York NC090-300, Technical Manual

Page: 7 / 128

505428-YTG-V-0417
Johnson Controls Unitary Products 7
• The capacity of the condensing unit shall meet or
exceed _____ Btuh at a suction temperature of _____
F. The power consumption at full load shall not exceed
_____ kW.
• The combination of the condensing unit and the
evaporator or fan coil unit shall have a total net cooling
capacity of _____ Btuh or greater at conditions of
_____ cfm entering-air temperature at the evaporator at
_____ F wet bulb and _____ F dry bulb, and air
entering the condensing unit at _____F.
• The system shall have an EER of _____ Btuh/ Watt or
greater at standard AHRI conditions.
Installer Shall
• Furnish York® air-cooled condensing units, heat pump
or equivalent in accordance with the performance
schedule shown on the plans, and
• Unit shall be stored and handled in accordance with unit
manufacturer's instructions.
• Install each unit as shown on the plans in accordance
with the manufacturer’s recommendations and all
applicable national and local codes
Unit Construction
• Constructed of zinc-coated, galvanized steel.
• Exterior surfaces bonded and coated with baked
enamel finish by a powder paint process capable of
withstanding a minimum of 1000 salt spray hours
according to ASTM B117.
• Cabinet screws that comply with ASTM B117 salt spray
test for a minimum of 750 hours.
• Permanently attached heavy-gage perimeter base rails
with forklift slots and lifting holes.
• Removable access panels to all internal components.
• Separate access panel to controls.
• Access panels to allow outdoor coil cleaning.
Compressor(s)
• Hermetic scroll type, internally protected with high-
pressure relief and over temperature protection.
• Two stage units operate in 50% capacity increments.
• Suction gas cooled
• Voltage range of ±10% of unit nameplate voltage.
• Neoprene isolators minimize sound transmission and
vibration.
• Belly-band crankcase heaters keep refrigerant from
diluting sump oil.
• Full charge of compressor oil
Outdoor Condenser Unit Coils
• Draw thru configuration
• Constructed with Micro-channel aluminum fins and
aluminum tubing.
Heat Pump Unit Outdoor Unit Coils
• Draw thru configuration
• Constructed with aluminum plate fins mechanically
bonded to seamless internally enhanced copper tubes
with all joints brazed.
Condenser Fans
• Direct driven propeller-type fans
• Aluminum blades riveted to corrosion resistant steel
spider brackets.
• Arranged for vertical air discharge.
• Equipped with PVC coated steel wire safety guards.
Condenser Motors
• Totally enclosed, air over cooled.
• Inherent overload protection.
• Permanently lubricated bearings.
• Must cycle to allow cooling operation down to 40°F.
Refrigerant Piping
• Solid core filter-drier(s) ship loose for field installation.
• Liquid and suction line service valves with gauge ports.
• Suction and discharge line service ports accessible
from unit. Ports capped for leak prevention.
• Liquid line magnetic check valves
• Holding charge of R410A refrigerant.
Electrical Requirements
• Single-point connection electrical power.
• Nominal unit electrical characteristics shall be _____ v,
3-ph, 60 Hz. The unit shall be capable of satisfactory
operation within voltage limits of ____ v to _____ v.
• Condenser fan motors and secondary of transformers
shall be grounded.
Unit Controls
• All 24-volt control circuit, powered by a 24 volt
transformer(s) and protected by a resettable breaker.
• Conventional thermostat must provide operation for
both condensing units and heat pumps without an “O”
output from the thermostat.
• Low voltage terminal strip for simple hook-up.
• Compressor motor protection shuts down unit for motor
over-current, over-temperature or low voltage
conditions.