Operation manual
3
EKHBH/XE008BA
Indoor unit for air to water heat pump system and options
4PW56302-1
O
PERATING
THE
DIGITAL
CONTROLLER
Operating the EKHB* unit comes down to operating the digital
controller.
Features and functions
The digital controller is a state of the art controller that offers full
control over your installation. It can control a heating/cooling and a
heating only installation.
Both installations are available in multiple versions which vary in
capacity, electrical supply and installed equipment (with an optional
domestic hot water tank with a booster heater).
Basic controller functions
The basic controller functions are:
■
Turning the unit ON/OFF.
■
Operation mode change-over:
-
space heating (refer to
-
space cooling (refer to
-
domestic water heating (refer to
■
Selection of features:
-
quiet mode (refer to
-
weather dependent control (refer to
■
Temperature set point adjustment (refer to
).
The digital controller supports a power cut off of maximum 2 hours.
When autorestart is enabled (see
allows a power supply shut down of 2 hours without user intervention.
Clock function
The clock functions are:
■
24 hour real time clock.
■
Day of the week indicator.
Schedule timer function
The schedule timer function allows the user to schedule the
operation of the installation according to a daily or a weekly program.
Emergency backup heater operation always has
priority over compressor or booster heater operation.
Emergency backup heater operation occurs because of:
■
User request to heat up water to the space heating
loops. The temperature of this water is too low and is
out of the operation range (during initial start-up for
example). Refer to "Initial start-up at low outdoor
ambient temperatures" and "Re-start at low outdoor
ambient temperatures" in the installation manual.
■
During heating operation the water temperature
becomes too low and drops out of the operation
range. Refer to "Checking the water volume and
expansion vessel pre-pressure" in the installation
manual to minimize the backup heater operation.
■
Malfunction of the heat pump unit.
If during backup heater operation the heating load is higher
than the heater capacity, the water temperature can not
increase. In this case refer to "Re-start at low outdoor
ambient temperatures" in the installation manual.
Balance between space heating/cooling demand and
domestic hot water demand
■
Only if the unit is correctly sized then at some point
during space cooling/heating operation the unit will
reach the requested setpoint. When this occurs,
domestic water heating by compressor becomes
possible.
To ensure domestic hot water production, the
schedule timers must be used to disable space
heating/cooling. Refer to the extra addendum of the
operation manual on how to program the schedule
timers.
■
Booster heater operation is only possible when the
compressor of the heatpump is not operating. The
compressor operates because of space
cooling/heating demand or because of domestic water
heating.
To ensure domestic hot water production, the
schedule timers must be used to disable space
heating/cooling. Refer to the extra addendum of the
operation manual on how to program the schedule
timers.
■
If using a room thermostat, domestic water heating by
compressor or by booster heater is
NOT
possible as
long as the room thermostat demands cooling or
heating.
In this case de-activate the room thermostat demand
by its schedule timer.
Refer to the manual of the room thermostat for a
detailed explanation how to de-activate space
cooling/heating by schedule timer, or refer to the
separate addendum for an example of the Daikin
room thermostat schedule timer programming.
CAUTION
Never let the digital controller get wet. This may cause an
electric shock or fire.
Never press the buttons of the digital controller with a hard,
pointed object. This may damage the digital controller.
Never inspect or service the digital controller yourself, ask
a qualified service person to do this.
■
Descriptions in this manual that apply to a specific
installation or that depend on the installed equipment,
are marked with an asterisk (*).
■
Some functions described in this manual may not be
available or should not be available. Ask your installer
or your local dealer for more information on
permission levels.
(*) The functions 'space cooling' and 'domestic water
heating' can only be selected when the corresponding
equipment is installed.
