Fujitsu WGYA050DG6 Design & Technical Manual page 153

Mixing Valve Control
LINE FUNCTION
938 Mixing valve decrease
941 Actuator running time
945 Mixing valve in heating mode
Mixing valve decrease
The cooling demand issued by cooling circuit 1 to
production is reduced by the adjusted value.
If there is a second zone, this reduction should
enable the second zone to be cooled. To achieve
Example:
Configuration
Zone 1: Heating/ 938 = 10°C,
with 924 = 18°C
cooling
floor 963 = yes
Zone 2: Fan coils
Zone 1: Heating/ 938 = 0°C,
with 924 = 18°C
cooling
floor 963 = yes
Zone 2: HCF
Warning:
If these settings are not chosen properly the heat
pump may stop automatically due to the flow
temperature being too low. A safety mechanism is
triggered at 6°C to protect the exchanger from
freezing.
Actuator running time
For the 3-position servomotor used, it is possible to
adjust the travel time. With a 2-position servomotor,
the adjusted travel time is inoperative.
Mixing valve heating mode
Determines the position of mixing valve 1 during
heating operation is activated.
This parameter is inoperative in installations where
heating and cooling circuits are hydraulically separate.
With primary controller/system pump
LINE FUNCTION
With primary controller/system pump
963
(No / Yes)
This setting specifies whether the cooling circuit is
supplied from the primary controller or from the
primary pump (depending on the installation). It can
also be used to provide cooling to the second zone.
this result, the sub-cooling must be determined in
accordance with the type of emitter and "With
primary controller/system pump" (line 963) must be
set to "yes" to switch on the pump for the second
zone.
How the configuration affects control
with a 35°C outdoor temperature the flow
setpoint will be 18°C – 10°C i.e. 8°C
while in the first zone (HCF) it will be 18°C
through action of the mixing valve
with a 35°C outdoor temperature the flow
setpoint will be 18°C in both zones
•
Control
The valve controls in heating and cooling mode.
•
Open
The valve controls in cooling mode, and is open in
heating mode.
Warning:
In the case of a radiator or any other emitter which
does not support the cooling mode in zone 2, this
setting must remain on "No".
- (CS01 - 37) - - (CS01 - 37) -
Control system