Guide Specifications - Payne PY3G Series Product Data

GUIDE SPECIFICATIONS

Packaged Gas Heating/Electric Cooling Units
Constant Volume Application
HVAC Guide Specifications
Size Range: 2 to 5 Tons, Nominal Cooling
Model Number: PY3G
Part 1 — General
SYSTEM DESCRIPTION
Outdoor rooftop mounted, gas heating/electric cooling unit
utilizing a hermetic scroll compressor for cooling duty. Unit
shall discharge supply air vertically or horizontally as shown
on contract drawings. Condenser fan/coil section shall have a
draw- -thru design with vertical discharge for minimum sound
levels.
QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards 210/240
and 270.
B. Unit shall be designed in accordance with UL Standard 1995
and ANSI Z21.47/CSA 2.3.
C. Unit shall be manufactured in a facility registered to ISO 9001
manufacturing quality standard.
D. Unit shall be UL listed and c- -UL certified as a total package
for safety requirements.
E. Roof curb shall be designed to conform to NRCA Standards.
F. Insulation and adhesives shall meet NFPA 90.1 requirements
for flame spread and smoke generation.
G. Cabinet insulation shall meet ASHRAE Standard 62.2.
DELIVERY, STORAGE AND HANDLING
Unit shall be stored and handled per manufacturer's
recommendations.
Part 2 — Products
EQUIPMENT
A. General:
Factory- -assembled, single- -piece, heating and cooling unit.
Contained within the enclosure shall be all factory wiring, piping,
controls, refrigerant charge with R- -410A refrigerant, and special
features required prior to field start- -up.
B. Unit Cabinet:
1. Unit cabinet shall
zinc- -coated, pre- -painted steel capable of with- -standing 500
hours in salt spray.
2. Normal service shall be through a single removable cabinet
panel.
3. The unit shall be constructed on a rust proof unit base that
has an externally trapped, integrated sloped drain.
4. Evaporator fan compartment top surface shall be insulated
with a minimum 1/2- -in. (12.7 mm)
fiberglass insulation, coated on the air side and retained by
adhesive and mechanical means. The evaporator wall
sections will be insulated with a minimum semi- -rigid foil- -
faced board capable of being wiped clean. Aluminum foil- -
faced fiberglass insulation shall be used in the entire indoor
air cavity section.
5. Unit shall have a field- -supplied condensate trap.
C. Fans:
1. The evaporator fan shall be a multi- -speed, direct- -drive, as
shown on equipment drawings.
40,000 to 130,000 Btuh,
Nominal Heating Input
be constructed of phosphated,
thick, flexible
2. Fan wheel shall be made from steel, be double- -inlet type
with forward curved blades with corrosion resistant finish.
Fan wheel shall be dynamically balanced.
3. Condenser fan shall be direct drive propeller type with alu-
minum blades riveted to corrosion resistant steel spiders, be
dynamically balanced, and discharge air vertically.
D. Compressor:
1. Fully hermetic compressors with factory- -installed vibration
isolation.
2. Scroll compressors shall be standard on all units.
E. Coils:
Evaporator and condenser coils shall have aluminum plate fins
mechanically bonded to seamless copper tubes with all joints
brazed (Copper/copper
available as option). Tube sheet openings shall be belled to
prevent tube wear.
F. Heating Section:
1. Induced- -draft combustion type with energy saving direct
spark ignition system and redundant main gas valve.
2. Induced- -draft motors shall provide adequate airflow for
combustion.
3. The heat exchangers shall be constructed of aluminized steel
for corrosion resistance.
4. Burners shall be of the in- -shot type constructed of
aluminum coated steel.
5. All gas piping and electric power shall enter the unit cabinet
at a single location.
G. Refrigerant Components:
Refrigerant expansion device shall be of the TXV
(thermostatic expansion valve) type.
H. Filters:
Filter section shall consist of field- -installed, throwaway, 1- -in.
(25 mm) thick fiberglass filters of commercially available
sizes.
I. Controls and Safeties:
1. Unit controls shall be complete with a self- -contained low
voltage control circuit.
2. Compressors shall incorporate a solid- -state compressor
protector that provides reset capability.
J. Operating Characteristics:
1. Unit shall be capable of starting and running at 125_F
(51_C) ambient outdoor temperature per maximum load
criteria of ARI Standard 210.
2. Compressor with standard controls shall be capable of op-
eration down to 40_F (4_C) ambient outdoor temperature.
3. Units shall be provided with fan time delay to prevent cold
air delivery before the heat exchanger warms up.
4. Unit shall be provided with 60- -second fan time delay after
the thermostat is satisfied.
K. Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a single
location.
L. Motors:
1. Compressor motors shall be of the refrigerant- -cooled type
with line- -break thermal and current overload protection.
2. All fan motors shall have permanently lubricated bearings,
and inherent, automatic reset, thermal overload protection.
3. Condenser fan motor shall be totally enclosed.
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and vinyl- -coated construction