Air-Cooled Screw Compressor Chiller Installation, Operation and Maintenance Manual 60 Hertz

Air-Cooled Screw Compressor Chiller Installation, Operation and Maintenance Manual 60 Hertz
Installation, Operation and Maintenance Manual
IOMM ALS
Group: Chiller
Part Number: 070774401
Date: February 1998
Supersedes: IM 548-3
Air-Cooled Screw Compressor Chiller
ALS 070A through 425A
60 Hertz
© 1996 McQuay International
Table Of Contents
Introduction............................. 3
General Description ........................................ 3
Nomenclature................................................... 3
Inspection ........................................................ 3
Installation and Start-up............ 3
Handling........................................................... 4
Location............................................................ 6
Service Access................................................ 6
Clearance Requirements................................. 7
Vibration Isolators......................................... 10
Water Piping .................................................. 12
Evaporator Freeze Protection...................... 13
Flow Switch.................................................... 14
Water Connections....................................... 15
Refrigerant Charge........................................ 15
Glycol Solutions............................................ 15
Major Component Location.........................50
Control Center................................................51
Sequence of Operation.................................53
Start-up and Shutdown .......... 55
Seasonal Start-up ..........................................55
Temporary Shutdown ...................................55
Start-up After Temporary Shutdown..........56
Extended Shutdown ......................................56
Start-up After Extended Shutdown ............57
System Maintenance.............. 58
Water Flow and Pressure Drop16
General............................................................58
Compressor Maintenance............................58
Lubrication .....................................................58
Electrical Terminals ........................................58
Condensers ....................................................58
Refrigerant Sightglass ..................................59
Lead-Lag.........................................................59
Preventative Maintenance Schedule..........60
Physical Data......................... 18
Service.................................. 61
Major Components ................ 21
Compressor Staging .............. 23
Dimensional Data................... 25
Electrical Data........................ 30
Field Wiring.................................................... 30
Wire Sizing Ampacities ................................ 31
Compressor and Condenser Fan Motors .. 38
Customer Wiring ........................................... 41
Electrical Data Notes .................................... 47
Electrical Legend........................................... 48
Typical Field Wiring Diagram...................... 49
Unit Layout and Principles of
Operation.............................. 50
Compressor Solenoids..................................61
Filter-Driers.....................................................61
Liquid Line Solenoid Valve ..........................62
Liquid Injection Solenoid Valve ..................63
Electronic Expansion Valve..........................63
Electronic Expansion Valve Operation .......64
Evaporator......................................................65
Refrigerant Charging.....................................65
In-Warranty Return Material
Procedure ............................. 67
Standard Controls ................. 68
Optional Controls ..........................................76
Controls, Settings and Functions...............78
Troubleshooting Chart .................................79
Periodic Maintenance Log...........................81
Our facility is ISO 9002 Certified
Initial Issue January 1998
"McQuay" is a registered trademarks of McQuay International

1996 McQuay International
"Illustrations cover the general appearance of McQuay International products at the time of publication and we reserve the right to
make changes in design and construction at anytime without notice"
2
IOMM ALS
Introduction
General Description
McQuay air-cooled water chillers are complete, self-contained automatic refrigerating units that
include the latest in engineering components arranged to provide a compact and efficient unit. Each
unit is completely assembled, factory wired, evacuated, charged, tested and comes complete and
ready for installation. Each unit consists of multiple air cooled condensers with integral subcooler
sections, multiple accessible semi-hermetic single-screw compressors, replaceable tube multiple circuit
shell-and-tube evaporator, and complete refrigerant piping. Liquid line components included are
manual liquid line shutoff valves, charging valves, filter-driers, liquid line solenoid valves,
sightglass/moisture indicators, and electronic expansion valves. Other features include compressor
heaters, an evaporator heater for low ambient water freeze protection, automatic one time pumpdown
of refrigerant circuit upon circuit shutdown, and an advanced fully integrated microprocessor control
system.
Nomenclature
A L S
-
XXX A
Air-Cooled
Liquid Injected
Rotary Screw Compressor
Design Vintage
Nominal Tons
Inspection
When the equipment is received, all items should be carefully checked against the bill of lading to
insure a complete shipment. All units should be carefully inspected for damage upon arrival. All
shipping damage must be reported to the carrier and a claim must be filed with the carrier. The unit’s
serial plate should be checked before unloading the unit to be sure that it agrees with the power
supply available. Physical damage to unit after acceptance is not the responsibility of McQuay
International.
Note: Unit shipping and operating weights are available in the Physical Data Tables.
Installation and Start-up
Note: Installation and maintenance are to be performed only by qualified personnel who are familiar
with local codes and regulations, and experienced with this type of equipment.
CAUTION
Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.
Start-up by McQuayService is included on all units sold for installation within the USA and Canada.
Two week prior notification of start-up is required. The contractor should obtain a copy of the Startup Scheduled Request Form from the sales representative or from the nearest office of
McQuayService.
IOMM ALS
3
Handling
Care should be taken to avoid rough handling or shock due to impact or dropping the unit. Do not
push or pull the unit from anything other than the base, and block the pushing vehicle away from the
unit to prevent damage to the sheetmetal cabinet and end frame (see Figure 1).
Never allow any part of the unit to fall during unloading or moving as this may result in serious
damage.
To lift the unit, 2½ “ (64 mm) diameter lifting holes are provided in the base of the unit. Spreader
bars and cables should be arranged to prevent damage to the condenser coils or unit cabinet (see
figures 2, 3, 4 and 5).
Figure 1, Suggested Pushing Method
Figure 2, Suggested Lifting Method, ALS 070-204
Figure 3, Suggested Lifting Method, ALS 205-280
4
IOMM ALS
Figure 4, Suggested Lifting Method, ALS 300-340
Figure 5, Suggested Lifting method, ALS 360-425
IOMM ALS
5
Location
Care should be taken in the location of the unit to provide proper airflow to the condenser, minimizing
effects on condensing pressure.
Due to the vertical condenser design of the ALS 070A thru ALS 425A chillers, it is recommended that
the unit is oriented so that prevailing winds blow parallel to the unit length, thus minimizing the effects
of condensing pressure on performance. If the unit is installed with no protection against prevailing
winds it is recommended that wind baffles be installed.
Using less clearances than shown in Figure 6, Figure 7, and Figure 8 will cause discharge air
recirculation to the condenser and could have a significant and detrimental effect on unit performance.
Service Access
Each end of the unit must be accessible after installation for periodic service work. Compressors,
filter-driers, and manual liquid line shutoff valves are accessible on each side of the unit adjacent to
the control box. High pressure and low pressure transducers are mounted on the compressor. The
cooler barrel heater thermostat is located on the cooler. Compressor overloads, microprocessor, and
most other operational, safety and starting controls are located in the unit control box.
On all ALS units the condenser fans and motors can be removed from the top of the unit. The
complete fan/motor assembly can be removed for service. The fan blade and fan motor rain shield
must be removed for access to wiring terminals at the top of the motor.
WARNING
Disconnect all power to the unit while servicing condenser fan motors. Failure to do so may cause
bodily injury or death.
6
IOMM ALS
Clearance Requirements
Figure 6, Clearance Requirements, ALS 070-204
Notes:
IOMM ALS
1.
Minimum side clearance between two units is 12 feet.
2.
Unit must not be installed in a pit or enclosure that is deeper or taller than the height of the unit
unless extra clearance is provided per note 4.
3.
Minimum clearance on each side is 8 feet when installed in a pit no deeper than the unit height.
4.
Minimum side clearance to a side wall or building taller than the unit height is 8 feet provided no
solid wall above 6 feet is closer than 12 feet to the opposite side of the unit.
5.
The removable post for compressor service access must not be blocked at either side of the unit.
6.
Do not mount electrical conduits, etc, above the side rail on either side if the unit.
7.
There must be no obstruction of the fan discharge.
7
Figure 7, Clearance Requirements, ALS 205-280
Notes:
8
1.
Minimum side clearance between two units is 12 feet.
2.
Unit must not be installed in a pit or enclosure that is deeper or taller than the height of the unit
unless extra clearance is provided per note 4.
3.
Minimum clearance on each side is 8 feet when installed in a pit no deeper than the unit height.
4.
Minimum side clearance to a side wall or building taller than the unit height is 8 feet provided no
solid wall above 6 feet is closer than 12 feet to the opposite side of the unit.
5.
The removable post for compressor service access must not be blocked at either side of the unit.
6.
Do not mount electrical conduits, etc, above the side rail on either side if the unit.
7.
There must be no obstruction of the fan discharge.
IOMM ALS
Figure 8, Clearance Requirements, ALS 300-425
Notes:
IOMM ALS
1.
Minimum side clearance between two units is 12 feet.
2.
