CIAT EREBA T/HT User manual

User Manual
WALL-MOUNTED USER INTERFACE
EREBA T-HT / He
06 - 2017
10156

EREBA T-HT / He EN-2
1 - QUICK START ....................................................................................................................................................... 3
1.1 Important.............................................................................................................................................................3
1.2 Key features ........................................................................................................................................................3
2 - WUI DISPLAY OVERVIEW .................................................................................................................................... 4
3 - OVERVIEW OF ICONS.......................................................................................................................................... 5
4 - PROGRAMMING THE CONTROL......................................................................................................................... 6
4.1 Clock/Day: Setting the time and day.................................................................................................................... 6
4.2 Heating/Cooling/DHWonly/O:Changingtheoperatingmode ..................................................................... 7
4.3 Home / Sleep / Away: Changing the comfort range ............................................................................................. 8
4.4 Current setpoint control: Changing the temperature............................................................................................ 10
4.5 Additional data display: General status of the unit............................................................................................... 11
4.6 Scheduling: Assigning schedules to heating and cooling modes ........................................................................ 12
5 - ADVANCED PROGRAMMING OPTIONS ............................................................................................................. 15
5.1 Advanced settings: Programming the Control ..................................................................................................... 15
5.2 Domestic Hot Water mode ..................................................................................................................................15
5.3 Pool Heating mode..............................................................................................................................................15
5.4 Master / Slave control.......................................................................................................................................... 16
6 - ALARMS AND ERRORS ....................................................................................................................................... 17
6.1 Alarms................................................................................................................................................................. 17
6.2 Errors ..................................................................................................................................................................18
Contents

EN-3 EREBA T-HT / He
1 - QUICK START
1.1 Important
Your system is controlled by a Wall-Mounted User
interface (WUI) that can be installed inside your home.
This manual provides guidelines on how to use this
interface effectively.
If you have any questions regarding the display and
its configuration, please contact your installer for more
information.
1.2 Key features
●Heating / Cooling: Depending on the unit, the
system may operate in Heating or Cooling.
●Occupancy control allows you to easily set the
system to operate in the following modes:
Home
Sleep
Away
●Easy temperature control: Depending on system
configuration, room temperature or water temperature
will be constantly displayed on the screen.
Room temperature icon indicates
that system control is based on room
temperature.
Water temperature icon means that
the system is controlled according to
water temperature.
●The setpoint which is the temperature to be
achieved is displayed in the upper-right corner of
the screen.
●Schedule control allows you to set the unit to
operate with a set of pre-defined parameters
(heating/cooling, occupancy, setpoint) in a specific
period of time. You can always modify the schedule
if necessary.
●Additional data display: In addition to the standard
display, you may easily check other parameters,
which provide information on the general status of
the unit.
●Home anti-freeze protection is used to maintain
the minimum room temperature. When the room
temperature goes below a user-defined threshold,
the unit starts heating in order to protect the building
against freezing. No user configuration is required.
●Water anti-freeze protection is used to protect
water pipes against freezing when the outdoor
air temperature is low. No user configuration is
required.
●Alarms are used to warn of potentially dangerous
situations that may result in the failure of the unit.
●Domestic Hot Water. The DHW mode allows for
controlling hot water production provided that the
heat pump system is equipped with a domesic water
tank and a diverting DHW valve.
●Master/Slave control allows you to control up to
four units at the same time.
●Pool heating mode allows for controlling pool water
temperature provided that the heat pump system
is equipped with a specific heat exchanger and a
diverting valve.
TIP To configure the advanced parameters of the unit,
please contact professional technicians.
Occupancy
Mode Down
Schedule Up

EREBA T-HT / He EN-4
2 - WUI DISPLAY OVERVIEW
Home Screen
Please note that the home screen display may vary
depending on unit configuration and screen settings:
●Heating / Cooling / DHW mode
●Additional heating: Boiler or electric heating
●Occupancy mode control: Home/Sleep/Away
●Air temperature control (room temp.)
●Water temperature control
●Time display: 12-hour clock or 24-hour clock
⑰ ⑯
⑮
①
⑭
②
⑬
③
⑫
④
⑪
⑤
⑥ ⑦ ⑧ ⑨ ⑩
Legend:
①Days of week ⑦Cooling mode ⑬Occupancy lock
②Clock ⑧Pump running ⑭Occupancy status
③Room temperature ⑨Domestic Hot Water mode (DHW) ⑮Setpoint
④Water temperature ⑩Master / Slave control ⑯Electric heater stage
⑤Advanced settings ⑪Alarm ⑰Boiler
⑥Heating mode ⑫Temp. display / Alarm code / Message

