Daikin FTKS50BVMB, Service Manual

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Protection Control SiEN18-622
108 Function
4.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
[In cooling operation]
[In heating operation]
Pe<0.25MP a
3 6Hz Unlo a d
Pe>0. 3 9MP a
Pe<0.07MP a
Low pre ssu re not limited
Low pre ssu re
s t a nd b y
Pe<0.15MP a Pe>0. 3 0MP a
Hot g as S VP = OFF
Hot g as S VP = ON
Pe: LP pre ssu re s en s or detection
v a l u e
Low pre ssu re
limited
When occ u rring 3 time s within 3 0 min., the
m a lf u nction code "E4" i s o u tp u t.
&
• T s -Teg< 8 deg
• Pe>0.06MP a
• Pe>0.09MP a
or
After 10 s ec. Pe<0.17MP a
Pe<0.17MP a
Pe>0.20MP a
Pe< 0.07MP a
C u rrent s tep limited
After 15 s ec.
Low pre ssu re not limited
Low pre ssu re limited
INV u pper limit fre qu ency :
1- s tep u p from c u rrent
compre ss or fre qu ency
Pe: LP pre ssu re s en s or detection
v a l u e
INV u pper limit fre qu ency :
3 - s tep down from c u rrent
compre ss or fre qu ency
When occ u rring 3 time s within 3 0 min.,
the m a lf u nction code "E4" i s o u tp u t.
Pe<0.12MP a Pe>0.17MP a
Hot g as S VP = OFF
Hot g as S VP = ON
Low pre ssu re
s t a nd b y