30
MUA-SVX005B-EN
Maintenance
WWAARRNNIINNGG
HHaazzaarrddoouuss VVoollttaaggee!!
FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg.. FFoollllooww
pprrooppeerr lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr ccaann nnoott bbee iinnaaddvveerrtteennttllyy
eenneerrggiizzeedd.. VVeerriiffyy tthhaatt nnoo ppoowweerr iiss pprreesseenntt wwiitthh aa vvoollttmmeetteerr..
WWAARRNNIINNGG
CChheecckk ooff SSaaffeettyy DDeevviicceess RReeqquuiirreedd!!
FFaaiilluurree ttoo ddoo ffoollllooww iinnssttrruuccttiioonnss bbeellooww ccoouulldd ccaauussee uunnssaaffee ccoonnddiittiioonnss aanndd rreessuulltt iinn ddeeaatthh,,
sseerriioouuss iinnjjuurryy oorr pprrooppeerrttyy ddaammaaggee..
AAllll ssaaffeettyy ccoonnttrroollss MMUUSSTT bbee cchheecckkeedd bbeeffoorree ssttaarrttiinngg tthhee uunniitt aanndd dduurriinngg rreegguullaarr
mmaaiinntteennaannccee!! CChheecckk aanndd tteesstt tthhee ooppeerraattiioonnaall ffuunnccttiioonnss ooff aallll ssaaffeettyy ddeevviicceess ssuupppplliieedd wwiitthh
tthhiiss uunniitt..
• These units have been developed for indoor installation. Maintenance is required and it is
suggested that the following unit servicing and inspections be performed routinely. Also read
in entirety and refer to the Indoor Duct Furnace Manual for maintenance requirements.
• Inspect area near unit to be sure that there is no combustible material located within the
minimum clearance requirements (See Figure 5, p. 14). Service panels provide easy access to
the gas controls (located in duct furnace section), the blower compartment, the electrical
cabinet and the supply plenum. To remove the service door from any of these compartments,
refer to access panel removal section in beginning of this manual.
• The pilot burner can be serviced by removing the pilot plate from the main burner drawer
assembly.
• The (rear) high limit safety switch is accessible by removing the exterior upper jacket, then
remove the mounting plate from the side panel of the heat exchanger. This limit must have
proper surface contact when reinstalled. The (front) primary safety limit is accessible by
removing the mounting cover from the furnace jacket.
Main Burner Drawer Assembly
WWAARRNNIINNGG
HHaazzaarrddoouuss VVoollttaaggee aanndd GGaass!!
FFaaiilluurree ttoo ttuurrnn ooffff ggaass oorr ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg ccoouulldd rreessuulltt iinn aann eexxpplloossiioonn
oorr eelleeccttrrooccuuttiioonn wwhhiicchh ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
TTuurrnn ooffff tthhee ggaass ssuuppppllyy aanndd ddiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee ddiissccoonnnneeccttss,,
bbeeffoorree sseerrvviicciinngg tthhee uunniitt.. FFoollllooww pprrooppeerr lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr
ccaann nnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd..
To remove the main burner drawer assembly (also refer to Indoor Duct Furnace Installation and
Service Manual) for servicing the burners, proceed as follows:
1. Shut off the gas supply at the gas shutoff valve and electrical power to the unit.
2. Break the union upstream of duct furnace gas valve and loosen the union external to the
furnace; swing downward the piping to clear drawer.
3. Disconnect duct furnace gas valve wiring taking note of all wire locations. Disconnect ignitor
and flame sensing probe wires at ignition control module and any other wires.
4. Remove the locking screws holding the burner drawer assembly in position.
5. Slide the burner drawer out of the duct furnace.
6. Removal of burners is accomplished by sliding burner towards manifold, compressing
locating spring, until the rear of the burner clears slot in back of burner drawer.
To Next Page
Loading...