Gas Connections - Trane GRAA Installation, Operation And Maintenance Manual

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
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
E E x x p p l l o o s s i i o o n n H H a a z z a a r r d d ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w s s a a f f e e l l e e a a k k t t e e s s t t p p r r o o c c e e d d u u r r e e s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y o o r r
e e q q u u i i p p m m e e n n t t o o r r p p r r o o p p e e r r t t y y - - o o n n l l y y - - d d a a m m a a g g e e . .
N N e e v v e e r r u u s s e e a a n n o o p p e e n n f f l l a a m m e e t t o o d d e e t t e e c c t t g g a a s s l l e e a a k k s s . . U U s s e e a a l l e e a a k k t t e e s s t t s s o o l l u u t t i i o o n n f f o o r r l l e e a a k k t t e e s s t t i i n n g 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.
F F i i r r e e H H a a z z a a r r d d ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n d d a a m m a a g g e e t t o o t t h h e e u u n n i i t t g g a a s s v v a a l l v v e e a a n n d d
c c a a u u s s e e a a f f i i r r e e h h a a z z a a r r d d w w h h i i c c h h c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .
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N N o o t t e e : : For additional piping information, refer to the latest edition of the National Fuel Gas Code
MUA-SVX004B-EN
D D o o N N O O T T c c o o n n n n e e c c t t g g a a s s p p i i p p i i n n g g t t o o t t h h i i s s u u n n i i t t u u n n t t i i l l a a s s u u p p p p l l y y l l i i n n e e p p r r e e s s s s u u r r e e / / l l e e a a k k t t e e s s t t h h a a s s
b b e e e e n n c c o o m m p p l l e e t t e e d d . .
D D o o N N O O T T r r e e l l y y o o n n a a g g a a s s s s h h u u t t o o f f f f v v a a l l v v e e t t o o i i s s o o l l a a t t e e t t h h e e u u n n i i t t w w h h i i l l e e c c o o n n d d u u c c t t i i n n g g g g a a s s
p p r r e e s s s s u u r r e e / / l l e e a a k k t t e e s s t t s s . . T T h h e e s s e e v v a a l l v v e e s s m m a a y y n n o o t t b b e e c c o o m m p p l l e e t t e e l l y y s s h h u u t t o o f f f f , , e e x x p p o o s s i i n n g g t t h h e e u u n n i i t t
g g a a s s v v a a l l v v e e t t o o e e x x c c e e s s s s i i v v e e p p r r e e s s s s u u r r e e . .
D D o o n n o o t t o o v v e e r r - - t t i i g g h h t t e e n n t t h h e e i i n n l l e e t t g g a a s s p p i i p p i i n n g g a a t t u u n n i i t t g g a a s s v v a a l l v v e 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).
ANSI Z233.1 (NFPA 54).
Figure 11, p. 22). An additional shut-off must
Figure 12, p.
W W A A R R N N I I N N G G
W W A A R R N N I I N N G G
22.
21