Continental CAD-20, USAC-8, CDX-20, USC-20, USWC-30, USA-20 UniPac Options and Selection Procedures

Continental Single Phase Chillers	UniPac™
UniPac™ Options and Selection Procedures

1.Control Transformer - For applications where a separate 115-volt power source is not available, a transformer can be installed and wired between the line voltage power terminal block and the 115-volt control circuit. Transformer primary fuses are included.

2.Factory mounted and wired flow switch - This accessory is mandatory for Continental warranty to be effective. Provides protection from chiller freezing due to “no flow” through chiller-evaporator.

3.Factory Mounted and Wired Chiller Water Pump/Valve - Includes chilled water circulating pump, pump starter, and isolation valve. Provides system pump for chilled water circulation- saves field labor and material. This pump is interlocked with the flow switch and “phased in” at the factory for proper rotation.

4.Non-fused Disconnect - Factory mounted non-fused disconnect sized for model and voltage. This saves field labor and material.

5.Low Evaporator Pressure Freezestat - Senses low evaporator pressure and shuts down system after sixty second time delay. Extra safety protection against low pressure due to gas shortage or freeze conditions.

6.Pressure Gauges - Two-inch diameter gauges are factory installed and piped to compressor. High and low pressure for each refrigerant circuit.

7.Indicator Lights - Three indicating lights show Power On, High Pressure Fail, and No Flow/Freeze for each refrigerant circuit.

8.Vibration Isolators - Level adjusting spring type for one-inch deflection for field mounting-reduces vibration transmission.

9.Low Ambient Controls - Standard units have fan cycling and are good for 45°F ambient.

a) For Low Ambient of 0°F. Includes a modulating solid state fan speed controller and a single phase condenser motor(s) as well as fan cycling.

b) For Low Ambient of –20°F. Includes head pressure control valve in conjunction with oversized heated and insulated receiver(s) and fan cycling. Receiver includes pressure relief valve.

10.Micro-Processor Controller

11.Water Regulating Valve - Provides head pressure control for water cooled models USWC.

12.90/10 Cu-Ni Condenser - For water cooled models, USWC.

13.Blygold or Heresite Coated Condenser - Coil is coated with Blygold or Heresite for protection against elements. Minimal effect on heat transfer.

14.Copper Tube/Copper Fin Condenser Coil - Seamless copper tube with die formed copper fins, mechanically bonded to the tube. Provides maximum protection from salt-water environment due to the elimination of dissimilar metals.

15.Complete Unit Coating - Your choice of paint, Blygold, Imron, polyester or Heresite coating for compete unit.

16.Stainless Steel Hardware - For extra protection against corrosion.

17.Low Speed Condenser Fan Motors - For lower noise levels

18.Centrifugal Condenser Fans - For ducted applications

19.Acoustical Enclosure - Compressor is located in an acoustical enclosure providing dampening of sound levels.

20.Dual Unit Kit - Allows operation of two or more units

21.Alarm Bell Contacts - Allows alarm bell connection to pressure controls for signaling if unit fails on manual reset safety controls. (alarm bell is not included but can be provided)

22.Water Flange Kit - Factory or field mounted consists of 150lb raised face flanges to convert male pipe thread to flanged cooler connections.

23.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

24.Brine Chilling - Modified cooler and controls for various brines/glycols/alcohols.

25.High entering Water Process Cooling - Secondary plate heat exchanger with pump, factory mounted and wired to protect compressor against burnouts due to high water temperatures.

26.Potable/Ingredient Water at 34°F - For bakeries/produce or other applications.

27.Cooler Heater with Thermostat - For freeze protection.

28.Desuperheaters - Provides “free hot water” by recovering heat from super heated gas.

29.Compressor Circuit Breaker - Both fused and non-fused short circuit protection for each compressor, further reducing chance of motor burnout.

30.Digital Temperature Readout

31.Compressor Cycle Counter/Hour Meters

32.Non-Ozone Depleting, Environmentally-Friendly Refrigerant

Ratings and Selection Procedures

1.Ratings: are in accordance with ARI standard for chillers. These ratings may be interpolated for any published chilled water temperatures between 40°F and 50°F but must not be extrapolated.

2.Chilled Water Flow: based on 2.4 GPM per Ton and 10°F chilled water range. Limit 6°F minimum to 14°F maximum.

3.Cooler Fouling Factor: 0.00025 fouling is standard

For 0.0005 fouling capacity correction factor = 0.982 x TR, 0.994 x kW For 0.00075 fouling capacity correction factor = 0.964 x TR, 0.989 x kW

4.Water cooled condenser fouling factor : ratings are based on 0.00025 for condenser. For 0.00075 Condenser tons x 0.97 –kW x 1.045

5.Copper Fin Ratings: TR x 1.01 – kW x 0.99

6.Ethylene Glycol Correction Factors: Following factors are to be applied to the standard ratings for ethylene glycol. For other glycols consult factory.

% Wt.		Correction Factors			Freeze
Ethylene					Point
				GPM/
Glycol	Tons	kW	VP		(°F)
				°F /Ton
10	.995	1.000	1.02	24.1	26
20	.990	0.995	1.05	24.8	16
30	.980	.990	1.10	26.0	5
40	.975	0.985	1.13	27.3	-10
50	.960	0.980	1.18	29.0	-32

Altitude: Ratings are based on altitude of sea level. For other ratings use the following correction factors

Alt. Above	Capacity	Alt. Above	Capacity
Sea Level	Multiplier	Sea Level	Multiplier
Sea Level	1.0	4000	.971
1000	1.0	5000	.962
2000	.995	6000	.951
3000	.980	7000	.949

7.For ratings outside this catalog range consult Continental for assistance

Tel:(317)337-9813 Fax:(317)337-9816 E-mail: sales@continentalchillers.com

Selection Procedures

All units are rated in accordance with ARI Standard and cover a wide range of leaving chilled water temperatures and ambients from 85°F to 120°F.

To select any chiller it is necessary to know:

1.Capacity: ______ Tons

2.Entering and leaving chilled water temperature: ______ °F

3.Water Flow: ______ GPM

4. Design ambient temperature: ______ °F or

5.Entering/leaving cond. water temperature, for water cooled units: ______ °F Knowing any two of items 1,2 or 3, the third can be calculated as follows:

GPM = Tons x 24

Temp. Rise(Vt)

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