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ENGINEERS’ SPECIFICATION GUIDE — MODELS 558D036-150 (3 TO 12
1
⁄
2
TONS)
GENERAL: Furnish and install single-package, outdoor rooftop-
mounted, electrically controlled cooling unit utilizing a recipro-
cating compressor. Unit shall discharge supply air vertically or
horizontally as shown on the contract drawings.
Nominal unit electrical characteristics shall be
v,
phase, 60 Hz. The unit shall be capable of satisfac-
tory operation within voltage limits of
vto v.
COOLING CAPACITY: Total cooling capacity of the unit shall
be
Btuh or greater, and sensible capacity shall be
Btuh or greater at conditions of cfm evapo-
rator air entering unit at
F dry bulb, F wet
bulb and condenser entering air of
F dry bulb. Total
design conditions shall be a minimum of
Btuh/Watt.
CABINET: The cabinet shall be constructed of galvanized steel,
bonderized, and coated with a prepainted baked enamel finish.
COMPRESSOR: Compressor shall be of the fully-hermetic type
with suitable vibration isolators.
CONDENSER SECTION: The condenser coils shall have alu-
minum plate fins mechanically bonded to seamless copper
tubes with all joints brazed. Condenser fan shall be of the direct-
drive propeller type and shall discharge air vertically. Fan shall
have permanently lubricated bearings.
EVAPORATOR SECTION: Evaporator coils shall have alumi-
num plate fins mechanically bonded to seamless copper tubes
with all joints brazed. Evaporator fan shall be direct drive with 2
or 3 speeds or belt drive as shown on the equipment drawings.
Belt drive shall include an adjustable pitch motor pulley. Bear-
ings shall be sealed, permanently lubricated, ball-bearing type.
REFRIGERANT SYSTEM: Refrigerant system shall include
strainer assembly, fixed orifice feed system, and service gage
connections on suction line, liquid line, and compressor dis-
charge line.
FILTER SECTION: Filter section shall consist of factory-
installed low velocity, 2-in. thick throwaway fiberglass filters of
commercially available sizes. Filter access panel shall provide
tool-less filter removal.
CONTROLS: Unit shall be complete with self-contained low-
voltage control circuit. Safeties shall include compressor over-
temperature and overcurrent.
APPROVALS: The unit shall be CSA (036-072) or UL Canada
(090-150) design certified and UL tested and certified. All wiring
shall be in accordance with NEC, and units shall meet ASHRAE
Standard 62. The unit shall be rated in accordance with ARI
Standards 210/240 or 360 and 270. Units shall be designed to
conform to NRCA standards. Insulation and adhesive shall
meet NFPA 90A requirements for flame spread and smoke
generation.
OPTIONS: Factory-installed integrated economizer shall in-
clude all hardware and controls to provide cooling using outdoor
air alone, or in conjunction with mechanical cooling. Dampers
shall be low leakage type, not to exceed 3% leakage at
1.0 in. wg pressure differential. Economizer shall be capable of
introducing up to 100% outdoor air and shall be equipped with a
barometric relief damper. Economizer controls shall be dry-bulb
(variable sliding plate type economizer) or enthalpy (parallel-
opposed blade type economizer) type. Damper shall close on
power loss.
Other factory-installed options shall include: 25% and 100%
manual outdoor-air dampers, controls upgrade kit, condenser
coil grille, and alternate evaporator-fan motors (036-060,
120,150) and/or drives (036-060,090,120,150).
ACCESSORIES: Field-installed accessories shall include:
Variable sliding plate type economizer, roof curb (14 or 24 in.),
two-position dampers, 25% and 50% manual outdoor-air damp-
ers, low ambient kit, short cycle circuit protection, thermostats
and subbases, condenser coil hail guard, enthalpy control, elec-
tric resistance heaters, single point packages, controls upgrade
kit, thru-the-bottom power connection package, condenser coil
grille, head pressure control, fan/filter status, and enthalpy con-
trol sensor.
65