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Installation manual
22
EKCBX/H008BBV3
Unit for air to water heat pump system
4PW66983-1C – 08.2011
12.3. 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
)
12.4. Domestic hot water tank installation
configuration
12.5. 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
INFORMATION
To set the pump speed, refer to
INFORMATION
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
the table below.
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
.
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 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
Backup/booster heater operation and space heating off
temperature" on page 26
for more details.
INFORMATION
Heating between 15°C and 25°C is performed by the
backup heater only (EKMBUH unit) (if installed).
INFORMATION
The function underfloor heating screed dry-out program
offers the possibility to execute automatically the gradual
heat up. See
"13.3. Underfloor heating screed dry-out
4
3
2
1
ON
OFF
4
3
2
1
ON
OFF
