Application Data - Carrier Comfort 48VLU-E Product Data

48VLU-E, 48VLU-F Ultra Low NOx: Product Data
Typical Piping and Wiring
ROOF-MOUNTING
CURB
SUPPLY-AIR
FLEXIBLE DUCT

Application Data

Condensate trap — A 2-in. (50.8 mm) 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 — Units are equipped with
factory-installed inserts in the down-flow openings. Removal of the
inserts is similar to removing an electrical knock-out. Use the duct cover
to seal the horizontal discharge openings in the unit. Units installed in
horizontal discharge orientation do not require duct covers.
Airflow — Units are draw-thru in the cooling mode and blow-thru in the
heating mode.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
CONCENTRIC DIFFUSER BOX
(FIELD-SUPPLIED)
TOP COVER
CEILING
RETURN
AIR
FROM
GAS LINE
*NEC - NATIONAL ELECTRICAL CODE
Maximum cooling airflow — To minimize the possibility of
condensate blow-off from the evaporator, airflow through the units
should not exceed 450 CFM per ton.
Minimum cooling airflow — Minimum cooling airflow is 350 cfm per
ton.
Minimum ambient cooling operation temperature — All standard
units have a minimum ambient operating temperature of 40_F (4_C).
With accessory low ambient temperature kit, units can operate at
temperatures down to 0_F (-17_C).
Minimum temperature — Air entering the heat exchanger in heating
mode must be a minimum of 50_F (10_C) continuous and/or 45_F (7_C)
intermittent.
24
ROOF
RETURN-AIR
FLEXIBLE DUCT
INDOOR
THERMOSTAT
FROM
POWER
SOURCE
DISCONNECT
PER NEC*
A09230
A09231