Unit must not be installed in a pit or enclosure that is deeper or taller than the height of the unit
unless extra clearance is provided per note 4.
3.
Minimum clearance on each side is 8 feet when installed in a pit no deeper than the unit height.
4.
Minimum side clearance to a side wall or building taller than the unit height is 8 feet provided no
solid wall above 6 feet is closer than 12 feet to the opposite side of the unit.
5.
The removable post for compressor service access must not be blocked at either side of the unit.
6.
Do not mount electrical conduits, etc, above the side rail on either side if the unit.
7.
There must be no obstruction of the fan discharge.
9
Vibration Isolators
Vibration isolators are recommended for all roof mounted installations or wherever vibration
transmissions is a consideration. Figure 9,(070 thru 204), Figure 10 (205 thru 280), Figure 12 (300
thru 340) and Figure 13 (360 thru 425) give isolator locations in relation to the unit control center.
Table 2 (070 thru 204), Table 3 (205 thru 280), Table 4 (300 thru 340) and Table 6 (360 thru 425)
give the isolator loads at each location shown in Figures 9, 10, 12 and 13. Figure 11 gives dimensions
that are required to secure each McQuay isolator section to the mounting surface.
Table 1, Vibration Isolators (Spring)
ALS UNIT SIZE
TYPE
125-280
CP2-32
COLOR
OF
STRIPE
White
RECOMMENDED
MAXIMUM LOAD
LBS. (KG)
2600 (1180)
McQUAY PART
NUMBER
0047792932
Note: The same isolators are used when the chiller is supplied with the optional copper finned
condenser coils. The spring is fully compressed at approximately 3900 lbs (1769 kg).
Table 2, Isolator Loads, ALS 070-204
ALS
UNIT
ISOLATOR LOADS AT EACH MOUNTING LOCATION
LBS (KG)
SIZE
070
080
125A
140A
155A
170A
175A
185A
195A
204A
1
1920
2071
1625
1680
1720
1760
1880
1880
1920
2081
2
(871)
(939)
(737)
(762)
(780)
(785)
(853)
(853)
(871)
(944)
N/A
N/A
2065
2145
2205
2220
2350
2350
2440
2644
3
N/A
N/A
(937)
(973)
(1000)
(1007)
(1066)
(1066)
(1107)
(1199)
1332
1437
1270
1350
1410
1425
1395
1395
1440
1560
4
(604(
(652)
(576)
(612)
(640)
(647)
(633)
(633)
(653)
(707)
1460
1575
1625
1680
1720
1730
1880
1880
1920
2081
5
(662)
(715)
(737)
(762)
(780)
(785)
(853)
(853)
(871)
(944)
N/A
N/A
2065
2145
2205
2220
2350
2350
2440
2644
6
N/A
N/A
(937)
(973)
(1000)
(1007)
(1066)
(1066)
(1107)
(1199)
1013
1092
1270
1350
1410
1425
1395
1395
1440
1560
(460)
(495)
(576)
(612)
(640)
(647)
(633)
(633)
(653)
(707)
Figure 9, Isolator Locations, ALS 070-204
Table 3, Isolator Loads, ALS 205-280
ALS
UNIT
ISOLATOR LOADS AT EACH MOUNTING LOCATION
LBS (KG)
SIZE
205A
220A
235A
250A
265A
280A
10
1
1790
1790
1820
1820
1820
1830
2
(812)
(812)
(825)
(825)
(825)
(830)
1840
1850
1880
1880
1880
1890
3
4
5
6
7
8
9
10
(834)
2040
(925)
1370
(621)
950
(431)
1630
(739)
2020
(916)
1640
(744)
1650
(748)
1000
(454)
(839)
2050
(930)
1370
(621)
950
(431)
1630
(739)
2030
(921)
1650
(748)
1660
(753)
1000
(454)
(853)
5080
(943)
1370
(621)
960
(435)
1670
(757)
2060
(934)
1680
(762)
1660
(753)
1000
(454)
(853)
2080
(943)
1380
(626)
960
(435)
1670
(757)
2060
(934)
1680
(762)
1670
(757)
1000
(454)
(853)
2080
(943)
1380
(626)
960
(435)
1670
(757)
2060
(934)
1680
(762)
1670
(757)
1000
(454)
(857)
2080
(943)
1380
(626)
960
(435)
1680
(762)
2070
(939)
1690
(766)
1670
(757)
1000
(454)
IOMM ALS
Figure 10, Isolator Locations, ALS 205-280
Figure 11, Spring Flex Isolators
Table 4, Isolator Loads, ALS 300 - 340
ALS
UNIT
SIZE
1
300A
315A
330A
340A
Note:
1. Unit
2. Add
3. Unit
4. See
1780
1780
1780
1780
2
(807)
(807)
(807)
(807)
2060
2060
2060
2060
ISOLATOR LOADS AT EACH MOUNTING LOCATIONS, lb (kg)
4
5
6
7
3
(934)
(934)
(934)
(934)
2530
2530
2540
2540
(1147)
(1147)
(1152)
(1152)
2530
2530
2540
2540
(1147)
(1147)
(1152)
(1152)
2560
2560
2570
2570
(1161)
(1161)
(1166)
(1166)
2560
2560
2570
2570
(1161)
(1161)
(1166)
(1166)
2170
2170
2180
2180
(984)
(984)
(989)
(989)
8
2170
2170
2180
2180
9
(984)
(984)
(989)
(989)
1445
1445
1450
1450
OPERATING
WEIGHT
LBS (KGS)
10
(655)
(655)
(658)
(658)
1445
1445
1450
1450
(655)
(655)
(658)
(658)
21250
21250
21320
21320
(9637)
(9637)
(9669)
(9669)
to be supported at (5) isolator mounting locations per side, 10 total, as indicated.
approximately 370 lbs (168 kgs) at each isolator location for unit with optional copper finned condenser coils.
to be level in both directions within 1/8 inch (3 mm) per 10 feet (3 m).
dimensional drawing 073124701 for exact location of isolator support holes in base frame.
Figure 12, Vibration Isolators, ALS 300-340
Table 5, Vibration Isolators (Springs)
ALS UNIT SIZE
TYPE
COLOR
OF
STRIPE
MCQUAY PART
NUMBER
RECOMMENDED
MAXIMUM LOAD
LB (KG)
300A-340A
CP2-32
White
047792932
3000 (1360)
Note: The same isolators are used when the chiller is supplied with the optional copper finned
condenser coils. The spring is fully compressed at approximately 3900 lbs (1769 kgs).
Table 6, Isolator Loads, ALS 360-425
ALS
UNIT
SIZE
360A
370A
380A
425A
ISOLATOR LOAD AT EACH MOUNTING LOCATIONS, lb (kg) .
1
1780
1780
1780
1846
2
807
807
807
837
2060
2060
2060
2126
3
934
934
934
964
2530
2540
2550
2616
1147
1152
1156
1186
4
2530
2540
2550
2616
(1147)
(1152)
(1156)
(1186)
5
2540
2550
2560
2626
6
1152
1156
1161
1190
2540
2550
2560
2626
(1152)
(1156)
(1161)
(1190)
7
1670
1675
1680
1746
8
(757)
(760)
(762)
(791)
1670
1675
1680
1746
9
(757)
(760)
(762)
(791)
1720
1720
1720
1768
10
(780)
(780)
(780)
(801)
1720
1720
1720
1768
(780)
(780)
(780)
(801)
11
1080
1080
1080
1146
(490)
(490)
(490)
(520)
12
1080
1080
1080
1146
Note:
1. Unit to be supported at (6) isolator mounting locations per side, 12 total, as indicated.
2. Add approximately 370 lbs (168 kgs) at each isolator location for units with optional copper finned condenser coils.
IOMM ALS
11
(490)
(490)
(490)
(520)
3. Unit to be level in both directions within 1/8 inch (3mm) per 10 feet (3 m).
4. See dimensional drawing 073124801 for exact location of isolator support holes in base frame.
Figure 13, Vibration Isolators, ALS 360-425
Table 7, Vibration Isolators (Spring)
ALS UNIT SIZE
TYPE
COLOR
OF
STRIPE
MCQUAY PART
NUMBER
RECOMMENDED
MAXIMUM LOAD
LBS (KG)
360A
CP2-32
White
047792932
3000 (1360)
Note: The same isolators are used when the chiller is supplied with the optional copper finned condenser
coils. The spring is fully compressed at approximately 3900 lbs (1769 kgs).
Water Piping
Due to the variety of piping practices, it is advisable to follow the recommendations of local
authorities. They can supply the installer with the proper building and safety codes required for a
safe and proper installation.
