Hitachi RHUE-3AVHN, Руководство по обслуживанию

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System MMI Pack (Room unit and RF receiver)
SMGB0066 rev.0 - 12/2009
Controller pack
Service Manual
4
4.22.4.3. 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 the the next tables.

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, 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.
4.22.4.4. Using the special features of the room Unit
Special feature description: Enable/disable
Heating
operation
(This feature is not available with the system)
This product can be used for heating applications.
You can independently modify the 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.