circuit
It is normal
*
TG Thermistor;
when TG-Ti<-5.
Failure
*
Ex. Valve; Fully
Closed or Slightly
*
Open
Short-Circuit
It is normal if the
*
TL/TG Thermistor;
difference
Failure
among units is
*
Ex. Valve; Fully
within 7 deg.
Open, Slightly Open
or Fully Closed
It is normal if SH
*
Ex. Valve; Locked
is within 3 deg.
with Fully Open
lower than other
*
Mismatched between
units.
Wiring and Piping
It is normal if SH
*
Ex. Valve; Locked
is within 3 deg.
with Slightly Open
higher than other
or Closed
units.
*
Mismatched between
Wiring and Piping
-
Result
Causes
-
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Table of Contents
Troubleshooting
