Carrier 58MTB Service And Maintenance Instructions

Also see for 58MTB: User's information manual Owner's manual Installation, start-up, and operating instructions

Contents

4Table 1 – Furnace Air Filter TableFURNACE CASING WIDTHIN (MM)FILTER QUANTITY AND SIZE *FILTER TYPE*SIDE RETURN*IN (MM)BOTTOM RETURN*IN (MM)17--- 1/2 (445) (1) 16 x 25 x 3/4(406 x 635 x 19)(1) 16 x 25 x 3/4(406 x 635 x 19) 3/4” (19 mm) thick washable21 (533 ) (1) 16 x 25 x 3/4(406 x 635 x 19)(1) 20 x 25 x 3/4(508 x 635 x 19) 3/4” (19 mm) thick washable24--- 1/2 (610) (1) 16 x 25 x 3/4(406 x 635 x 19)(1) 24 x 25 x 3/4(610 x 635 x 19) 3/4” (19 mm) thick washableTable 2 – Air Filter Located in Filter CabinetFILTER CABINET HEIGHT --- IN (MM) FILTER SIZE --- IN (MM) FILTER TYPE16 (406)(1) 16 x 25 x 3/4*(406 x 635 x 19) or(1) 16 x 25 x 4--- 5/16(406 x 635 x 110)Washable20 (508)(1) 20 x 25 x 3/4*(508 x 635 x 19) or(1) 20 x 25 x 4--- 5/16(508 x 635 x 110)Washable24 (610)(1) 24 x 25 x 3/4*or(610 x 635 x 19) or(1) 24 x 25 x 4--- 5/16(610 x 635 x 110)Washable* Filters with a side return--air may have a different filter size. Measure the filter to obtain the correct size.Step 2 — Blower Motor and Wheel MaintenanceTo ensure long life, economy, and high efficiency, cleanaccumulated dirt and grease from blower wheel and motorannually.The inducer and blower motors are pre--lubricated and require noadditional lubrication. These motors can be identified by theabsence of oil ports on each end of the motor.The following items should be performed by a qualified servicetechnician.Clean blower motor and wheel as follows:1. Turn off electrical supply to furnace.2. Remove main furnace door and blower access panel.FILTERFILTERSUPPORTFILTERRETAINERWASHABLE FILTER ORDISPOSABLE MEDIA FILTERIN FILTER CABINETA08588Fig. 3 -- Bottom Filter Arrangement3. Disconnect blower motor wires from furnace control. Fieldthermostat connections may need to be disconnected de-pending on their length and routing.4. Remove control box mounting screws and position controlbox, transformer, and door switch assembly to right side offurnace casing.5. If condensate trap is located in left-- or right--hand side offurnace casing, proceed to item 6, otherwise remove trapand tubing as described below (See Fig. 5):a. Disconnect field drain connection from condensate trap.b. Disconnect drain and relief port tubes from condensatetrap.c. Remove condensate trap from blower shelf.6. Remove screws securing blower assembly to blower shelfand slide blower assembly out of furnace. Detach groundwire and disconnect blower motor harness plugs fromblower motor.NOTE: Blower wheel is fragile. Use care.7. Clean blower wheel and motor by using a vacuum with softbrush attachment. Be careful not to disturb balance weights(clips) on blower wheel vanes. Do not bend wheel or bladesas balance will be affected.8. If greasy residue is present on blower wheel, remove wheelfrom the blower housing and wash it with an appropriatedegreaser. To remove wheel:a. Mark blower wheel location on shaft before disassemblyto ensure proper reassembly.b. Loosen setscrew holding blower wheel on motor shaft.NOTE: Mark blower mounting arms and blower housing so eacharm is positioned at the same hole location during reassembly.c. Mark blower wheel orientation and cutoff plate locationto ensure proper reassembly.d. Remove screws securing cutoff plate and remove cutoffplate from housing.e. Remove bolts holding motor mounts to blower housingand slide motor and mounts out of housing. Disconnectcapacitor and ground wire attached to blower housingbefore removing motor. Motor mounts do not need tobe removed from motor.f. Remove blower wheel from housing.58MTB