RHOSS UTNC-EV Instructions For Use Manual page 16

II.2.5.7 Functioning of the motorised electrothermal
valve
This 2- 3- way valve is of the OPEN/CLOSE type with ver y slow travel.
It is not a modulating val ve so it has no PTC.T his val ve is driven, as a
sensible element, by the ambient ther mostat of the "c assette" unit.
The 2- way val ve is nor mall y clos ed to the coil with no power ed actuator
side. The 3-way val ve is nor mall y clos ed to the coil with no powered
actuator side while is open to the bypass way side. When the room
temperature does not s atisfy the thermos tat, the valve opens after
about 3 minutes about to allow water to circul ate i n the c oil.
If the room temperatur e satisfi es the ther mostat or if the electric power
has been s witched off, the valve is clos ed after about 3 minutes towards
the c oil and is opened towards the bypass.
2
A
Val ve
Electrothermal head
1
Val ve body
2
In an em ergen cy, the valve can be opened m anually
by loosen ing the nut and removing the electric
actuator. On ce the emergency is resolved,
rememb er to restore the automatic function of the
valve b y re-positioning the electric actuator. Failure
to do so can cau se condensation due to the
passage of water, even if not po wer ed.
II.2.5.8 Instructions to be followed if valves
supplied by the installer are used
W ater connections
Use flat-end val ves with a 40 mm interaxis for sizes 26-41-51 and a 74
mm inter axis for sizes 61- 86-111.
Install the val ves following the manufactur er instructions; refer to the
relative figures for the c onnections to the unit.
Carefull y insul ate the pi pes, the val ve units and the coil fitti ngs (cold
water side) s o as to prevent the condens ation that c an form on them
from dripping on to the false c eiling.
When the s ys tem is filled with water, verify the tightness of all the
fittings.
RHOSS S.p.A. cannot guar antee tightness
efficiency of the valve units supplied b y the installer
as these are not factor y-tested. Th erefore, the
Company shall not be h eld liable for an y
malfunctioning valve unit and damage cau sed b y
dripping.
Electrical connections
Connect the room control following the instruc tions r elati ve to the
control used.
ATTENTION !
Route the cables through the electrical box as
shown in fig.
A
1
SECTION II: INST ALL ATION AND MAINTEN ANCE
Connect the val ves accordi ng to the following instruc tions, using the
relative wiring diagrams.
The type of valves used must cl ose the water i nlet to the unit in the
event of a power c ut.
2-position (ON-OFF) 230V valves for UTNC-EV
In this case the chilled water val ve must be piloted by the 230V ON-
OFF signal from clamp V, and the hot water val ve from clamp H.
2-position (ON-OFF) valves with a voltage other than 230V for
UTNC-EV
If a room control listed in the acc essories tabl e is us ed, follow the
instructions in the previous paragraph, installing two 230V relays to
clamps V-N and H-N that will control the valve opening.
1 Hot val ve or hot valve relay
2 Cold val ve or col d val ve relay
Control connection for UTNC-EV
If a l ow- voltage control is used or the room control ins talled is not
included in the acc essories tabl e, the c onnecti ons mus t be implemented
on the termi nal boar d of the unit.
ATTENTION !
Failure to comply with these connections can cause
the condensation water to overflow from the tray.
230V-1ph-50Hz
N L
IG
ON-OFF
TB
Y/G Y/G
1CF
4
1CM
FS
1
2LIV
3 5
C
32
1
UTNC-EV
COOL HEAT
PE N N L V H C LC V3 V2 V1
A A
1
F
2
G O A B B C W R
3CF
3 2 1 1 2 3 4 5
3CM
G O A B W R
B C
FS
1
1LIV
M
3 5
PS
C
CV
UTNC-EV
HOT Hot
COLD Cold
2
Y/G
6
Y/G