Guide For Operation Condition; Check Points - Mitsubishi Electric PUZ-A18NHA4 Service Manual

11-2.GUIDE FOR OPERATION CONDITION

Inspection item
Breaker
Terminal block Outdoor Unit
Indoor Unit
(Insulation resistance)
(Voltage)
Accumulated operating time
Com-
Number of ON/OFF times
pressor
Current
Refrigerant/heat exchanger temperature COOL
Refrigerant/discharge temperature COOL
Air/outside air temperature
(Air/discharge temperature)
Appearance
Heat exchanger
Sound/vibration
Air/intake air temperature
(Air/discharge temperature)
Refrigerant/heat exchanger temperature COOL
Filter operating time*
Decorative panel
Filter
Fan
Heat exchanger
Sound/vibration
* The filter operating time is the time that has elapsed since the filter was reset.
Area Check item
Normal Normal operation state
Filter inspection Filter may be clogged. *1
Inspection A Performance has dropped. Detailed in-
spection is necessary.
Inspection B Refrigerant amount is dropping.
Inspection C Filter or indoor heat exchanger may be
clogged.
*
The above judgement is just guide based on Japanese standard
conditions.
*1
It may be changed depending on the indoor and outdoor temperature.
It may be judged as "filter inspection" due to the outdoor and indoor
temperature, even though it is not clogged.
Result
Good Retightened
Good Retightened
Good Retightened
M
V
Time
Times
A
°F HEAT °F
°F HEAT °F
COOL °F HEAT °F
COOL °F HEAT °F
Good Cleaning required
Good Cleaning required
None Present
COOL °F HEAT °F
COOL °F HEAT °F
°F HEAT °F
Time
Good Cleaning required
Good Cleaning required
Good Cleaning required
Good Cleaning required
None Present
Judgment
Cool Heat
87

Check Points

Enter the temperature differences between
the graph given below.
Operation state is determined according to the plotted areas on
the graph.
For data measurements, set the fan speed to "Hi" before activat-
ing maintenance mode.
Classification
Inspection Is "000" displayed stably in Display
on the remote controller?
Temperature ( Discharge temperature) – (
difference heat exchanger temperature)
( Indoor intake air temperature) – (
Indoor heat exchanger temperature)
Inspection
Is "000" displayed stably in Display
on the remote controller?
Temperature ( Discharge temperature) – (
difference heat exchanger temperature)
( Indoor heat exchanger temperature) –
( Indoor intake air temperature)
* Fixed Hz operation may not be possible under the following tempera-
ture ranges.
A)In cool mode, outdoor intake air temperature is 104 °For higher or
indoor intake air temperature is 73 °F or lower.
B)In heat mode, outdoor intake air temperature is 68 °F or higher or
indoor intake air temperature is 77 °F or lower.
* If the air conditioner is operated at a temperature range other than the
ones above but operation is not stabilized after 30 minutes or more have
elapsed, carry out inspection.
* In heat mode, the operation state may vary due to frost forming on the
outdoor heat exchanger.
Cool mode
°F
81
72
Inspection C
63
54
45
Filter inspection
36
Normal
27
Inspection B
18
Inspection A
9
0 18 36 54 72 90 108 126 144
[ Discharge temperature] – [
heat exchanger temperature)
, , and
Item Result
Stable Unstable
Outdoor
Stable Unstable
Indoor
Heat mode
ºF
81
Inspection C
72
Filter inspection
63
54
45
Normal
36
27
Inspection B
18
Inspection A
9
°F
18 36 54 72 90 108 126 144
Outdoor [ Discharge temperature] – [
heat exchanger temperature)
into
°F
°F
°F
°F
°F
Indoor