Basically, the piping should be designed with a minimum number of bends and changes in elevation to
keep system cost down and performance up. It should contain:
1. Vibration eliminators to reduce vibration and noise transmission to the building.
2. Shutoff valves to isolate the unit from the piping system during unit servicing.
3. Manual or automatic air vent valves at the high points of the system. Drains at the low parts in the
system. The evaporator should not be the highest point in the piping system
4. Some means of maintaining adequate system water pressure (e.g., expansion tank or regulating
valve).
5. Water temperature and pressure indicators located at the unit to aid in unit servicing.
6. A strainer or some means of removing foreign matter from the water before it enters the pump. The
strainer should be placed far enough upstream to prevent cavitation at the pump inlet (consult
pump manufacturer for recommendations). The use of a strainer will prolong pump life and help
maintain high system performance levels.
7. A strainer should also be placed in the supply water line just prior to the inlet of the evaporator.
This will aid in preventing foreign material from entering and decreasing the performance of the
evaporator.
8. The shell-and-tube evaporator has a thermostat and heating cable to prevent freeze-up down to 20°F (-28.8°C). It is suggested that the heating cable be wired to a separate 110V supply circuit. As
shipped from the factory, it is factory wired to the control circuit. Any water piping to the unit must
also be protected to prevent freezing.
12
IOMM ALS
9. If the unit is used as a replacement chiller on a previously existing piping system, the system should
be thoroughly flushed prior to unit installation and then regular chilled water analysis and chemical
water treatment is recommended immediately at equipment start-up.
10.The total water quantity in the system should be sufficient to prevent frequent "on-off" cycling. A
reasonable minimum quantity would allow for a complete water system turnover in not less than 15
minutes.
11. In the event glycol is added to the water system, as an afterthought for freeze protection, recognize
that the refrigerant suction pressure will be lower, cooling performance less, and water side
pressure drop greater. If the percentage of glycol is large, or if propylene is employed in lieu of
ethylene glycol, the added pressure drop and loss of performance could be substantial.
12. For operations requiring the ice mode feature, logic in MicroTech will adjust the freezestat to a
pressure equivalent to 13.5°F (7.5°C) below the leaving evaporator water temperature. However, if
a different freezestat pressure value is desired, the freezestat can be manually changed through
MicroTech. Refer to IM549 for additional information.
WARNING
If a separate disconnect is used for the 110V supply to the cooler heating cable, it should be clearly
marked so that it is not accidentally shut off during cold seasons.
Prior to insulating the piping and filling the system, a preliminary leak check should be made.
Piping insulation should include a vapor barrier to prevent moisture condensation and possible
damage to the building structure. It is important to have the vapor barrier on the outside of the
insulation to prevent condensation within the insulation on the cold surface of the pipe.
Evaporator Freeze Protection
All evaporators come equipped with thermostatically controlled heat tape. When power is applied to
terminals 13 and 16, the heat tape will provide freeze protection down to -20°F (-28.8°C). However, this
should not be the only method of freeze protection. Unless the evaporator is flushed and drained as
is described below in note 4, two or more of the remaining three recommendations must be followed as
part of the system design:
1. Continuous circulation of water through the piping and the heat exchanger.
2. The inclusion of glycol solution in the chilled water circuit.
3. The addition of insulation, and heat during cold weather, to the exposed piping and heat exchanger.
4. Draining and flushing the chiller vessel with glycol during subfreezing weather.
It is the responsibility of the installing contractor and/or on-site maintenance personnel to insure that
this additional protection is provided. Routine checks should be made to insure adequate freeze
protection is maintained.
Failure to do so may result in damage to unit components. Freeze damage is not considered a
warranty failure.
IOMM ALS
13
Figure 14, Typical Field Water Piping
Vent
Outlet
Vibration
Eliminator
Valved
pressure
gauge
Vibration
Eliminator
Drain
Flow Balancing
Switch
valve
Gate valve
Protect all field piping
against freezing
Water
strainer
Gate valve
Flow Switch
A water flow switch must be mounted in either the entering or leaving water line to insure that there
will be adequate water flow to the evaporator before the unit can start. This will safeguard against
slugging the compressors on start-up. It also serves to shut down the unit in the event that water
flow is interrupted to guard against evaporator freeze-up.
A flow switch is available from McQuay under ordering number 0017503300. It is a "paddle" type
switch and adaptable to any pipe size from 1" (25mm) to 8" (203mm) nominal.
Certain minimum flow rates are required to close the switch and are listed in Table 8. Installation
should be as shown in Figure 15.
Electrical connections in the unit control center should be made at terminals 62 and 63. The normally
open contacts of the flow switch should be wired between these two terminals. Flow switch contact
quality must be suitable for 24 VAC, low current (16ma). Flow switch wire must be in separate conduit
from any high voltage conductors (115 VAC and higher).
Figure 15, Flow Switch
Table 8, Switch Minimum Flow Rates
Flow direction marked
on switch
1" (25mm) NPT flow
switch connection
NOMINAL PIPE SIZE
INCHES (MM)
MINIMUM REQUIRED FLOW TO
ACTIVATE SWITCH - GPM (LPS)
5 (127)
6 (152)
8 (203)
58.7 (3.7)
79.2 (5.0)
140 (8.8)
Note: Water pressure differential switch is not recommended for
outdoor applications.
Tee
1 1/4" (32mm) pipe dia.
Min. after switch
14
1 1/4" (32mm) dia.
Min. before switch
IOMM ALS
Water Connections
Water piping to the cooler can be brought up through the bottom of the unit or through the side
between the vertical supports. The dimensional data in Figure 18 through Figure 22 give the
necessary dimensions and locations for all piping connections.
Note: On unit size 175A through 204A there is a diagonal brace off of a vertical support which will
interfere with the water connection if brought in from the side. This brace can be removed, but only
after the unit is in place.
Refrigerant Charge
All units are designed for use with HCFC-22 and are compatible with some HCFC alternatives and are
shipped with a full operating charge. The operating charge for each unit is shown in the Physical Data
Tables.
Glycol Solutions
The chillers capacity when using glycols, glycol solution flow rate, and pressure drop through the
cooler may be calculated using the following formulas and tables.
Note: The procedure below does not specify the type of glycol. Use the derate factors found in Table
9 for corrections when using propylene glycol and those in Table 10 for ethylene glycol.
1. Capacity - Cooling capacity is reduced from that with plain water. To find the reduced value
multiply the chiller’s water system tonnage by the capacity correction factor to find the chiller’s
capacity when using glycol.
2. Flow - To determine flow (or delta-T) knowing delta-T (or flow) and capacity:
GPM =
(24)( tons)( flowfactor)
Delta − T
3. Pressure drop - To determine pressure drop through the cooler, when using glycol, enter the water
pressure drop curve, Figure 16 or Figure 17,at the actual glycol flow. Multiply the water pressure drop
found there by the PD factor to obtain corrected glycol pressure drop.
4. To determine glycol system kW, multiply the water system kW by factor called Power.
Test coolant with a clean, accurate glycol solution hydrometer (similar to that found in service
stations) to determine the freezing point. Obtain percent glycol from the freezing point table below.
On glycol applications it is normally recommended by the supplier that a minimum of 25% solution by
weight be used for protection against corrosion.
CAUTION
Do not use an automotive grade antifreeze. Industrial grade glycols must be used. Automotive
antifreeze contains inhibitors which will cause plating on the copper tubes within the chiller
evaporator. The type and handling of glycol used must be consistent with local codes.
Table 9,Propylene Glycol
%
E.G.
10
20
30
40
50
IOMM ALS
Table 10, Ethylene Glycol
FREEZE
PT.
o
o
F
C
CAP
POWER
FLOW
PD
E.G.
26
19
9
-5
-27
0.987
0.975
0.962
0.946
0.965
0.992
0.985
0.978
0.971
0.965
1.010
1.028
1.050
1.078
1.116
1.068
1.147
1.248
1.366
1.481
10
20
30
40
50
-3
-7
-13
-21
-33
%
FREEZE
PT.
o
o
F
C
CAP
POWER
FLOW
PD
26
18
7
-7
-28
0.991
0.982
0.972
0.961
0.946
0.996
0.992
0.986
0.976
0.966
1.013
1.040
1.074
1.121
1.178
1.070
1.129
1.181
1.263
1.308
-3
-8
-14
-22
-33
15
Water Flow and Pressure Drop
Balance the chilled water flow through the evaporator. The flow rates must fall between the minimum
and maximum values shown in Table 11 and Table 12. Flow rates below the minimum values shown
will result in laminar flow which will reduce efficiency, cause erratic operation of the electronic
expansion valve and could cause low temperature cutouts. On the other hand flow rates exceeding
the maximum values shown can cause erosion on the evaporator water connections and tubes.
Measure the chilled water pressure drop through the evaporator at field installed pressure taps. It is
important not to include valves or strainers in these readings.
