2.6 – Field Fabricate Ductwork
Secure all ducts to building structure. Use flexible duct connectors between unit and ducts as required (a space for 2.5
to 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 through
an 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 lie
directly below unit discharge.
2.7 – Make Unit Duct Connections
Unit is shipped for side duct connections. Ductwork openings are shown in unit dimensional drawings.
2.8 – Trap Condensate Drain
The unit has one 3/4-in. condensate drain connection on the end of the condensate pan and an alternate connection
on the bottom. See Fig. 4. Unit airflow configuration does not determine which drain connection to use. Either
drain 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 this
before 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 drain
connection, remove the red drain plug from the bottom connection (use a 1/2-in. square socket drive extension) and
install 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. 6
Fig. 5 Condensate Drain Details Fig. 6 External Trap Condensate Drain
All units must have an external trap for condensate drainage. Install a trap at least 4-in. (102 mm) deep and
protect against freeze-up. If drain line is installed downstream from the external trap, pitch the line away from the unit
at 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 Connections
Field Power Supply – Unit is factory wired for voltage shown on nameplate. When installing units, provide disconnect
as per NEC (National Electrical Code) requirements, of adequate size. All field wiring must comply with NEC and local
IMPORTANT
A 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.
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