Continental CAD-20, USAC-8, CDX-20, USC-20, USWC-30, USA-20, USAC-40 Installation and Application Data

Continental Single Phase Chillers UniPac™

Installation and Application Data

General

Continental UniPac™ Air Cooled Packaged Chillers models USAC are designed for outdoor installations and normal exposure to summer and winter conditions. The vertical condenser air discharge feature allows rooftop or ground installations. Horizontal units are also available.

The enclosure door is provided to protect the electrical components against unauthorized access. However, consideration should be given to a field-installed protective fence to further reduce possibility of accidental damage or unauthorized entry, especially for ground level installations. Field installed fence must have a minimum of 50% open area.

Continental UniPac™ Water Cooled Packaged Chillers models USWC ar designed for indoor installations and normal indoor conditions.

However, if outdoor installation is required, the factory option of a complete unit enclosure and heater tape with thermostat for the cooler and condenser must be ordered.

The following guidelines are recommended:

Location for Air Cooled Systems

1.Whether it is a rooftop or ground level installation, select a place with unrestricted fresh air supply for the air cooled condenser and minimum sun exposure.

2.Avoid locations between structures, beneath windows, or any other restriction that may affect adequate air supply to the condenser and where normal operating sounds may be objectionable.

3.The condenser fans are propeller type and are not designed for use with duct work

Location for Water Cooled Systems

1.The preferred location for the water cooled system is a proper plant room with at least 4ft access on all four sides.

Foundation

All chillers should be mounted on a flat and level foundation, ground, or rooftop, capable of supporting the total operating weight of the unit and service personnel.

(a)Ground Level It is important that the units be installed on a substantial base that will not settle, causing strain on the liquid lines, resulting in possible leaks. Mounting holes (9/16”) are provided in the unit steel channels for bolting the unit to its foundation. An independent one-piece concrete slab, not tied to the main building and with footers extended below the frost line, is recommended.

(b)Roof-topRooftop installations will require consideration by an architect and contractor to have adequate structural strength to safely support the entire operating weight of the unit and service personnel. Structurally transmitted vibration and sound must be avoided by mounting the unit on proper isolators.

4.For multiple units, a minimum lateral clearance of 10 feet between two units is recommended.

Field Piping

1.If a circulating pump is field furnished, the pump must discharge into the cooler first and then through the cooler to the system.

2.Provide stop valves on all inlet and outlet piping to facilitate servicing.

3.Provide drain connections at low points to permit drainage of cooler and field piping.

4.Provide air vents at high points easily accessible for servicing

5.Provide a strainer on the inlet to the cooler.

6.Provide wall hangers and rubber isolated piping hangers to reduce sound and vibration transmission though liquid piping.

7.Provide thermometers and pressure gauges for installation in the inlet and outlet water lines. These items are available as optional features and are not included in the standard unit.

8.Chilled water lines should be insulated to reduce heat pick up and prevent condensation.

9.For winter low ambient operation, it is recommended that a heater cable of 4 watts per lineal foot of pipe be installed, and exposed lines be properly insulated to protect against freeze conditions.

10.Flush all chilled water piping prior to final connection to the UniPac™ chiller systems.

Water Treatment

Adequate water treatment should be determined locally, depending on the local water quality and the type of system. Any foreign material or dirt in the water system can adversely affect the performance of the UniPac™ unit.

Freeze Protection

Continental recommends use of a premixed glycol (Propylene or Ethylene) or HVAC heat transfer fluids. Contact factory for more details. Automotive antifreeze is not recommended because these often include silicates. Silicates end up coating the heat transfer surface reducing efficiency, fouling the system and shortening the life of the pump seals.

Corrosive Atmosphere Operation

Continental offers the following choices of condenser coil combinations for various corrosive atmospheres.

Blygold or Heresite coating for aluminum fins; Copper Fins with Blygold or Heresite coating or complete unit coated with Blygold, Imron or Heresite.

Clearances

1.Air cooled systems draw air from all sides; therefore units must be installed with sufficient clearances for air entrance to the condenser coil, for air discharge away from the condenser, and for servicing. Minimum clearances for all units are 4 feet on all sides.

2.In installations where winter operation is intended and snow accumulations are expected, additional height must be provided in order to insure normal condenser airflow.

3.When free airflow to the condenser is reduced or restricted, condenser air may be recirculated, considerably reducing system capacity and increasing power consumption. All ratings are based on

free air discharge. 11

Field Electric Wiring

All field wiring must be in accordance with applicable local/national codes and ordinances

Continental chiller systems are factory wired for optimum reliability. Controls are factory set for the operating conditions. These controls must not be field modified without written consent from Continental; otherwise the warranty is voided. The use of a simple remote switch or timer is permitted but it must be connected to the Continental control panel at points specifically indicated for that purpose.

Remote chilled water set point option is available- see under options.

Phone: 317-337-9813	www.continentalchillers.com
Fax: 317-337-9816