EN-5 EREBA T-HT / He
3 - OVERVIEW OF ICONS
Days of week: Temperature display:
Monday – Sunday Room temperature
Clock:
Water temperature
12-hour or 24-hour clock display
Room temperature: Occupancy lock:
System control is based on room
temperature
Occupancy is set manually by the user
(schedule control is disabled)
Water temperature: Occupancy:
System control is based on water
temperature
HOME mode is active
Advanced settings: Occupancy:
The icon is blinking when a password
is required
SLEEP mode is active
Heating mode: Occupancy:
HEATING mode is active AWAY mode is active
Cooling mode: Setpoint:
COOLING mode is active Temperature to be achieved
(room or water temperature)
Pump status: Electric heater stage active:
Pump is running Used in the case of heat pump failure
or low outdoor air temperature
Domestic Hot Water mode (DHW): Boiler active:
DHW mode is active Used in the case of heat pump failure
or low outdoor air temperature
Master / Slave: Alarm:
Steady icon: This interface is
connected to the master unit and it is
used to control all units in the same
master/slave group
Steady icon: Alarm condition
detected; the unit is stopped
Fast flashing icon: This interface is
connected to the slave unit and it is
controlled by commands sent from the
Master
Flashing icon: Alarm condition
detected; the unit is running
Slowly flashing icon: Master/Slave
communication failure
NOTE When the user interface backlight is switched off, press any key to turn on the display.

EREBA T-HT / He EN-6
4 - PROGRAMMING THE CONTROL
4.1 Clock/Day: Setting the time and day
Before using any programming features of the WUI, it is
necessary to set the time and day of the control.
To configure time and day display
1. To access the time configuration menu, press and
hold the Schedule key for 2 seconds.
Day of week setting
2. The current day starts flashing.
3. If necessary, press the Down key or the Up key to
change the day of the week.
4. Press the Schedule key to confirm your selection
and go to the next parameter.
Time format setting
5. Once the day of the week has been confirmed, set
the time format.
6. Press the Down key or the Up key to change the
time format.
7. Press the Schedule key to confirm the time display.
You may customise the clock to display time in a 12-
hour or 24-hour format.
Example: 12-hour clock display
Example: 24-hour clock display
Time setting
8. Once the time format has been confirmed, set the time.
9. Press the Down key or the Up key to set the time.
For 24-hour format: Set the hour and press the
Schedule key to confirm. Then, set minutes and press
the Schedule key to confirm.
10. To confirm all changes, press and hold the Schedule
key for 2 seconds.
12-hour format 24-hour format

EN-7 EREBA T-HT / He
4 - PROGRAMMING THE CONTROL
4.2 Heating / Cooling / DHW only / Off:
Changing the operating mode
The operating mode display depends on the unit
configuration as well as user settings.
Heating: The heat pump heats the water
loop to the selected temperature setpoint.
Cooling: The heat pump or chiller cools
the water loop to the selected temperature
setpoint.
Domestic Hot Water only: The heat pump
is used to provide domestic hot water.
Cooling or Heating is disabled.
Example:
Mode Cooling
Occupancy Home
Temp. control Air temp. control
Room temp. 28°C
Setpoint 26°C
To set the operating mode
1. Press the Mode key successively to select the
required operating mode.
2. The icon corresponding to the selected mode will
be displayed.
Example:
1.
Mode Heating
Occupancy Home
Temp. control Water temp. control
Water temp. 34°C
Setpoint 35°C
To turn on the system
1. Press the Mode key to go from the OFF Mode to
any other mode.
To turn off the system
1. Press and hold the Mode key for 2 seconds.
2. The unit will be turned off, but the current time and
day will be still displayed on the screen.
When the unit is OFF, all operating modes described
above (cooling / heating / DHW only) are disabled.
Never turn the power off to your system in order to
ensure that the home anti-freeze protection and the
water anti-freeze protection are always available.
Example:
Mode Off

