Cooling Circuit 1 Functions - Fujitsu Waterstage WS G140DC6 Series Maintenance Document

Split system (Single phase and 3-phase type)

4.3.5 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 (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
temperature and compares
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 no. 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.
Comfort cooling setpoint
Line no. 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.
Release:
Line no. Programming line
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).
62
the current room
it with the room
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 sub-cooling" 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 floors, or any emitters not intended for this
purpose.

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.
In summer the comfort setpoint is gradually increased
in relation to the outdoor temperature (see lines 918-
920).

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.
Maintenance Document 1544-1