Daikin EWAD650BJYNN/Q [248/346] Oil management safeties

Functional Control ESIE07-04

2–108 Part 2 – Functional Description

3.24 Oil Management Safeties

3.24.1 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.

P 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.

P 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.

P 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