Trane GRAA, Installation, Operation And Maintenance Manual

Page: 21 / 48

MUA-SVX004B-EN 21
Gas Connections
All gas piping should be installed in accordance with local codes. It is required that a ground
union be installed adjacent to the manifold for easy servicing. On vertical runs, a drip leg should
be provided upstream of the control manifold (See
Figure 11, p. 22 ). An additional shut-off must
be located externally of the jacket enclosure where required by local code. The location of this
valve must comply with the local codes. A 1/8 inch NPT plugged tapping, accessible for test
gauge connection, must be installed immediately upstream of the gas supply connection to the
unit. Field gas piping recommendations are shown in
Figure 12, p. 22 .
W WA AR RN NIIN NG G
E Ex xp pllo ossiio on n H Ha azza arrd d!!
F Fa aiillu urre e tto o ffo ollllo ow w ssa affe e lle ea akk tte esstt p prro occe ed du urre ess b be ello ow w cco ou ulld d rre essu ulltt iin n d de ea atth h o orr sse erriio ou uss iin njju urry y o orr
e eq qu uiip pm me en ntt o orr p prro op pe errtty y--o on nlly y--d da am ma ag ge e..
N Ne ev ve err u usse e a an n o op pe en n fflla am me e tto o d de ette ecctt g ga ass lle ea akkss.. U Usse e a a lle ea akk tte esstt sso ollu uttiio on n ffo orr lle ea akk tte essttiin ng g..
It is recommended that the gas piping not be installed through the bottom of the duct furnace
bottom panel. If piping must penetrate the duct furnace bottom panel, it must be sealed to
prevent water leakage.
W WA AR RN NIIN NG G
F Fiirre e H Ha azza arrd d!!
F Fa aiillu urre e tto o ffo ollllo ow w iin nssttrru uccttiio on nss b be ello ow w cco ou ulld d rre essu ulltt iin n d da am ma ag ge e tto o tth he e u un niitt g ga ass v va allv ve e a an nd d
cca au usse e a a ffiirre e h ha azza arrd d w wh hiicch h cco ou ulld d rre essu ulltt iin n d de ea atth h o orr sse erriio ou uss iin njju urry y..
•• D Do o N NO OT T cco on nn ne ecctt g ga ass p piip piin ng g tto o tth hiiss u un niitt u un nttiill a a ssu up pp plly y lliin ne e p prre essssu urre e// lle ea akk tte esstt h ha ass
b be ee en n cco om mp plle ette ed d..
•• D Do o N NO OT T rre elly y o on n a a g ga ass ssh hu utto offff v va allv ve e tto o iisso olla atte e tth he e u un niitt w wh hiille e cco on nd du uccttiin ng g g ga ass
p prre essssu urre e//lle ea akk tte essttss.. T Th he esse e v va allv ve ess m ma ay y n no ott b be e cco om mp plle ette elly y ssh hu utto offff,, e ex xp po ossiin ng g tth he e u un niitt
g ga ass v va allv ve e tto o e ex xcce essssiiv ve e p prre essssu urre e..
•• D Do o n no ott o ov ve err--ttiig gh htte en n tth he e iin nlle ett g ga ass p piip piin ng g a att u un niitt g ga ass v va allv ve e..
• The gas line should be supported so that no strain is placed on the unit. Pipe compounds
which are not soluble to liquid petroleum gases should be used on threaded joints.
• The appliance and its individual shutoff valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressure in excess of 1/2 psig
(3.5 kPa).
• The appliance must be isolated from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of the gas supply piping system at test
pressure equal to or less than 1/2 psig (3.5 kPa).
N No otte e:: For additional piping information, refer to the latest edition of the National Fuel Gas Code
ANSI Z233.1 (NFPA 54).