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Installer reference guide
47
EHBH/X16
Daikin Altherma - Low Temperature Split
4P313776-1 – 2012.05
8 Configuration
8.3.3 Heat source settings
Backup heater
For systems without domestic hot water tank or with separate
domestic hot water tank (only for
EHBH/X
)
Backup heater operation mode: defines when backup heater
operation is enabled or disabled. This setting is only overruled when
backup heating is required during defrost operation or malfunctioning
of the outdoor unit (when [A.5.1.2] [4-06] is enabled)
For systems with an integrated domestic hot water tank (only for
EHVH/X
)
Backup heater operation mode: defines when backup heater
operation is disabled or only allowed during domestic hot water
operation. This setting is only overruled when backup heating is
required during defrost operation or malfunctioning of the outdoor unit
(when [A.5.1.2] [4-06] is enabled)
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 — which heating
source can/will provide the space heating, either the Daikin indoor
unit or an auxiliary boiler.
The field setting "bivalent operation" apply only the indoor unit space
heating operation and the permission signal for the auxiliary boiler.
When the "bivalent operation" function is enabled, the indoor unit will
stop automatically in space heating operation when the outdoor
temperature drops below "bivalent ON temperature" and the
permission signal for the auxiliary boiler becomes active.
When the bivalent operation function is disabled, the space heating
by indoor unit is possible at all outdoor temperatures (see operation
ranges) and permission signal for auxiliary boiler is always
disactivated.
Q
[C-03] Bivalent ON temperature: defines the outdoor
temperature below which the permission signal for the auxiliary
boiler will be active (closed, KCR on EKRP1HB) and space
heating by indoor unit will be stopped.
Q
[C-04] Bivalent hysteresis: defines the temperature difference
between bivalent ON temperature and bivalent OFF
temperature.
Permission signal X1–X2 (
EKRP1HB
)
INFORMATION
Disinfection function is restarted in case the domestic hot
water temperature drops 5°C below the disinfection target
temperature within the duration time.
#
Code
Description
[A.5.1.1]
[4-00]
Backup heater operation:
Q
0: Disabled
Q
1: Enabled
Q
2: Limited, only enabled during
domestic hot water operation of for
system with integrated domestic hot
water tank.
[A.5.1.2]
[4-06]
Defines if during emergency operation
the backup heater is:
Q
1: Allowed
Q
0: NOT allowed
Emergency operation will startup backup
heater operation during certain outdoor
malfunctions.
[A.5.1.3]
[4-07]
Defines whether backup heater second
step is:
Q
1: Allowed
Q
0: NOT allowed
In this way it is possible to limit the
backup heater capacity.
N/A
[5-00]
Is backup heater operation allowed
above equilibrium temperature during
space heating operation?
Q
1: NOT allowed
Q
0: Allowed
[A.5.1.4]
[5-01]
Equilibrium temperature.
Outdoor temperature below which
operation of the backup heater is
allowed.
INFORMATION
Only for systems with integrated domestic hot water tank: If
the storage temperature set point is higher than 50°C,
Daikin recommends NOT to disable the backup heater
second step because it will have a big impact on the
required time for the unit to heat up the domestic hot water
tank.
T
A
Outdoor temperature
CAUTION
Make sure to observe all rules mentioned in application
guideline 5 when bivalent operation function is enabled.
Daikin shall not be held liable for any damage resulting
from failure to observe this rule.
INFORMATION
Q
The combination of setting [4-03]=0/2 with bivalent
operation at low outdoor temperature can result in
domestic hot water shortage.
Q
The bivalent operation function has no impact on the
domestic water heating mode. The domestic hot water
is still and only heated by the indoor unit.
Q
The permission signal for the auxiliary boiler is located
on the EKRP1HB (digital I/O PCB). When it is
activated, the contact X1, X2 is closed and open when
it is disactivated. See illustration below for the
schematic location of this contact.
#
Code
Description
N/A
[C-03]
ON temperature.
If the outdoor temperature drops below
this temperature, the bivalent heat
source permission signal will be active.
N/A
[C-04]
Hysteresis.
Temperature difference between bivalent
heat source ON and OFF to prevent too
much switching.
YC Y1 Y2 Y3 Y4
X1
X2
X3
X4
OFF ON
X2M
SS1
X1M
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