Variable chilled water flow through the evaporator while the compressor(s) are operating is not
recommended. MicroTech control set points are based upon a constant flow and variable
temperature.
Table 11, ALS 070 - 100, Min/Max Flow Rates
ALS UNIT
MIN. FLOW
RATE
MAX FLOW RATE
ALS UNIT
MIN. FLOW
RATE
MAX. FLOW
RATE
SIZE
GPM
LPS
GPM
LPS
SIZE
GPM
LPS
GPM
LPS
070
080
090
100
102
122
139
147
6.5
7.7
8.8
9.3
272
324
369
391
17.2
20.5
23.4
24.8
220
235
250
265
335
356
376
391
21.2
22.5
23.8
24.7
893
950
1000
1043
56.4
60.0
63.2
66.0
Figure 16, ALS 070 - 100, Evaporator Pressure Drop
16
IOMM ALS
Table 12, ALS 125 - 425, Min/Max Flow Rates
ALS UNIT
MIN. FLOW
RATE
MAX FLOW RATE
ALS UNIT
MIN. FLOW
RATE
MAX. FLOW
RATE
SIZE
GPM
LPS
GPM
LPS
SIZE
GPM
LPS
GPM
LPS
125
140
155
170
175
185
195
204
205
186
209
231
253
256
274
284
303
309
11.8
13.2
14.6
16.0
16.2
17.3
18.0
19.1
19.5
497
557
617
675
683
730
767
808
825
31.4
35.2
39.0
42.7
43.2
46.1
48.5
51.0
52.1
280
300
315
330
340
360
370
380
425
408
440
459
479
493
523
540
559
616
25.8
27.8
29.0
30.2
31.1
33.0
34.1
35.3
38.9
1088
1173
1222
1276
1313
1395
1438
1490
1650
68.8
74.1
77.1
80.6
82.9
88.1
90.8
94.1
104.2
Figure 17, ALS 125 - 425, Evaporator Pressure Drop
IOMM ALS
17
Physical Data
Table 13, ALS 070-100
ALS MODEL NUMBER
DATA
070A
080A
090A
100A
Unit capacity @ ARI conditions, tons
(kW)
Unit operating charge R-22, lbs (kg)
Cabinet dimensions L x W x H, in.
(mm)
Unit operating weight, lbs. (kg)
Unit shipping weight, lbs. (kg)
68.1 (239)
77.9 (274)
90.6 (319)
96.4 (339)
150 (68)
124.7 X 83.4 X 92.5
(3167 X 2118 X 2350)
5725 (2597)
5500 (2495)
160 (73)
124.7 X 83.4 X 92.5
(3167 X 2118 X 2350)
6175 (2801)
5900 (2676)
180 (82)
159.4 X 83.4 X 92.5
(4049 X 2118 X 2350)
6825 (3096)
6500 (2948)
190 (87)
159.4 X 83.4 X 92.5
(4049 X 2118 X 2350)
7300 (3311)
6900 (3130)
80(280)
95 (335)
95 (335)
115.6 (10.7)
161 x 104
(4064 x 2642)
16 x 3
154.1 (14.3)
160 x 138.7)
4064 x 3523)
16 x 3
154.1 (14.3)
160 x 138.7)
4064 x 3523)
16 x 3
6-28 (711)
6-1.5 (1.1)
1140
8357
6-28 (711)
6-1.5 (1.1)
1140
8357
8-28 (711)
6-1.5 (1.1)
1140
8357
8-28 (711)
6-1.5 (1.1)
1140
8357
54120
54120
72160
72160
12-08
(305-2439)
24.3 (92.0)
175 (1207)
225 (1552)
14008
(356-2439)
32.6 (123.4)
175 (1207)
225 (1552)
14-10
(356-3048)
41.3 (156.3)
175 (1207)
225 (1552)
16-10
(407-3048)
43.6 (165)
175 (1207)
225 (1552)
125A
140A
BASIC DATA
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW0
65 (230)
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m 2)
Finned height x finned length, in.
(mm)
Fins per inch x rows deep
115.6 (10.7)
160 x 104
(4064 x 2642)
16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm)
No. of motors - hp (kW)
Fan & motor rpm, 60/50Hz
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
60 Hz total unit airflow, cfm
50 Hz total unit airflow, (m2/sec
EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE
Shell diameter - tube length
in (mm) - ft. (mm)
Water volume, gallons (L)
Max. water pressure, psi (kPa)
Max. refrigerant pressure, psi (kPa)
Table 14, ALS 125-170
ALS MODEL NUMBER
DATA
155A
170A
CKT.1
CKT.2
CKT.1
CKT.2
CKT.1
CKT.2
CKT.1
CKT.2
62.2 (218)
62.2 (218)
64.4 (226)
75 (263)
77.1 (271)
77.1 (271)
79 (278)
89.7 (315)
BASIC DATA
Unit capacity @ ARI conditions, tons
(kW)
Unit operating charge R-22, lbs (kg)
Cabinet dimensions L x W x H, in.
(mm)
Unit operating weight, lbs. (kg)
Unit shipping weight, lbs. (kg)
140 (63.5)
140 (63.5)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
9920 (4500)
9600 (4355)
140 (63.5)
150 (68.1)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
10350 (4700)
9900 (4450)
150 (68.1)
150 (68.1)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
10670 (4840)
10250 (4650)
150 (68.1)
160 (72.6)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
10750 (4880)
10350 (4700)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW0
65 (230)
65 (230)
65 (230)
80 (280)
80 (280)
80 (280)
80 (280)
95 (335)
115.6 (10.7)
80 x 208
(2032 x 5283)
115.6 (10.7)
80 x 208
(2032 x 5283)
115.6 (10.7)
80 x 208
(2032 x 5283)
115.6 (10.7)
80 x 208
(2032 x 5283)
115.6 (10.7)
80 x 208
(2032 x 5283)
16 x 3
16 x 3
16 x 3
16 x 3
16 x 3
115.6 (10.7)
80 x 208
(2032 x
5283)
16 x 3
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m 2)
Finned height x finned length, in.
(mm)
Fins per inch x rows deep
115.6 (10.7)
115.6 (10.7)
80 x 208
80 x 208
(2032 x 5283) (2032 x 5283)
16 x 3
16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm)
No. of motors - hp (kW)
Fan & motor rpm, 60/50Hz
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
60 Hz total unit airflow, cfm
50 Hz total unit airflow, (m2/sec
10 - 28 (711)
10 - 1.5 (1.1)
1140/950
8357
(35.4)
90200
(35.5)
10 - 28 (711)
10 - 1.5 (1.1)
1140/950
8357
(35.4)
90200
(35.5)
12 - 28 (711)
12 - 1.5 (1.1)
1140/950
8357
(35.4)
108240
(42.6)
12 - 28 (711)
12 - 1.5 (1.1)
1140/950
8357
(35.4)
108240
(42.6)
16 - 10
16 - 10
16 - 10
EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE
Shell diameter - tube length
18
14 - 10
IOMM ALS
in (mm) - ft. (mm)
Water volume, gallons (L)
Max. water pressure, psi (kPa)
Max. refrigerant pressure, psi (kPa)
(356
36.1
175
225
- 3048)
(136.7)
(1207)
(1552)
(406
45.6
175
225
- 3048)
(172.6)
(1207)
(1552)
(406
45.6
175
225
- 3048)
(172.6)
(1207)
(1552)
(406
45.6
175
225
- 3048)
(172.6)
(1207)
(1552)
Table 15, ALS 175-204
ALS MODEL NUMBER
DATA
Unit capacity @ ARI conditions,
tons (kW)
Unit operating charge R-22, lbs
(kg)
Cabinet dimensions
L x W x H, in. (mm)
Unit operating weight, lbs. (kg)
Unit shipping weight, lbs. (kg)
175A
185A
195A
204A
CKT.1
CKT.2
CKT.1
CKT.2
CKT.1
CKT.2
CKT.1
CKT.2
80.4 (282)
90.6 (318)
91.2 (320)
91.2 (320)
94.6 (332)
94.6 (332)
101 (355)
101 (355)
160 (72.6)
160 (72.6)
160 (72.6)
160 (72.6)
170 (77.1)
170 (77.1)
195 (88.4)
195 (88.4)
263.4 x 83.4 x 92.5
(6690 x 2118 x 2350)
11250 (5100)
10850 (4920)
263.4 x 83.4 x 92.5
(6690 x 2118 x 2350)
11250 (5100)
10850 (4920)
263.4 x 83.4 x 92.5
(6690 x 2118 x 2350)
11500 (5218)
11100 (5036)
263.4 x 83.4 x 92.5
(6690 x 2118 x 2350)
12570 (5701)
11980 (5433)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW)
80 (280)
95 (335)
95 (335)
95 (335)
95 (335)
95 (335)
95 (335)
95 (335)
135.0
(12.5)
80 x 243
(2032 x
6172)
12 x 4
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m 2)
135.0 (12.5)
135.0 (12.5)
135.0 (12.5)
135.0 (12.5)
135.0 (12.5)
135.0 (12.5)
135.0 (12.5)
Finned height x finned length, in.
