Domestic Hot Water Tank Installation Configuration; Initial Start-Up At Low Outdoor Ambient Temperatures; Re-Start At Low Outdoor Ambient Temperatures; Pre-Operation Checks - Daikin EKHBHE008BA3V3 Installation Manual

Domestic hot water tank installation configuration
When no domestic hot water tank is
installed, toggle switch SS2-2 should be set to
OFF (default).
When a domestic hot water tank is installed,
toggle switch SS2-2 should be set to ON.
When SS2-3 was set to ON without all necessary and
correct wiring connections between indoor unit and
switchbox of the domestic hot water tank, the error code AC
will be displayed on the user interface.

Initial start-up at low outdoor ambient temperatures

During initial start-up and when water temperature is low, it is
important that the water is heated gradually. Failure to do so may
result in cracking of concrete floors due to rapid temperature change.
Please contact the responsible cast concrete building contractor for
further details.
To do so, the lowest leaving water set temperature can be decreased
to a value between 15°C and 25°C by adjusting the field setting
[9-01] (heating set point lower limit). Refer to
page 23.
If leaving water temperature is set between 15°C and
25°C, heating is performed by the backup heater only.

Re-start at low outdoor ambient temperatures

When re-starting at low ambient temperature, it is important to
ensure that the unit operates within its operation range as soon as
possible (water temperature ≥30°C) by reducing the load as much as
possible during start-up. This procedure is applicable whenever the
water temperature is out of the operation range (e.g. after long period
of stand still, ...).
For example:
You can do this by switching off the fans of the fan coil units until the
water temperature has increased to 30°C.
OR
For floor heating applications: start up circuit by circuit using a
(automatic) by-pass valve guaranteeing that water returning to the
unit is more than 20°C.

Pre-operation checks

Checks before initial start-up
DANGER
Switch off all relevant power supply before making any
connections.
After the installation of the unit, check the following before switching
on the circuit breaker:
1 Field wiring
Make sure that the field wiring between local supply panel and
indoor unit, outdoor unit and indoor unit, indoor unit and valves
(when applicable), indoor unit and room thermostat (when
applicable), and indoor unit and domestic hot water tank has
been carried out according to the instructions described in the
chapter "Field wiring" on page
diagrams and according to European and national regulations.
Installation manual
22
1 2 3 4
1 2 3 4
"Field settings" on
17, according to the wiring
2 Fuses or protection devices
Check that the fuses or the locally installed protection devices
are of the size and type specified in the chapter
specifications" on page 37. Make sure that neither a fuse nor a
protection device has been bypassed.
3 Backup heater circuit breaker F1B/F3B
Do not forget to turn on the backup heater circuit breaker F2B in
the switchbox (F1B/F3B depends on the backup heater type).
Refer to the wiring diagram.
4 Booster heater circuit breaker F2B
Do not forget to turn on the booster heater circuit breaker F2B in
the switch box (applies only to units with optional domestic hot
water tank installed).
5 Earth wiring
Make sure that the earth wires have been connected properly
and that the earth terminals are tightened.
6 Internal wiring
Visually check the switch box on loose connections or damaged
electrical components.
7 Fixation
Check that the unit is properly fixed, to avoid abnormal noises
and vibrations when starting up the unit.
8 Damaged equipment
Check the inside of the unit on damaged components or
squeezed pipes.
9 Refrigerant leak
Check the inside of the unit on refrigerant leakage. If there is a
refrigerant leak, call your local dealer.
10 Power supply voltage
Check the power supply voltage on the local supply panel. The
voltage must correspond to the voltage on the identification label
of the unit.
11 Air purge valve
Make sure the air purge valve is open (at least 2 turns).
12 Pressure relief valve
Check if the backup heater is completely filled with water by
operating the pressure relief valve. It should purge water instead
of air.
NOTE Operating the system with the backup heater not
completely filled with water will damage the backup
heater!
13 Shut-off valves
Make sure that the shut-off valves are correctly installed and
fully open.
NOTE Operating the system with closed valves will damage
the pump!

Powering up the indoor unit

When power supply to the indoor unit is turned on, "88" is displayed
on the user interface during its initialisation, which might take up to
30 seconds. During this process the user interface cannot be
operated.
"Technical
EKHBH/XE008BA
Indoor unit for air to water heat pump system
4PW56301-1A