Daikin EKHBH016BB6V3 Instruction Manual page 39

■ [C-04] Bivalent hysteresis: defines the temperature difference
between bivalent ON temperature and bivalent OFF
temperature.
Permission signal X1–X2 (EKRP1HB)
closed
open
T Outdoor temperature
A
CAUTION
Make sure to observe all rules mentioned in
application 5 when bivalent operation function is
enabled.
Daikin shall not be held liable for any damage
resulting from failure to observe this rule.
INFORMATION
■
In case the outdoor unit is NOT ERLQ_CA* or
ERHQ_W1+ERLQ_W1,
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.
X2M
EKHBH/X016BB
Indoor unit for air to water heat pump system
4PW62572-1A – 01.2011
[C-04]
T
[C-03] A
the combination
OFF ON
SS1
X1M
YC Y1 Y2 Y3 Y4
Additional external backup heater permission signal [C-02]=2
This function gives the possibility to drive an additional external
backup heater.
The additional external backup heater can be used to assist space
heating (not domestic 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.
INFORMATION
When [4-07] "Backup heater second step" is disabled, then
the additional external backup heater signal will never be
activated.
■ [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
of
External backup
(EKRP1HB)
T Outdoor temperature
A
CAUTION
It is the responsibility of the installer to make sure no
unwanted situations can occur and that all safeties are
implemented according to applicable legislation.
Daikin shall not be held liable for any damage resulting
from failure to observe this rule.
INFORMATION
Permission signal X1–X2 can only be for the bivalent
operation OR external backup heater permission signal.
Both functions cannot be used at the same time.
heater permission
closed
[C-04]
open
[C-03]
signal X1–X2
T
A
Installation manual
36