8.1.1 Max time for DHW request
In case of a simultaneous demand, a parameter with which the priority between DHW and System is specified is
available.
The switching from DHW to the System after the first startup will be based on reaching of DHW set point or by
Par3121 (60min), and the switching from the System to the DHW will be based on Par3122 (15min).
Parameters
Level
Parameter
Function description
Display & Input value
Remarks
Group Code
Default
min.
Max.
Unit
I
31
01
D HW production priority setting
0=DHW is unavailable
1= DHW is available, and priority DHW over space Heating
2= DHW is available, and priority space Heating over DHW
0
0
2
-
I
31
21
Max. time for DHW request
60
0
900
1min
I
31
22
Min. time for space Heating/Cooling
15
0
900
1min
8.1.2 DHW 3way valve change over time
The DHW 3way valve will change over according to the function described in the following graph (from system to
DHW and vice-versa).
* Minimum compressor OFF-ON time (3min) is a fixed value. The interval time is necessary for refrigerant cycle
safety, it cannot be changed.
Note: If the Defrost cycle is required during DHW production, the 3way valve will change over to the system, to
avoid Cooling the DHW tank due to the cycle being reversed.
Parameters
Level
Parameter
Function description
Display & Input value
Remarks
Group Code
Default
min.
Max.
Unit
I
41
22
Delay time pump OFF from compressor OFF
30
0
900
1sec
I
41
23
Delay time compressor ON from pump ON
30
0
900
1sec
I
45
11
3way valve change over time
60
1
900
1sec
time
DHW 3way valve
for DHW
for Heating/Cooling
Pump ON
OFF
Compressor ON
OFF
(30sec)
(30sec)
(60sec)
3way valve changeover time
Delay time pump OFF
Delay time compressor ON
Max. time for DHW request
(3min*)
Minimum compressor OFF-ON time
98
8. Domestic Hot Water Production
Summary of Contents for AEYC-0639U-CH
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