Advertisement
Frequency ranges for the 9,000 ~ 24,000 Btu/h outdoor units are:
9k Btu/h = 20 Hz to 100 Hz Cooling / Heating
12k Btu/h = 20 Hz to 100 Hz Cooling / Heating
18k Btu/h = 15 to 80 Hz Cooling; 15 to 100 Hz Heating
24k Btu/h = 15 to 80 Hz Cooling; 15 to 100 Hz Heating
Frequency ranges for the 36,000 and 42,000 Btu/h outdoor units are:
36k Btu/h = 10 to 120 Hz Cooling; 10 to 135 Hz Heating
42k Btu/h = 10 to 120 Hz Cooling; 10 to 135 Hz Heating
Coil
Heat pump outdoor unit coils are made of nonferrous louvered
aluminum fins protected with an integral coil guard. The coil for each
outdoor unit has a minimum of 14 fins per inch (FPI); heat exchanger
has two rows. The coil fins have a factory applied corrosion resistant
GoldFin™ material with hydrophilic coating tested in accordance with
ASTM B-117 salt spray test procedure for a minimum of 1,000 hours.
Coils are factory tested to a pressure of 551 psig.
Fans and Motors
The 9,000 Btu/h (LUU090HV), 12,000 Btu/h (LUU120HV), 18,000
Btu/h (LUU180HV),and 24,000 Btu/h (LUU240HV) outdoor units
include one direct drive, variable speed axial / propeller type fan
with a horizontal air discharge; the 36,000 Btu/h (LUU360HV) and
42,000 Btu/h (LUU420HV) include two fans. Fan blades are made
of Acrylonitrile Butadiene Styrene (ABS) material, and have a
Brushless Digitally Controlled (BLDC) fan motor. The fan motor has
inherent protection, permanently lubricated bearings, and variable
speed with a maximum speed up to 850 rpm (9,000 and 12,000
Btu/h), up to 760 rpm (18,000 and 24,000 Btu/h), or up to 750 rpm
(36,000 and 42,000 Btu/h). Raised guards are provided to limit
contact with moving parts.
Indoor Unit
Sound Levels
The indoor units have sound ratings no higher than 47 dB(A) as
tested per ISO Standard 3745.
Casing / Frame
The indoor unit case is constructed coated metal designed to
mount recessed recess in the ceiling, and has a surface-mounted
concentric panel on the bottom of the unit. Cold surfaces are covered
with a coated polystyrene insulating material. The case is provided
with metal ears designed to support the unit weight on four corners.
Ears have pre-punched holes designed to accept field-supplied all-
thread rod hangers.
Unit has four supply air outlets and one return air inlet. The
supply air outlet has four-directional slot diffusers, each equipped
with an independent oscillating motorized guide vane to change
airflow direction. A guide vane algorithm sequentially changes the
predominant discharge airflow direction in counterclockwise pattern,
MECHANICAL SPECIFICATIONS
©
or can be used to lock each
guide vane independently
in a field-adjusted fixed
position. The four vanes can
be individually adjusted from
the wired remote controller to
customize the airflow pattern
for the conditioned space.
A setting in the cooling and
heating modes can cycle the
vanes up and down for uniform
/ random air distribution.
Panels are sold as separate
required accessories. The
four-way panel is white
acrylonitrile butadiene styrene
(ABS) polymeric resin with a
tapered trim edge.
Coil
Indoor unit coils are factory
built and are comprised of
aluminum fins mechanically
bonded to grooved-design
copper tubes with slit coil fins.
Each indoor unit has two (2) rows of coils and: eight (8) columns,
18 fins per inch (9,000 and 12,000 Btu/h); ten (10) columns, 18 fins
per inch (18,000 Btu/h); eight (8) columns, 19 fins per inch (24,000
Btu/h); 12 columns, 21 fins per inch (36,000 Btu/h); 18 columns, 24
fins per inch (42,000 Btu/h) that are pressure tested to 551 psig at
the factory. Each unit is provided with a factory installed condensate
drain pan below the coil.
Fans and Motors
All of the indoor units have a single, direct-drive, turbo fan
manufactured of high-strength ABS HT-700 polymeric resin; the fans
are statically and dynamically balanced. The fan motor is brushless
digitally controlled (BLDC) with permanently lubricated and sealed
ball bearings. The fan motor includes thermal, overcurrent and low
RPM protection. The fan / motor assembly is mounted on vibration-
attenuating rubber grommets.
Fan speed is controlled using a microprocessor-based, direct-digital
control algorithm that provides pre-programmed, field-selectable
fixed or auto fan speeds in the Heating and Cooling modes. The fan
speeds can be field adjusted between low, medium, and high. Auto
setting adjusts the fan speed based on the difference between the
controller set-point and space temperature.
Microprocessor Controls
A temperature thermistor is factory-mounted in the return air
stream. All unit operation parameters, excluding the unit operating
schedule, are stored in non-volatile memory resident on the unit
Figure 3: Four-Way Ceiling
Cassette System (LC369HV,
LC429HV Models).
PRODUCT DATA | 9
Advertisement