(mm)
80 x 243
(2032 x
6172)
16 x 3
80 x 243
(2032 x 6172)
80 x 243
(2032 x
6172)
16 x 3
80 x 243
(2032 x
6172)
16 x 3
80 x 243
(2032 x
6172)
16 x 3
80 x 243
(2032 x
6172)
16 x 3
80 x 243
(2032 x
6172)
12 x 4
Fins per inch x rows deep
16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in.
(mm)
No. of motors - hp (kW)
Fan & motor rpm, 60/50Hz
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
60 Hz total unit airflow, cfm
50 Hz total unit airflow, (m2/sec
14 - 28 (711)
14 - 28 (711)
14 - 28 (711)
14 - 28 (711)
14 - 1.5 (1.1)
1140/950
8357
(35.4)
126280
(49.7)
14 - 1.5 (1.1)
1140/950
8357
(35.4)
12680
(49.7)
14 - 1.5 (1.1)
1140/950
8357
(35.4)
12680
(49.7)
14 - 2.0 (1.5)
1140/950
8357
(35.4)
138908
(54.7)
16 - 10
(406 - 3048)
43.6 (165.0)
175 (1207)
225 (1552)
18 - 10
(457 - 3048)
57.3 (216.9)
175 (1207)
225 (1552)
20 - 10
(508 - 3048)
69.6 (263.5)
175 (1207)
225 (1552)
EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE
Shell diameter - tube length
in (mm) - ft. (mm)
Water volume, gallons (L)
Max. water pressure, psi (kPa)
Max. refrigerant pressure, psi
(kPa)
16 - 10
(406 - 3048)
43.6 (165.0)
175 (1207)
225 (1552)
Table 16, ALS 205-235
ALS MODEL NUMBER
DATA
Unit capacity @ ARI conditions,
tons (kW)
Unit operating charge R-22, lbs (kg)
Cabinet dimensions
L x W x H, in. (mm)
Unit operating weight, lbs. (kg)
Unit shipping weight, lbs. (kg)
CKT.1
205A
CKT.2
CKT.3
CKT.1
220a
CKT.2
CKT.3
CKT.1
235A
CKT.2
CKT.3
64.4 (226)
66.1 (232)
75.8 (266)
66.1 (232)
78.2 (275)
79.0 (277)
79.3 (279)
79.3 (279)
79.0 (277)
140 (63.5)
150 (68.1)
355 x 83.4 x 94.5
(9017 x 2118 x 2400)
15930 (7224)
15250 (6916)
140 (63.5)
150 (68.1)
150 (68.1)
355 x 83.4 x 94.5
(9017 x 2118 x 2400)
15930 (7224)
15330 (6952)
150 (68.1)
140 (63.5)
150 (68.1)
150 (68.1)
355 x 83.4 x 94.5
(9017 x 2118 x 2400)
15930 (7224)
15330 (6952)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW0
65 (230)
65 (230)
80 (280)
65 (230)
80 (280)
80 (280)
80 (280)
80 (280)
80 (280)
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
160 x 104
(4064 x
2642)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
160 x 104
(4064 x
2642)
16 x 3
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m 2)
Finned height x finned length, in.
(mm)
Fins per inch x rows deep
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
160 x 104
(4064 x
2642)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm)
No. of motors - hp (kW)
Fan & motor rpm, 60/50Hz
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
IOMM ALS
16 - 28 (711)
16 - 1.5 (1.1)
1140/950
8357
(35.4)
16 - 28 (711)
16 - 1.5 (1.1)
1140/950
8357
(35.4)
18 - 28 (711)
18 - 1.5 (1.1)
1140/950
8357
(35.4)
19
60 Hz total unit airflow, cfm
50 Hz total unit airflow, (m2/sec
144320
(56.8)
144320
(56.8)
162360
(63.9)
20 - 10
(508 - 3048)
76 (287.7)
175 (1207)
225 (1552)
20 - 10
(508 - 3048)
76 (287.7)
175 (1207)
225 (1552)
EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE
Shell diameter - tube length
in (mm) - ft. (mm)
Water volume, gallons (L)
Max. water pressure, psi (kPa)
Max. refrigerant pressure, psi (kPa)
20 - 10
(508 - 3048)
81 (306.6)
175 (1207)
225 (1552)
Table 17, ALS 250-280
ALS MODEL NUMBER
DATA
Unit capacity @ ARI conditions,
tons (kW)
Unit operating charge R-22, lbs (kg)
Cabinet dimensions
L x W x H, in. (mm)
Unit operating weight, lbs. (kg)
Unit shipping weight, lbs. (kg)
CKT.1
250A
CKT.2
CKT.3
CKT.1
265A
CKT.2
CKT.3
CKT.1
280A
CKT.2
CKT.3
80.2 (282)
79.0 (277)
91 (320)
80.2 (282)
89.7 (315)
91 (320)
91.4 (321)
89.7 (315)
91 (320)
150 (68.1)
150 (68.1)
160 (72.6)
355 x 83.4 x 94.5
(9017 x 2118 x 2400)
16200 (7347)
15600 (7075)
150 (68.1)
160 (72.6)
160 (72.6)
355 x 83.4 x 94.5
(9017 x 2118 x 2400)
16200 (7347)
15600 (7075)
160 (72.6)
160 (72.6)
160 (72.6)
355 x 83.4 x 94.5
(9017 x 2118 x 2400)
16250 (7370)
15650 (7098)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW0
80 (280)
80 (280)
95 (335)
80 (280)
95 (335)
95 (335)
95 (335)
95 (335)
95 (335)
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
160 x 104
(4064 x
5283)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
160 x 104
(4064 x
5283)
16 x 3
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m 2)
Finned height x finned length, in.
(mm)
Fins per inch x rows deep
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
115.6
(10.7)
160 x 104
(4064 x
5283)
16 x 3
115.6
(10.7)
80 x 208
(2032 x
5283)
16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm)
No. of motors - hp (kW)
Fan & motor rpm, 60/50Hz
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
60 Hz total unit airflow, cfm
50 Hz total unit airflow, (m2/sec
18 - 28 (711)
18 - 1.5 (1.1)
1140/950
8357
(35.4)
162360
(63.9)
18 - 28 (711)
18 - 1.5 (1.1)
1140/950
8357
(35.4)
162360
(63.9)
18 - 28 (711)
18 - 1.5 (1.1)
1140/950
8357
(35.4)
162360
(63.9)
20 - 10
(508 - 3048)
69.6 (263.5)
175 (1207)
225 (1552)
20 - 10
(508 - 3048)
69.6 (263.5)
175 (1207)
225 (1552)
EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE
Shell diameter - tube length
in (mm) - ft. (mm)
Water volume, gallons (L)
Max. water pressure, psi (kPa)
Max. refrigerant pressure, psi (kPa)
20 - 10
(508 - 3048)
69.6 (263.5)
175 (1207)
225 (1552)
Table 18, ALS 300-340
ALS MODEL NUMBER
DATA
Unit capacity @ ARI conditions, tons
(kW)
Unit operating charge R-22, lbs (kg)
Cabinet dimensions
L x W x H, in. (mm)
Unit operating weight, lbs. (kg)
Unit shipping weight, lbs. (kg)
300A
315A
330A
340A
CKT.1 CKT.2 CKT.3 CKT.4 CKT.1 CKT.2 CKT.3 CKT.4 CKT.1 CKT.2 CKT.3 CKT.4 CKT.1 CKT.2 CKT.3 CKT.4
66.9
66.9
79.7
79.7
(235) (235) (280) (280)
155
155
160
160
(70.3) (70.3) (72.6) (72.6)
389.7 x 83.4 x 94.5
(9898 x 2118 x 2400)
21250 (9637)
20300 (9206)
66.9
79.7
79.7
79.7
(235) (280) (280) (280)
155
160
160
160
(70.3) (72.6) (72.6) (72.6)
389.7 x 83.4 x 94.5
(9898 x 2118 x 2400)
21250 (9637)
20300 (9206)
79.2
79.7
80.3
80.3
(278) (280) (282) (282)
160
160
160
160
(72.6) (72.6) (72.6) (72.6)
389.7 x 83.4 x 94.5
(9898 x 2118 x 2400)
21320 (9669)
20400 (9252)
79.2
79.7
80.3
89.4
(278) (280) (282) (314)
160
160
160
170
(72.6) (72.6) (72.6) (77.1)
389.7 x 83.4 x 94.5
(9898 x 2118 x 2400)
21320 (9669)
20400 (9252)
65
(230)
80
(280)
80
(280)
80
(280)
80
(280)
80
(280)
80
(280)
80
(280)
80
(280)
95
(335)
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW0
65
(230)
65
(230)
80
(280)
80
(280)
80
(280)
80
(280)
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m 2)
96.3
(8.9)
Finned height x finned length, in. (mm) 80 x
173
(2032
x
20
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
96.3
(8.9)
80 x
173
(2032
x
IOMM ALS
4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394) 4394)
12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4
Fins per inch x rows deep
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm)
No. of motors - hp (kW)
Fan & motor rpm, 60/50Hz
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
60 Hz total unit airflow, cfm
50 Hz total unit airflow, (m2/sec
20 - 28 (711)
20 - 2.0 (1.5)
1140/950
8357
(35.4)
