Cooling Circuit 1 Functions - Fujitsu Super High Power Series Design & Technical Manual

3-5. Cooling circuit 1 functions

Line Access
901 U Operating mode
902 U Comfort cooling setpoint
903 U Reduced setpoint
Flow temperature setpoint
908 I
at OT 25°C
Flow temperature setpoint
909 I
at OT 35°C
912 I Cooling limitation at OT
913 S Lock time at end of heating/cooling
918 S Summer compensation start at OT
919 S Summer compensation end at OT
Summer compensation setpoint
920 S
increase
Flow temperature setpoint minimum
923 S
OT 25°C
Flow temperature setpoint minimum
924 S
OT 35°C
928 S Room influence
932 S Room temperature limitation
938 S Mixing valve decrease
941 S Actuator running time
S With primary controller/system pump No, Yes
963
*: Basic setting: 1 circuit = No; 2 circuit = Yes
The cooling sequence is automatically started when the room temperature is higher than the comfort
setpoint in cooling mode (line 902). The cooling function must be activated (line 901 = Auto) and is
triggered by programming clock (line 907). The cooling sequence is interrupted as soon as heating
circuit 1 indicates a need for heat or in the presence of a heat demand signal from a DHW circuit or
other heating circuit (only if cooling is active).
The controller measures the current room temperature and compares it with the room temperature
setpoint to compute the flow temperature setpoint. If the temperature is not low enough the heat
pump is started to provide cooling (reversed control of the mixing valve).
The following settings apply to the hydraulic circuit in zone 1 (HC1). If there is a second zone, this
zone can be cooled with the setting (line 963) which will connect the pump directly to zone 2. This
will require setting the "Mixing valve sub-cooling" parameter (line 938) to a suitable value in order for
both zones to be adequately cooled according to the available emitters.
WARNING
Cooling mode is prohibited on all radiators, heating only floors, or any emitters not intended for this
purpose.
3-5. Cooling circuit 1 functions
Function
Protection, Automatic, Reduced,
Comfort
17...40°C
5...40°C
6...35°C
6...35°C
8...35°C
8...100 h
20...50°C
20...50°C
1...10°C
6...35°C
6...35°C
1...100%
0.5...4°C
0...20°C
30...873 s
- (03-22) -
Setting range or display
Factory
setting
Protection
24°C
26°C
20°C
16°C
24°C
24 h
26°C
40°C
4°C
18°C
18°C
80%
0.5°C
0°C
240 s
No*
3. Function table