Installation manual
25
EKHBH/X008BB
Indoor unit for air to water heat pump system
4PW62570-1A – 01.2011
8.4.
Domestic hot water tank installation
configuration
As mentioned in
"Domestic hot water tank (option)" on page 3
types of domestic hot water tanks are available:
■
tank with built-in electrical booster heater (EKHW*)([4-03]
default value will be 3),
■
tank without electrical booster heater (EKHTS)([4-03] default
value will be 5).
8.5.
Initial start-up at low outdoor ambient
temperatures
(1)
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
8.6.
Pre-operation checks
Checks before initial start-up
After the installation of the unit, check the following before switching
on the circuit breaker:
1
Installation
Check that the unit is properly installed to avoid abnormal noises
and vibrations when starting the unit.
2
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
"7. Electrical wiring work" on page 18
, according to the
wiring diagrams and according to the applicable legislation.
3
Fuses or protection devices
Check that the fuses or the locally installed protection devices
are of the size and type specified in the chapter
. Make sure that neither a fuse nor a
protection device has been bypassed.
4
Backup heater circuit breaker F1B/F3B
Do not forget to turn on the backup heater circuit breaker F2B in
the switch box (F1B/F3B depends on the backup heater type).
Refer to the wiring diagram.
5
Booster heater circuit breaker F2B
(2)
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).
6
Earth wiring
Make sure that the earth wires have been connected properly
and that the earth terminals are tightened.
7
Internal wiring
Visually check the switch box on loose connections or damaged
electrical components.
Dual set point
Configuration
Pump operation
y
y
y
y
=
=
=
=
p
p
p
pr
r
r
r
• [7-02]=1
• SS2-3=OFF
• wiring:
determined by leaving
water temperature
(a)
(a) The pump will stop when space heating/cooling is turned off or when the water
reaches the desired water temperature as set on the user interface. With space
heating/cooling turned on, the pump will then run every 5 minutes during 3
minutes to check the water temperature.
UI
UI
UI
• [7-02]=1
• SS2-3=ON
• wiring:
on when main or/and
sub set point is
requested
SP2/SP1
UI
—
SP1 = First set point contact
SP2 = Second set point contact
■
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
.
NOTICE
For correct operation of the system, it is very important to
make the correct and complete wiring connections
between indoor unit and switch box
(a)
of the domestic hot
water tank before setting SS2-2 to ON.
The applicable logic and settings (example [4-03] default)
are activated according to the connected tank. See
"[4] Backup/booster heater operation and space heating
off temperature" on page 28
for more details.
(a) Only applicable for tank with built-in electrical booster heater (EKHW*).
X2M
SP1
SP2
1
2
3
4
X2M
1
2
3
4
SP1
SP2
4
3
2
1
ON
OFF
4
3
2
1
ON
OFF
(1) When the unit is configured for restricted power supply condition mode,
see
.
INFORMATION
If leaving water temperature is set between 15°C and
25°C, heating is performed by the backup heater only.
INFORMATION
The function underfloor heating screed dry-out program
offers the possibility to execute automatically the gradual
heat up. See
Underfloor heating screed dry-out
DANGER
Switch off all relevant power supply before making any
connections.
(2) Only applicable for tank with built-in electrical booster heater (EKHW*).
