Instructions for installation and use
Akva Lux II TDP RENO
© Danfoss | Produced by Danfoss Redan A/S | 2015.10 | 11
VI.JV.R1.02
Zone valve / thermal actuator TWA-A
The Akva Lux II TDP-F can be supplied with zone valve/thermal actu-
ator TWA-A, which enables connection to an
electronic program-
mable room thermostat.
The thermal actuator of the zone valve is switched on by an exter-
nal contact from the room thermostat, and starts to open or close
the valve. The actuating movement is achieved by means of an
electrically heated expansion element. When the heating current is
switched off, the actuator shuts or opens the valve.
The actuator is equipped with a visual position indicator to show
the open or closed position of the valve.
Electronic programmable room thermostat (option)
If the substation is connected to a room thermostat the tempera-
ture is controlled by the room thermostat and radiator thermostats.
Please note that the room thermostat keeps the temperature at a
constant level in the whole apartment according to the set room
parameters.
Consult additional maintenance instructions for room thermostat
for further information. It is recommended to avoid fully opened
thermostats on some radiators and fully shut-off on others. Higher
temperature at the top and lower temperature at the bottom part
of radiators means that the system operation is correct. To keep cor-
rect temperature and friendly microclimate for human beings in the
apartment, it is recommended to ensure regular airing in rooms.
Anti-water hammer membrane tank
The station is prepared for connection of an anti-water hammer
membrane tank, which is to be ordered separately.
The anti-water hammer membrane tank is a pressure equalizing tank,
which absorbs the volume changes of the hydraulic fluid between
the minimum and maximum temperature to keep us the pressure
largely constant.
If the system is heated, the anti-water hammer membrane tank
absorbs the expansion volume of the water. If system temperature
drops, the anti-water hammer membrane tank leads the expansion
water back into the system. The water pressure in the system remains
constant.
(Please note that the anti-water hammer tank is not included in the
delivery).
Thermal actuator TWA-V
Please note
: Some variants are
supplied with zone valve only, as
illustrated above, and therefore a
thermal actuator TWA-A must be
mounted on the zone valve be-
fore connection to an electronic
TWA-A
For Danfoss RA valves
TWA-V
For Danfoss RAV/VMT valves
TWA-L
For Danfoss RAVL valves
TWA-K
For Heimeier/MNG/Oventrop
valves with M30 × 1.5 connection,
generally as per attached drawing.
Other valves must be verified
individually to ensure correct
valve closing measurement and
valve top geometry.
TWA-D
For Danfoss RTD valves
088R0248
| 15.12.2005 |
Version 03
INSTRUCTIONS
TWA NC
VI.SB.H3.02 12-2005
Produced by Danfoss Industri Service 05.09 JJ-Bi.DS
*)
24 V Class II transformer (SELV)
**) 230 V max. 3 A pre-fuse
