Trane Voyager Commercial, Installation, Operation And Maintenance Manual, Page: 40 / 156

40 RT-SVX34R-EN
Installation Piping
General Requirements
W WA AR RN NIIN NG G
H Ha azza arrd do ou uss G Ga asse ess a an nd d F Flla am mm ma ab blle e
V Va ap po orrss!!
F Fa aiillu urre e tto o o ob bsse errv ve e tth he e ffo ollllo ow wiin ng g iin nssttrru uccttiio on nss cco ou ulld d
rre essu ulltt iin n e ex xp po ossu urre e tto o h ha azza arrd do ou uss g ga asse ess,, ffu ue ell
ssu ub bsstta an ncce ess,, o orr ssu ub bsstta an ncce ess ffrro om m iin ncco om mp plle ette e
cco om mb bu ussttiio on n,, 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.. T Th he e sstta atte e o off C Ca alliiffo orrn niia a h ha ass d de ette errm miin ne ed d tth ha att
tth he esse e ssu ub bsstta an ncce ess m ma ay y cca au usse e cca an ncce err,, b biirrtth h d de effe eccttss,,
o orr o otth he err rre ep prro od du uccttiiv ve e h ha arrm m..
IIm mp prro op pe err iin nsstta alllla attiio on n,, a ad djju ussttm me en ntt,, a alltte erra attiio on n,,
sse errv viicce e o orr u usse e o off tth hiiss p prro od du ucctt cco ou ulld d cca au usse e
fflla am mm ma ab blle e m miix xttu urre ess o orr lle ea ad d tto o e ex xcce essssiiv ve e cca arrb bo on n
m mo on no ox xiid de e.. T To o a av vo oiid d h ha azza arrd do ou uss g ga asse ess a an nd d
fflla am mm ma ab blle e v va ap po orrss ffo ollllo ow w p prro op pe err iin nsstta alllla attiio on n a an nd d
sse ettu up p o off tth hiiss p prro od du ucctt a an nd d a allll w wa arrn niin ng gss a ass p prro ov viid de ed d
iin n tth hiiss m ma an nu ua all..
All internal gas piping for YC* rooftop units are factory
installed and leak tested. Once the unit is set into place,
a gas supply line must be field installed and connected
to the gas train located inside the gas heat
compartment.
Access holes are provided on the unit as shown in
Figure 12, p. 19 to accommodate side panel entry.
Following the guidelines listed below will enhance both
the installation and operation of the furnace.
N No otte e:: In the absence of local codes, the installation
must conform with the American National
Standard Z223.1a of the National Fuel Gas Code,
(latest edition).
1. To assure sufficient gas pressure at the unit, use to
determine the appropriate gas pipe size for the
heating capacity listed on the unit's nameplate.
If a gas line already exists, verify that it is sized
large enough () to handle the additional furnace
capacity.
2. Take all branch piping from any main gas line from
the top at 90 degrees or side at 45 degrees to
prevent moisture from being drawn in with the gas.
3. Ensure that all piping connections are adequately
coated with joint sealant and properly tightened.
Use a piping compound that is resistant to liquid
petroleum gases.
4. Provide a drip leg near the unit.
N NO OT TIIC CE E
G Ga ass V Va allv ve e D Da am ma ag ge e!!
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
g ga ass v va allv ve e d da am ma ag ge e ffrro om m iin ncco orrrre ecctt g ga ass p prre essssu urre ess,,
iirrrre eg gu ulla arr p pu ullssa attiin ng g fflla am me e p pa atttte errn nss,, b bu urrn ne err rru um mb blle e,,
a an nd d p po otte en nttiia all fflla am me e o ou utta ag ge ess..
U Usse e a a p prre essssu urre e rre eg gu ulla atto orr tto o p prro op pe errlly y rre eg gu ulla atte e g ga ass
p prre essssu urre e.. D DO O N NO OT T o ov ve errssiizze e tth he e rre eg gu ulla atto orr..
5. Install a pressure regulator at the unit that is
adequate to maintain 6" w.c. for natural gas and 11"
w.c. for LP gas while the unit is operating in the
“High Heat” mode. A minimum inlet gas pressure
of 2.5" w.c. for natural gas and 8" w.c. for LP gas is
required while operating in the “High Heat” mode.
N No otte e:: Gas pressure in excess of 14" w.c. or 0.5 psig
will damage the gas train.
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..
6. Leak test the gas supply line using a soap-and-
water solution or equivalent before connecting it to
the gas train.
7. Pressure test the supply line before connecting it to
the unit to prevent possible gas valve damage and
the unsafe operating conditions that will result.
N No otte e:: Do not rely on gas train shutoff valves to
isolate the unit while conducting gas
pressure/leak test. These valves are not
designed to withstand pressures in excess of
14" w.c. or 0.5 psig.
Connecting the Gas Supply Line
to the Furnace Gas Train
Follow the steps below to complete the installation
between the supply gas line and the furnace. Refer to
Figure 35, p. 41 for the Gas Train configuration.
1. Connect the supply gas piping using a “ground-
joint” type union to the furnace gas train and check
for leaks.
2. Provide adequate support for the field installed gas
piping to avoid stressing the gas train and controls.
3. Adjust the inlet supply gas pressure to the
recommended 6" for natural gas or 11" w.c. for LP
gas.