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Outdoor installation — Units approved for outdoor
installation only.
Ductwork — Secure vertical discharge ductwork to roof
curb. For horizontal discharge applications, either attach
ductwork to unit, or use field-supplied flanges attached to
the horizontal discharge openings and attach all ductwork
to flanges.
Horizontal discharge — To convert from vertical dis-
charge to horizontal discharge:
1. Remove economizer or two-position damper to gain
access to return duct opening.
2. Move the horizontal-discharge duct opening covers to
the vertical discharge openings.
3. Rotate economizer or two-position damper
90 degrees.
4. Rotate the barometric relief damper 90 degrees.
5. Install block-off plate over the opening on the access
panel.
Thru-the-curb service connections — Roof curb con-
nections allow field power wires and control wires to enter
through the roof curb opening.
Thru-the-bottom service connections — Power con-
nections made through the bottom of the unit must utilize
an accessory Carrier roof curb and accessory thru-the-bot-
tom power connection accessory kit.
Thermostat — Use of 2-stage heating and cooling ther-
mostat is recommended for all units. A 2-stage cooling
thermostat is required on units with accessory economizer
to provide integrated cooling.
Heating-to-cooling changeover — All units are auto-
matic changeover from heating to cooling when automatic
changeover thermostat and subbase are used.
Airflow — Units are draw-thru on cooling and blow-thru
on heating.
Maximum airflow — To minimize the possibility of con-
densate blow-off from evaporator, airflow through units
should not exceed 67 L/s per kW (500 cfm/ton).
Minimum airflow — For cooling minimum airflow is
40 L/s per kW (300 cfm/ton). For 50TFF007-014 units
with electric heating, required minimum L/s (cfm) is 849
(1800) for 50TFF007; 1062 (2250) for 50TFF008; 1203
(2550) for 50TFF009; and 1416 (3000) for 50TFF012
and 014.
Minimum ambient cooling operating temperature
— The minimum temperature for standard units is –4 C
(25 F). With accessory Motormaster® II control, units can
operate at outdoor temperatures down to –17.8 C (0° F).
Internal unit design — Due to Carrier’s internal unit
design (draw-thru over the motor), air path, and specially
designed motors, the full kW horsepower (maximum con-
tinuous bkW and bhp) listed in the Physical Data tables and
the notes following each Fan Performance table can be uti-
lized with confidence.
Using Carrier motors with the values listed in the Physi-
cal and Fan Performance Data tables will not result in nui-
sance tripping or premature motor failure. The unit
warranty will not be affected.
Apollo direct digital controls — The Apollo direct digi-
tal controls must be used with either a Carrier master or
monitor thermostat.
Application data
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