Installation manual
29
EKHBH/X016BB
Indoor unit for air to water heat pump system
4PW62572-1A – 01.2011
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[4-03]=4, then booster heater operation is the same as
setting 2, except that the domestic water heating (heat pump
and booster) will operate according to the scheduled storage
and reheat function. See field settings
and
Backup heater operation (only for EKHTS)
The operation of the backup heater can altogether be enabled,
disabled, or limited.
■
[4-00] Status: defines whether backup heater operation is
disabled (0), enabled (1) or limited (2).
When [4-00]=2, the backup heater is only allowed during
domestic water heating mode.
Space heating off temperature
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[4-02] Space heating off temperature: outdoor temperature
above which space heating is turned off to avoid overheating.
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[4-06] Backup heater emergency operation: defines whether
backup heater is allowed (1) or not allowed (0) during
emergency operation.
Emergency operation will startup backup heater operation
during certain outdoor malfunctions.
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[4-07] Backup heater second step: defines whether backup
heater second step is allowed (1) or not allowed (0).
In this way it is possible to limit the backup heater capacity.
[5]
Equilibrium temperature and space heating priority
temperature
Equilibrium temperature (only for EKHW*)
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).
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[5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
Space heating priority temperature (only for EKHW*)
Applies only to installations with a domestic hot water tank
(1)
. 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.
INFORMATION
■
When setting [4-03]=1/2/3/4, 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
).
■
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.
CAUTION
For optional domestic hot water tank, the field
setting [4-03] shall be 0, 1, 2, 3, or 4.
In case [4-03]=5, there is an incorrect field wiring
between tank and indoor unit. The required
corrective action is described in
and maximum tank set point is not according to the
applicable tank" on page 47
INFORMATION
[4-03]=3 (default), this setting is automatically
selected if the correct and complete wiring
connections between indoor unit and switch box
(a)
of the optional domestic hot water tank are done
BEFORE SS2-2 is set to ON. [4-03]=0~4 activate
the applicable logic and field settings for EKHW*.
(a) Only applicable for tank with built-in electrical booster heater
(EKHW*).
INFORMATION
For tank without electrical booster heater (EKHTS), the
backup heater will be used in domestic water heating
mode.
INFORMATION
■
In special conditions, for example the outdoor
cannot work due to malfunction, the backup
heater will also be allowed to operate during
space heating.
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If the backup heater operation is disabled
([4-00]=0), the domestic water will not be
heated.
CAUTION
For optional domestic hot water tank EKHTS, the
field setting [4-03] shall be 5.
[4-03]=5, this setting is automatically selected if the
EKHTS tank is connected and SS2-2 is set to ON.
[4-03]=5 activate the applicable logic and field
settings for EKHTS.
INFORMATION
■
Make sure that the domestic hot water set point is
according to your requirements.
Start with a low domestic hot water set point, and only
increase if you feel that the domestic hot water supply
temperature is not sufficient for your requirements
(this depends on your water using pattern).
■
Make sure the domestic water is not heated
unnecessary.
INFORMATION
Only for EKHTS: If the storage temperature set point
is higher than 50°C, Daikin advises not to disable the
backup heater second step because it will have a big
impact on the required time for the unit to heat up the
domestic hot water tank.
(1) Only applicable for tank with built-in electrical booster heater (EKHW*).
