Mitsubishi Electric MXZ-18TV Service Manual page 16

COOL 150
HEAT 120
Capacity code
Indoor unit
<Correction>
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)
• (Main pipe temperature thermistor - sub pipe temperature thermistor)
3 Discharge temperature
w 1 Perform this, when number of operation units is 2units or more
w 2 When the correction opening of suction super heat is 0, correct the LEV opening by dischaege temperature.
(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
Suction superheat (S.H.) LEV opening
more than 12
10 to12
8 to 10
6 to 8
6 or less
(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) = (Gas pipe temperature thermistor) - (Evaporation temperature thermistor)
2 Select a minimum super heat from among them.
3 Correct an each LEV is corrected opening is corrected by difference between each super heat and minimum super
heat.
Difference of
superheat
more than 9
6 to9
3to 6
6 or less
Standard opening
1 2 3 4
160 170 180
130 140 150
1 2 3 4
07 09 12 18
correction (pulse)
6
4
3
2
0
LEV opening
correction (pulse)
8
6
2
0
5 6 7 8
190 190 200 200
160 170 180 180
16
Difference in Difference in
capacity operation number
Code2 Code3
25 50
20 40
COOL DRY
• •
• •
w 2 w 2
2
-60
-60
HEAT
-
•