Heat Source Settings - Daikin ERLQ004~008CAV3 Reference Manual

INFORMATION
In case of error code AH and no interruption of the
disinfection function occurred due to domestic hot water
tapping, following actions are recommended:
▪ When the Domestic hot water > Setpoint mode >
Reheat or Reheat + sched. is selected, it is
recommended to program the start-up the disinfection
function at least 4 hours later than the last expected
large hot water tapping. This start-up can be set by
installer settings (disinfection function).
▪ When the Domestic hot water > Setpoint mode >
Scheduled only is selected, it is recommended to
program a Storage eco 3 hours before the scheduled
start-up of the disinfection function to preheat the tank.
INFORMATION
Disinfection function is restarted in case the domestic hot
water temperature drops 5°C below the disinfection target
temperature within the duration time.
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)
# Code
[A.5.1.1] [4-00] Backup heater operation:
▪ 0: Disabled
▪ 1: Enabled
▪ 2:
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:
▪ 1: Allowed
▪ 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:
▪ 1: Allowed
▪ 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?
▪ 1: NOT allowed
▪ 0: Allowed
ERLQ004~008CAV3 + EHVH/X04+08S18CA + EHVH/X08S26CA
Daikin Altherma - Low Temperature Split
4P313775-1C – 2012.11
Description
Limited, only enabled during
# 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.
8 Configuration
Description
temperature below which
Installer reference guide
59