22
System Fan Coil Unit
HVAC Guide Specifications
Size Range:
800 to 4000 Nominal Cfm
Carrier Model Number:
42BHC
Part 1 — General
1.01 SYSTEM DESCRIPTION
Horizontal, 2-pipe or 4-pipe, belt-driven, galvanized
casing model fan coil unit for ducted installation
above the ceiling, with full access to internal
components.
1.02 QUALITY ASSURANCE
Each coil shall be factory tested for leakage at
350 psig air pressure with coil submerged in water.
Insulation and adhesive shall meet NFPA-90A
requirements for flame spread and smoke genera-
tion. Factory-installed motors shall be UL approved.
1.03 DELIVERY, STORAGE AND HANDLING
Unit shall be handled and stored in accordance with
the manufacturer’s instructions.
Part 2 — Products
2.01 EQUIPMENT
A. General:
Factory-assembled, horizontal, draw-thru type fan
coil unit for ducted installation above the ceiling.
Unit shall be complete with water coils, fan(s),
motor, belt drive, drain pan, and filter.
B. Casing:
Construction shall be heavy-gage galvanized steel,
lined with one-in. thick fiberglass Tuf-Skin™ II
thermal/acoustical insulation. Knockouts shall be
provided for hanging the unit, that will accept
3
/
8
-in.
threaded rod at the top, and bottom of all unit cor-
ners. Supply and return duct connection shall be
one inch long. Removable side panels shall be pro-
vided for access to the fan/motor assembly. A
double-sloped drain pan shall be constructed of
stainless steel, extending under the full length and
width of the coil(s) with a
3
/
4
-in. male nominal pipe
thread stainless steel drain connection and
1
/
2
-in.
male MPT stainless secondary drain connection
(capped when not required). The outside surface of
the drain pan shall be insulated with
1
/
8
-in. closed
cell insulation.
C. Fans:
Belt-driven, double-width fan wheels shall have
forward-curved blades and be statically and dynami-
cally balanced. Fan drive shall consist of variable-
pitch motor pulley, fixed-pitch fan pulley and V-belt.
Fans and scrolls shall be of galvanized steel.
D. Coils:
Standard unit shall be equipped with a 4-row coil for
installation in a 2-pipe system and additional rows of
coil shall be provided for installation in a 4-pipe sys-
tem as described in the Special Features section.
Coils shall have
1
/
2
-in. copper tubes, aluminum fins
bonded to the tubes by mechanical expansion and
have a working pressure of 250 psig at 200 F. Each
coil shall have a manual air vent and sweat connec-
tions for copper tubes.
E. Operating Characteristics:
A single-circuit coil unit installed in a 2-pipe system
shall be capable of providing heating or cooling as
determined 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 pro-
viding sequenced heating and cooling.
F. Motor(s):
Fan motors shall be open, drip-proof, single-speed,
60 Hz, 1750 rpm single or 3-phase, suitable for
continuous duty at 104 F (40 C). Single-phase
motors are capacitor start, include automatic reset
thermal overload protection and are available in
115, 208, 230, or 277 volts (60 Hz). Three-phase
motors are available in 208, 230, or 460 volts
(60 Hz). Motors are resilient base mounted (except
3 hp motors which are rigid base mounted).
G. Electric Heat:
Electric heaters are available on the 42BHC units.
The heater shall be constructed of high-grade resis-
tance wire supported by ceramic insulators on plated
steel brackets. These heat elements are suspended
in front of the outlet, after the blower and coil. High-
limit thermal cutouts shall protect the heat elements
in the event of an air failure.
H. Special Features:
Certain standard features are not applicable when the
features designated by * are specified. See your local
Carrier Sales Office for amending specifications.
* 1. Coils:
a. Unit coil(s) shall be equipped with automatic
air vent(s).
b. Unit shall be equipped with a high-capacity
6-row or 8-row coil for installation in a
2-pipe system.
c. For installation in a 4-pipe system, unit shall
be equipped with either a 4-row cooling/
1-row hot water heating split-circuit coil, or
a 4/2, 6/1, or 6/2 split-circuit coil as
required.
Guide specifications
