Weil-McLain GV90+ Installation And Start-Up Manual page 20

GV90+ Series 2
oAs·FIRED WATER BOILER -
Boiler ManuaJ
Install water piping
rconunuedJ
Multi-zone ra d iant heating system
Multi-zone systems require auromatic regulation
of the syst~m
sup-
ply temperature becau.se of widely varying load conditions. Figure 2.3
(zone-\-alve roning) and Figure 24 ( circularor zoning) show suggestfil
piping for these sysrtms.
IAWARNJfGI Provide an automatic temperature control valve or
motor-Optr.ued
valve \vhich can be adjusred
fo r the
desired suppl)• water ttmptraturt . This
is
required tn
protect the radiant system from excessive temperarure.
Zone-valve zoning- The suggested piping uses a separate circulatot
for system circulation to provide the hlgher flow typical of radiant
heating
S)'Sttms
and
to
assure good temperature di.srriburion in the-
system when
the rtturn water temperature is
low.
Circul.aror zoning - The GV90+ internal circulatorS must not be-
remo,red. Provide a
separat~
circulatOr for each
7.0 n ~.
I
NOTICE
NOTICE
NOTICE
NOTICE
Baianclr).g,
when
*"'lnKI - Substitute a memory-stop
val\·~
for one of
the
isolation valves in each
z.one
ro usc
the
memory-stop
vah-e
for
balanc.ing
flow
as well as
isolarion_
Zoning wtth zon• valves - Provide a separate 24-voiL
transformer to power the zone
valves.
Size the trans-
former to handle the total rated load of all conne.:ted
zone
vahres.
Alternath<ely,
use
a 20ne
valve
20ne controller.
Do
not LIM R & C coi'WMtCdons for zone valvt.
Zoning wtth circulaton -
The
GV90+
internal sysrern
circulatOT cannot be removed from rhe boiler for
use
as
one of tbe zone circuJarors. lr must remain as shipped
from the factory to allow proper flow control
inside
the
boiler. You will
n~
a circularor for
~ach
zone.
Provide
circulatOT relays or circulator zone controller. The sys-
tem clrculalor must be supplltd
by the
Installer.
Outdoor reset
Apply Figure 23or Figure 24 for any
system
inrended forourdoor rtsel
of the supply water remperaturt. Use a motor-operated three-way vahre-
and an outdoor reset temperature control
system.
20
Legend
Lsolatfon vatves
2 Automatic air vent (with diaphragm-type
expansion
tank)~
or
connect to tank 6tting (dosoecf-type expansion
tank),
3 Diaphragm- or
bladder.rype
expansion tank.
if used
(For closed-
type expansion
tanlr.
pipefromto pofairseparatortotank fitting
as
in
Figure
l~pa~
14.)
4 Zone val\>e
5
System
or
zone
ci.rcuJator
6 Flowlcheck valve
7 Hose bibb purge
vah-e
8 Boiler pressurel temperarure gauge
9 System supply
temperature gauge
10
Supply
tempera tore
automatic
mixing
vaJ,-e
I I Differential
presswe
by-pass vatve
16 COld ,ater6Uline- see Figure
l~page
14fortyptcalcomponents
Figure 23
A~to
system "'1PPiY temp regulation -
zooo valva
ZOfltng
...
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OV90._
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Figure 24 Auto system supply temp reguiatiQO -
circulator zoning ...
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ZOn.G 2
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Pan number
5SO.I<t2-783110l2