Carrier 58MCA Installation, Start-up, And Operating Instructions Manual

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Carrier 58MCA Installation, Start-up, And Operating Instructions Manual Manual pdf 30 page image

CONDENSATE DRAINStep 1—GeneralCondensate trap is shipped installed in the blower shelf and factoryconnected for UPFLOW applications. Condensate trap must beRELOCATED for use in DOWNFLOW and HORIZONTALapplications.Condensate trap MUST be used for all applications.An external trap is not required when connecting the field drain tothis condensate trap.The field drain connection (condensate trap or drain tube coupling)is sized for 1/2-in. CPVC, 1/2-in. PVC, or 5/8-in. ID tubeconnection.Drain pipe and fittings must conform to ANSI standards andASTM D1785 or D2846. CPVC or PVC cement and primer mustconform to ASTM D2564 or F493. In Canada, use CSA or ULCcertified schedule 40 CPVC or PVC drain pipe, fittings, andcement.When a condensate pump is required, select a pump which isapproved for condensing furnace applications. To avoid conden-sate spillage, select a pump with an overflow switch.Furnace condensate is mildly acidic, typically in the pH range of3.2 to 4.5. Due to corrosive nature of this condensate, a condensatepH neutralizing filter may be desired. Check with local authoritiesto determine if a pH neutralizer is required.Step 2—ApplicationThe furnace, A/C, and humidifier drains may be combined anddrained together. The A/C drain must have an external, field-supplied trap prior to the furnace drain connection. All drainconnections (furnace, A/C, or humidifier) must be terminated intoan open or vented drain as close to the respective equipment aspossible to prevent siphoning of the equipment’s drain.See Fig. 40 for example of possible field drain attachment using1/2-in. CPVC or PVC tee for vent and A/C or humidifier drainconnection.Outdoor draining of the furnace is permissible if allowed by localcodes. Caution should be taken when freezing ambient may freezedrain pipe and prohibit draining.Table 7—Maximum Allowable Exposed Vent Pipe Length (Ft) With and Without Insulationin Winter Design Temperature Ambient*UNITSIZEWINTER DESIGNTEMPERATURE(°F)MAX PIPEDIAMETER(IN.)WITHOUTINSULATIONWITH 3/8-IN. ORTHICKER INSULATION†04020 2 45 700 2 28 70-20 2 10 5806020 2 65 700 2 35 70-20 2 20 7008020 2-1/2 70 700 2-1/2 47 70-20 2-1/2 28 7010020 3 70 700 3 50 70-20 3 28 7012020 4 70 700 4 48 70-20 4 23 7014020 4 70 700 4 57 70-20 4 30 70* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe lengthas specified in Table 6.† Insulation thickness based on R value of 3.5 per in.Unit must not be installed, operated, and then turned off andleft in an unoccupied structure during cold weather whentemperature drops to 32°F and below unless drain trap anddrain line have adequate freeze protection. See Service andMaintenance Instructions for winterizing procedure.A9305832°F MINIMUM INSTALLEDAMBIENT OR FREEZEPROTECTION REQUIRED30