198440
(93.6)
20 - 28 (711)
20 - 2.0 (1.5)
1140/950
8357
(35.4)
198440
(93.6)
20 - 28 (711)
20 - 2.0 (1.5)
1140/950
8357
(35.4)
198440
(93.6)
20 - 28 (711)
20 - 2.0 (1.5)
1140/950
8357
(35.4)
198440
(93.6)
24 - 10
(609 - 3048)
112 (424)
175 (1207)
24 - 10
(609 - 3048)
107 (405.0)
175 (1207)
24 - 10
(609 - 3048)
107 (405.0)
175 (1207)
EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE
Shell diameter - tube length
in (mm) - ft. (mm)
Water volume, gallons (L)
Max. water pressure, psi (kPa)
24 - 10
(609 - 3048)
112 (424)
175 (1207)
Table 19, ALS 360-425
ALS MODEL NUMBER
DATA
360A
CKT.1 CKT.2 CKT.3 CKT.4
370A
CKT.1 CKT.2 CKT.3
80.9
(284)
175
(79.4)
80.9
(284)
175
(79.4)
CKT.4 CKT.1
380A
CKT.2 CKT.3
CKT.4 CKT.1
425A
CKT.2 CKT.3
CKT.4
BASIC DATA
Unit capacity @ ARI
conditions, tons (kW)
Unit operating charge R-22, lbs
(kg)
Cabinet dimensions
L x W x H, in. (mm)
Unit operating weight, lbs. (kg)
Unit shipping weight, lbs. (kg)
80.9
93.4
93.4
(284)
(328)
(328)
175
180
180
(79.4) (81.6) (81.6)
459 x 83.4 x 94.5
(11659 x 2118 x 2400)
22920 (10395)
22000 (9977)
91.8
93.4
93.4
(323)
(328)
(328)
180
180
180
(81.6) (81.6) (81.6)
459 x 83.4 x 94.5
(11659 x 2118 x 2400)
22970 (10417)
22050 (10000)
92.3
(325)
180
(81.6)
92.3
93.4
93.4
(325)
(328)
(328)
180
180
180
(81.6) (81.6) (81.6)
459 x 83.4 x 94.5
(11659 x 2118 x 2400)
23020 (10440)
22100 (10023)
100.3
(353)
190
(86.2)
100.3 100.3 100.3
(353)
(353)
(353)
190
190
190
(86.2) (86.2) (86.2)
459 x 83.4 x 94.5
(11659 x 2118 x 2400)
23813 (10800)
22715 (10302)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW0
80
(280)
80
(280)
95
(335)
95
(335)
80
(280)
95
(335)
95
(335)
95
(335)
95
(335)
95
(335)
95
(335)
95
(335)
95
(335)
95
(335)
95
(335)
95
(335)
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m 2)
115.6
(10.7)
80 x
208
(2032 x
5283)
12 x 4
Finned height x finned length,
in. (mm)
Fins per inch x rows deep
115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6 115.6
(10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7) (10.7)
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
80 x
208
208
208
208
208
208
208
208
208
208
208
208
208
208
208
(2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x (2032 x
5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283) 5283)
12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan dia., in. (mm)
No. of motors - hp (kW)
Fan & motor rpm, 60/50Hz
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
60 Hz total unit airflow, cfm
50 Hz total unit airflow, (m2/sec
24 - 28 (711)
24 - 2.0 (1.5)
1140/950
8357
(35.4)
238128
(112.4)
24 - 28 (711)
24 - 2.0 (1.5)
1140/950
8357
(35.4)
238128
(112.4)
24 - 28 (711)
24 - 2.0 (1.5)
1140/950
8357
(35.4)
238128
(112.4)
24 - 28 (711)
24 - 2.5 (1.9)
1140/950
8357
(35.4)
257180
(121.4)
24 - 10
((609 - 3048)
107 (405.0)
175 (1207)
225 (1552)
24 - 10
((609 - 3048)
107 (405.0)
175 (1207)
225 (1552)
24 - 12
(609 - 3658)
129 (488)
175 (1207)
225 (1552)
EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE
Shell diameter - tube length
in (mm) - ft. (mm)
Water volume, gallons (L)
Max. water pressure, psi (kPa)
Max. refrigerant pressure, psi
(kPa)
24 - 10
((609 - 3048)
107 (405.0)
175 (1207)
225 (1552)
Major Components
Table 20, ALS 070-425
UNIT SIZE
070
080
090
100
125A
140A
IOMM ALS
COMPRESSOR
IDENTIFICATION
155
167
175
175
155
155
155
167
-
EVAPORATOR
VESSEL SIZE
-
1208-1
1408-1
1410-1
1610-1
1410-1
1610-1
ELECTRONIC EXPANSION
VALVE SIZE
100
140
170
170
100
140
100
140
-
CONTACTOR DESIGNATION
FOR COMPRESSOR
-
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M2-M6
M2-M6
-
-
21
155A
170A
175A
185A
195A
204A
205A
220A
235A
250A
265A
280A
300A
315A
330A
340A
360A
370A
380A
425A
22
167
167
167
175
175
175
155
155
167
167
167
175
155
155
167
167
167
167
175
175
167
175
175
175
175
175
155
167
167
167
175
175
155
167
167
167
167
175
175
175
167
167
167
167
175
175
167
167
167
167
175
175
175
175
167
167
167
175
175
175
175
175
1610-1
1610-1
1610-1
1610-1
1810-1
2010-1
2010-3
2010-2
2010-2
2010-1
2010-1
2010-1
2410-2
2410-2
2410-1
2410-1
2410-1
2410-1
2410-1
2412-1
140
170
170
170
170
170
140
140
140
140
170
170
140
140
140
140
140
170
170
170
140
170
170
170
170
170
140
140
140
140
170
170
140
140
140
140
140
170
170
170
140
140
140
140
170
170
140
140
140
170
170
170
170
170
140
140
140
170
170
170
170
170
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M1-M5
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M2-M6
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M3-M7
M4-M8
M4-M8
M4-M8
M4-M8
M4-M8
M4-M8
M4-M8
M4-M8
IOMM ALS
Compressor Staging
ALS 125-204 (Does not apply to ALS 070-100)
Table 21, Two Compressors Available
STAGE UP
LEAD
COMPRESSOR
LAG 1
COMPRESSOR
UNIT
CAPACITY
STAGE Down
LEAD
COMPRESSOR
LAG 1
COMPRESSOR
UNIT
CAPACITY
1
2
3
4
5
6
7
8
50%
75%
50%
75%
75%
100%
100%
0%
0%
50%
50%
75%
75%
100%
0%
25.0%
37.5%
50.0%
62.5%
75.0%
87.5%
100.0%
1
2
3
4
5
6
7
8
25%
50%
75%
50%
75%
75%
100%
100%
0%
0%
0%
50%
50%
75%
75%
100%
12.5%
25.0%
37.5%
50.0%
62.5%
75.0%
87.5%
100.0%
Table 22, One Compressor Available
STAGE UP
LEAD
COMPRESSOR
LAG 1
COMPRESSOR
UNIT
CAPACITY
STAGE Down
LEAD
COMPRESSOR
LAG 1
COMPRESSOR
UNIT
CAPACITY
1
2
3
4
50%
75%
50%
0%
0%
0%
0%
25.0%
37.5%
50.0%
1
2
3
4
25%
50%
75%
100%
0%
0%
0%
0%
12.5%
25.0%
37.5%
50.0%
ALS 205-280
Table 23, Three Compressors Available
STAGE
UP
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
UNIT
CAPACITY
STAGE
DOWN
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
UNIT
CAPACITY
1
2
3
4
5
6
7
8
9
10
11
12
50%
75%
50%
75%
75%
75%
75%
75%
100%
100%
100%
0%
0%
50%
50%
75%
50%
75%
75%
75%
100%
100%
0%
0%
0%
0%
0%
50%
50%
75%
75%
75%
100%
0%
16.7%
25.0%
33.3%
41.7%
50.0%
58.3%
66.7%
75.0%
83.3%
91.6%
100.0%
1
2
3
4
5
6
7
8
9
10
11
12
25%
50%
75%
50%
75%
50%
75%
75%
75%
100%
100%
100%
0%
0%
0%
50%
50%
50%
50%
75%
75%
75%
100%
100%
0%
0%
0%
0%
0%
50%
50%
50%
75%
75%
75%
100%
8.3%
16.7%
25.0%
33.3%
41.7%
50.0%
58.3%
66.7%
75.0%
83.3%
91.6%
100.0%
Table 24, Two compressors available
STAGE
UP
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
UNIT
CAPACITY
STAGE
DOWN
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
UNIT
CAPACITY
1
2
3
4
5
6
7
8
50%
75%
50%
75%
75%
100%
100%
0%
0%
50%
50%
75%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
16.7%
25.0%
33.3%
41.7%
50.0%
58.3%
66.7%
1
2
3
4
5
6
7
8
25%
50%
75%
50%
75%
75%
100%
100%
0%
0%
0%
50%
50%
75%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
8.3%
16.7%
25.0%
33.3%
41.7%
50.0%
58.3%
66.7%
Table 25, One Compressor Available
STAGE
UP
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
UNIT
CAPACITY
STAGE
DOWN
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
UNIT
CAPACITY
1
2
3
4
50%
75%
100%
0%
0%
0%
0%
0%
0%
0%
16.7%
25.0%
33.3%
1
2
3
4
25%
50%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
8.3%
16.7%
25.0%
33.3%
IOMM ALS
23
ALS 300-425
Table 26, Four Compressors Available
STAGE
UP
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
LAG 3
COMP.
