SECTION II: INST ALL ATION AND MAINTEN ANCE
33
The val ves must onl y open when the f an is functioni ng, i.e. when one of
the cl amps V1, V2 or V3 is energized by LC mains suppl y.
Any el ectric heat er, which mus t onl y be of t he t ype installed in the
factor y, must onl y be powered when a f an is func tioni ng.
3
2
4
1
Y4 Y2
YX
L
L
N N PE
TB
A
O
B
G
1CM
1CF
1
3
5
PS
C
1
3
5
1LIV
2LIV
G
O
B
A
C
FS
FS
M
R
C
B
W
W
A
A
B
B
Y/G
Y/G
FILTER
L
N
PE
Y/G
1
2
3
4
5
PE
N
L
A+
A
-
X2
M2
X3
M1
RS232
230V-1ph-50Hz
L
N
IG
UTNC-I
HEAT
COOL
ON/OFF
0-10Vcc
HEATING INPUT SIGNAL (230Vac)
COOLING INPUT SIGNAL (230Vac)
II.2.5.9 Anti-freezing protection
IMPORTANT !
When the unit is out of servi ce, dr ain all the water
from the circu it.
IMPORTANT !
Mixing the wat er with gl ycol modifies the
performance of the unit. Pay attention to the safet y
instructions on the p ackage regard ing gl ycol.
If the unit is not used during the wint er period, t he water c ont ained in
the s ys tem may fr eeze. To prevent this, all the wat er contained in t he
circuit must be emptied before the onset of winter. However, if the
operation of draining t he s ystem s eems t oo laborious, a suit able
quantit y of anti-freez e liquid c an be mi xed with the wat er instead.
If the s yst em needs to be empti ed, remember t hat a water head always
remains int o the c oil and it may freez e in c ase temperat ure goes bel ow
0° t hus c ausing t he heat exchanger failur e. The heat exc hanger can be
totall y emptied by openi ng the val ves and bl owi ng in air in eac h val ve
for 90 sec onds at a mini mum press ure of 6 bar.
II.2.6
ELECTRICAL CONNECTIONS
IMPORTANT !
The el ectrical connection of the unit mu st be
carri ed out b y qualified p ersonnel , in complian ce
with the regulation s appli cabl e in the countr y wh ere
the unit is in stall ed. RHOSS S.p. A. shal l not be held
liable for damag e to per sons or prop ert y caused b y
a non-compliant electrical connection.
DANGER !
Al ways install a general automatic swit ch in a
protected ar ea n ear the machine, which h as a
characteri stic d elayed curve, sufficient capacit y and
breaking po wer. There must be a min imum dist ance
of 3 mm bet ween the contacts.
An earth connection is compulsor y b y law to
ensure u ser saf et y whil e the m achin e i s in u se.
Chec k t hat the volt age and the frequenc y of t he electrical s yst em
correspond t o 230V (±10%) single phas e at 50 Hz (±7% in c ase of units
with electric resi st anc e); that the available installed power is s ufficient
for running the equipment and t hat the suppl y c ables are of adequat e
section for t he maximum c urrent r equired.
Make sure that t he electrical s upply s ystem c omplies with c urrent
national s afet y regulati ons.
The connections must be impl emented in accordance wit h t he diagrams
supplied with the machi ne. Use a H05VV-F-type, flexibl e, double-
insulat ed, b earth c able wit h a 1. 5 mm² s ection to connec t the
unit t o t he mai ns (2, 5 mm² in case of elec trical heater).
IMPORTANT: the unit with the elec tric heater is equipped wit h t wo
thermost ats; one with aut omatic rearm and one wit h manual rearm that
can be reacti vat ed. Il riscaldatore elettrico è installato esclusi vamente in
fabbrica. E’ assolutamente vi etato l’us o suppl ement are di altri
riscaldatori montati i n loco. L’inosser vanza di ques ta norma c ausa il
danneggiament o dell’unità e c omport a l’immedi ato annullament o della
garanzia. The electric heat er is fac tor y inst alled. The us e of ot her
electric heat ers is abs olut ely prohibited. F ailure t o f ollow this s afet y
requirement causes unit damage and voids t he warrant y.
A
B
A
Thermostat wit h manual reset
B
Thermostat wit h aut omatic res et
1
1
1
2
3
4
5
6
7
UTNC-EV
1
Electrical box
2
Cable holder
3
Terminal bloc k
4
Electric heater rel ay
5
Capacit or
6
Fusible
7
Val ve c able inlet