Continental USAC-40, CAD-20, USA-20, CDX-20, USAC-8 User Manual

Technical Guide Form UTG-0204

Continental Chillers LLC

Phone: [phone] Fax: [phone]

www.continentalchillers.com

™

UniPac

Single Phase

Air Cooled Chillers

Water Cooled Chillers

Split System Chillers

3 through 60 HP

Shown, model USAC-8

Packaged Air Cooled Chiller with

Factory Mounted Chiller Pump

Typical Scroll

Compressor

Continental Single Phase Chillers

Introducing UniPac™ Chiller Systems

All over the world, Continental has successfully
developed and marketed various packaged and split
chillers to serve many needs. For several years
discerning Engineers, Contractors, and Owners have
expressed a desire to specify, install and own
Unique Single Phase quality chillers in sizes ranging
from 3 to 60 HP.

This need is being fulfilled by Continental’s line of
UniPac™ Chillers.

To order Packaged Air Cooled Chiller:

Use model USAC

To order Packaged Water Cooled Chiller:

Use model USWC

*For 4, 8, 12 Ton Ratings, Contact Factory
Ordering Examples: 40 ton packaged Single Phase Air Cooled Chiller, model USAC-40

Packaged Air Cooled and

Water Cooled Systems

To order Split (A)

Compressor, Chiller, Control Panel – model
USC with matching Outdoor Air Cooled
Condenser – model CAD
To order Split (B)

Compressor/Condenser (Condensing Unit)
Outdoor – model USA with matching Indoor
Chiller – model CDX

UNIPAC™ NOMENCLATURE

Packaged Air Cooled and Water Cooled Chiller Systems

U S AC or WC – X

U Unique
S Scroll

AC Condenser – Air Cooled

WC Condenser – Water Cooled

X

30 ton packaged Single Phase Water Cooled Chiller, model USWC-30
20 ton split Single Phase Air Cooled Chiller, option A, models USC-20 (indoor compressor/chiller) and CAD-20 (outdoor A/C condenser)
20 ton split Single Phase Air Cooled Chiller, option B, models USA-20 (outdoor condensing unit) and CDX-20 (indoor chiller)

3, 4*, 5, 8*,10,12*,15, 20, 25, 30, 40, 50, 60

Nominal Horse Power -

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UniPac™

UniPac™ chillers have a full compliment of factory
installed and wired optional accessories. These
accessories can save several hundreds of dollars in field
labor and material, resulting in cost effective installation.

Packaged UniPac™ chillers are factory tested and
shipped with a vapor charge of R-22.

Split UniPac™ chillers are “dry run” tested for
functional tests and shipped with dry air or nitrogen for
field piping evacuating and refrigerant charging.

Split Air Cooled Systems

Phone: [phone] www.continentalchillers.com

Fax: [phone]

Continental Single Phase Chillers

UniPac™

Standard Unit Specifications of UniPac™ Single Phase Chillers

General Description

Continental’s Single Phase Air and Water Cooled Chillers

are packaged systems complete with scroll compressor(s), air
cooled or water cooled condenser(s), individual
cooler/evaporator(s), independent refrigerant circuit(s) and a control
center all mounted on a heavy duty structural steel frame.

Scroll Compressor(s)

Compressors are well proven state-of-the-art scrolls with fewer
moving parts, less rotating mass, and less internal friction than
traditional reciprocating compressors.

Motor is suction gas-cooled, hermetically sealed, two pole,
squirrel cage induction type and is directly driven at 3600 rpm.

All compressor(s) are mounted on resilient pads to minimize
vibration.

Air Cooled Condenser for Air Cooled Models

Condenser Coil-industrial quality, seamless copper tube
Fins-all aluminum, die formed with full self–spacing collars that

completely cover the copper tube; fins are mechanically bonded to
the copper tubes
Propeller Fans-large surface, low speed, low sound level propeller
fans for vertical airflow; fans are statically and dynamically balanced
and operate at low tip speeds for low vibration and sound levels

Fan Guards- PVC coated for long life
Fan Venturi- high collar fully spun venturi design for high efficiency

and low outlet noise
Fan Motors-special “enclosed air over” motor design with built-in
overload protection; single phase motors operate at a low speed of
1075 rpm

Water Cooled Condenser for Water Cooled Models

Each water cooled condenser is of shell/coil design. The
condenser water flows through special heat transfer copper tube.
Refrigerant flows through the steel shell and a built in receiver.

Cooler/Evaporator for All Models

Each cooler/evaporator is of shell/coil design. The water to be
chilled flows through special heat transfer copper tube. Refrigerant
flows through the steel shell/receiver.

Refrigerant Piping

Each Refrigerant circuit includes:

• Liquid line with charging connection

• Filter drier

• Liquid solenoid valve with 115 V coil (220 V or 24 V, optional)

• Sight glass/ moisture indicator

• Suction line fully insulated, designed for proper oil return at

minimum friction loss

• Discharge line formed of clean ACR type tubing and pre-formed
radius fitting

Control Center

All power, starting, safety and operating controls are mounted in

a built in fully enclosed, weather proof control panel for air cooled
models and NEMA-1 enclosures for indoor water cooled or
condenserless models.

Power controls include:

• Single point electrical terminal block for 230/1/60 power input

• 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 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

Testing, Evacuation and Refrigerant Charging

Each completed system is pressure tested with nitrogen,

evacuated with a high capacity vacuum pump, vapor charged with
R-22 and fully tested for all operating and safety controls. Field
charge of R-22 required.

Split chiller systems are “dry run” tested for operating and

safety controls.

Assembly

All above components are assembled on a heavy-duty

structural steel frame, formed of channels and angles as a rugged
pre-engineered package. Each steel frame has mounting holes and
“lifting eyes” on four sides for “spreader bar” lifting and rigging.

The cabinet of air cooled units is made of heavy gauge

galvanized steel.

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Phone: [phone] www.continentalchillers.com

Fax: [phone]

Continental Single Phase Chillers

UniPac™ Options and Selection Procedures

UniPac™

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.

Ethylene

Glycol

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

Tons kW

Correction Factors

VP

GPM/

°F /Ton

Freeze

Point

(°F)

Phone: [phone] www.continentalchillers.com

Fax: [phone]

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

Alt. Above

Sea Level

Sea Level 1.0 4000 .971

1000 1.0 5000 .962
2000 .995 6000 .951
3000 .980 7000 .949

Capacity

Multiplier

Alt. Above

Sea Level

Capacity

Multiplier

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

Tel:[phone] Fax:[phone] E-mail: [e-mail]

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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