If th
e
boiler i
s
not op
e
rated for severa
l
hour
s
during very cold
w
eather
t
h
e
r
e is
the
p
o
ss
ib
i
lity of th
e sys
t
em
f
reezing
.
Pl
e
a
s
e
e
n
su
re that if y
o
u
or
e
a
b
s
e
nt during a period
of
f
r
o
s
t t
he c
ent
r
al heat
i
ng system remain
s
in
ope
ra
tion and all raams a
re
kept
a
bo
ve
f
ree
Z
i
ng
p
oint
.
(It mu
s
t be
r
e
membered
,
h
o
w
ever
,
tha
t
th
e
boil
e
r
w
il
l
be au
t
omat
i
cally
sw
itched aff
by
the built-in monitoring device
s i
f
ce
rtain foult
s
occur
, e.
g
.
i
nter
r
uption
i
n t
h
e
ga
s
or el
e
ctricity
s
uppl
y
or faul
ts
in
t
he flue ga
s
-
system
. T
o
o
v
e
rc
om
e
thi
s
possibility you
c
an drain both th
e
c
e
nt
r
al h
e
ating
s
y
s
t
e
m
a
nd
t
he boile
r)
.
Clean the outer ca
s
ing with a dam
p
cloth and a litt
le soap
.
Do not use an
y
abr
a
s
i
ves or s
ol
ve
n
t
cl
e
a
n
in
g
m
a
t
e
ri
al which cou
l
d
d
amag
e
t
h
e
c
a
se
or p
l
a
s
ti
c
fi
t
ting
s.
It i
s
impartant that the boi
l
er i
s
serviced at
l
ea
s
t on
ce
a
year by a com
p
e
t
en
t
.
s
ervice company
.
To
e
n
s
ure regula
r s
e
rv
ic
ing it is strongly recommended
tha
t
.
ar
r
angement
s
are made with you
r se
rvi
c
e
a
g
en
t or
Va
i
llant l
t
d
.
for a
M
aintoinen
ce
Ag
r
eem
e
nt
.
Plea
s
e
ret
u
r
n
the re
g
istr
a
tion
card
i
f you would
li
k
e further detai
ls.
