Product data

14
Commercial Hydronic Cassette Fan Coil
HVAC Guide Specifications
Size Range: ¾ to 3 Tons
7,000 to 36,000 Btuh,
Nominal Cooling
15,000 to 66,000 Btuh,
Nominal Heating
Carrier Model Number: 42WKN
Part 1 — General
1.01 SYSTEM DESCRIPTION
Indoor, in-the-ceiling mounted, chilled or hot water
coil, to be matched with a commercial chiller, water
source heat pumps, or hot water boiler (180 F
maximum).
1.02 QUALITY ASSURANCE
Base unit shall be certified by UL (Underwriters Lab-
oratories). Each coil shall be factory tested for leak-
age at 325 psig air pressure with coil submerged in
water. Insulation and adhesive shall meet NFPA-90A
(National Fire Protection Association) requirements
for flame spread and smoke generation. Insulation
shall be rated to UL94 VO. All equipment wiring
shall comply with NEC (National Electrical Code)
requirements.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit shall be stored and handled per manufacturer’s
instructions.
1.04 WARRANTY (One year on parts).
Part 2 — Products
2.01 EQUIPMENT
A. General:
Indoor, downward discharge 2 or 4-pipe low-profile
in-ceiling fan coil. Units shall come complete with
cooling coil or hot water coil (4-pipe systems only),
fan, fan motor, piping connectors, electrical con-
trols, condensate pump, and hanging brackets.
B. Unit Cabinet:
1. Cabinet shall be constructed of galvanized sheet
steel. Cabinet shall have filter tracks and clean-
able filters which shall be accessible from below.
Adjacent room cooling to be provided by a sim-
ple knockout in the cabinet side panel, and cab-
inet shall have provisions to accommodate a
limited amount of ductwork, if desired.
2. Fan shall be a centrifugal, direct-drive blower
type with air intake in center of the unit and dis-
charge on the perimeter. Air louvers shall be
adjustable for 2, 3 or 4-way discharge. Air out-
let vanes shall be fully insulated aluminum to
prevent condensation from forming. Vanes
shall be manually adjustable on unit sizes
08,12, but shall be driven by an electric motor
for unit sizes 18-36.
3. Fascia shall be constructed of high impact
polystyrene.
C. Coil:
1. Standard base unit shall be equipped with a
cooling coil for installation in a 2-pipe system.
Additional coil depth and circuiting shall be pro-
vided for installation in a 4-pipe system.
2. Heating coils are single row, independently cir-
cuited coils specifically designed for hot water
application. Heating coil is located downstream
from cooling coil.
3. Coils shall have ½-in. copper tubes, aluminum
fins bonded to the tubes by mechanical expan-
sion, and a working pressure of 325 psig.
4. Each coil shall have a manual air vent on upper
connection, a drain port on the lower connec-
tion.
D. Motors:
Motor shall be enclosed and with thermal overload
protection, sealed for life lubricated bearings, and
external rotor allowing good heat dissipation. Fan
motor shall be 3-speed.
E. Controls:
Controls shall be 24-v, and shall be easily operated
by the user from a wall-mounted thermostat. A
normally closed float control shall be in the conden-
sate sump to shut unit down in case of pump
malfunction.
F. Alarm Interlock Relay:
Alarm interlock relay shall include a relay for
unit failure notification. Normally open/normally
closed contacts are available for field connection.
G. Filters:
Unit shall have a filter track with factory-supplied
cleanable filters or MERV 8 disposable filters.
H. Electrical Requirements:
Unit shall operate on a 115-v, 208-v, 230-v or
277-v 60 Hz power supply or on 110-v or 220-v 50
Hz power supply as specified on the equipment
schedule.
I. Operating Characteristics:
A one-coil unit installed in a 2-pipe system shall be
capable of providing cooling as specified by the
operating mode of the central water supply system.
A double-circuit coil unit installed in a 4-pipe system
shall be capable of providing sequenced heating and
cooling.
J. Special Features:
1. Fresh Air Intake Kit:
The fresh air intake kit shall include duct collars
for connection to the unit.
2. Duct Collars:
Duct collars shall be available to allow connec-
tion of a 5 in. or 6 in. (depending on unit size)
flexible duct to the cassette.
Guide specifications