Trane GGAA - High Limit And;Or Safety Limit Maintenance

MUA-SVX005B-EN
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7. With burner drawer removed from duct furnace, inspect the inside surfaces of the heat
exchanger. Wire brush if necessary.
8. Remove any dirt, dust or other foreign matter from the burners using a wire brush and/or
compressed air. Insure all parts of the burner are unobstructed. Inspect and clean pilot burner
if necessary.
9. Reassemble the duct furnace by replacing all parts in order.
10. Light unit per the unit lighting instructions.
11. Check the burner adjustment. See the “Primary Air Shutter Adjustment,” p. 27 section of this
manual.
12. Check all gas control valves and pipe connections for leaks.
WWAARRNNIINNGG
CCoommbbuussttiibbllee MMaatteerriiaallss!!
FFaaiilluurree ttoo mmaaiinnttaaiinn pprrooppeerr cclleeaarraannccee bbeettwweeeenn tthhee uunniitt aanndd ccoommbbuussttiibbllee mmaatteerriiaallss ccoouulldd
ccaauussee aa ffiirree wwhhiicchh ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy oorr pprrooppeerrttyy ddaammaaggee..
RReeffeerr ttoo uunniitt nnaammeeppllaattee aanndd iinnssttaallllaattiioonn iinnssttrruuccttiioonnss ffoorr pprrooppeerr cclleeaarraanncceess..
13. Check the operation of the duct furnace gas valve by lowering the setting of the thermostat,
stopping the operation of the duct furnace. The duct furnace gas valve should close,
extinguishing the pilot and main burner flames.
14. Inspect and service the blower section of the system.
15. Inspect and check the operational functions of all safety devices equipped with your unit to
ensure that all devices are performing adequately.
High Limit and/or Safety Limit Maintenance
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 service or replace high limit and/or safety limit:
1. Turnoff the manual gas valve and electrical power to the unit.
2. To service the High Limit:
a. Remove the Mounting Cover located on the access side of the unit toward the rear (Air
Inlet) of the furnace section. Remove the mounting plate from the side panel of the heat
exchanger. The mounting plate is part of the High Limit; making note of wire locations for
reconnecting.
b. Remove all electrical connections from the High Limit; making note of wire locations for
reconnecting.
c. Reassemble the High Limit by replacing all parts in order; making sure the High Limit is
making proper surface contact when installed.
3. To service the Safety Limit:
a. Remove Mounting Cover located on the access side of the unit toward the front (Air
Outlet) of the furnace section.
b. Remove all electrical connections from the Safety Limit; making note of wire locations for
reconnecting.
c. Reassemble the Safety Limit by replacing all parts in order; making sure the Safety Limit
is making proper surface contact with the side of the heat exchanger.
MMaaiinntteennaannccee