Daikin EKHBH054BA Manuel D'installation page 29

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
temperature (T ) or operation mode of the heat pump.
DHW
[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).
If the booster heater operation is limited ([4-03]=0)
and the ambient outdoor temperature
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
heat pump OFF temperature (T
setting of [6-00] and [6-01] in "[6]" on page 28.
[4-03]=1, then booster heater heater operation is only
determined by booster heater OFF temperature (T
booster heater ON temperature (T
timer. Refer to setting "[7-00]" on page 29 and "[7-01]" on
page 29.
[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
domestic hot water temperature is 3.6°F (2°C) lower then the
heat pump OFF temperature (T
water mode (T >T
DHW HP OFF
[5-03] on page 27, [6-00] on page 28 and [6-01] on page 28).
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].
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
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 <[5-03]. (See "[C-02]" on page 32).
A
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.
EKHBH/X054BA
Indoor unit for air to water heat pump system
4PW54216-1
), domestic hot water
A
is lower than
T
A
) can be maximum the
DHW
). Refer to
HP OFF
BH OFF
) and/or schedule
BH ON
<[5-03] or T >95°F(35°C)) or
A A
) for domestic hot
HP OFF
–3.6°F(2°C)). (Refer to setting
<[5-03] independent
A
[5] Equilibrium temperature
temperature
Equilibrium temperature — The 'equilibrium temperature' field
settings apply to operation of the backup heater.
When the equilibrium temperature function is enabled, operation of
the backup heater is restricted to low outdoor temperatures, i.e. when
the outdoor temperature equals or drops below the specified
equilibrium temperature. When the function is disabled, operation of
the backup heater is possible at all outdoor temperatures. Enabling
this function reduces the working time of the backup heater.
[5-00] Equilibrium temperature status: specifies whether the
equilibrium temperature
disabled (0).
[5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
Space heating priority temperature
with a domestic hot water tank.
temperature' field settings apply to operation of the 3-way valve and
the booster heater in the domestic hot water tank.
When the space heating priority function is enabled, it is assured that
the full capacity of the heat pump is used for space heating only
when the outdoor temperature equals or drops below the specified
space heating priority temperature, i.e. low outdoor temperature. In
this case the domestic hot water will only be heated by the booster
heater.
[5-02] Space heating priority status: specifies whether space
heating priority is enabled (1) or disabled (0).
[5-03] Space
temperature below which the domestic hot water will be
heated by the booster heater only, i.e. low outdoor
temperature.
If the booster heater operation is limited ([4-03]=0)
), and the ambient outdoor temperature
the field setting to which parameter [5-03] is set and
[5-02]=1, then the domestic hot water will not be
heated.
[5-04] Set point correction for domestic hot water
temperature: set point correction for the desired domestic hot
water temperature, to be applied at low outdoor temperature
when space heating priority is enabled. The corrected
(higher) set point will make sure that the total heat capacity of
the water in the tank remains approximately unchanged, by
compensating for the colder bottom water layer of the tank
(because the heat exchanger coil is not operational) with a
warmer top layer.
T
set
T
U
T Domestic hot water set point temperature
set
T User set point (as set on the user interface)
U
T Ambient (outdoor) temperature
A
Space heating priority
and space heating
function is enabled
Applies only to installations
—
The 'space heating priority
—
heating priority temperature:
is lower than
T
A
[5-04]
[5-03]
Installation manual
priority
(1) or
outdoor
T
A
27