UNIT
CAPACITY
STAGE
DOWN
LEAD
COMP.
LAG 1
COMP.
LAG 2
COMP.
LAG 3
COMP.
UNIT
CAPACITY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
50%
75%
50%
75%
75%
75%
75%
75%
75%
75%
75%
100%
100%
100%
100%
0%
0%
50%
50%
75%
50%
75%
75%
75%
75%
75%
75%
100%
100%
100%
0%
0%
0%
0%
0%
50%
50%
75%
50%
75%
75%
75%
75%
100%
100%
0%
0%
0%
0%
0%
0%
0%
0%
50%
50%
75%
75%
75%
75%
100%
0.0%
12.5%
18.8%
25.0%
31.3%
37.5%
43.8%
50.0%
56.3%
62.5%
68.8%
75.0%
81.3%
87.5%
93.8%
100.0%
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
25%
50%
75%
50%
75%
50%
75%
50%
75%
75%
75%
75%
100%
100%
100%
100%
0%
0%
0%
50%
50%
50%
50%
50%
50%
75%
75%
75%
75%
100%
100%
100%
0%
0%
0%
0%
0%
50%
50%
50%
50%
50%
75%
75%
75%
75%
100%
100%
0%
0%
0%
0%
0%
0%
0%
50%
50%
50%
50%
75%
75%
75%
75%
100%
6.3%
12.5%
18.8%
25.0%
31.3%
37.5%
43.8%
50.0%
56.3%
62.5%
68.8%
75.0%
81.3%
87.5%
93.8%
100.0%
Table 27,Three Compressors Available
STAG
E
LEAD
COMPRESS
OR
LAG 1
COMPRESS
OR
LAG 2
COMPRESS
OR
LAG 3
COMPRESS
OR
UNIT
CAPACITY
LEAD
COMPRESS
OR
LAG 1
COMPRESS
OR
LAG 2
COMPRESS
OR
LAG 3
COMPRESS
OR
UNIT
CAPACITY
1
2
3
4
5
6
7
8
9
10
11
12
50%
75%
50%
75%
75%
75%
75%
75%
100%
100%
100%
0%
0%
50%
50%
75%
50%
75%
75%
75%
100%
100%
0%
0%
0%
0%
0%
50%
50%
75%
75%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0.0%
12.5%
18.8%
25.0%
31.3%
37.5%
43.8%
50.0%
56.3%
62.5%
68.8%
75.0%
25%
50%
75%
50%
75%
50%
75%
75%
75%
100%
100%
100%
0%
0%
0%
50%
50%
50%
50%
75%
75%
75%
100%
100%
0%
0%
0%
0%
0%
50%
50%
50%
75%
75%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
6.3%
12.5%
18.8%
25.0%
31.3%
37.5%
43.8%
50.0%
56.3%
62.5%
68.8%
75.0%
Table 28, Two Compressors Available
LEAD
LAG 1
LAG 2
LAG 3
STAGE COMPRESSO COMPRESSO COMPRESSO COMPRESSO
R
R
R
R
1
2
3
4
5
6
7
8
50%
75%
50%
75%
75%
100%
100%
0%
0%
50%
50%
75%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
UNIT
CAPACITY
0.0%
12.5%
18.8%
25.0%
31.3%
37.5%
43.8%
50.0%
LEAD
LAG 1
LAG 2
LAG 3
COMPRESSO COMPRESSO COMPRESSO COMPRESSO
R
R
R
R
25%
50%
75%
50%
75%
75%
100%
100%
0%
0%
0%
50%
50%
75%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
UNIT
CAPACITY
6.3%
12.5%
18.8%
25.0%
31.3%
37.5%
43.8%
50.0%
Table 29, One Compressors Available
LEAD
LAG 1
LAG 2
LAG 3
STAGE COMPRESSO COMPRESSO COMPRESSO COMPRESSO
R
R
R
R
1
2
3
4
24
50%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
0%
UNIT
CAPACITY
0.0%
12.5%
18.8%
25.0%
LEAD
LAG 1
LAG 2
LAG 3
COMPRESSO COMPRESSO COMPRESSO COMPRESSO
R
R
R
R
25%
50%
75%
100%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
UNIT
CAPACITY
6.3%
12.5%
18.8%
25.0%
IOMM ALS
Dimensional Data
Figure 18, ALS 070A-100A
ALS
UNIt
SIZE
LENGTH
EVAPORATOR
CENTER OF GRAVITY
UNIT WEIGHTS lb (kg)
A
B
C
D
E
X
Y
OPERATING
SHIPPING
COPPER
FIN ADD
070A
080A
090A
100A
124.7(3167)
124.7(3167
159.4(4049)
159.4(4049)
93.7(2380)
93.7(2380)
128.4(3261)
128.4(3261)
9.9(252)
9.9(252)
20.6(524)
20.6(524)
15.0(381)
15.0(381)
15.0(381)
15.0(381)
15.9(404)
19.5(495)
19.5(495)
19.5(495)
52.9(1344)
52.9(1344)
64.9(1649)
64.9(1649)
39.0(991)
39.0(991)
39.0(991)
39.0(991)
5725(2597)
6175(2801)
6825(3096)
7300(3311)
5500(2495)
5900(2676)
6500(2948)
6900(3130)
850(387)
850(387)
1150(523)
1150(523)
o
ALS
UNIT
SIZE
Qty.
Nom. Tons
Qty.
070A
080A
090A
100A
1
1
1
1
65
80
95
95
6
6
8
8
IOMM ALS
COMPRESSOR
FANS
H.P.
REFRIGERANT
CHARGE lb (kg)
System #1
LIFTING HOLES
ISOLATOR MOUNTING
L1
L2
S1
S2
S3
1.5
1.5
1.5
1.5
150(68)
160(73)
180(82)
190(87)
18.6(473)
18.6(473)
18.6(473)
18.6(473)
107.9(2740)
107.9(2740)
131.9(3350)
131.9(3350)
13.0(330)
13.0(330)
13.0(330)
13.0(330)
N/A
N/A
95.0(2416)
95.0(2416)
110.4(2805)
110.4(2805)
146.9(3731)
146.9(3731)
25
Figure 19, ALS 125A-204A
ALS
LENGTH
EVAPORATOR
CENTER OF GRAVITY
UNIT
UNIT WEIGHTS lb (kg)
STANDARD UNIT
ADD’L WT.
