Daikin EWYD-BZ - 3 CONTROL SYSTEM DESCRIPTION; 3.1 Architecture

D-EOMCP00104-14_01EN
Operating Manual
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EWYD_BZ
3 CONTROL SYSTEM DESCRIPTION
3.1 Architecture
The overall control system architecture is described in the following picture:
Board
Model
Function
Mandatory
pCO Controller #1
pCO5+ “Large”
Built In display (*)
Unit control
Compressors #1 & #2 control
Y
pCO Controller #2
pCO5 “Small”
Compressors #3
Yes on 3
compressors units
pCO
e
EXP #1
pCOe
Additional hardware for compressors #1 & 2 or
for compressors #3
N
pCO
e
EXP #2
pCOe
Heat recovery or Heat pump control
N
pCO
e
EXP #3
pCOe
Water pump control
N
pCO
e
EXP #4
pCOe
Additional fan steps for compressors #1 & #2 or
for compressors #3
N
EEXV driver #1
EVD Evolution
Electronic expansion valve control for
compressor #1
Y
EEXV driver #2
EVD Evolution
Electronic expansion valve control for
compressor #2
Y
EEXV driver #3
EVD Evolution
Electronic expansion valve control for
compressor #3
Yes on 3
compressors units
Additional display
PGD
Special characters or additional display
N
(*) The contemporaneous presence of built-in display and additional PGD may be accepted.
CAUTION: Maintain the correct polarity when connecting the power supply to the boards, otherwise
the peripheral bus communication will not operate and the boards may be damaged.