Guide For Operation Condition; Checkpoints; Cool Mode; Heat Mode - Mitsubishi Electric SUZ-KA24NAHZ Service Manual

11-2. Guide for operation condition

Enter the temperature differences between
Operation state is determined according to the plotted areas on the graph.
For data measurements, set the fan speed to "Hi" before activating maintenance mode.
Inspection item
Breaker
Terminal block Outdoor Unit
Indoor Unit
(Insulation resistance)
(Voltage)
1 Accumulated operating time
Com-
2 Number of ON/OFF times
pressor
3 Current
4 Refrigerant/heat exchanger temperature COOL
5 Refrigerant/discharge temperature COOL
6 Air/outside air temperature
(Air/discharge temperature)
Appearance
Heat exchanger
Sound/vibration
Air/intake air temperature
7
(Air/discharge temperature)
Refrigerant/heat exchanger temperature COOL
8
Filter operating time*
9
Decorative panel
Filter
Fan
Heat exchanger
Sound/vibration
* The filter operating time is the time that has elapsed since the filter was reset.

Cool mode

:
45
40
35
30
25
20
15
10
[
5
heat exchanger temperature)
OCH754A

Checkpoints

, , and
5 4 7
Result
Good Retightened
Good Retightened
Good Retightened
: HEAT
: HEAT
COOL : HEAT
COOL : HEAT
Good Cleaning required
Good Cleaning required
None Present
COOL : HEAT
COOL : HEAT
: HEAT
Good Cleaning required
Good Cleaning required
Good Cleaning required
Good Cleaning required
None Present
Inspection C
Filter inspection
Normal
Inspection B
Inspection A
5
:
0 10 20 30 40 50 60 70 80
Discharge temperature] – [ Outdoor
4
Area
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.
Note:
The above judgement is just guide based on Japanese standard
conditions. It may be changed depending on the indoor and outdoor
temperature.
*1 It may be judged as "Filter inspection" due to the outdoor and
indoor temperature, even though it is not clogged.
into the graph given below.
8
Classification
Inspection Is "D000" displayed stably on the remote
controller?
Temperature ( Discharge temperature) – (
5
M" difference heat exchanger temperature)
V
( Indoor intake air temperature) – (
7
Time
Indoor heat exchanger temperature)
Times
Inspection Is "D000" displayed stably on the remote
A
controller?
Temperature ( Discharge temperature) – (
:
5
difference heat exchanger temperature)
:
( Indoor heat exchanger temperature) –
: 8
( Indoor intake air temperature)
: 7
Notes:
1. Fixed Hz operation may not be possible under the following tempera-
ture ranges.
A)In cool mode, outdoor intake air temperature is 40 : or higher or
:
indoor intake air temperature is 23 : or lower.
:
B)In heat mode, outdoor intake air temperature is 20 : or higher or
:
indoor intake air temperature is 25 : or lower.
Time
If the air conditioner is operated at a temperature range other than the
2.
ones above but operation is not stabilized after 30 minutes or more have
elapsed, carry out inspection.
3.
In heat mode, the operation state may vary due to frost forming on the
outdoor heat exchanger.

Heat mode

Result
Judgement
Check item
Cool
75
Item
Outdoor
4
8
Indoor
8
:
45
Inspection C
40
Filter inspection
35
30
25
Normal
20
15
Inspection B
10
Inspection A
5
0 10 20 30 40 50 60 70 80 :
[ Discharge temperature] – [ Indoor
5 8
heat exchanger temperature)
Heat
Result
Stable Unstable
:
:
Stable Unstable
:
: