Technical Guide Form UTG-0204
Continental Chillers LLC
Phone: 317-337-9813 Fax: 317-337-9816
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
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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
•
•
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
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.
Control Center
Scroll Compressor(s)
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.
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.
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
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
Safety/Operating controls include:
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
•
•
•
•
•
•
•
•
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
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.
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.
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.
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.
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)
3
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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.
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
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.
24. Brine Chilling
brines/glycols/alcohols.
-
Modified cooler and controls for various
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.
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.
26. Potable/Ingredient Water at 34°F
applications.
-
For bakeries/produce or other
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
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.
31. Compressor Cycle Counter/Hour Meters
32. Non-Ozone Depleting, Environmentally-Friendly Refrigerant
Ratings and Selection Procedures
Altitude: Ratings are based on altitude of sea level. For other ratings use the following
correction factors
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.
Alt. Above
Sea Level
Sea Level
1000
Capacity
Multiplier
1.0
Alt. Above
Sea Level
4000
Capacity
Multiplier
.971
1.0
5000
.962
3. Cooler Fouling Factor: 0.00025 fouling is standard
2000
.995
6000
.951
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
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: [email protected]
5. Copper Fin Ratings: TR x 1.01 – kW x 0.99
6. Ethylene Glycol Correction Factors: Following factors are to be applied
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
to the standard ratings for ethylene glycol. For other glycols consult factory.
Correction Factors
% Wt.
Ethylene
Glycol
Freeze
Point
(°F)
GPM/
°F /Ton
24.1
Tons
.995
.990
.980
.975
.960
kW
VP
1.02
1.05
1.10
1.13
1.18
10
20
30
40
50
1.000
0.995
.990
0.985
0.980
26
16
5
-10
-32
24.8
26.0
27.3
29.0
Temp. Rise(Vt)
4
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Continental Single Phase Chillers
Single Phase Air Cooled Ratings
UniPac™
Models USAC-3 through USAC-20
3 through 20 Tons
Ambient Air Temperature °F
LCWT Model
85
95
105
115
120
°F
USAC
Cooler
GPM
Cooler
GPM
Cooler
GPM
Cooler
GPM
Cooler
GPM
TR
kW
TR
kW
TR
kW
TR
kW
TR
kW
3
5
2.6
4.3
3.0
5.0
6.2
10.3
20.6
2.3
3.9
3.1
5.2
5.5
9.4
2.1
3.5
3.2
5.4
5.0
8.4
1.8
3.0
3.3
5.5
4.3
7.2
1.6
2.8
3.3
5.8
3.8
6.7
10
15
20
3
8.6 10.0
13.0 15.0
17.2 20.0
7.8 10.4
18.7
7.0 10.8
16.8
25.2
6.0 11.0
9.0 16.5
14.4
21.6
5.6 11.6
8.4 9.9
13.4
20.2
26.9
4.3
40
31.2 11.7 15.6
41.3 15.2 20.8
28.1 10.5 16.2
36.5 14.0 21.6
33.6 12.0 22.0
28.8 11.2 23.2
2.9
4.6
3.0
5.1
7.0
11.0
22.1
2.5
4.1
3.2
5.3
6.0
9.8
2.2
3.7
3.2
5.5
5.3
8.9
2.0
3.3
3.4
5.7
4.8
7.9
1.8
3.0
3.4
5.8
5
7.2
10
15
20
3
9.2 10.2
13.8 15.3
18.4 20.4
8.2 10.6
19.7
7.4 11.0
17.8
26.6
6.6 13.7
9.9 17.1
15.8
23.8
6.0 11.6
9.0 17.4
14.4
21.6
28.8
4.6
42
44
45
46
48
50
33.1 12.3 15.9
44.2 16.4 21.2
29.5 11.1 16.5
39.4 14.8 22.0
35.5 13.2 27.4
31.7 12.0 23.2
3.1
4.9
3.1
5.2
7.4
11.8
23.5
2.8
4.4
3.3
5.4
6.7
10.6
21.1
2.4
4.0
3.4
5.7
5.8
9.6
2.1
3.5
3.5
5.9
5.0
8.4
1.9
3.2
3.5
5.9
5
7.7
10
15
20
3
9.8 10.4
14.7 15.6
19.6 20.8
8.8 10.8
8.0 11.4
19.2
7.0 11.8
16.8
25.2
6.4 11.8
9.6 17.7
15.4
23.0
30.7
4.7
35.3 13.2 16.2
47.0 17.6 21.6
31.7 11.1 16.5
42.2 16.0 22.8
26.6 10.5 17.7
38.4 14.0 23.6
33.6 12.8 23.6
3.2
5.0
3.1
5.2
7.6
11.9
23.8
2.9
4.5
3.3
5.5
6.8
10.8
21.6
2.5
4.1
3.5
5.8
6.0
9.8
2.1
3.6
3.6
6.0
5.0
8.6
2.0
3.3
3.6
6.0
5
7.9
10
15
20
3
9.9 10.4
14.8 15.6
19.9 20.8
9.0 10.9
8.2 11.5
19.7
7.3 11.9
17.5
25.9
6.6 12.0
9.9 18.0
15.8
23.8
31.7
4.8
35.5 13.3 16.4
47.8 18.0 21.8
31.9 11.8 17.0
43.2 11.9 20.1
28.3 10.8 17.8
28.6 14.4 23.8
34.6 13.2 24.0
3.2
5.0
3.1
5.2
7.7
12.0
24.0
2.9
4.6
3.3
5.5
7.0
11.0
22.1
2.6
4.2
3.5
5.8
6.2
10.1
20.2
2.2
3.7
3.6
6.0
5.3
8.9
2.0
3.4
3.6
6.1
5
8.2
10
15
20
3
10.0 10.4
15.0 15.6
20.0 20.8
9.2 11.0
8.4 11.6
7.4 12.0
17.8
6.8 12.2
16.3
24.5
32.6
5.3
36.0 13.4 16.5
48.0 18.4 22.0
32.2 12.6 17.4
44.2 16.8 23.2
30.2 11.1 18.0
40.3 14.8 24.0
26.6 10.2 18.3
35.5 13.6 24.4
3.4
5.2
3.2
5.3
8.2
12.5
25.0
3.0
4.8
3.4
5.6
7.2
11.5
23.0
2.7
4.3
3.5
5.9
6.5
10.3
20.6
2.4
3.9
3.7
6.1
5.8
9.4
2.2
3.6
3.7
6.2
5
8.6
10
15
20
3
10.4 10.6
15.6 15.9
20.8 21.7
9.6 11.2
8.6 11.8
7.8 12.2
18.7
7.2 12.4
17.3
25.9
51.8
5.5
37.4 14.4 16.8
49.9 19.2 22.4
34.6 12.9 17.7
46.1 17.2 23.6
31.0 11.7 18.3
41.3 15.6 37.6
28.1 10.8 18.6
37.4 21.6 37.2
3.5
5.4
3.2
5.4
8.4
3.2
5.0
3.4
5.7
7.7
12.0
24.0
2.8
4.5
3.6
6.0
6.7
10.8
21.6
2.5
4.1
3.7
6.2
6.0
9.8
2.3
3.8
3.8
6.3
5
13.0
9.1
10
15
20
10.8 10.8
16.2 16.2
21.6 21.6
25.9 10.0 11.4
38.9 15.0 17.1
51.8 20.0 22.8
9.0 12.0
8.2 12.4
19.7
7.6 12.6
18.2
27.4
36.5
36.0 13.5 18.0
48.0 18.0 24.0
32.4 12.3 18.6
43.2 16.4 24.8
Compressor power input
29.5 11.4 18.9
39.4 15.2 25.2
LCWT: Leaving chilled water temperature, °F
TR: Tons of refrigeration cooling capacity
kW:
Cooler GPM:
Flow rate in US GPM for cooler
5
Phone: 317-337-9813
Fax: 317-337-9816
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Continental Single Phase Chillers
Single Phase Air Cooled Ratings
UniPac™
Models USAC-25 through USAC-60
25 through 60 Tons
Ambient Air Temperature °F
LCWT Model
85
95
105
115
120
°F
USAC
Cooler
GPM
Cooler
GPM
Cooler
GPM
Cooler
GPM
Cooler
GPM
TR
kW
TR
kW
TR
kW
TR
kW
TR
kW
25
30
40
50
60
25
30
40
50
60
25
30
40
50
60
25
30
40
50
60
25
30
40
50
60
25
30
40
50
60
25
30
40
50
60
21.5 25.0
25.8 30.0
34.4 40.0
13.0 50.0
51.6 60.0
23.0 25.5
28.0 31.0
37.0 41.0
46.0 51.0
55.0 61.0
24.5 26.0
29.4 31.2
39.0 41.6
49.0 52.0
59.0 62.4
24.7 26.0
29.7 31.2
39.5 41.6
49.5 52.0
59.5 62.4
25.0 26.0
30.0 31.2
40.0 41.6
50.0 52.0
60.0 62.4
26.0 26.5
31.0 32.0
42.0 43.0
52.0 53.0
62.4 36.6
27.0 27.0
32.4 32.4
43.0 43.0
54.0 54.0
64.8 64.8
51.6 19.5 26.0
61.9 23.4 31.2
82.6 31.2 41.6
31.2 39.0 52.0
123.8 47.0 63.0
55.2 20.5 26.5
67.2 25.0 32.0
88.8 33.0 43.0
110.4 41.0 53.0
132.0 49.0 63.6
58.8 22.0 27.0
70.6 26.4 32.4
93.6 35.0 43.0
117.6 44.0 54.0
141.6 53.0 65.0
59.3 22.5 27.3
71.3 27.2 32.7
94.8 36.0 43.5
118.8 45.0 54.5
142.8 54.1 65.5
60.0 23.0 27.5
72.0 28.0 33.0
96.0 37.0 44.0
120.0 46.0 55.0
144.0 55.2 66.0
62.4 24.0 28.0
74.4 29.0 34.0
100.8 38.0 45.0
124.8 48.0 56.0
149.8 57.6 67.2
64.8 25.0 28.5
77.8 30.0 34.0
103.2 40.0 46.0
129.6 50.0 57.0
155.5 60.0 68.4
46.8 17.5 27.0
56.2 21.0 32.4
74.9 28.0 43.0
93.6 35.0 54.0
112.8 42.0 65.0
49.2 18.5 27.5
60.0 22.0 33.0
79.2 30.0 44.0
98.4 37.0 55.0
117.6 44.0 66.0
52.8 20.0 38.5
63.4 24.0 34.2
84.0 32.0 46.0
105.6 40.0 57.0
127.2 48.0 68.4
54.0 20.5 28.7
65.3 24.5 34.6
86.4 33.0 46.1
108.0 41.0 57.5
129.8 49.2 69.0
55.2 21.0 29.0
67.2 25.0 35.0
88.8 34.0 46.0
110.4 42.0 58.0
132.5 50.4 69.6
57.6 21.5 29.5
69.6 26.0 35.4
91.2 34.4 47.2
115.2 43.0 59.0
138.2 51.6 70.8
60.0 22.5 30.0
72.0 27.0 36.0
96.0 36.0 48.0
120.0 45.0 60.0
144.0 54.0 72.0
kW:
42.0 15.0 27.5
50.4 18.0 33.0
67.2 24.0 44.0
84.0 30.0 55.0
100.8 36.0 66.0
44.4 16.5 28.5
52.8 20.0 34.0
72.0 26.4 45.6
88.8 33.0 57.0
105.6 39.6 68.4
48.0 17.5 29.5
57.6 21.0 35.4
76.8 28.0 47.0
96.0 35.0 59.0
115.2 42.0 71.0
49.2 18.0 29.7
58.8 21.5 35.7
79.2 29.0 47.5
98.4 36.0 59.5
118.1 43.2 71.5
50.4 18.5 30.0
60.0 22.0 36.0
81.6 30.0 48.0
100.8 37.0 60.0
121.0 44.4 72.0
51.6 19.5 30.5
62.4 23.4 36.6
82.6 31.2 49.0
103.2 39.0 61.0
123.8 46.8 73.2
54.0 20.5 31.0
64.8 25.0 37.0
86.4 33.0 50.0
108.0 41.0 62.0
129.6 49.2 74.4
Compressor power input
36.0 14.0 29.0
43.2 17.0 35.0
57.6 22.4 46.4
72.0 28.0 58.0
86.4 33.6 69.6
39.6 15.0 29.0
48.0 18.0 35.0
63.4 24.0 30.0
79.2 30.0 58.0
95.0 36.0 69.6
42.0 16.0 29.5
50.4 19.2 35.4
67.2 26.0 47.0
84.0 32.0 59.0
100.8 38.4 71.0
43.2 16.5 30.3
51.6 19.6 36.2
69.6 26.5 48.0
86.4 33.0 60.0
103.7 39.7 72.1
44.4 17.0 31.0
52.8 20.0 37.0
72.0 27.0 49.0
88.8 34.0 61.0
106.6 41.0 73.2
46.8 18.0 31.0
56.2 21.6 37.0
74.9 29.0 49.6
93.6 36.0 62.0
112.3 43.2 74.4
49.2 19.0 32.0
60.0 23.0 38.0
79.2 30.4 50.4
98.4 38.0 63.0
118.1 45.6 75.6
33.6
40.8
53.8
67.2
80.6
36.0
43.2
57.6
72.0
86.4
38.4
46.1
62.4
76.8
92.2
39.6
47.0
63.6
79.2
95.3
40.8
48.0
64.8
81.6
98.4
43.2
51.8
69.6
86.4
103.7
45.6
55.2
73.0
91.2
109.4
40
42
44
45
46
48
50
LCWT: Leaving chilled water temperature, °F
TR: Tons of refrigeration cooling capacity
Cooler GPM:
Flow rate in US GPM for cooler
6
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Continental Single Phase Chillers
Single Phase Water Cooled Ratings
UniPac™
Models USWC-3 through USWC-60
3 through 60 tons
Condenser Leaving Water Temperature, °F
LCWT Model
85
Cooler Cond
GPM GPM
95
Cooler Cond
GPM GPM
100
Cooler
GPM
°F
USWC
Cond
GPM
TR
kW
TR
kW
TR
kW
3
3.0
3.0
7.2
9.0
2.8
3.0
6.7
8.4
2.6
3.0
6.2
7.8
5
5.0
10.0
15.0
20.0
25.0
30.0
40.0
50.0
60.0
3.5
5.0
10.0
15.0
20.0
25.0
30.0
40.0
50.0
60.0
3.1
12.0
24.0
36.0
48.0
60.0
72.0
96.0
120.0
144.0
8.4
15.0
30.0
4.7
9.3
5.0
10.0
15.0
20.0
25.0
30.0
40.0
50.0
60.0
3.1
11.3
22.3
33.6
44.6
55.9
67.0
89.3
111.6
133.9
7.9
14.1
27.9
42.0
55.8
69.9
83.7
111.6
139.5
167.4
9.9
4.3
8.6
5.0
10.0
15.0
20.0
25.0
30.0
40.0
50.0
60.0
3.1
10.3
20.6
31.2
41.3
51.6
61.9
82.6
103.2
123.8
7.4
12.9
25.8
39.0
51.6
64.5
77.4
103.2
129.0
154.8
9.3
10
15
20
25
30
40
50
60
3
45.0
14.0
18.6
23.3
27.9
37.2
46.5
55.8
3.3
13.0
17.2
21.5
25.8
34.4
43.0
51.6
3.1
60.0
40
75.0
90.0
120.0
150.0
180.0
10.5
5
5.4
5.2
13.0
25.9
38.9
51.6
64.8
78.0
103.7
129.6
154.8
9.6
16.2
5.2
5.2
12.5
24.7
37.2
49.4
61.9
74.4
98.6
123.6
148.3
8.9
15.6
30.9
46.5
61.8
77.4
93.0
123.3
154.5
185.4
11.1
16.5
41.4
49.5
65.7
82.5
99.0
132.6
165.0
197.1
4.9
5.2
11.8
23.5
35.3
47.0
58.8
70.6
93.6
117.6
141.6
8.2
14.7
29.4
44.1
58.8
73.5
88.2
117.0
147.0
177.0
10.2
15.6
31.2
46.8
62.4
78.0
93.0
126.0
156.0
187.2
10
15
20
25
30
40
50
60
3
10.8
16.2
21.5
27.0
32.5
43.2
54.0
64.5
4.0
10.4
15.6
20.8
26.0
31.2
41.6
52.0
62.4
3.2
32.4
10.3
15.5
20.6
25.8
31.0
41.1
51.5
61.8
3.7
10.4
15.6
20.8
26.0
31.2
41.6
52.0
62.4
3.2
9.8
10.4
15.6
20.8
26.0
31.2
41.6
52.0
62.4
3.2
48.6
14.7
19.6
24.5
29.4
39.0
49.0
59.0
3.4
64.5
44
81.0
97.5
129.6
162.0
193.5
12.0
5
5.8
5.3
13.9
27.8
41.8
55.2
69.6
84.0
111.4
139.2
165.6
17.4
5.5
5.3
13.2
33.1
39.6
52.6
66.0
79.2
106.1
132.0
157.7
5.2
5.3
12.5
25.0
37.4
49.9
62.4
74.4
100.8
124.8
149.8
10
15
20
25
30
40
50
60
11.6
17.4
23.0
29.0
35.0
46.4
58.0
69.0
10.6
15.9
21.7
26.5
32.0
43.0
53.0
63.6
34.8
13.8
16.5
21.9
27.5
33.0
44.2
55.0
65.7
10.6
15.9
21.7
26.5
32.0
43.0
53.0
63.6
10.4
15.6
20.8
26.0
31.0
42.0
52.0
62.4
10.6
15.9
21.7
26.5
32.0
43.0
53.0
63.6
52.2
69.0
48
87.0
105.0
139.2
174.0
207.0
LCWT: Leaving chilled water temperature, °F
TR: Tons of refrigeration cooling capacity
kW:
Compressor power input
Cooler GPM:
Cond GPM:
Flow rate in US GPM for cooler
Flow rate in US
7
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Continental Single Phase Chillers
UniPac™
USAC Physical Data
USAC-3, 4, 5, 8
USAC-10, 12, 15, 20
USAC-25, 30
USAC-40, 50, 60
Dimensions
Water Connections
Est R-22
Charge, lbs.
9/11
12/18
22/25/30/40
50/60
Model USAC
Weight, lbs.
L”
48
48
90
120
90
W”
43
43
43
43
86
86
H”
53
53
55
55
55
55
Inlet, MPT”
Outlet, MPT”
-3, 4
-5, 8
-10, 12, 15, 20
-25, 30
-40
500/600
650/900
¾
1
2
3
4
4
¾
1
2
3
4
4
1,100/1,300/1,500
2,000/2,300
3,000
4,000/4,500
85
110/140
-50, 60
120
8
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Continental Single Phase Chillers
UniPac™
USWC Physical Data
USWC-3, 5, 10
USWC-15, 20
USWC-25, 30
Water Connections,
Inlet”/Outlet”
Dimensions
Est R-22
Charge, lbs.
Model USWC
Weight, lbs.
L”
W”
34
34
34
34
H”
48
48
48
48
Condenser
Cooler
-3, 5
-10
-15, 20
-25, 30
20
20
48
84
400/500
700
900/1,000
1,200/1,600
¾
1
¾
1
7/14
24
40/55
65/80
1 ½
2
1 ½
2
For models larger than USWC-30, please contact the factory for data
9
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Continental Single Phase Chillers
UniPac™
Electrical Data
USAC Packaged Air Cooled Chillers
Total Unit
Compressor Motor Data
Condenser Fan Motor Data
Standard Unit
Optional Low Ambient Unit
Single Phase/Single
Speed Motor
Single Phase/Speed
Control
Model
Max
Fuse
Rec.
Fuse
HP
Each
RLA
Each
LRA
Each
MCC
Each
MCA
Qty
HP
Each
FLA
Each
Qty
HP
RLA
HP
RLA
Qty
Qty
Each Each
Each Each
30
33
45
55
35
40
1
1
3
4
5
4
5
4
5
5
5
5
5
5
5
18.4
22.1
32.1
22.1
32.1
22.1
32.1
32.1
32.1
32.1
32.1
32.1
32.1
95
25.8
31
45
31
45
31
45
45
45
45
45
45
45
1
1
1
1
2
2
2
2
2
2
4
4
4
0.75
0.75
0.75
0.75
0.75
0.75
0.75
0.75
1.5
5.3
5.3
5.3
5.3
5.3
5.3
5.3
5.3
6.6
6.6
5.3
6.6
6.6
_
_
_
_
1
1
1
1
1
1
2
2
2
_
_
1
1
1
1
1
1
1
1
1
1
2
2
2
0.75
0.75
0.75
0.75
0.75
0.75
0.75
0.75
1.5
5.3
5.3
5.3
5.3
5.3
5.3
5.3
5.3
6.6
6.6
5.3
6.6
6.6
USAC-3
USAC-4
137
148
137
148
137
148
148
148
148
148
148
148
_
_
45
77
55
1
_
_
USAC-5
55
77
60
2
_
_
USAC-8
83
115
105
150
180
215
250
325
390
450
90
2
0.75
0.75
0.75
0.75
1.5
1.5
0.75
1.5
1.5
5.3
5.6
5.3
5.3
6.6
6.6
5.3
6.6
6.6
USAC-10
USAC-12
USAC-15
USAC-20
USAC-25
USAC-30
USAC-40
USAC-50
USAC-60
83
88
3
115
150
185
220
290
350
420
125
160
200
230
300
370
430
3
4
5
6
1.5
1.5
8
0.75
1.5
0.75
1.5
10
12
1.5
1.5
Electrical Data
USWC Packaged Water Cooled Chillers
Total Unit
Compressor Motor Data
Model
MCA
25
Max Fuse
40
Rec. Fuse
30
Qty
1
HP Each
RLA Each
18.4
22.1
32.1
22.1
32.1
22.1
32.1
32.1
32.1
32.1
32.1
32.1
32.1
LRA Each
95
MCC Each
3
4
5
4
5
4
5
5
5
5
5
5
5
25.8
31
45
31
45
31
45
45
45
45
45
45
45
USWC-3
USWC-4
28
50
35
1
137
148
137
148
137
148
148
148
148
148
148
148
40
72
50
1
USWC-5
50
72
55
2
USWC-8
72
104
95
80
2
USWC-10
USWC-12
USWC-15
USWC-20
USWC-25
USWC-30
USWC-40
USWC-50
USWC-60
72
77
3
104
136
169
200
265
330
395
106
169
200
233
297
360
425
115
145
175
200
275
360
400
3
4
5
6
8
10
12
Notes:
1. All units have across-the-line start.
2. RLA (rated load amps) rated in accordance with ARI Standard.
3. MCA (minimum circuit amps) equal 125% of the RLA for the largest motor in the circuit plus 100% of the RLA for all other motors in the circuit per N.E.C.
4. Based on copper conductors with 75° C insulation per N.E.C. Table 310-16.
5. Max fuse size is based on 225% of the RLA for the largest motor in the circuit plus 100% of the RLA for all other motors in the circuit per N.E.C. This is the
largest fuse allowed per N.E.C. A smaller fuse is often recommended based on the unit application and ambient temperature.
10
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Continental Single Phase Chillers
UniPac™
Installation and Application Data
4. For multiple units, a minimum lateral clearance of 10 feet between
two units is recommended.
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.
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.
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.
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.
The following guidelines are recommended:
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.
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.
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
Foundation
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.
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.
Corrosive Atmosphere Operation
Continental offers the following choices of condenser coil
combinations for various corrosive atmospheres.
(b)
Roof-top Rooftop installations will require consideration by an
Blygold or Heresite coating for aluminum fins; Copper Fins with
Blygold or Heresite coating or complete unit coated with Blygold, Imron
or Heresite.
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.
Field Electric Wiring
Clearances
All field wiring must be in accordance with applicable local/national
codes and ordinances
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.
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.
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.
Remote chilled water set point option is available- see under
options.
11
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Continental Single Phase Chillers
UniPac™
UniPac™Guide Spec
All power starting and safety/operating controls shall be mounted
in a fully enclosed control panel with access door
Power controls shall include:
Furnish and install where indicated on plans Qty______
Continental UniPac™ model (USAC, USWC) _________
packaged liquid chiller(s).
•
•
•
•
•
•
Single point electrical terminal block
Compressor-motor contactor(s)
Compressor run capacitor(s)
Fan motor contactor(s) (air cooled units only)
Control circuit fuse
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.
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
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.
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.
All units shall include the following:
MicroProcessor Controls State-of-the-art microprocessor.
Operating Gauges Suction and discharge gauges factory installed
and piped to each compressor.
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.
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.
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.
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.
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.
Dual Unit Kit allows operation of two or more units with parallel or
series water circuit. Field mounted.
Condenser – Water Cooled
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.
The condenser shall be shell and coil type with water flowing
through seamless copper tubes and refrigerant though the carbon
steel shell
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.
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.
Continental Chillers LLC
Phone: 317-337-9813
Fax: 317-337-9816
Email: [email protected]
PO Box 781555 – Indianapolis, IN 46278 USA
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