Cooling Circuit 1 Function - Fujitsu WATERSTAGE WOYG160LJL Maintenance Document

▼ Cooling Circuit 1 Function

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 (command line 901 = Auto) and is triggered by
the programming clock (Command 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 fl ow 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 963 which will connect the pump directly
to zone 2. This will require setting the "Mixing valve
subcooling parameter (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
fl oors, or any emitters not intended for this purpose.
Operating Mode
Line Nr Programming line
901 Operating mode (Off / Automatic)
The cooling key on the user interface enables switching
between operating modes.
• Off
The cooling function is deactivated.
• Automatic
The cooling function is automatically activated by the
time program (command line 907), the holiday program,
the occupancy key, or according to the need.
Comfort cooling setpoint
Line Nr Programming line
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.
In summer the comfort setpoint is gradually increased in
relation to the outdoor temperature (see lines 918-920).
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Release
Line Nr Programming line
Release (24h/day / heating circuit time pgm
907
/ Time program 5)
The "Release" setting determines the time program
according to which cooling is released.
• 24h/day
Cooling is continuously activated (24h/day).
• Heating circuit time program
Cooling is activated according to the heating circuit time
program.
• Time program 5
Cooling is released according to time program 5.
Cooling Characteristic
Line Nr Programming line
908 Flow temp setp at OT 25 °C
909 Flow temp setp at OT 35 °C
The controller computes the fl ow temperature required
for a given averaged outdoor temperature based on the
cooling characteristic. This is defi ned by two reference
points (fl ow setpoint at 25 °C and at 35 °C).
Flow temp setp at OT 25 °C
This is the cooling fl ow temperature required when the
averaged outdoor temperature is 25 °C, without summe
compensation.
Flow temp setp at OT 35 °C
This is the cooling fl ow temperature required when the
averaged outdoor temperature is 35 °C, without summer
compensation.
908
909
The cooling characteristic is adjusted for a 25 °C room
temperature setpoint. If the room temperature setpoint
is changed the curve will automatically adapt.
Waterstage / Maintenance Manual / 2105 - EN