Daikin EWWQ-AJYNN Service Manual page 56

Functional Control
1
Unit shutdown
2
3
Compressors start
up and loading
management
4
(4 compressors)
5
2–50
Unit S hutdown request
(see compressors shutdown in startup
and management procedure)
Flow switch opening within 180 s
Evaporator pump shutdown
Step n. Leader Comp.
0 Off
1 If (T – SetP) < Start up DT & Cooling
or (SetP – T) < Start up DT & Heating
Waiting
2 Start
3 Load up to 75%
4 If T in Regulation Band Wait interstage time
5 If T is approaching SetP – Waiting
6a (T in unload Unload up to 50%
band)
6b (T not in unload Fixed at 75%
band)
6 Fixed at 75% or
50%
7 (If leader at 50%) Load up to 75%
8 Fixed at 75%
9 If T in Regulation Band Wait interstage time
10 If T is approaching SetP – Waiting
10a (T inun load Fixed at 75%
band
10b (T not in Fixed at 75%
unload band)
11 Fixed at 75%
12 (If lag 1 at 50%) Fixed at 75%
13 Fixed at 75%
14 If T in Regulation Band Wait interstage time
15 If T is approaching SetP – Waiting
Compressors shutdown
(user set)
Lag 1 Comp.
Off
Off
Off
Start
Start
Load up to 50%
Fixed at 50%
Load up to 75%
Unload up to 50%
Fixed at 75%
Fixed at 75% or
50%
Load up to 75%
Fixed at 75%
ESIE07-05
UNIT ALARM 005
(Evap Flow Alarm)
Lag 2 Comp. Lag 3 Comp.
Off Off
Off Off
Off Off
Off Off
Off Off
Off Off
Off Off
Off Off
Start Off
Start Off
Load up to 50% Off
Fixed at 50% Off
Load up to 75% Off
Part 2 – Functional Description