MUA-SVX003B-EN
23
WWAARRNNIINNGG
PPrrooppeerr VVeennttiinngg RReeqquuiirreedd!!
FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonnss bbeellooww ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
AAllll vveennttiinngg iinnssttaallllaattiioonnss sshhaallll bbee iinn aaccccoorrddaannccee wwiitthh tthhee NNaattiioonnaall FFuueell GGaass CCooddee,, AANNSSII
ZZ222233..11 oorr aapppplliiccaabbllee pprroovviissiioonnss ooff llooccaall bbuuiillddiinngg ccooddeess..
VVeennttiinngg iiss aann iinntteeggrraall ppaarrtt ooff tthhee uunniitt aanndd mmuusstt NNOOTT bbee aalltteerreedd iinn tthhee ffiieelldd..
The Natural Vented units are equipped with a vent cap which is designed for natural draft
venting. Air for combustion enters the base of the vent cap through a protective grill and
products of combustion are discharged at the upper section of the vent cap. TThhiiss vveenntt ccaapp iiss
sshhiippppeedd iinn aa sseeppaarraattee ccaarrttoonn aanndd sshhoouulldd bbee iinnssttaalllleedd ppeerr tthhee VVeennttiinngg sseeccttiioonn ooff tthhee
OOuuttddoooorr RRooooffttoopp GGaass--FFiirreedd DDuucctt FFuurrnnaaccee IInnssttaallllaattiioonn aanndd SSeerrvviiccee MMaannuuaall..
The Power Vented unit has a induced draft venting system. The combustion air inlet and
products of combustion discharge louvers are located in the upper section of the Duct Furnace
side access panel. NNeevveerr llooccaattee tthheessee uunniittss iinn aann aarreeaa wwhheerree tthhee flfluuee pprroodduuccttss ddiisscchhaarrggee
oouuttlleett mmaayy bbee ddiirreecctteedd aatt aannyy ffrreesshh aaiirr vveennttss.. SSeeee tthhee OOuuttddoooorr RRooooffttoopp GGaass--FFiirreedd DDuucctt
FFuurrnnaaccee IInnssttaallllaattiioonn aanndd SSeerrvviiccee MMaannuuaall ffoorr iinnssttaallllaattiioonn aanndd sseerrvviicciinngg rreeqquuiirreemmeennttss..
Duct Connections
All ductwork must be properly supported so that no strain is put on the unit. Do not alter or bend
the discharge duct flanges supplied on your furnace/air handler.
Ducts connected to units which do not have either a blower section or a supply plenum must
have a removable access panel in the duct which is connected to a duct furnace. The duct
openings shall be accessible when the unit is installed in service, and shall be of such size that
smoke or reflected light may be observed inside the casing to indicate the presence of leaks in
the heating element. The covers for the panels shall be attached in such a manner as to prevent
leaks. Ducts exposed to the outdoors must be insulated and sealed to prevent water from
entering either the unit or building through the duct.
If a single, double or triple duct furnace only unit is connected to a return air duct, or any other
inlet air restriction, the appliance shall be installed on the positive pressure side of the air
circulating blower.
When connecting return air duct to Standard or High CFM cabinets, attach duct to return air
opening flange when no dampers are used. Otherwise, if dampers are used, attach return air duct
around collar at bottom of damper assembly. Also refer to the Submittal Data Sheets specified
for your unit.
When connecting supply air duct to Supply Plenum, attach duct to supply air opening flange
when no dampers are used. Otherwise, if dampers are used, attach supply air duct around collar
at bottom of damper assembly.
Gas Piping†
All gas piping must be installed in accordance with local codes. It is required that a ground union
be installed adjacent to the gas valve of each duct furnace, and a ground union be installed just
external of each duct furnace for unit servicing. On vertical runs, a drip leg should be provided
upstream of any control manifold. A gas shutoff valve should be, or may be required by local
codes, installed upstream of the external ground union for each duct furnace. A 1/8 inch N.P.T.
plugged tapping, accessible for test gauge connection, must be installed immediately upstream
of the unit gas supply connection.
†† FFoorr ccoommpplleettee GGaass PPiippiinngg iinnssttaallllaattiioonn,, sseeee OOuuttddoooorr RRooooffttoopp GGaass--FFiirreedd DDuucctt FFuurrnnaaccee
IInnssttaallllaattiioonn aanndd SSeerrvviiccee MMaannuuaall,, aanndd iiff aapppplliiccaabbllee tthhee FFaaccttoorryy IInnssttaalllleedd OOppttiioonnss MMaannuuaall..
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.
Gas piping must be installed to allow for removal of burner drawer for unit maintenance.
IInnssttaallllaattiioonn
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