Slant/Fin VSL-160C Part A - Manuel (Page 20)

20
7.2.3 - Expansion Tank
and Makeup Water
Boiler model 160-C is factory
equipped with its expansion tank with
2 gals volume. Ensure this volume
is suffi cient for the heating system
you are designing. If not, install an
additional external expansion tank.
For boiler model 160-B, ensure the
expansion tank is properly sized
for the boiler volume (1,5 gallons
[6 litres]) and the system volume,
temperature and pressure.
CAUTION!!!
Undersized
expansion tanks will cause
system water to be lost
through the pressure relief
valve and cause additional
makeup water to be added to
the system. Eventual boiler
heat exchanger failure can
result due to this excessive
makeup water addition,
compromising the functionality
of the unit and void its
warranty.
For model 160-B (and for 160-C if
needed), the expansion tank must
be located as shown in Figures
7-6 and 7-7 when using a primary/
secondary piping arrangement or as
per recognized design methods. Refer
to the expansion tank manufacturer
instructions for additional installation
details.
Connect the expansion tank to an air
separator only if the air separator is
located on the suction side (inlet) of
the system circulator.
Always locate and install the system
fi ll connection at the same location as
the expansion tank connection to the
system.
7.2.4 - Heating pump
160-C boiler is fi tted with a circulator
pump. The head available to supply
fl ow through the heating system at the
boiler connections is shown in graph
form in Figure 7-3. The internal pump
is suffi cient to run the water into the
primary looping.
CAUTION!!!
It is up to the
installer to ensure the minimum
system fl ow is not less than 5
GPM at any time.
To connect a system pump on the
secondary looping see Figure 7-6 and
electrically connect the pump follow
Figure 8-2
160-B boiler is not fi tted with an
internal pump. The installer needs
to install an external heating pump
as illustrated in Figure 7-7. To size
the pump, together the system head
loss, consider also the graph in Figure
7-4. The minimum allowable fl ow rate
through the boiler is 5 gpm (1,135 l/h).
CAUTION!!!
It is up to the
installer to ensure the minimum
system fl ow is not less than 5
GPM at any time.
To wire the heating pump to the boiler,
refer to Section 9.1. Because the
pump is normally used in conjunction
with an indirect water heater, see
Figure 7-7 which shows a typical
installation with a typical rise of 35°F
and using the follow heating pump:
- GRUNDFOS model UPS15-58FC
- TACO model 008/0010
- B&G model NRF-36
- Armstrong model Astro 30
For different installations, size the
pump using recognized design
methods.
7.2.5 - Sizing heating
system
Size the piping and system
components required in the space
heating system, using recognized
design methods.
7.2.6 - Domestic Hot
Water System Piping
when using an indirect
water heater
See Figure 7-7 , for recommended
piping to an indirect water heater. This
recommended piping confi guration
ensures priority is given to the
production and recovery of DHW.
Install the heating pump (item “9”,
Figure 7-7) only if you are using a
160-B boiler model. Refer to Figure
9-1 to wire the indirect water heater
pump, the system pump and the
heating pump (if present).
7 - INSTALLATION - Water connections
7.3 - Converting a
combi boiler into a
heating only boiler
If you are in possession of a combi boiler
(160-C) you can use it as a heat only
boiler without using the domestic hot
water circuit. To do so, simply plug the two
fi ttings, items “3” and “5” of Figure 6-2,
and move switch N°5 (see Figure 9-1)
from OFF position to ON position. Now
knob “11” of Figure 13-1 is disabled.