Lp Prevention - Daikin EWWQ-AJYNN Service Manual

Functional Control
2.17

LP Prevention

1
Introduction
2
Function
description
3
4
5
2–70
This is a safety prevention function, when the low pressure is near to the low pressure switch. The unit
will hold same capacity or will load down to prevent the unit from tripping on the low pressure switch.
LP (bar)
HP Hold Evap.
1.9 b
P Down Evap.
1.80 b
LP Switch
0.6 b
■
hold capacity area: if the LP is below the "P hold evap" setpoint (default 1.9 bar) the compressor
will hold same capacity (no load up possible)
■
load down area: if the LP is below the "P down evap" setpoint (default 4.8 bar) the compressor will
load down in order to increase the low pressure
■
below LP switch: the unit will shutdown safely
ESIE07-05
hold capacity area
load down area
unit switched off by LP switch
Time
Part 2 – Functional Description