8 Configuration
Installer reference guide
58
EWAQ+0 EK(2)CB
EKMB9W1
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492901-1 – 2017.06
#
Code
Description
[A.5.1.4]
[5‑01]
Equilibrium temperature.
Outdoor temperature below which
operation of the backup heater is
allowed.
Range: –15°C~35°C (default: –4°C)
(step: 1°C)
Auto emergency
When the heat pump fails to operate, the backup heater can serve
as an emergency heater and either automatically or non-
automatically take over the heat load.
▪ When auto emergency is set to Automatic and a heat pump failure
occurs, the backup heater will automatically take over the heat
load.
▪ When auto emergency is set to Manual and a heat pump failure
occurs, space heating operation will stop and needs to be
recovered manually. The user interface will then ask you to
confirm whether the backup heater can take over the heat load or
not.
When the heat pump fails, will appear on the user interface. If the
house is unattended for longer periods, we recommend to set
[A.6.C] Emergency to Automatic.
#
Code
Description
[A.6.C]
N/A
Emergency:
▪ 0: Manual (default)
▪ 1: Automatic
INFORMATION
The auto emergency setting can be set in the menu
structure of the user interface only.
INFORMATION
If a heat pump failure occurs and [A.6.C] is set to Manual,
the room frost protection function, the underfloor heating
screed dryout function, and the water pipe antifreeze
function will remain active even if the user does NOT
confirm emergency operation.
Bivalent
Applies only to installations with an auxiliary boiler (alternating
operation, parallel connected). The purpose of this function is to
determine — based on the outdoor temperature (possibility 1) or on
energy prices (possibility 2) — which heating source can/will provide
the space heating, either the outdoor unit or an auxiliary boiler.
The field setting "bivalent operation" applies only to the space
heating operation of the outdoor unit and the permission signal for
the auxiliary boiler.
Possibility 1
The installer can set a temperature below which the boiler will
always operate when the electricity prices (High, Medium, Low) are
"0" in the menu structure.
NOTICE
Do NOT use overview settings!
When "bivalent operation" function is enabled, the outdoor unit will
stop automatically with space heating operation when the outdoor
temperature drops below the "bivalent ON temperature", and the
permission signal for the auxiliary boiler becomes active.
When the bivalent operation function is disabled, space heating
operation by the outdoor unit is possible at all outdoor temperatures
(see operation ranges), and the permission signal for the auxiliary
boiler is ALWAYS deactivated.
▪ [C‑03] Bivalent ON temperature: defines the outdoor temperature
below which the permission signal for the auxiliary boiler will be
active (closed, X8M/3+4 on option box EK2CB07CAV3) and
space heating by the outdoor unit will be stopped.
▪ [C‑04] Bivalent hysteresis: defines the temperature difference
between bivalent ON temperature and bivalent OFF temperature.
Permission signal
X8M/3+4
(
on option box EK2CB07CAV3
)
T
A
[C-03]
[C-04]
a
b
T
A
Outdoor temperature
a
Closed
b
Open
#
Code
Description
N/A
[C-03]
Range: –25°C~25°C (default: 0°C) (step:
1°C)
N/A
[C-04]
Range: 2°C~10°C (default: 3°C) (step:
1°C)
Possibility 2
The installer can set a temperature range ([C‑04]). Depending on the
energy prices, a calculated point T
calc
changes between this range.
#
Code
Description
[7.4.5.1]
N/A
What is the high electricity
price?
[7.4.5.2]
N/A
What is the medium electricity
price?
[7.4.5.3]
N/A
What is the low electricity
price?
[7.4.6]
N/A
What is the fuel price?
NOTICE
Do NOT use overview settings!
When T
A
reaches the T
calc
point, then the bivalent heat source
permission will be active. To prevent too much switching, there is a
hysteresis of 3°C.
▪ [C‑03] ON temperature. Below this temperature, bivalent will
always be ON. T
calc
is ignored.
▪ [C‑04] Operation range between which T
calc
is calculated.
T
A
T
calc
[C-03]+[C-04]
3°C
[C-03]
a
b
T
A
Outdoor temperature
T
calc
Calculated temperature
a
Closed
b
Open
#
Code
Description
N/A
[C-03]
Range: –25°C~25°C (default: 0°C) (step:
1°C)
N/A
[C-04]
Range: 2°C~10°C (default: 3°C) (step:
1°C)
To have an optimal operation when choosing possibility 2, it is for
[C‑04] recommended to choose a higher value than the default
value. Depending on the used boiler, the boiler efficiency should be
chosen as follows:
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