Carrier 48SS - Manual (Page 19)

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Condensate trap — A 2-in condensate trap must be field
supplied.
Ductwork
— Secure downflow discharge ductwork to roof
curb For horizontal discharge applications, attach ductwork
to unit with flanges
To convert a unit to downflow discharge or horizon­
tal discharge
— Units are equipped with factory-installed
duct covers on both the downflow and horizontal openings
Remove appropriate duct panel covers for intended dis­
charge application Units with downflow option do not re­
quire duct panel cover removal
Thermostat — To achieve simultaneous economizer cool­
ing and mechanical cooling, use of 2-stage cooling thermo­
stat is recommended for all units equipped with an accessory
economizer
Airflow — Units are draw-thru on cooling and blow-thru
on heating
Maximum cooling airflow
— To minimize the possibility
of condensate blow-off from evaporator, airflow through units
should not exceed 450 cfm/ton
Minimum cooling airflow
is 350 cfm/ton
Minimum ambient operating temperature for all stand­
ard units is 40 F. With accessory low ambient temperature
kit, units can operate at temperatures down to 0° F
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