eCO2Boost XS 3
10
8.3. Electrical connection (DANFOSS regulator & several unit coolers)
8.2. Electrical connection (Thermostat & 1 unit cooler)
Dry
Contact
P
N
Supply
thermostat
Contact
Fan
Contact
Defrost
Fan
Resistance
CDU
CLA / CLB
P
N
AKCC 1
AKVH 1
AKCC
Comp
AKCC
Defrost
KA1
RES 1
21
22
5
6
AKCC
AKVH
12
14
10
11
CDU
CLA or CLB
2
1
21
22
REMARKS :
The contact of auxiliary relay KA
…
(NO) must be wiring in parallel on the CDU ( contact CLA or CLB )
Mandatory to supply 1 of the AKVH during the ramp down of the CDU to avoid discharge pressure cut.
AKVH control R14 = 01 (On/Off)
KA1
(NC)
KA2
(NC)
KA1
(NO)
KA2
(NO)
FAN 1
AKCC
Fan
AKCC 2
KA2
AKCC
Comp
RES 2
FAN 2
AKVH 2
AKCC
Defrost
AKCC
Fan
AKCC
AKVH
UNIT COOLER 1
UNIT COOLER 2
11
10
14
12
5
6
15
15
16
16
1
2
8.1. External ON/OFF control signal
SYSTEM CONTROL LOGIC
1.
The compressor speed will change in order to achieve the low pressure set point decided by installer.
2.
The low pressure is function of the evaporating temperature required for the showcase
(Tev = Tair_sc –
∆
T).
3.
CDU EEV control the high pressure of each cycle (optimal value as function of ambient temperature).
DEFROST CONTROL LOGIC
1.
CDU compressors and fans should stop before the unit cooler defrost.
2.
Defrost (compressor stop) signal should be sent to CDU
before the EEV controller.
3.
Compressors will stop gradually before 3 minutes.