Daikin EWWQ-AJYNN, Руководство по обслуживанию

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Functional Control ESIE07-05
2–78 Part 2 – Functional Description
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2.22 Oil Management Safeties
2.22.1 Pressure ratio alarm
Introduction Because the capacity control is done by oil pressure it is very important to have a minimum pressure
difference between LP and HP to be able to move the sliding vane.
Function
description When the pressure ratio is too small for a specified time, the controller will give an alarm.
■ When the unit is at 25% capacity, the unit will go into alarm when the pressure ratio is below 1.4
for a specified time.
■ When the unit is at 100% capacity, the unit will go into alarm when the pressure ratio is below 1.8
for a specified time.
■ When the unit is between 25% and 100% capacity the unit will go into alarm when the pressure
ratio is below the calculated value for a specified time.
pressure ratio =
discharge pressure (Abs)
____________________
suction pressure (Abs)
1.4
Pressure ratio
1.8
25 % cap. 100 % cap.
Pressure Ratio Alarm
Min Load Setp
Max Load Setp
1.4
1.8
ESIE07-05.book Page 78 Friday, December 21, 2007 3:21 PM