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(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 or more)
(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.
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)
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.
3 Discharge temperature
COOL DRY HEAT
••
-
•
w 2
•
w 2
•
<Correction>
OB254-1.qxp 03.1.16 4:33 PM Page 21