0 EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1A – 09.2010
Installation manual
33
■
[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 34 and "[7-01]" on
page 35.
■
[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
>35°C) or domestic hot
water temperature is 2°C lower then the heat pump OFF
temperature (T
HP OFF
) for domestic hot water mode
(T
DHW
>T
HP OFF
–2°C). (Refer to setting [5-03] on page 33,
[6-00] on page 34 and [6-01] on page 34).
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].
■
[4-04]
Freeze
protection
function: avoids freezing of the
water piping between home and unit. In case of low ambient
temperatures it will activate the pump and in case of low
water temperatures it will additionally activate the backup
heater.
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.
[5] Equilibrium temperature and space heating priority
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 function is enabled (1) or
disabled (0).
■
[5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
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 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 heating priority temperature: outdoor
temperature below which the domestic hot water will be
heated by the booster heater only, i.e. low outdoor
temperature.
■
[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.
NOTICE
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 34.
NOTICE
■
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 37).
■
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.
NOTICE
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.
T
set
Domestic hot water set point temperature
T
U
User set point (as set on the user interface)
T
A
Ambient (outdoor) temperature
Space heating priority
T
A
T
set
T
U
[5-03]
[5-04]
4PW64602-1A.book Page 33 Thursday, September 23, 2010 10:40 AM
