Daikin ERLQ004CA Installer's Reference Manual page 67

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 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
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?
ERLQ004~008CA + EHBH/X04+08CB
Daikin Altherma – Low temperature split
4P384972-1B – 2017.04
Description
changes between this range.
calc
Description
# Code
[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
T Calculated temperature
calc
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)
It is recommended to choose [C‑04] bigger than the default value to
have an optimal operation when choosing possibility 2. Depending
on the used boiler, the boiler efficiency should be chosen as follows:
# Code
[A.6.A] [7‑05] ▪ 0: Very high
▪ 1: High
▪ 2: Medium
▪ 3: Low
▪ 4: Very low
INFORMATION
Electricity price can only be set when bivalent is ON
([A.2.2.6.1] or [C-02]). These values can only be set in
menu structure [7.4.5.1], [7.4.5.2] and [7.4.5.3]. Do NOT
use overview settings.
INFORMATION
Boiler efficiency [A.6.A] or [7‑05] becomes visible when
bivalent is ON ([A.2.2.6.1] or [C‑02]).
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.
8 Configuration
Description
is calculated.
calc
Description
Description
Installer reference guide
67