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No.
Item
6
Defrosting in
heating
7
High and low
pressure protection
36
Compressor operational frequency range
HEATING
MXZ-18NV-
E1
Number of
Indoor unit
operating unit
capacity class
1
2
09+09
MXZ-18NV-
E2
Number of
Indoor unit
operating unit
capacity class
07 or 09
1
09+09
2
07+12
MXZ-32NV-
E1 E2
Number of
Total capacity
operating unit
1
2
3
4
<Conditions to start defrosting>
The system starts defrosting when it satisfies both of the following conditions :
The defrost thermistor detects -3°C or below.
Defrost interval (I. e. the accumulated compressor operation time) counted by the controller
board has reached the prescribed value.
<Details of defrosting>
The compressor stops for 32.5 seconds and the indoor fan turns OFF.
The 4 - way value reverses and the compressor runs at the defrosting frequency.
After the defrosting termination conditions are satisfied, the compressor stops for 32.5
seconds and the 4 - way valve reverses. This is the end of defrosting.
<Conditions to terminate defrosting>
The system terminates defrosting when it satisfies, either of the following conditions :
The defrost thermistor detects +10°C or above.
Defrosting time has reached 10 minutes.
(1) High pressure protection in heating
• The operational frequency, 2 - way valve (only MXZ-32NV), and outdoor fan motor are
controlled according to the indoor coil temperature.
When it rises to nearly 50°C, the operational frequency will be fixed to the value at the moment
and the outdoor fan speed will change to low.
When it rises to nearly 53°C, the operational frequency will be reduced by 4 Hz from the
current value and the 2 - way valve will open.
(2) High pressure protection by high pressure switch (H.P.S : MXZ-18NV , 63H1 : MXZ-32NV)
• The operational frequency, 2 - way valve (only MXZ-32NV), and outdoor fan motor are
controlled by the high pressure switch to protect excessive high pressure.
<Condition to active the protection>
The high pressure protection starts when the high pressure switch turns ON, that is the discharge
pipe pressure rises to 2.75
Details
Minimum
Maximum
09
34
70
34
86
Minimum
Maximum
34
70
12
34
86
Minimum
Maximum
code
1
58
2
30
3
73
4
2
95
3
4
5
40
6
115
7
8
-
48
120
-
48
120
+ 0.05
MPa (28
+ 0.5
- 0.1
- 1.0
DEFROST
Rating
mode
70
43
86
82
DEFROST
Rating
mode
62
70
66
82
86
84
DEFROST
Rating
mode
45
65
58
105
75
107
112
105
2
kg/cm
) or above.
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