CHOFU AEYC-1639U-CH Installation And Instruction Manual page 96

7. Unit Management
4) Zone1 (Pump1, Mixing valve), Zone2 (Pump2), Buffer tank, DHW tank
He ating/Cooling:
In the case of the Buffer tank temperature probe being enabled (Par5111=1), the HP unit operates with
maximum water temperature in Heating (60°C) or minimum water temperature in Cooling (7°C) in order for
S3 to reach the Buffer tank set point.
Regarding the Buffer tank set point of S3 in the case of Zone2 being ON. If Terminal 22-23 (Dual set point)
is OPEN (and Par5122=0), the higher set point shall be selected for Heating mode and the lower set point
shall be selected for Cooling mode by comparison between Buffer tank set point and Zone1 water set point.
If Terminal 22-23 is CLOSED, the higher set point shall be selected for Heating mode and the lower set point
shall be selected for Cooling mode by comparison between Buffer tank set point, Zone1 water set point, and
Zone2 water set point.
In order to guarantee correct operation, Buffer tank set point in Heating mode shall be higher than water set
points of Zone1 and Zone2. In Cooling mode, on the other hand, Buffer tank set point shall be lower than
water set points of Zone1 and Zone2.
Pump1 shall be turned ON/OFF by T1 of Zone1 and Room set point of the Master Remote controller, and
Pump2 shall be turned ON/OFF by T2 of Zone2 and Room set point of the Slave Remote controller.
Mixing valve is controlled in order for S4 to reach the water set point of Zone1 (Fixed or Climatic curve).
DH W:
The HP unit operates with maximum water temperature in Heating (60°C) in order for S2 to reach the DHW
set point.
S1
HP unit
Parameters
Parameter
Level
Group Code
T he HP unit turns ON/OFF based on
I 41 00 0=Room set point
1=Water set point
T erminal 11-12 : Buffer tank temperature probe
I 51 11 0=disable
1=enable
T erminal 22-23 : Dual set point control
I 51 22 0=disable
1=enable
96
DHW tank
S2
M
Buffer tank
Function description
Mixing
valve
S3
M
Display & Input value
Default min.
1 0
0 0
1 0
Zone1
S4
Pump1
Zone2
Pump2
Remarks
Max. Unit
To be set to
1 - the following
combinations
Par5111=0
→ Par4200=0 or2
1 -
Par5111=1
→ Par4200=0 or1 or2
1 -
T1
T2