Instructions
DH-SMT/PL
VI.KR.Z1.02 ©
Danfoss 09/2006
7
Akva Vita TDP-F - district heating flat station for direct HE and DHW
Thermostatic by-pass (optional)
As an option the flat station can be equipped
with a by-pass thermostat, Danfoss FJVR, which
ensures that hot water is available immediately
when tapping starts. It is recommended to set the
thermostat in pos. 3.
If the water temperature rises too slowly it can be
necessary to set the thermostat at higher value,
however, not higher than in position 4.
DHW circulation (optional)
As an option the flat station can be equipped with
connection pipe for circulation with adjustable
setting of DHW circulation. If the Akva Vita TDP-F
flat station is connected to the circulation system
in the building, the thermostat will control the
circulation water temperature. This ensures that
hot water is available at the tap point without any
waiting time and water waste. It is recommended
to set the thermostat in pos. 2-2,5. If the circulation
pump is switched off, the thermostat should be
closed. In case the Akva Vita TDP-F flat station has
been delivered with by-pass control and this must
be changed to DHW circulation, this can be done
by performing control change from by-pass to
circulation, as described on page 3.
Approximate thermostat scale setting:
I = 10 °C
1 = 20 °C
2 = 30 °C
3 = 40 °C
4 = 45 °C
I = 50 °C (max. temp.)
5. Filters
Filters should frequently be cleaned from sediments
by authorized personnel, according to producer’s
instructions and depending on the flat station’s
operating conditions.
Maintenance
It is necessary to check and maintain the flat
station on a regular basis in order to keep it in
good operating condition.
The frequency of the maintenance and service
inspections should be according to system
manufacturer specifications and local legislation.
However, maintenance inspections should take
place at least twice each year (before and after the
heating season).
In addition to the check of the flat station as to its
functionality, it is also recommended to check if the
following system parameters are compliant with
the requirements of the system manufacturer and
local regulations:
- no leakages,
- correct temperatures in the distribution
network,
- stable district heating supply and return
temperatures,
- correct cooling of the district heating supply,
- DHW temperature (requested temperature
should be in accordance with the local
regulations),
- pressure drops in filtering and water
conditioning plants (filters, sludgers etc.),
- pressure drops in the heat exchanger (primary
and secondary side of heat exchanger).
The flat station operator should consider the above
parameters and prepare written maintenance
reports.
Service inspections by authorized personnel
are usually more precise (complex) than user
maintenance inspections and the intervals between
them are longer.
