Carrier 50TCM Series Installation, Operation And Maintenance Manual

Contents

2.6 – Field Fabricate DuctworkSecure all ducts to building structure. Use flexible duct connectors between unit and ducts as required (a space for 2.5to 3ft is required in case of repairing or replacing the blower wheel). Insulate and weatherproof all external ductwork,joints, and roof openings with counter flashing and mastic in accordance with applicable codes. Ducts passing throughan unconditioned space must be insulated and covered with a vapor barrier.The 50TCM units with electric heat require a 2-in.clearance for the first 24-in. of ductwork. Outlet grilles must not liedirectly below unit discharge.2.7 – Make Unit Duct ConnectionsUnit is shipped for side duct connections. Ductwork openings are shown in unit dimensional drawings.2.8 – Trap Condensate DrainThe unit has one 3/4-in. condensate drain connection on the end of the condensate pan and an alternate connectionon the bottom. See Fig. 4. Unit airflow configuration does not determine which drain connection to use. Eitherdrain connection can be used with vertical or horizontal applications.When using the standard side drain connection, ensure the red plug in the alternate bottom connection is tight. Do thisbefore setting the unit in place.The red drain pan can be tightened with a 1/2-in. square socket drive extension. To use the alternate bottom drainconnection, remove the red drain plug from the bottom connection (use a 1/2-in. square socket drive extension) andinstall it in the side drain connection.The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 6Fig. 5 Condensate Drain Details Fig. 6 External Trap Condensate DrainAll units must have an external trap for condensate drainage. Install a trap at least 4-in. (102 mm) deep andprotect against freeze-up. If drain line is installed downstream from the external trap, pitch the line away from the unitat 1-in. per 10 ft (25 mm in 3 m) of run. Do not use a pipe size smaller than the unit connection (3/4-in.).2.9 – Make Electrical ConnectionsField Power Supply – Unit is factory wired for voltage shown on nameplate. When installing units, provide disconnectas per NEC (National Electrical Code) requirements, of adequate size. All field wiring must comply with NEC and localNOTEIMPORTANTA 90-degree elbow must be provided in drain hole and must be removed in ductwork to comply with UL(Underwriters’ Laboratories) codes for use with electric heat.Page 14