1 Suction superheat
(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 superheat is 0, correct the LEV opening by discharge temperature.
(1) LEV opening correction by suction superheat (COOL, DRY)
(Suction superheat) = (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
8 to 10
6 to 8
6 or less
(2) Separate correction (COOL,DRY)
(When number of operation unit is 2 units or more)
(a) Correction by the separate superheat
Correct the LEV separately by temperature difference between each gas pipe temperature thermistor and evaporator
1 Calculate each superheat of the unit from the expression below;
(Superheat) = (Gas pipe temperature thermistor) - (Evaporation temperature thermistor)
2 Select a minimum superheat from among them.
3 Each LEV opening is corrected by difference between each superheat and minimum superheat.