Carrier 50SS018-060 Installation, Start-up And Service Instructions Manual

Contents

MAINTENANCETo ensure continuing high performance, and to minimizethe possibility of premature equipment failure, periodic main-tenance must be performed on this equipment. This coolingunit should be inspected at least once each year by a quali-fied service person. To troubleshoot cooling of units, refer toTroubleshooting chart in back of book.NOTE TO EQUIPMENT OWNER: Consult your local dealerabout the availability of a maintenance contract.The ability to properly perform maintenance on thisequipment requires certain expertise, mechanical skills,tools and equipment. If you do not possess these, do notattempt to perform any maintenance on thisequipment, other than those procedures recommendedin the User’s Manual. FAILURE TO HEED THIS WARN-ING COULD RESULT IN SERIOUS PERSONAL IN-JURY AND POSSIBLE DAMAGE TO THIS EQUIP-MENT.The minimum maintenance requirements for this equip-ment are as follows:1. Inspect air filter(s) each month. Clean or replace whennecessary.2. Inspect indoor coil, drain pan, and condensate drain eachcooling season for cleanliness. Clean when necessary.3. Inspect blower motor and wheel for cleanliness and checklubrication each cooling season. Clean and lubricate (ifrequired) when necessary. For first heating season, in-spect blower wheel bimonthly to determine proper clean-ing frequency.4. Check electrical connections for tightness and controlsfor proper operation each cooling season. Service whennecessary.Failure to follow these warnings could result in seriouspersonal injury:1. Turn off electrical power to the unit before perform-ing any maintenance or service on the unit.2. Use extreme caution when removing panels and parts.As with any mechanical equipment, personal injurycan result from sharp edges.3. Never place anything combustible either on, or in con-tact with, the unit.Air FilterNever operate the unit without a suitable air filter in thereturn-air duct system. Always replace the filter with thesame dimensional size and type as originally installed.See Tables 1 and 2 for recommended filter sizes.Inspect air filter(s) at least once each month and replace(throwaway-type) or clean (cleanable-type) at least twice dur-ing each cooling season or whenever the filters become cloggedwith dust and lint.Replace filters with the same dimensional size and type asoriginally provided, when necessary.Unit Top RemovalNOTE: When performing maintenance or service proce-dures that require removal of the unit top, be sure toperform all of the routine maintenance procedures that re-quire top removal, including coil inspection and cleaning,and condensate drain pan inspection and cleaning.Only qualified service personnel should perform mainte-nance and service procedures that require unit top removal.Refer to the following top removal procedures:1. Remove 7 screws on unit top cover surface. (Save all screws.)2. Remove 4 screws on unit top cover flange. (Save all screws.)3. Lift top from unit carefully. Set top on edge and makesure that top is supported by unit side that is oppositeduct (or plenum) side.4. Carefully replace and secure unit top to unit, using screwsremoved in Steps 1 and 2, when maintenance and/or serv-ice procedures are completed.Evaporator Blower and MotorNOTE: Motors without oilers are prelubricated. Do not at-tempt to lubricate these motors.For longer life, operating economy, and continuing effi-ciency, clean accumulated dirt and grease from the blowerwheel and motor annually.Lubricate the motor every 5 years if the motor is used in-termittently (thermostat FAN switch in AUTO. position), orevery 2 years if the motor is used continuously (thermostatFAN switch in ON position).Disconnect and tag electrical power to the unit beforecleaning and lubricating the blower motor and wheel.Failure to adhere to this warning could cause personalinjury or death.To clean and lubricate the blower motor and wheel:1. Remove and disassemble blower assembly as follows:a. Remove blower access door.b. For standard non-ICM units, disconnect motor lead fromIFR. Disconnect yellow motor lead from terminal L2of the contactor.c. Remove blower assembly from all units. Be carefulnot to tear insulation in blower compartment.d. Ensure proper reassembly by marking blower wheeland motor in relation to blower housing beforedisassembly.e. Loosen setscrew(s) which secure wheel to motor shaft.Remove screws that secure motor mount brackets tohousing and slide motor and motor mount out ofhousing.2. Lubricate motor as follows:a. Thoroughly clean all accumulations of dirt or greasefrom motor housing.b. Remove dust caps or plugs from oil ports located ateach end of motor.c. Use a good grade of SAE 20 nondetergent motor oiland put one teaspoon (1 ⁄16 oz. or 16 to 25 drops) ineach oil port.d. Allow time for oil to be absorbed by each bearing,then wipe excess oil from motor housing.e. Replace dust caps or plugs in oil ports.3. Remove and clean blower wheel as follows:a. Ensure proper reassembly by marking wheel orienta-tion and cutoff plate location.b. Remove screws holding cut-off plate, and remove platefrom housing.40