SyxthSense Ltd
Copyright © 2020 SyxthSense Ltd. All rights reserved - 11/2020
PS
CT2.161
- 9/34
Online store:
www.syxthsense.com
Enquiries: T:
+44 (0)1392 875 414
E:
High/Low Limit Control
(Reset Control)
If an external NTC10 sensor is fitted (to RI1 or RI2) and
the corresponding high/low limit input has been enabled,
the controller can carry out high limit and/or low limit
control. In high limit control, if the external temperature
exceeds the High Limit setpoint, the main control setpoint
is reduced by the amount set in the Limit Ratio per
degree. E.g. if the Limit Ratio is 2, every degree that the
external temperature exceeds the High Limit setpoint, the
target (setpoint) is reset by 2 degrees.
HIGH/LOW
LIMIT ICON
INDICATES
THAT LIMIT IS
BEING
APPLIED
Room
20
.1
°C
Target
21
.5
°C
A
Note: RI2 is not available with SRC-701.
The Low Limit control works in reverse. If the external
temperature drops below the Low Limit setpoint, the main
control setpoint is increased by the amount of the ratio for
every degree below the Low Limit setpoint.
The setpoint reset amount follows the formula:-
Setpoint_Reset = (Limit_Setpoint - Temperature ) * Limit_Ratio
NOTE: The target setpoint on the display is not changed during the limitation. The limit icon
indicates active limitation. To see the effective limited setpoint enter Controller Status and
Information display.
Note: The limit function is enabled by setting the Limit Ratio parameter (as default 0.0 =
disabled).
Note: In OFF mode high/low limit function is disabled.
Mode Button and Screen
By touching the MODE BUTTON on the HOME
SCREEN, the device enters to the MODE
SCREEN. From the MODE SCREEN the
operating mode of the controller can be
selected.
BOOST MODE
(STATUS &
BUTTON)
RETURN TO HOME
SCREEN
MODE SCREEN
BOOST MODE
BUTTON
COMFORT MODE
BUTTON
ECO MODE
BUTTON
OFF MODE
BUTTON
Room
20
.1
°C
Target
21
.5
°C
Wed 12:43
HOME SCREEN
MODE BUTTON AND
MODE INDICATION
BOOST MODE
COMFORT MODE
ECO MODE
OFF MODE
The possible selections for the MODE screen
are:-
•
BOOST MODE
•
COMFORT MODE
•
ECO MODE
•
OFF MODE
After selecting the Mode the device
automatically returns to the HOME SCREEN. If
no buttons are pressed the device returns
automatically after a timeout. Alternatively the
return button can be pressed to return.
The Mode button has the following
configuration options:-
•
Mode Indication Only
•
Active Access to Mode Screen (default)
MODE SCREEN is protected by STAFF
ACCESS code. As default the STAFF CODE is
set as ’0000’ and no password is required to
enter MODE screen (from Fw4.13 onwards).
