EKHVH/X00 EKHVH/9WN
Daikin Altherma indoor unit
4PW64329-1 – 07.2010
Installation manual
33
Additional external backup heater operation [C-02]=2
This function give the possibility to drive an additional external
backup heater.
The additional external backup heater can be used to assist space
heating (not domestic hot water heating) during low ambient
conditions.
The signal for additional external heater will be activated when the
second step of the internal backup heater is closed and when the
outdoor temperature goes below [C-03] setting with [C-04] hysteresis.
■
[C-02]=2 Additional external backup heater operation is
enabled (2)
■
[C-03] external backup heater ON temperature: defines the
outdoor temperature below which the permission signal for
the external backup heater will be active (closed, KCR on
EKRP1HB).
■
[C-04] external backup heater hysteresis
External backup heater signal X1–X2 (EKRP1HB)
[D] Benefit kWh rate power supply/Local shift value weather
dependent
Benefit kWh rate power supply
■
[D-00] Switching off heaters: Defines which heaters are
switched off when the benefit kWh rate signal of the
electricity company is received.
If [D-01]=1 or 2 and the benefit kWh rate signal of the
electricity company is received, following devices will be
switched off:
■
[D-01] Unit connection to benefit kWh rate power supply:
Defines whether or not the outdoor unit is connected to a
benefit kWh rate power supply.
If [D-01]=0, the unit is connected to a normal power supply
(default value).
If [D-01]=1 or 2, the unit is connected to a benefit kWh rate
power supply. In this case the wiring requires specific
installation like explained in
"Connection to a benefit kWh
rate power supply" on page 22
.
When parameter [D-01]=1 at the moment that the benefit
kWh rate signal is sent by the electricity company, that
contact will open and the unit will go in forced off mode
(1)
.
When parameter [D-01]=2 at the moment that the benefit
kWh rate signal is sent by the electricity company, that
contact will close and the unit will go in forced off mode
(2)
.
When backup heater is forced off at "benefit kWh rate power
supply" it is possible to define if pump operation is forced off
or permited. (Refer to
"[D-05]" on page 34
.)
Local shift value weather dependent
The local shift value weather dependent field setting is only relevant
in case weather dependent set point (see field setting
"[1] Weather
dependent set point" on page 27
) is selected.
■
[D-03] Local shift value weather dependent: determines the
shift value of the weather dependent set point around
outdoor temperature of 0°C.
CAUTION
■
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 figure for the
schematic location of this contact.
When [4-07] "Backup heater second step" is disabled, then
additional external backup heater signal will never be
activated.
T
A
Outdoor temperature
YC Y1 Y2 Y3 Y4
X1
X2
X3
X4
OFF ON
X2M
SS1
X1M
T
A
[C-03]
[C-04]
closed
open
[D-00]
Compressor
Backup heater
0 (default)
Forced off
Forced off
2
Forced off
Permitted
Do not select 1 or 3 value.
[D-00] settings 2 is only meaningful if the benefit
kWh rate power supply is of the type that power
supply is not interrupted.
(1) When the signal is released again, the voltage free contact will close and
the unit will restart operation. It is therefore important to leave the auto
restart function enabled. Refer to
"[3] Auto restart" on page 28
.
(2) When the signal is released again, the voltage free contact will open and
the unit will restart operation. It is therefore important to leave the auto
restart function enabled. Refer to
"[3] Auto restart" on page 28
.
T
t
Target water temperature
T
A
Outdoor temperature
R
Range
L
Local shift value
[1-00], [1-01],
[1-02], [1-03]
Applicable field setting of the weather dependent set
point [1]
T
A
T
t
[1-03]
[1-00]
0
°
C
[1-01]
[1-02]
L
R
Summary of Contents for EKHVH008BB6V3
Page 47: ...NOTES NOTES...
