SyxthSense Ltd
Copyright © 2020 SyxthSense Ltd. All rights reserved - 11/2020
PS
CT2.161
- 12/34
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www.syxthsense.com
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The Fan Off Delay defines time how long the fan overruns in the deadzone (after no demand). E.g. by
setting the Fan Off Delay to 30 seconds, the fan switches off after the Htg/Clg Stage 1 demand has
remained within the deadzone for 30 seconds (example above).
If maximum speed is required to be set for the fan, this is confugured by setting the maximum level in
the analogue output (Y1, Y2, Y3) scaling. As default fan speed is configured for Y1.
In ECO mode the Fan Speed control follows the same principle as in the COMFORT mode. In OFF
mode the fan is Off unless frost has been detected in which case the fan output is set to 33%.
Automatic Fan Speed Display
Fan speed can be displayed on the
screen using coloured bar indicating
the speed and rotating fan icon. The
display is enabled through the Fan
Speed Display parameter.
Room
20
.1
°C
FAN SPEED INDICATION AND
CONTROL, AUTO IS DISPLAYED
WHEN UNDER AUTOMATIC
CONTROL. WHEN RUNNING
Target
21
.5
°C
FAN SPEED INDICATION IN
AUTOMATIC CONTROL
0% to 8%
A
A
A
A
A
A
A
A
8% to 25%
25% to 41%
41% to 58%
58% to 74%
74% to 92%
92% to 100%
Options are:-
•
NONE; no display (Default)
•
NO INPUT; no user adjustment
•
0-1; Off/On
•
0-1-2; 2-Speed
•
0-1-2-3; 3-Speed
•
0-1-2-3-4-5-6; 6-Speed
When in Automatic control ’A’ is
displayed above the coloured bar. The
number of bars displayed depends on
the fan speed - switching levels described above.
Manual Fan Speed Override
The Fan Speed Display parameter
is used to configure Manual Fan
Speed Override options; On/Off,
2-Speed, 3-Speed or 6-Speed.
ON/OFF MANUAL
FAN OVERRIDE
3-SPEED MANUAL
FAN OVERRIDE
2-SPEED MANUAL
FAN OVERRIDE
M
AFTER FULL SPEED AUTO
OPTION IS AVAILABLE TO
RETURN BACK TO AUTO-
MATIC CONTROL
6-SPEED MANUAL FAN
CONTROL
M
17%
33%
0%
50%
67%
83%
100%
A
Auto
SPEED SET BY
CONTROLLER
100%
0%
50%
100%
0%
33%
67%
0%
100%
M
M
M
M
M
M
M
M
M
M
M
M
A
Auto
SPEED SET BY
CONTROLLER
A
Auto
SPEED SET BY
CONTROLLER
A
Auto
SPEED SET BY
CONTROLLER
Once activated the user can
override the Fan Speed by
touching the Fan Icon on the
screen. The desired speed can be
set by touching multiple times on
the screen. When Manual override
is active ’M’ is displayed above the
coloured speed bar.
In ECO mode Manual Override is
active. In OFF mode manual
override is disabled.
NOTE: Manual Fan Override sets
the Fan Speed to defined values as described above and the Min. Fan Level parameter is
ignored.
Auxiliary Heating Control
Loop
The SRC-700 series controllers have an auxiliary heating temperature control loop. The auxiliary
control loop provides additional PI-control function for applications where second control loop is
required e.g. second zone temperature control for bathrooms. The auxiliary control loop is activated
by selecting Aux control for RI1 or RI2 input.
Note: RI2 is not available with SRC-701.
CO2 Sensor Control Loop
Operation (SRC-70x-CO2
Models)
The CO2 models can measure and control
the CO2 level. This can then be used in
demand based control applications. The
CO2 control output can then be configured
to linked to any of the physical control
outputs Y1, Y2 or Y3, or used in maximum
demand control (MAX VAV, MAX FAN
options)
CONTROL
OUTPUT
CO2 Control
SP= Setpoint e.g. 800ppm
PB = Proportional Band
100%
PB
e.g 400ppm
SP
0%
CO2 Level
-
+
0 ppm
2000 ppm
LOOP OUTPUT
The CO2 control loop output corresponds
to the CO2 setpoint and the CO2
proportional band. If configured as Direct
Control (typical), then if the CO2 level
increases above the setpoint the loop output starts to modulate to 100%. When the CO2 level is the
amount of the Proportional Band above the setpoint, the loop output is 100%. The configuration is
done via the configuration parameters. The CO2 control loop can also be configured to operate as
