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Fan Coil Unit — Vertical Stack Models
HVAC Guide Specifications — 42S
Size Range: 300 to 2000 Nominal Cfm
Carrier Model Numbers:
42SG (Furred-in, 300 to 1200 Cfm)
42SH (Cabinet, 300 to 1200 Cfm)
42SJ (Furred-in, Back-to-Back, 300 to 1200 Cfm)
42SM (Mega, Furred-in, 1400 to 2000 Cfm)
42SU (Universal, Furred-in, 300 to 1200 Cfm)
Part 1 — General
1.01 SYSTEM DESCRIPTION
Stack fan coil units, 2-pipe, 4-pipe or 2-pipe with
electric heat for furred-in or exposed cabinets that
are floor mounted in multi-story buildings.
1.02 QUALITY ASSURANCE
Units shall be tested and certified in accordance with
AHRI (Air-Conditioning, Heating, and Refrigeration
Institute) standard 440, latest edition. All units shall
have C-ETL-US listing signifying the units have been
examined by ETL and are in compliance with both
the US and Canadian applicable standards. Each
coil shall be factory tested for leakage at 300 psig air
pressure with coil submerged in water. Insulation
and adhesive shall meet NFPA (National Fire Pre-
vention Association) 90A requirements for flame
spread and smoke generation.
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, stack fan coil units. Units are
complete with water coil(s), fan(s), motor(s), drain
pan, and all required wiring, piping, controls, and
special features. Standard insulation shall be dual
density fiberglass insulation.
B. Cabinet Stack Unit (42SH):
Outside panels are made of 18-gage galvanized steel
coated with baked-on enamel finish and are fabri-
cated with no exposed fasteners. The interior sur-
faces shall be lined with
1
/
2
-in. thick fiberglass
insulation. The standard cabinet unit has factory-
installed double deflection discharge grille(s) and
stamped supply grille. Controls are factory wired
and mounted in small access panel at front of unit.
C. Furred-In Stack Unit (42SG):
The unit shall be constructed of 18-gage galvanized
steel frame and 18-gage galvanized steel back panel.
The fan coil is for furred-in installation. These units
are designed to have the wallboard applied directly
to the unit surface and all openings have standard
1
/
2
-in. thick fiberglass insulation. Units have double
deflection aluminum discharge grille(s) and painted,
stamped (standard) or bar-type aluminum (optional)
return-air grille panel. Removable return-air grille
provides access to all internal piping and wiring.
Controls are provided with a quick disconnect plug
for field-mounting on front of unit.
D. Back-To-Back Furred-In Stack Units (42SJ):
The open unit shall be constructed of 18-gage galva-
nized steel frame and 18-gage galvanized steel back
panel. These units are similar to the 42SG but are
actually two completely separate units contained in
one cabinet that share a common set of risers.
These units are designed to have the wallboard
directly applied to the unit surface and openings
have standard
1
/
2
-in. drywall flanges. The interior
surfaces shall be lined with
1
/
2
-in. thick fiberglass
insulation. Units have double deflection aluminum
supply grille(s) and painted, stamped (standard) or
bar-type aluminum (optional) return-air grille panel.
Removable return-air grille provides access to all
internal piping and wiring. Controls are provided
with a quick disconnect plug for field-mounting on
front of unit.
E. Universal Furred-In Stack Units (42SU):
Units shall be constructed of heavy-gage galvanized
steel frame and back panel. Interior surfaces shall be
lined with standard fiberglass insulation. Units shall
be designed to have wallboard applied directly to the
unit surface. All units shall include a return air block-
off panel. Units shall have an optional double deflec-
tion aluminum discharge grille(s) or an optional arc-
tic white painted double deflection discharge grille(s).
Unit shall have an arctic white painted stamped steel
return air access panel. Removable return air/access
panel shall provide access to all internal compo-
nents. Controls shall be provided with a quick-con-
nect plug for field-mounting of thermostat on the
front of unit. Units shall have stainless steel hose
kits.
F. Mega Furred-In Stack Units (42SM):
Units shall be constructed of heavy-gage galvanized
steel frame and back panel. Interior surfaces shall
be lined with standard fiberglass insulation.
Optional anti-microbial fiberglass, foil faced or
closed cell insulation is available. Units shall be
designed to have wallboard applied directly to the
unit surface. Controls shall be factory wired and
accessible from the front of the unit. Return air/
access opening shall provide access to all internal
components. All valve package piping to the coil(s)
shall be factory installed.
G. Drain Pan:
Drain pan shall be formed of 18-gage steel and shall
be coated inside with fire-retardant closed-cell foam
insulation. Water never touches the metal pan, elim-
inating the possibility of corrosion. On 42SG, SH,
and SJ units the drain is factory piped to the drain
riser that has a removable “P-trap” allowing easy
cleaning. On 42SU and 42SM units, the drain pan
shall be field piped to the drain riser with a remov-
able/cleanable “P-trap.” On 42SM units, the
Guide specifications — 42S series
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