Daikin EKHBH030BA, Installation Manual

Page: 29 / 136

EKHBH/X030BA
Indoor unit for air to water heat pump system
4PW62568-1 – 07.2010
Installation manual
27
[3] Auto restart
When power returns after a power supply failure, the auto restart
function reapplies the user interface settings at the time of the power
supply failure.
Note that with the function disabled the schedule timer will not be
activated when power returns to the unit after a power supply failure.
Press the
pr
button to enable the schedule timer again.
■
[3-00] Status: defines whether the auto restart function is
turned ON (0) or OFF (1).
[4] Backup/booster heater operation and space heating off
temperature
Backup heater operation
The operation of the backup heater can altogether be enabled or
disabled, or it can be disabled depending on operation of the booster
heater.
■
[4-00] Status: defines whether backup heater operation is
enabled (1) or disabled (0).
■
[4-01] Priority: defines whether backup heater and booster
heater can operate simultaneously (0), or if the booster
heater operation has priority over the backup heater
operation (1), or if the backup heater operation has priority
over the booster heater operation (2).
Space heating off temperature
■
[4-02] Space heating off temperature: outdoor temperature
above which space heating is turned off, to avoid
overheating.
Booster heater operation
Applies only to installations with a domestic hot water tank.
The operation of the booster heater can be enabled or limited
depending on outdoor temperature (T
A
), domestic hot water
temperature (T
DHW
) or operation mode of the heat pump.
■
[4-03] Booster heater operation: defines whether the optional
booster heater operation is enabled (1) or has certain
limitations (0/2/3).
Explanation of settings of [4-03]
Booster heater will/can only operate if domestic hot water mode
is activated (
w ).
■
[4-03]=0, then booster heater operation is only allowed
during "[2] Disinfection function" and "Powerful domestic
water heating" (see operation manual).
This setting is only recommended in case the capacity of the
heat pump can cover the heating requirements of the house
and domestic hot water over the complete heating season.
The result of this setting is that the domestic hot water will
never be heated by the booster heater except for
"[2]
Disinfection function" and "Powerful domestic water
heating" (see operation manual).
■
[4-03]=1, then booster heater heater operation is only
determined by booster heater OFF temperature (T
BH OFF
),
booster heater ON temperature (T
BH ON
) and/or schedule
timer. Refer to setting "[7-00]" on page 29 and "[7-01]" on
page 30.
■
[4-03]=2, then booster heater operation is only allowed if heat
pump is out of "operation range" of heat pump domestic
water heating mode (T
A
<[5-03] or T
A
>95°F(35°C)) or
domestic hot water temperature is 3.6°F (2°C) lower then the
heat pump OFF temperature (T
HP OFF
) for domestic hot
water mode (T
DHW
>T
HP OFF
–3.6°F(2°C)). (Refer to setting
[5-03] on page 28, [6-00] on page 29 and [6-01] on page 29).
Results in the most optimum coverage of domestic hot water
heated by the pump.
■
[4-03]=3, then booster heater operation is the same as
setting 1, except that booster heater is OFF when the heat
pump is active in domestic hot water mode. The
consequence of this functionality is that setting [8-03] is not
relevant.
Results in optimum coverage of domestic hot water heated
by heat pump in relation with [8-04].
WARNING
Be aware that the domestic hot water temperature at the
hot water tap will be equal to the value selected in field
setting [2-03] after a disinfection operation.
If this high domestic hot water temperature can be a
potential risk for human injuries, a mixing valve (field
supply) shall be installed at the hot water outlet connection
of the domestic hot water tank. This mixing valve shall
secure that the hot water temperature at the hot water tap
never rise above a set maximum value. This maximum
allowable hot water temperature shall be selected
according to local laws and regulations.
NOTE It is therefore recommended to leave the auto restart
function enabled.
NOTE If the benefit kWh rate power supply is of the type that
power supply is interrupted, then always allow the auto
restart function.
NOTE When the priority field setting is set to
ON (1), space heating performance of the
system might be decreased at low outdoor
temperatures, since in case of domestic
water heating demand the backup heater will
not be available for space heating (space
heating will still be provided by the heat
pump).
When the priority field setting is set to
ON (2), domestic water heating performance
of the system might be decreased at low
outdoor temperatures, since in case of space
heating demand the booster heater will not
be available for domestic water heating.
However domestic water heating by heat
pump will still be available.
When the priority field setting is set to OFF
(0), make sure that electrical power
consumption does not exceed supply limits.
If the booster heater operation is limited ([4-03]=0)
and the ambient outdoor temperature
T
A
is lower than
the field setting to which parameter [5-03] is set and
[5-02]=1, then the domestic hot water will not be
heated.
The consequence of this setting is that the domestic
hot water temperature (T
DHW
) can be maximum the
heat pump OFF temperature (T
HP OFF
). Refer to
setting of [6-00] and [6-01] in "[6]" on page 29.
■
When setting [4-03]=1/2/3, the booster heater
operation can still be restricted by the schedule
timer as well. I.e., when booster heater operation
is preferred during certain period of the day. (See
operation manual)
■
When setting [4-03]=2, the booster heater will be
allowed to operate when T
A
<[5-03] independent
of the status of [5-02]. If bivalent operation is
enabled and permission signal for auxiliary boiler
is ON, the booster heater will be restricted even
when T
A
<[5-03]. (See "[C-02]" on page 32).
■
Booster heater is always allowed during powerful
and disinfection function, except for the period
that the backup heater operation is required for
safety reasons and [4-02]=1.
4PW62568-1.book Page 27 Wednesday, June 30, 2010 12:02 PM