heater.
■
■
■
Booster heater operation
■
[4-04] Freeze protection function: avoids freezing of the
Applies only to installations with a domestic hot water tank.
water piping between home and unit. In case of low ambient
temperatures it will activate the pump and in case of low
The operation of the booster heater can be enabled or limited
water temperatures it will additionally activate the backup
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).
Default freeze protection function takes into account freezing
of water piping which is insufficiently insulated.
Basically it means that the pump is activated whenever
ambient temperatures become close to freezing,
independently of the working temperature.
Explanation of settings of [4-03]
[5] Equilibrium
temperature
and space heating priority
Booster heater will/can only operate if domestic hot water mode
temperature
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).
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 function is enabled (1) or
disabled (0).
If the booster heater operation is limited ([4-03]=0)
■
[5-01] Equilibrium temperature: outdoor temperature below
and the ambient outdoor temperature
T
A
is lower than
which operation of the backup heater is allowed.
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.
Space heating priority temperature
—
Applies only to installations
with a domestic hot water tank.
—
The 'space heating priority
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 out
door temperature equals or drops below the specified
■
[4-03]=1, then booster heater heater operation is only
space heating priority temperature, i.e. low outdoor temperature. In
determined by booster heater OFF temperature (T
BH OFF
),
booster heater ON temperature (T
BH ON
) and/or schedule
this case the domestic hot water will only be heated by the booster
heater.
timer. Refer to setting "[7-00]" on page 30 and "[7-01]" on
■
[5-
02] Space heating priority status: specifies whether space
page 30.
heating priority is enabled (1) or disabled (0).
■
[4-03]=2, then booster heater operation is only allowed if heat
■
[5-03] Space heating priority temperature: outdoor
pump is out of "operation range" of heat pump domestic
temperature below which the domestic hot water will be
water heating mode (T
A
<[5-03] or T
A
>95°F(35°C)) or
heated by the booster heater only, i.e. low outdoor
domestic hot water temperature is 3.6°F (2°C) lower then the
temperature.
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
If the booster heater operation is limited ([4-03]=0)
[5-03] on page 28, [6-00] on page 29 and [6-01] on page 29).
and the ambient outdoor temperature
T
A
is lower than
Results in the most optimum coverage of domestic hot water
the field setting to which parameter [5-03] is set and
heated by the pump.
[5-02]=1, then the domestic hot water will not be
■
[4-03]=3, then booster heater operation is the same as
heated.
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
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 33).
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.
Installation manual
EDLQ036~054B EBLQ036~054BA6VJU1
28
Unit for air to water heat pump system
4PW56182-1