EREBA T-HT / He EN-8
4 - PROGRAMMING THE CONTROL
4.3 Home / Sleep / Away: Changing the
comfort range
To optimise energy efficiency of the building while preserving
its occupants’ comfort, the controller is normally scheduled
according to occupancy hours.
If necessary, you can select the occupancy mode manually.
Each occupancy mode is associated with a pre-defined
temperature range.
Three methods used to define the comfort range
(occupancy mode) are as follows (A/B/C):
A. Scheduling
The user can set up to 8 steps where each step is defined
by the following parameters:
• Starting time
• Occupancy mode
• Day(s) of week when it is activated
For more information about occupancy control based on
scheduling, please see “Scheduling: Assigning schedules
to heating and cooling modes” on page 12.
B. Manual setting
The user can change occupancy directly on the screen.
This setting will be effective until the next scheduling step
becomes active.
To set occupancy manually
1. Press the Occupancy key successively to select
the required occupancy mode.
2. The icon corresponding to the selected mode will be
displayed.
The heat pump or chiller is running in the Home mode
and the Home setpoint is used.
The heat pump or chiller is running in the Sleep mode
and the Sleep setpoint is used.
The heat pump or chiller is running in the Away mode
and the Away setpoint is used.
3.
Note To configure the setpoints of different occupancy
modes, refer to “ Current setpoint control: Changing the
temperature.
C. Occupancy lock
The current occupancy can be locked during a period
specified by the user (“occupancy lock”). During this
time, the scheduling will be ignored. Once this period
has elapsed, occupancy returns to the scheduling
setting.
To set the time for the selected occupancy
1. Press and hold the Occupancy key for 2 seconds.
2. The length of Home / Sleep / Away period can be set
in hours or days. Press the Down key or the Up key
to set the required number of hours/days.
3.
Example: Occupancy period (2 hours / 2 days)
Note Upon “23 Hr”, the display switches to days
(“1 d”). When set in days, the defined occupancy will end
at exactly the same time it started. Afterwards, the mode
defined by the schedule will be in force.
3. To confirm the selected occupancy, press and hold
the Occupancy key for 2 seconds.
4. The lock icon will be displayed
Example: Occupancy lock (Home)
Home Sleep Away

EN-9 EREBA T-HT / He
4 - PROGRAMMING THE CONTROL
To cancel the occupancy lock
1. Press and hold the Occupancy key for 2 seconds.
2. The display will show you the time remaining till the
end of the selected occupancy. Press the Down key
to set the counter to “0”.
3. To confirm your action, press and hold the
Occupancy key for 2 seconds.
4. The lock icon will disappear and the schedule
will be active again.

EREBA T-HT / He EN-10
4 - PROGRAMMING THE CONTROL
4.4 Current setpoint control: Changing
the temperature
Two different configurations could be available:
●If the user interface is installed on the unit (local
user interface), then the setpoint control is based
on the leaving water temperature.
●If the user interface is installed indoors (remote
user interface), then the setpoint control is based on
the room temperature.
WUI type Current setpoint
Local Water setpoint
Remote Air setpoint
WATER TEMPERATURE CONTROL
Example (water temp. and water setpoint):
Current setpoint 35°C
To achieve better comfort, it is possible to adjust the
current setpoint according to your needs.
To adjust the setpoint
1. Press the Down key to decrease the temperature.
2. Press the Up key to increase the temperature.
Please remember that the setpoint can be adjusted only
within a range defined for each occupancy mode.
Note 1 After a pre-defined period of inactivity (no key
is pressed), the setpoint information (air or water temp.
to be achieved) is dimmed. By default, the timeout is 10
minutes.
Note 2 With the method described in this section,
it is also possible to configure the setpoint for different
occupancy modes, except when setpoint control is
configured on leaving water setpoint and with the climatic
curves (depending on installer configuration). In this case,
the setpoints cannot be changed by user. If necessary,
please contact a professional technician to change the
configuration.
ROOM TEMPERATURE CONTROL
Example (room temp. and air setpoint):
Current setpoint 19°C