Installation manual
22
EKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54185-1B
Pump operation configuration
Without room thermostat: DIP switch SS2-3 = OFF
When no thermostat is connected to the indoor unit, pump operation
will be determined by the leaving water temperature.
To force continuous pump operation when no room thermostat is
connected do the following:
-
set toggle switch SS2-3 to ON,
-
short-circuit the terminal numbers 1-2-4 on the terminal block
in the switch box.
With room thermostat DIP switch: SS2-3 = ON
When the thermostat is connected to the indoor unit, the pump will
operate continuously whenever there is heating or cooling demand
requested by the thermostat.
Dual set point
When dual set point is enabled, the pump operation will be
determined depending on the status of the DIP switch SS2-3 and set
point selection contacts. Refer to the pump operation configurations
when the thermostat is connected or not as described above.
The following table summarizes the required configuration and wiring
at the terminal block (X2M: 1, 2, 4) in the switch box. Pump operation
is listed in the third column. The three last columns indicate whether
the following functionality is available on the user interface (UI) or
handled by the set point selection contacts SP1 and SP2:
•
space heating or cooling on/off (
y
)
•
heating/cooling changeover (
=
)
•
heating and cooling schedule timers (
pr
)
Domestic hot water tank installation configuration
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
Pre-operation checks
Checks before initial start-up
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
diagrams and according to European and national regulations.
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
. 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.
NOTE
To set the pump speed, refer to
When dual set point is enabled, the "forced continuous
pump operation" is not possible. When SS2-3 is ON while
SP1 and SP2 are both closed, the pump operation will be
the same operation as "with room thermostat" and the
second set point will be the applicable set point. Refer to
"Dual set point control" on page 27
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
X2M
SP1
SP2
1
2
3
4
X2M
1
2
3
4
SP1
SP2
■
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.
Heating between 15°C and 25°C is performed by the
backup heater only.
DANGER
Switch off all relevant power supply before making any
connections.
4
3
2
1
ON
OFF
4
3
2
1
ON
OFF
