Carrier Deluxe 58MVB Service And Maintenance Instructions

Also see for 120 Series: Installation, start-up, and operating instructions Installation, start-up, operating and service and maintenance instructions Manual Operating instructions

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Carrier Deluxe 58MVB Service And Maintenance Instructions Manual pdf 10 page image

10The electrical ground and polarity for 115--v wiring must bemaintained properly. Refer to Fig. 15 for field wiring informationand to Fig. 21 for unit wiring information.2-5/32˝A04181Fig. 14 --- IgniterNOTE: If the polarity is not correct or furnace is not properlygrounded, the STATUS LED on the furnace control will flashrapidly and prevent the furnace from operating. The controlsystem also requires an earth ground for proper operation of thefurnace control and flame sensor.The 24--v circuit contains an automotive--type, 3--amp fuselocated on the furnace control. (See Fig. 16.) Any direct shorts ofthe 24--v wiring during installation, service, or maintenance willcause this fuse to blow. If fuse replacement is required, use ONLYa fuse of identical size. The furnace control LED will flash statuscode 24 when fuse needs to be replaced.With power to the unit disconnected, check all electricalconnections for tightness. Tighten all screws on electricalconnections. If any smoky or burned connections are found,disassemble the connection, clean all parts, strip wire, andreassemble properly and securely.Reconnect electrical supply to unit and observe unit through 1complete operating cycle and check for proper operation.Step 8—Checking Heat Tape Operation(If Applicable)In applications where the ambient temperature around the furnaceis 32_F or lower, freeze protection measures are required. If thisapplication is where heat tape has been applied, check to ensure itwill operate when low temperatures are present.NOTE: Heat tape, when used, should be wrapped around thecondensate drain trap and drain line. There is no need to use heattape within the furnace casing. Most heat tapes are temperatureactivated, and it is not practical to verify the actual heating of thetape. Check the following:1. Check for signs of physical damage to heat tape such asnicks, cuts, abrasions, gnawing by animals, etc.2. Check for discolored heat tape insulation. If any damageor discolored insulation is evident, replace heat tape.3. Check that heat tape power supply circuit is on.UNIT AND PROPERTY DAMAGEFailure to follow this caution may result in furnacecomponent failures or water property damage.If this furnace is to be operated in an unconditioned spacewhere the ambient temperatures may be 32_F or lower,freeze protection measures must be taken. SeeCONDENSATE DRAIN PROTECTION section ofInstallation, Start--up, and Operating Instructions. (See Fig.17.)CAUTION!Step 9—WinterizingUNIT DAMAGE HAZARDFailure to follow this caution may result in furnacecomponent damage.Freezing condensate left in the furnace may damage thefurnace.CAUTION!If the furnace will be off for an extended period of time in astructure where the temperature will drop to 32_F or below,winterize as follows:1. Turn off electrical supply to furnace.2. Remove main furnace door.3. Disconnect upper inducer housing drain connection capfrom inducer housing. (See Fig. 18.)4. Connect field--supplied 1/2--in. I.D. inducer housing tubeto upper inducer housing drain connection.5. Insert funnel in tube and pour one quart of antifreeze, pro-pylene glycol (RV, swimming pool antifreeze, or equiva-lent) into funnel/tube until it is visible at point where con-densate enters open drain. (See Fig. 19.)58MVB