Weil-McLain GV90+ Installation And Start-Up Manual page 19

GV90+ Series 2
oAs·FIRED WATER BOILER -
BaUer Manual
Install water piping
(continued)
Singl e-zone rad'-11 healing or heal pump
Radianr heating systems and heat pump systems usuaHy require.
system supply war:er temperatures below 1400F. But the boiler Ol,it.leL
water
temperarure will
be at least ISOOF to 1600F during most opt.rot-
ing conditions.
So
the piping must indude a method of rMudng the-
supply water temperature to rhe system.
Figure 22 uses
two
' b alancing valves lO manually adjust rht supply Wiiltr-
rtmperaturt.
Follow
the instructions
~low
to adjust these valvts. huuU
the suppt)• temperature limit control (irtm 14) as shown to protect
tht-
system from over-temperature conditions. Nore also that this piping
requires a separate system circulator, as shown> because of the hjghn-
flow rates of radlant and beat pump systems.
Manual adjustment of the supply
temperatu~
is limited to single-
zone systems because multi-zone sysrems will cause varying
!(load$.,
making it unlikely an acceprable valve setting could
be
found. See-
Figure 23, page 20 or Figure 24, page 20 for multi-1.one systems.
You may also apply the suggested piping of eir.her Figure 23> page 20
or-
Figure 24, page 20
if
you wanr auromatic suppl)• temptralure regulation
or outdoor reset remptraturt control.
For additional information and altemativts in piping for radiant hc:at-
ingsystems> con
tad.
\Veil-Mclain.
J
/IOTICE
1
Tho system circulator
,...,t
bo supplied
by
tho In·
stall«.
Adjust balan c ing v alves
Use \•alves 17 and. 18 to mix boiler supply water with system return
water, reducing su.pply warer temperarure ro the sysrem.
I. Subrract the design
system
supply rempe:rature from 150°F. CaU
rhis
number rbe temperature dtffennce.
2. Open valv< 17 and do,. val\·< 18.
3. Starr
the boiler
and
system.
4. Let
the
sysrem warm up f'o r about
15
minutes.
5.
Note the
temperature ar gauge 9 (sysrem supply) and gauge 8
(boiler supply).
6. Slowly dose \-alve 17 while opening \•alvt 18
unrll gauge
9 1't'"Jd!
tower than gauge 8 by ar least the temperature dtfferenc• fOund
in
~t<p
I.
1. Example: For a design supply
temperatu~
of 1 00°f, r.he tempera-
ture dtfferenc.e
woUld be ISOOF minus
IOOOF. or SOOF. Set the vn.J\ftl
until gauge
9
reads at least SOOF lower than gauge
8.
Part number 550-1+2-783/1012
Figure 22 Sing!e.·zona
radi~t
heating or
heat PU II\P systom
"' ot'
jo
a ""' .,-,
"
01/90+
"'""
Lege11d
1 Isolation T&h'el.
2 A ·utomaric air
vrnt twilh
diapfU'BJPll· fl'F't apauSioll
tank.),
or oonnecuo
tank ,fitting (dosed-type
. e :xpan ·
s.ioncankl~
I
3
~i.ap.h.rayn·
or bladthec-typt:
exF*~.Oo
t¢k
1
i.(l.!Sed
(F'or d asti! ·t)~expan·sion
tank.
pi p ¢ fm.rn
topofilir
sep~.mtorto
tarik
6ttingasiittf.lgurt
15~
pagt 14.)
5 S)?tt:m cirtu:b.tor
7 HnSt" bibb purg.e:Ya.h-e
fl
IRHierr ~e(te:mpc-rarure gauge-
~
Systt:m
supPl~
teru pen1twl! g:.uge
10
R~tu.rn. rem pt:rof\l.fepu~
14 ~ Upplyfempt:ramr~
Umitconttoi-Sd:'!lt'9
U!mpe:ra-
turtbtklw
t h¢
maximum
'Ill~
for the
'Ylll<!'m
or
Ill
directed by the-n•sttm Wig:ner.
16 Coldwar;er 6Uline - seefigure
ts~pagelA
forrypfcal
compa.n~nn
17 Ril..lando_g vai"Vt>.
'!
S.l""""g""' ="' !:.----------.!
19