Daikin Altherma Installer's Reference Manual page 61

# Code
[A.5.1.4] [5-01] Equilibrium temperature.
Outdoor
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.
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.
▪ [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.
▪ [C-04] Bivalent hysteresis: defines the temperature difference
between bivalent ON temperature and bivalent OFF temperature.
Permission signal X1–X2 (EKRP1HB)
a
[C-04]
b
T
A
[C-03]
T Outdoor temperature
A
a closed
b open
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
▪ The combination of setting [4-03]=0/2 with bivalent
operation at low outdoor temperature can result in
domestic hot water shortage.
▪ 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.
▪ 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.
ERLQ004~008CAV3 + EHBH/X04+08CA
Daikin Altherma - Low Temperature Split
4P313774-1C – 2012.11
Description
temperature below which
X2M
X1M
YC Y1 Y2 Y3 Y4
# Code
N/A [C-03] ON temperature.
If the outdoor temperature drops below
this
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.
Bottom plate heater
Applies only to installation with an outdoor unit ERHQ and the option
bottom plate heater kit is installed.
▪ [F-02] Bottom plate heater ON temperature: defines the outdoor
temperature below which the bottom plate heater will be activated
by indoor unit in order to prevent ice build-up in the bottom plate of
the outdoor unit at lower outdoor temperatures.
▪ [F-03] Bottom plate heater hysteresis: defines the temperature
difference between bottom plate heater ON temperature and the
bottom plate heater OFF temperature.
Bottom plate heater
a
[F-03]
b
T
A
[F-02]
T Outdoor temperature
A
a On
b OFF
CAUTION
The bottom plate heater is controlled via EKRP1HB.
# Code
N/A [F-02] Bottom plate heater ON temperature:
3~10°C
Default: 3°C
N/A [F-03] Hysteresis: 2~5°C
Default: 5°C
INFORMATION
Dependent from setting [F-04] contact Y2 located on digital
I/O PCB (EKRP1HB) controls the option bottom plate
heater. See illustration below for the schematic location of
this contact. For complete upwiring, see "15.6 Wiring
diagram" on page 84.
8 Configuration
OFF ON
SS1
Description
temperature, the bivalent heat
Description
Installer reference guide
61