MCAC-RTSM-2014-03 R410A Rooftop Package Unit 60Hz
5. List of Functions
5.1 Standard specifications
A. General
Packaged cooling is suitable for mounting on the roof or ground. The packaged unit consists of scroll
compressors, evaporator coil, condenser coil, control wiring and interconnecting piping- all factory
assembled and mounted on heavy gauge G-90 galvanized steel sheet press formed base, ready for field
connection to utilities and ducts. The packaged unit is of rigid construction with holes provided in the base
rails for overhead rigging. The unit is provided with an integral weather resistant control panel.
B. Unit enclosure
Panels are of heavy gauge, G-90 galvanized steel sheet with removable access panels, completely
weatherized for outdoor installation and properly reinforced and brazed. Panels and access door are
provided for inspection and access for all internal parts. Enclosures are provided with adequately
reinforced points of support for setting in the unit. Steel sheet panels are zinc-coated and galvanized by the
hot dip process of lock forming quality conforming to ASTM A 653 commercial weight G-90, followed by
baked on electrostatic polyester dry powder coat paint, on all external panel.
C. Compressor
All the models adopt scroll compressors which will be provided with all the standard controls and
accessories necessary for safe operation. These are equipped with internal motor protector; factory
installed crank case heater and rubber vibration isolator for quiet and efficient operation.
D. Air-cooled condensing section
1. The air-cooled condensing section is enclosed within the unit housing and consists of condenser coil,
fan(s) electric motor(s) and inherently protected compressor(s). Inner grooved copper tubes with wall
thickness of 0.3mm, mechanically bonded to enhanced louvered aluminum fins are standard for all
condenser coils. As an option, enhanced coated aluminum fins may be provided. Tube support sheets are
galvanized steel, formed to provide structural strength.
2. Fans are axial type, directly driven, upward discharge and provided with fan grille mounted on the
casing.
3. Motors are totally enclosed air-over type with class F insulation. Inherent thermal protection is automatic
reset type.
E. Evaporator coil section
1. All cooling coils are of enhanced louvered fins and inner grooved copper tubes with wall thickness of
0.3mm, mechanically bonded to aluminum fins. As option, enhanced coated aluminum fins may be
provided. Tube support sheets are galvanized steel, formed to provide structural strength.
2. Drainage pan: An insulated drainage pan made of G-90 galvanized steel is provided, for additional
corrosion protection.
3. Insulation: Insulation is supplied in adequate density and thickness for all units to prevent condensation
from forming on the unit casing. Insulation meets the requirements of NFPA 90A and is protected against
deterioration and erosion from air currents.
F. Evaporator fan
Evaporator fan adopts centrifugal forward-curved blade design and meets the handling total required CFM ,
static pressure in the low and the medium ranges. Casings are made of galvanized steel. Blower motors
adopt open drip proof type (totally enclosed types are optional) and conform to NEMA MG-1 and MG-2.
Blower motor is mounted on adjustable base and secured by locking device. Shaft is turned, ground and
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