Installation manual
35
E(D/B)(H/L)Q011~016BB
Unit for air to water heat pump system
4PW67904-1 – 01.2011
■
[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
"[6-03]" on page 37
and
"[6-05]" on page 37
.
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
■
[4-02] Space heating off temperature: outdoor temperature
above which space heating is turned off to avoid overheating.
■
[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 unit malfunctions.
■
[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.
Freeze protection function
■
[4-04] Freeze protection function. This function avoids
freezing of the (outside) water piping between the house and
the unit. In case of low ambient temperatures, it will activate
the pump/backup heater. The default freeze protection
function takes into account freezing of insufficiently insulated
water piping. Basically it means that the pump is activated
whenever ambient temperatures become close to freezing,
independently of the working temperature.
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
"[C-02]" on page 41
).
■
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 unit. The required corrective
action is described in
"Symptom 8: [4-03] and
maximum tank set point is not according to the the
applicable tank" on page 52
.
INFORMATION
[4-03]=3 (default), this setting is automatically
selected if the correct and complete wiring
connections between 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 unit
cannot work due to malfunction, the backup
heater will also be allowed to operate during
space heating.
■
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.
