Furnish and install where indicated on plans Qty______
Continental UniPac™ model (USAC, USWC) _________
packaged liquid chiller(s).
The (each) unit shall have a cooling capacity of ______ Tons
with ______ compressor kW when cooling _______GPM of water
from ______°F to _______°F and a cooler fouling factor of 0.00025
Hr. Sq. Ft °F/Btu. The water pressure drop shall not exceed
______ feet of water through the cooler. The USAC entering air
temperature will be _______°F. The USWC unit will be supplied
with ______GPM of _______°F condenser water with a condenser
fouling factor of 0.00025 Hr. Sq. Ft. °F/Btu. The condenser water pressure drop shall not exceed _______ft of water.
The unit overall dimensions shall not exceed ______ins. In
length. _____ins in width and ______ins. In height. The unit
operating weight shall not exceed ______lbs.
General
Packaged Liquid Chiller shall be completely factory assembled including all interconnecting refrigerant piping and internal wiring controls, mounted on a steel frame which accommodates the air (water) cooled condenser, compressor and cooler. The units shall be leak tested, evacuated and shipped with a vapor charge of R-22.
Split chillers shall be field piped, pressure tested, evacuated and then field charged with R-22.
All units shall include the following:
Compressor Motor
USAC/USWC compressor motor shall be state-of-the-art scroll with fewer moving parts and sweated without valves. All compressor(s) shall be mounted on resilient pads to minimize vibration. Safety internal relief per ASA-B9.1 Code.
Cooler
The cooler shall be direct expansion shell and coil type with refrigerant in the shell and liquid to be chilled in the tube. The design working pressure of the cooler shell (liquid) side shall be 150 psig. And 200 psig for the tube (refrigerant) side. The cooler shall be insulated with ¾” closed cell insulation.
Condenser-Air Cooled
The condenser shall be of copper tube, aluminum fin construction. Fans shall be propeller-type direct driven by totally enclosed “air over” motors with built-in overload protection, positioned within the cabinets for weather protection.
Condenser – Water Cooled
The condenser shall be shell and coil type with water flowing through seamless copper tubes and refrigerant though the carbon steel shell
Refrigerant Circuit
Each refrigerant circuit shall be constructed of copper tubing with brazed joints, and shall include: filter drier, solenoid valve, sight glass, thermal expansion valve, with external equalizer. The entire suction line shall be insulated.
Control Center
The control center shall be NEMA-1 type for indoor models and weatherproof for outdoor models.
All power starting and safety/operating controls shall be mounted in a fully enclosed control panel with access door
Power controls shall include:
•Single point electrical terminal block
•Compressor-motor contactor(s)
•Compressor run capacitor(s)
•Fan motor contactor(s) (air cooled units only)
•Control circuit fuse
•Control circuit terminal block
Safety/Operating controls shall include:
•Two position switch indicating off/system on – per circuit
•High Pressure control with manual reset –per circuit
•Low pressure control with auto reset – per circuit
•Adjustable chilled water temperature controller
•Adjustable freezestat
•Adjustable compressor anti-recycle timer(s)
•Relay(s)
•Built-in compressor-motor overload
Available Factory Supplied Accessories
Control Transformer Factory mounted transformer converts unit power to control voltage for single point electrical (115, 240 or 24 volt). Flow Switch Factory mounted and wired to the control panel.
Chilled Water Pump Package Factory mounted and wired chilled water pump with starter in the control panel and interlocked with flow switch.
MicroProcessor Controls State-of-the-art microprocessor. Operating Gauges Suction and discharge gauges factory installed and piped to each compressor.
Indicating Lights are wired and mounted on control panel. Lights furnished for Power On, High Pressure and No Flow/Freeze. Vibration Isolators Level adjusting spring type 1” deflection or Neoprene pads, shipped loose.
Low Ambient Accessory (Air Cooled Models Only) Standard unit will operate down to 45°F. Unit will operate down to 0°F with this factory- mounted accessory of fan speed control, or add low ambient to –20°F. Non-Fused Disconnect Switch Factory mounted and wired to control panel. NEMA 3R for air cooled, NEMA 1 for water cooled.
Blygold Coated Condenser Copper tube/aluminum fin or copper tube/copper fin coated with Blygold.
Heresite Coated Condenser phenolic corrosion resistant coating for copper tube and aluminum fin coil or copper/copper coil.
Copper Fin Condenser Coil Copper fin condenser coils.
Sound Attenuator consists of sound absorbing material that surrounds compressor. Factory installed.
Dual Unit Kit allows operation of two or more units with parallel or series water circuit. Field mounted.
Alarm Bell Contacts allows alarm bell connection to pressure controls for signaling if unit fails on manual reset controls.
Water Flange Kit Factory or field mounted consists of 150 lb raised flanges to convert to flanged cooler connections.
High Return Water Thermostat Factory mounted thermostat senses high return water temperature at start-up. Allows unit to run un-loaded instead of shutting down due to high head pressure.
Desuperheaters Provides “free hot water” by recovering heat from superheated gas.
Compressor Cycle Counter/Hour Meters Cycle counter and hour meter.
Remote Display Panel allows operator to monitor and control chiller operation from a remote location.
