8
3.3 Using the Room Unit for Specific Applications
The
Room Unit
is a versatile controller that can be used to control many different applications. Please note
that when the
Room Unit
is installed in conjunction with a
System Controller
, the functionality will differ to
that when installed with a standard boiler system. Most of the functions shown below will be controlled by
the
System Controller
and be set within its parameters. Therefore, some of the system parameters within
the
Room Unit
menu will not apply. Please also note other changes to the setting of the optimisation and
proportional band settings as shown in tables
3.5.1
and
3.5.2
.
NOTE:
In order for the
Room Unit
to send the heating demand signal to the
RF Receiver
, it is essential that
the Category 2 parameter 8:Su is set to the correct value (see Installer Parameters Table,
3.5.2 Category
2 – System Settings
). Failure to do this will mean that the heating system will not respond to changes in
the setpoint on the
Room Unit
. Under these circumstances the system will operate with no input from the
Room Unit
and may not therefore provide adequate temperature control.
3.4 Using the Special Features of the Room Unit
Special Feature:
Description:
Enable/Disable
Heating or Cooling
Operation
This product can be used for heating or cooling
applications. If you select cooling mode the control
algorithm and factory default program will be modified. You
can independently modify the heating and cooling profile.
To enable: Set parameter 4:HC
(category 2) to 1.
Summer/Winter
Auto time change
This feature moves time automatically on the last Sunday
of March and the last Sunday of October. The feature is
factory enabled.
To enable: Set parameter 3:tC
(category 1) to 1.
Temperature Offset
If the
Room Unit
is located in a particularly hot/cold
location for reliable signal transmission reasons then the
measured/displayed temperature can be adjusted by +/-
3°C. This is useful if the homeowner wants the reading to
match another appliance temperature display.
Set parameter 12:tO (category
1) to the required offset value.
Upper/Lower
Temperature Limit
The normal upper temperature limit of 35°C can be
reduced to 21°C to save the homeowner energy. The
normal lower limit of 5°C can be increased up to 21°C to
protect inhabitants from cold.
Set parameter 6:uL (category 1)
to the desired upper limit.
Set parameter 7:LL (category 1)
to the desired lower limit.
Installation and Operation Manual
Summary of Contents for ATW-RTU-02
Page 112: ...PMML0213 rev 0 11 2010 ...
