Service manual

99
(1) LEV opening correction by suction super heat (COOL, DRY)
(Suction super heat) = (Minimum gas pipe temperature) - (Evaporation temperature)
When COOL and DRY, correct the LEV openings corrected from the table below.
(2) Separate correction (COOL,DRY)
(When number of operation unit is 2 units)
(a) Correction by the separate super heat
Correct the LEV separately by temperature difference between each gas pipe temperature thermistor and evaporator
temperature thermistor.
1 Calculate each super heat of the unit from the expression below;
(Super heat) = (Each gas pipe temperature) - (Minimum gas pipe temperature)
2 Separate correction is performed according to each super heat in the table below.
Suction superheat (S.H.)
LEV opening
correction (pulse)
more than 12
10 to12
8 to 10
6 to 8
6 or less
7
5
4
3
0
Superheat
LEV opening
correction (pulse)
more than 9
6 to9
3to 6
6 or less
10
8
4
0
1 Suction super heat
(MIN gas pipe temperature thermistor - Evaporation temperature thermistor)
2 Each correction w 1
• (Each gas pipe temperature thermistor - Evaporation temperature thermistor)
w 1 Perform this, when number of operation units is 2 units or more.
w 2 When the correction opening of suction super heat is 0, correct the LEV opening by discharge temperature.
3 Discharge temperature
COOL DRY HEAT
••
-
•
w 2
•
w 2
•
<Correction>
2 Code3Code2
Standard opening (pulse)
Difference in
capacity
Difference in
operation number
12345678
COOL
HEAT
200
160
210
170
220
180
230
190
Capacity code
Indoor unit
1
07
2
09
3
12
4
18
240
200
240
210
250
210
250
220
25
20
50
40
-60
-70
OB307A4.qxp 03.2.19 4:10 PM Page 99