Fujitsu WGYA050DG6 Design & Technical Manual page 148

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Cooling circuit 1 functions
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 the 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).
Operating Mode
LINE FUNCTION
Operating mode
901
(Off / Automatic)
The cooling key on the user interface enables
switching between operating modes.
•
Off
The cooling function is deactivated.
Comfort cooling setpoint
LINE FUNCTION
902 Comfort cooling setpoint
In cooling mode the room temperature control
follows the comfort setpoint adjusted under this
setting. The cooling comfort setpoint can be
displayed with a knob on the room unit.
Release
LINE FUNCTION
907 Release
(24h/day / Heating circuit time pgm / Time program 5)
The "Release" setting determines the time program
according to which cooling is released.
•
24h/day
Cooling is continuously activated (24h/Day).
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.
•
Automatic
The cooling function is automatically activated by
the time program (line 907), the holiday program,
the occupancy key, or according to the need.
In summer the comfort setpoint is gradually
increased in relation to the outdoor temperature
(see lines 918-920).
•
Time program HC
Cooling is activated according to the heating circuit
time program.
•
Time program 5
Cooling is released according to time program 5.
- (CS01 - 32) - - (CS01 - 32) -
Control system