Operational Frequency Range; Heat Defrosting Control; Lev Opening Correction By Discharge Temperature; Conditions To Finish Defrosting Mode - Mitsubishi Electric MSC-A07WV Service Manual

(3) LEV opening correction by discharge temperature

When LEV correction output is 0 pulse by the suction super heat at COOL or DRY operation, or HEAT operating, correct
LEV is corrected according to the following table.
The target discharge temperature is determined according to frequency zone and number of operation unit of the
compressor.
Operation frequency
of compressor
Minimum ~ 20
21 ~ 33
34 ~ 46
47 ~ 59
60 ~ 72
73 ~ 85
86 ~ 98
97 ~ 111
111 ~ Maximum
Correct the LEV opening according to the difference between target discharge temperature and discharge temperature.
More than Target discharge temperature+11
Target discharge temperature+11 to Target discharge temperature+8
Target discharge temperature+8 to Target discharge temperature+5
Target discharge temperature+5 to Target discharge temperature+2
Target discharge temperature+2 to Target discharge temperature-2
Target discharge temperature-2
Target discharge temperature-5
Target discharge temperature-8
Target discharge temperature-11 or less

11-14.Operational frequency range

Number of
capacity
operating
code
Min.
unit
1
1 2 25
3
2
3
4
40
2 5
6
7

11-15.Heat defrosting control

(1) Conditions to enter defrosting mode
1. When temperature of defrosting thermistor is -3; or less.
2.When specified non-defrosting time, is counted in the control p.c.board is satisfied.
(Total time of compressor operating)
Going to defrosting mode at both condition of 1 and 2.
(2) Defrosting operation
1. Compressor stops for 50 seconds, Indoor fan is off, Defrosting lamp lights.
2.4-way valve reverses flow, Compressor operates by the frequency in heat defrosting control.
3. After compressor stops for 35 seconds, 4-way valve reverses flow, then defrosting finishes.

(3) Conditions to finish defrosting mode

1. When the defrosting thermistor temperature is 13.2; or more.
2. When it has spent 10 minutes for defrosting.
Defrosting finishes at condition of 1 or 2.
COOL, DRY
Number of operating unit
Single
40
40
45
52
62
67
72
75
80
Discharge temperature (;)
to Target discharge temperature-5
to Target discharge temperature-8
to Target discharge temperature-11
COOL (Hz) DRY
(Hz)
Max. Rated Min.
76 55 27
90 61 41 25
100 85 53
120 110 72 43
LEV opening correction (pulse)
Number of operating unit
Double Single
40 45
40 50
45 55
52 60
62 65
67 70
72 70
75 75
80 76
HEAT (Hz)
Max. Defrost Rated
100 120 72
100 120 76
122 120 88
122 120 120
Note: When the fan speed of indoor unit is
totally Low notch, the maximum frequency
is rated frequency.
100
HEAT
Double
45
50
55
60
65
70
70
75
76
LEV opening
correction (pulse)
COOL HEAT
10 8
4 2
2 1
1 1
0 0
-1 -1
-2 -1
-5 -2
-8 -6