Slant/Fin VSL-160B Installation Instructions Manual page 63

12 - START-UP
CAUTION!!!
The addition of any
chemical substances, such as
anti-freeze, must be carried
out according to the product
instructions.
To fi ll the heating system, proceed as
follows:
1. open the automatic air vent, shown
as item "1" in Figure 3-1, two turns;
2. open the fi ll valve located under the
boiler and proceed to fi ll the heating
system and boiler until the pressure
gauge, item "13" in Figure 13-1,
reads 20 psi (1.5 bar) and "FILL"
disappears from the display;
3. check that there is no water leaking
from the fi ttings. If there is, the
leaks must be eliminated;
4. close the fi ll valve;
5. check the pressure gauge during
the purging process. If the pressure
has dropped, re-open the fi ll valve
to bring the pressure back up to 20
psi (1.5 bar).
12.1.4 - Filling the
domestic hot water heat
exchanger (160-C model
only)
Once the heating system has been
fi lled and purged, the domestic hot
water heat exchanger must be fi lled
as follows:
1. connect a rubber tube to the air
purging cock "A" shown in Figure
12-2 and place the end in an empty
bucket or sink;
2. open the cock "A" shown in
Figure 12-2 until air can be heard
escaping;
3. once the water runs clear of air
bubbles close the cock "A" shown
in Figure 12-2;
4. remove the tube and check that
there are no water leaks.
63
12.1.5 – Auto-purging the
heating system
Each time the on/off power switch,
item "12" in Figure 13-1, is switched
on, an auto-purging cycle lasting 3
minutes begins. The auto-purging
process involves the turning the pump
on and off in order to remove any air
trapped in the heating system. Before
starting the auto-purging cycle the
automatic air vent, item "1" shown in
Figure 3-1 must be opened.
12.1.6 – Delay to light-on
Each time the on/off power switch,
item "12" in Figure 13-1, is switched
on, a delay timing sequence of 3
minutes begin.