b. Data samples (cooling/heating, indoor temperature 21 – 30 °C)
No. Check item Result
1 Check the operating data after it has been operating for 20 minutes.
2 Check Pd and Td. IsTd-SH between 15 and 45 degrees?
3 Is Ps between 0.2 and 1.1 MPa?
4 Is Pd between 1.0 and 3.5 MPa? (If the outdoor temperature is high, Pd becomes high).
N O T E
Underlined
indicates a cheking item.
(3) Check item after the data sample
a. Cooling operation (this applies when the outside temperature is above 15 °C).
No. Check item Standard Causes Result
1
Is the fan currently operating when Fo (airflow rate
of outdoor unit fan) is not "0"?
—
• Fan motor failure
• PCB1 failure
•
Condenser failure
2
Is the total iE (opening of the indoor unit expansion
valves) abnormally low or high?
—
• Low: excessive refrigerant
• High: insufficient refrigerant or
excessive pressure loss in the
pipe
3
Is TL (indoor unit heat exchanger liquid pipe
temperature) lower than Ti (Indoor unit air inlet
temperature)?
It is normal when TL-Ti
< -5 °C.
• TL thermistor failure
• Indoor unit expansion valve
completely closed
•
Short-circuit
4
Is TG (indoor unit heat exchanger gas pipe
temperature)
lower than
Ti (indoor unit inlet air
temperature)?
(This
is applicable when the inlet air temperature is
3 °C higher than setting temperature).
It is normal whenTG-Ti
< -5 °C.
• TL thermistor failure
• Indoor unit expansion valve
completely closed or partially
open
•
Short-circuit
5
Is there any excessive difference between indoor
unit at
SH
(TG - TL) of indoor unit heat exchangers?
(This is
applicable when the inlet air temperature is
3 °C higher than setting).
It is normal if the
difference between units
is within 7 °C.
• TL / TG thermistor failure
• Indoor unit expansion valve
completely open, partially open
or completely closed
6
Is there any indoor unit with a heat exchanger value
of SH (TG - TL) excessively different from the value
of
other units and is
iE (opening of the indoor unit
expansion valve) less than "7"?
It is normal if SH is within
-3 °C lower than other
units.
• Indoor unit expansion valve
locked when completely open
•
Mismatched wiring and piping
7
Is there any indoor unit with a heat exchanger value
of SH (TG - TL) excessively different from the value
of
other units and is
iE (opening of the indoor unit
expansion valve) less than "100"?
It is normal if SH is within
+3 °C higher than other
units.
• Indoor unit expansion valve
locked when partially open or
closed
• Mismatched cabling and piping
8
Is the temperature difference between indoor units*
more than 7 °C?
* The
difference in temperature between indoor units
means the following:
b3 (discharge air temperature) - b2 (air inlet
temperature)
indicated on the remote control by the
check mode.
— —
7 Test run
142
SMGB0065 rev. 1 - 12/2010
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