Weil-McLain GV90+ Installation And Start-Up Manual page 14

GV90+ Series 2
OAs-t'IRED WATER BOILER -
Boiler ManuaJ
Install water piping
(cononuedJ
Figure 14 Piping to single-zone system using diaphragm· or
bladdllf•lype
expansion tank. Boiloc connections are
1" NPT (suppty from 1"tee, return to 1"' recuperator
Figure 15 Piping
closed-type
expansion lank
®
t
NOnCE
Pipe diaphragm- or bladder·l)'peexpansion rank.s to the bot·
tom of the separator.
NOnC E
Pipe dosed-type (air in contact with water) tank.s to the top of
theairseparator . Alv.ays connect the fill line to the expansion
tank IOC'<ltion, as shown abcwe and in the suggested pipingl
t4
Legen d
1 Rtlief vah·e discharge piping -
stt-
page t 2
2 Isolation \<al\'d
3 FiJI valve
4 Diaphragm-type txpanston tank- always locate as
shown in the s uggesttd piping drawings in this manual
5 Air separato r
provide with automatic air w nr ONL Y when used
with diaphrngm-typt expansion ranks
pipe air oudet to expansion rank when used
with
dOS<-I)'pe UUlk.s
8 Cold Jill line.With .bac~owpteventerilr
Check valve
wb,.. rtquited by
c<ld••t<et Figute
15 foi
typioil cOm-
pi\lll'lit~)
7 S'r•l=
.u~plypiuin$
8
$ys\o:m n;wro piping
10 PfclsWe i'edllcing valVe
1
wh.m
USc~
11 Quk-k>Jill b)'lll>ss valve, w bel) used
12.
CIU<M-cyl"'
E'ltj>I'>Ml6o ranlt- alwoys
!o.:a~e
o.<
Slwwu
ill the
:~uggesctd
piphl8 d.rawiqp iu
thi5
manual
13 Tank
fittlng