1701ULSA(EC)--EN, p. 16/30
Proper
combustion
air
supply
for
a
power
vented
type
B
installation
requires
ventilation
of
the
heated
space.
Natural
infiltration
of
air
may
not
be
adequate.
Use
of
exhaust
fans
aggravates
this
situation.
It
is
important
to
ensure
that
there
is
adequate
combustion
air
supply
at
all
times.
Reliance
on
doors
and
windows
is
not
permitted.
Always
ensure
that
en
adequate
inlet
for
fresh
air
for
combustion
is
provided
sized
to
suit
the
total
installation
of
any
combustion
apparatus.
8
CONDENSATION
DRAIN
PIPE
CONNECTIONS
All
ULSA/ULSA
EC
units
are
designed
with
a
built
‐
in
siphon
(PN
70
61761)
(figure
9).
Attention
:
in
case
replacement
of
siphon
is
necessary,
ensure
that
siphon
is
correctly
installed.
(see
figure
10).
Figure
9
Figure
10
It
is
recommended
to
use
a
PVC
discharge
pipe.
The
condensation
connection
between
the
air
heater
and
the
siphon
has
a
32
mm
diameter
and
must
be
glued
(leak
proof)
onto
the
siphon
inlet.
To
ensure
the
condensation
water
does
not
freeze,
it
is
recommended
to
mount
the
drain
pipe
inside
the
building.
If
there
is
no
other
choice
but
mounting
it
outside,
it
is
strongly
recommended
to
equip
it
with
frost
proof
insulation.
When
connecting
the
siphon,
it
is
necessary
to
use
sealing
rings
(in
the
siphon
outlet).
Ensure
these
sealing
rings
are
correctly
mounted.
Condensation
drain
pipe
connections
must
be
glued,
to
prevent
condensation
water
dripping
from
the
drain
pipe.
If
you
want
to
open
the
siphon
(e.g.
to
clean
it),
the
air
heater
must
be
shut
down.
For
security
reasons
it
is
recommended
to
wear
gloves
when
cleaning
the
siphon.
The
siphon
has
to
be
cleaned
yearly
and
also
checked
for
metal
sludge.
In
the
event
that
there
is
a
lot
of
metal
sludge
present,
the
air
heater
must
be
serviced
more
frequently.
The
condensation
water
coming
from
the
air
heater
has
a
pH
‐
level
of
approx
4.6
and
can
affect
materials
made
from
zinc
and/or
copper.
Hence,
it
is
strongly
advised
against
letting
the
condensation
water
flow
off
through
the
gutter.
Condensation
water
does
not
belong
in
a
rain
‐
water
tank
!
Downstream
from
the
traps
the
condensate
drains
may
be
joined
and
both
must
be
connected
to
a
sanitary
drain
within
the
building.
Check
codes
to
be
certain
that
this
is
permitted
(condensate
from
the
heater
has
about
the
acidity
of
soda
pop
and
is
not
harmful
to
a
sanitary
drain).
ULSA/ULSA
EC
heaters
will
produce
condensate
depending
on
size
and
gas
type
(see
table
3).
A
condensate
disposal
system
that
relies
on
gravity
should
be
satisfactory
for
most
installations
since
unit
heaters
are
normally
installed
several
metres
above
the
floor.
If
a
gravity
system
is
not
possible,
a
condensate
pump
must
be
installed.
There
are
a
number
of
commercially
available
pumps
made
for
this
purpose.
If
using
a
condensate
pump,
follow
the
pump
manufacturer’s
installation
recommendations.
Table
3
:
Condense
drain
rates
of
flow
ULSA/ULSA EC
025
035
050
075
100
Natural gas/
Propane
l/h
1,2
1,3
1,8
2,1
3,7
