Daikin EWYD-BZ - Page 17

Operating Manual
D-EOMCP00104-14_01EN
EWYD_BZ
17/35
Table 2 - Compressors startup and loading management (4 compressors unit)
Step n.
Leader Comp.
Lag 1 Comp.
Lag 2 Comp.
Lag 3 Comp.
0
Off
Off
Off
Off
1
If (T – SetP) < Startup DT & Cooling
or (SetP - T) < Startup DT & Heating
… Waiting …
2
Start
Off
Off
Off
3
Load up to 75%
Off
Off
Off
4
If T in Regulation Band
… Wait interstage time …
5
If T is approaching SetP
… Waiting …
6a
SetP-RDT<T< SetP-RDT
Unload up to 50%
Start
Off
Off
6b
SetP-RDT<T or T> SetP-RDT
Fixed at 75%
Start
Off
Off
7
Fixed at
75% or 50%
Load up to 50%
Off
Off
8
(if leader at 50%)
Load up to 75%
Fixed at 50%
Off
Off
9
Fixed at 75%
Load up to 75%
Off
Off
10
If T in Regulation Band
… Wait interstage time …
11
If T is approaching SetP
… Waiting …
12a
SetP-RDT<T< SetP-RDT
Fixed at 75%
Unload up to 50%
Start
Off
12b
SetP-RDT<T or T> SetP-RDT
Fixed at 75%
Fixed at 75%
Start
Off
13
Fixed at 75%
Fixed at 75% or 50%
Load up to 50%
Off
14
(if lag1 at 50%)
Fixed at 75%
Load up to 75%
Fixed at 50%
Off
15
Fixed at 75%
Fixed at 75%
Load up to 75%
Off
16
If T in Regulation Band
… Wait interstage time …
17
If T is approaching SetP
… Waiting …
18a
SetP-RDT<T< SetP-RDT
Fixed at 75%
Fixed at 75%
Unload up to 50%
Start
18b
SetP-RDT<T or T> SetP-RDT
Fixed at 75%
Fixed at 75%
Fixed at 75%
Start
17
Fixed at 75%
Fixed at 75%
Fixed at 75% or
50%
Load up to 50%
18
(if lag2 at 50%)
Fixed at 75%
Fixed at 75%
Load up to 75%
Fixed at 50%
19
Fixed at 75%
Fixed at 75%
Fixed at 75%
Load up to 75%
20
Load up to 100%
Fixed at 75%
Fixed at 75%
Fixed at 75%
21
Fixed at 100%
Load up to 100%
Fixed at 75%
Fixed at 75%
22
Fixed at 100%
Fixed at 100%
Load up to 100%
Fixed at 75%
23
Fixed at 100%
Fixed at 100%
Fixed at 100%
Load up to 100%
24
Fixed at 100%
Fixed at 100%
Fixed at 100%
Fixed at 100%