48VLU-E, 48VLU-F Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
24
Typical Piping and Wiring
A09230
A09231
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.
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.
ROOF
RETURN-AIR
FLEXIBLE DUCT
CEILING
CONCENTRIC DIFFUSER BOX
(FIELD-SUPPLIED)
SUPPLY-AIR
FLEXIBLE DUCT
ROOF-MOUNTING
CURB
INDOOR
THERMOSTAT
DISCONNECT
PER NEC*
FROM
POWER
SOURCE
RETURN
AIR
TOP COVER
FROM
GAS LINE
*NEC
- NATIONAL ELECTRICAL CODE
