Water Ch Iller Systems - Weil-McLain GV90+ Installation And Start-Up Manual

GV90+ Series 2
oAs·FIRED WATER BOILER -
Boiler ManuaJ
Install water piping
rconunuedJ
Wa t er c h iller s ys t e m s
Pipe
the boiler
and water chiller as shown in Figure 2?.
Install boiler, as shown> so chilled medium is piped in parallel with
heating boiler.
Use appropriate \•atves to prto\'fnt chilled medium from entering boiler.
See
Figur< 27 for typical installAtion of balancing vah" and check vruvt>
Install the flow/c.bec. k
' ' 3 1'"
in the boiler supply piping, as shown
in
Figure 27) to prevenr gravity circulation during the cooling cycle.
If boiler is
connected to
heating coiJs located in air handling units where
they can be exposed to refrigerated
air,
use flow c-Ontrol \..Uve.s or other
automatic mellllS ro pr.e\rent gra\rity circulation during cooling cycle.
NOnCE
NOnCE
NOnCE
NOTICE
22
Balancing, when 111qulrad - Subsriture a
memory-srop
\'lllve fo r one of the isolation valves in each 1.0ne
to
us~
the memory-stop \'alve for balandng flow as well as
isolation.
Zoning
wtth
zone valves - Provide a separate 24-volt
transformer
to
power the
zone valves. Size the
trans~
forme. r to handle
the
total rated load of all
connected
zone vahoes. Alte. r nati,-eJy, use a zone valve zone ron troller.
Do not u:se
R & C
eonnecUons for zone vatve.
Zoning with circulators - The GV90+ internal system
circulator cannot
be removed from the
boiler fo r use as
one of the
z.one
circulatorS. It must rtmain
as
shipped
from the factory to allow proper flow control inside the
boiler. Yo-u will need a circuJator fo r each z.one. PrO\ride
circulator relays or circulator zone controller.
Chilled water
systems
ofren use dosed-type expansion
ranks, as s hown in Figure 27. 00 NOT install automatic
air vents ()n
rhese systems.
Figure 27 Installing GV90+ boiler in
syslam with
water
cliill~K
' 7
~ •
~
~ .
@
~
(!)
4ij
0 Q
e::>
il
rJj
Q
asou
Legend
Lsolatlon vatves
2 Air separator
3 E.xp&Mion tank with tank fitting (piping shown for
application
of
a closed-type expansion tank)
5 System circulator
6
Flowlcbeck
valve
8 Boiler pressureltemperatwe gauge
16 Coldwater 6Uline- see Figure 15,page
1 4
for typical
components
17 Balancing val\>e
19 OliUer
20
Strainer
21 Oleck valve
22 System supply
23 System
return
Pan
number
550-142-783/1012