Daikin Altherma EHVH04S18CB3V Installer's Reference Manual page 65

# Code
[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: 0°C) (step:
1°C)
INFORMATION
Only for systems with integrated domestic hot water tank: If
backup heater operation during space heating needs to be
limited but can be allowed for domestic hot water
operation, then put [4‑00] on 1, [5‑00] on 1, and [5‑01] on –
15°C.
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.
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 a heat pump failure occurs and auto
emergency is set to Manual the domestic hot water and space
heating operations will stop and need 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,
appear on the user interface. If the house is unattended for longer
periods, we recommend that setting [A.5.1.2] Emergency shall be
set to Automatic.
# Code
[A.5.1.2] N/A Defines whether in an emergency
situation the backup heater is allowed to
automatically take over the entire heat
load or whether manual confirmation is
required.
▪ 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.5.1.2] 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 indoor unit or an auxiliary boiler.
The field setting "bivalent operation" applies only the indoor unit
space heating operation and the permission signal for the auxiliary
boiler.
Possibility 1
ERLQ004~008CA + EHVH/X04+08S18+26CB
Daikin Altherma – Low temperature split
4P384973-1A – 2016.02
Description
will
Description
The installer can set a temperature below which the boiler will
always operate when electric prices (High, Medium, Low) are "0" in
the menu structure.
NOTICE
Do NOT use overview settings!
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
deactivated.
▪ [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
# Code
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
# Code
[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 reaches the T point, then the bivalent heat source
A calc
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 is ignored.
calc
▪ [C‑04] Operation range between which T
3°C
a
b
T [C-03]+[C-04]
[C-03]
calc
T
A
T Outdoor temperature
A
8 Configuration
Description
changes between this range.
calc
Description
is calculated.
calc
Installer reference guide
65