SIZE
A
B
C
D
E
X
Y
OPERATING
SHIPPING
FOR COPPER
FINS
125A
228.7
(5809)
228.7
(5809)
228.7
(5809)
228.7
(5809)
263.4
(6690)
263.4
(6690)
263.4
(6690)
263.4
(6690)
117.6 (2987)
13.8 (351)
28.7 (729)
19.4 (493)
104.3 (2649)
41.7 (1059)
9920 (4500)
9600 (4355)
1652 (750)
118.5 (3010)
12.9 (328)
28.7 (729)
19.4 (493)
104.3 (2649)
41.7 (1059)
10350 (4700)
9900 (4355)
1652 (750)
118.5 (3010)
12.9 (328)
28.7 (729)
19.4 (493)
105.2 (2672)
41.7 (1059)
10670 (4840)
10250 (4650)
1652 (750)
118.5 (3010)
12.9 (328)
28.7 (729)
19.4 (493)
105.2 (2672)
41.7 (1059)
10750 (4880)
10350 (4700)
1652 (750)
153.2 (3891)
47.6
(1209)
47.6
(1209)
47.6
(1209)
48.5
(1232)
28.7 (729)
19.4 (493)
113.1 (2873)
41.7 (1059)
11250 (5100)
10850 (4920)
1930 (876)
28.7 (729)
19.4 (493)
113.1 (2873)
41.7 (1059)
11250 (5100)
10850 (4920)
1930 (876)
27.3 (693)
20.4 (518)
115.2 (2926)
41.7 (1059)
11500 (5218)
11100 (5036)
1930 (876)
25.7 (653)
20.2 (513)
116.5 (2959)
41.7 (1059)
12570 (5701)
11980 (5433)
2025 (918)
140A
155A
170A
175A
185A
195A
204A
ALS
UNIT
153.2 (3891)
153.2 (3891)
152.2 (3866)
COMPRESSOR
FANS
OPERATING REFRIGERANT
CHARGE (R-22) lb (kg))
SIZE
QTY.
NOM. TONS
QTY.
H.P.
125A
140A
155A
170A
175A
185A
195A
204A
2
2
2
2
2
2
2
2
65/65
65/80
80/80
80/95
80/95
95/95
95/95
95/95
10
10
12
12
14
14
14
14
1.5
1.5
1.5
1.5
1.5
1.5
1.5
2.0
26
SYSTEM #1
140
140
150
150
160
160
170
195
(63.5)
(63.5)
(68.1)
(68.1)
(72.6)
(72.6)
(77.1)
(88.5)
SYSTEM #2
140
150
150
160
160
160
170
195
(63.5)
(68.1)
(68.1)
(72.6)
(72.6)
(72.6)
(77.1)
(88.5)
IOMM ALS
Figure 20, ALS 205A-280A
ALS
UNIT
SIZE
205A
220A
235A
250A
265A
280A
CENTER OF GRAVITY
X
146.7
146.7
146.7
146.7
146.7
146.7
3,726
3,726
3,726
3,726
3,726
3,726
IOMM ALS
Y
41.7
41.7
41.7
41.7
41.7
41.7
UNIT WEIGHTS lb (kg)
OPERATING
1,059
1,059
1,059
1,059
1,059
1,059
15,930
15,980
16,180
16,200
16,200
16,250
7,224
7,247
7,338
7,347
7,347
7,370
SHIPPING
15,250
15,330
15,630
15,530
15,600
15,650
6,916
6,952
7,043
7,075
7,075
7,098
ADD’L WEIGHT
FOR COPPER
COMPRESORS
FANS
FIN COILS
2,478
2,478
2,478
2,478
2,478
2,478
1,124
1,124
1,124
1,124
1,124
1,124
OPERATING REFREGERANT
CHARGE (R-22) lb (kg)
SYSTEM #1 SYSTEM #2 SYSTEM #3
3
3
3
3
3
3
65/65/80
65/80/80
80/80/80
80/80/95
80/95/95
95/95/95
16
16
18
18
18
18
1.5
1.5
1.5
1.5
1.5
1.5
140
140
150
150
150
160
63.5
63.5
68.1
68.1
68.1
72.6
140
150
150
150
160
160
63.5
68.1
68.1
68.1
72.6
72.6
150
150
150
160
160
160
68.1
68.1
68.1
72.6
72.6
72.6
27
Figure 21, ALS 300-340
ALS CENTER OF GRAVITY
UNIT
SIZE
300A
315A
330A
340A
28
X
166.9
166.9
166.9
166.9
Y
4239
4239
4239
4239
41.7
41.7
41.7
41.7
UNIT WEIGHTS lb (kg)
OPERATING
1059
1059
1059
1059
21,250
21,250
21,320
21,230
9637
9637
9669
9669
SHIPPING
20,300
20,300
20,400
20,400
9206
9206
9252
9252
ADD’L WEIGHT
FOR COPPER
FIN COILS
3,671
3,671
3,671
3,671
1665
1665
1665
1665
COMPRESSORS
FANS
QTY NOM.TONS QTY
4
4
4
4
65/65/80/80
65/80/80/80
80/80/80/80
80/80/80/95
20
20
20
20
REFRIGERANT CHARGE (R-22) lb (kg)
HP
SYST. #1
SYST. #2
SYST. #3
SYST. #4
2.0
2.0
2.0
2.0
155
155
160
160
155
160
160
160
160
160
160
160
160
160
160
170
70.3
70.3
72.6
72.6
70.3
72.6
72.6
72.6
72.6
72.6
72.6
72.6
72.6
72.6
72.6
77.1
IOMM ALS
Figure 22, ALS 360-425
ALS CENTER OF GRAVITY
UNIT
SIZE
360A
370A
380A
425A
X
185.0
185.0
185.0
192.4
4699
4699
4699
4887
IOMM ALS
Y
41.7
41.7
41.7
41.1
UNIT WEIGHTS lb (kg)
OPERATING
1059
1059
1059
1044
22,920
22,970
23,020
23813
10395
10417
10440
10800
SHIPPING
22,000
22,050
22,100
22715
9977
10000
10023
10302
ADD’L WEIGHT
FOR COPPER
COMPRESSORS
FIN COILS
4,406
4,406
4,406
4406
1998
1998
1998
1998
FANS
NOM.
4
4
4
4
80/80/95/95
80/95/95/95
95/95/95/95
95/95/95/95
24
24
24
24
2.0
2.0
2.0
2.5
REFRIGERANT CHARGE (R-22) lb (kg)
SYST. #1
SYST. #2
SYST. #3
SYST. #4
175
175
180
190
175
180
180
190
180
180
180
190
180
180
180
190
79.4
79.4
81.6
86.2
79.4
81.6
81.6
86.2
81.6
81.6
81.6
86.2
81.6
81.6
81.6
86.2
29
Electrical Data
Field Wiring
General
Wiring must comply with all applicable codes and ordinances. Warranty is voided if wiring is not in
accordance with specifications. An open fuse indicates a short, ground, or overload. Before
replacing a fuse or restarting a compressor or fan motor, the trouble must be found and corrected.
Copper wire is required for all power lead terminations at the unit and copper must be used for all other
wiring to the unit.
ALS units may be ordered with main power wiring for either single or multiple point power connection.
If single point power connection is ordered, a single large power terminal block is provided and wiring
within the unit is sized in accordance with the National Electrical code. A single field supplied
disconnect is required. An optional factory mounted transformer for the 115 volt control circuit may
be provided.
If multiple point power wiring is ordered, two power connections (125 through 204 and 300 through
425) or three power connections (205 through 280) are required and wiring within the unit is sized in
accordance with the National Electrical Code. A separate circuit is required for the 115 volt control
circuit. Separate field supplied disconnects are required for each electrical circuit.
It may be desirable to have the unit evaporator heater on a separate disconnect switch from the main
unit power supply so that the unit may be shut down without defeating the freeze protection provided
by the cooler heater.
CAUTION
ALS unit compressors are single direction rotation compressors. For this reason proper phasing of
electrical power is important. Electrical phasing must be A, B, C for electrical phases 1, 2 and 3 (A=L1,
B=L2, C=L3). Units supplied with single point factory power connections will include one MotorSaver
phase failure, phase reversal protective device that will prevent operation of the unit with incorrect
power phasing. The MotorSaver is factory wired and tested. Do not alter the wiring to the
MotorSaver.
Multiple point power wired units will include two (125 through 204) and (300 through 425) or three (205
through 280) MotorSaver safety controls (one for each power supply), and the contractor is cautioned
to not apply power until the phasing is verified with a phase sequence meter.
WARNING
Internal power wiring to the compressors for the single point versus the multiple point option are
different. It is imperative that the proper field wiring be installed according to the way the unit is built.
Overload Dial Setting
For units with 1 contactor and 1 overload per compressor: The Overload must be set at a "Must Hold
Dial Setting" equal to 125% of the compressor RLA listed on the unit data plate.
For units with 2 contactors and 2 overloads per compressor: The Overload must be set at a "Must
Hold Dial Setting" equal to 125% of half the compressor RLA listed on the unit data plate.
Note: The "Must Trip Amps" is 12% higher than the "Must Hold Dial Setting". The accuracy of the
Overload Setting is ±2%.
30
IOMM ALS
Wire Sizing Ampacities
Table 30, Single Point Connection, ALS 070-100
MINIMUM
ALS
UNIT
SIZE
VOLTS
070A
208
230
380
460
575
080A
208
230
380
460
575
090A
208
230
380
460
575
100A
208
230
380
460
575
POWER SUPPLY
HZ
CIRCUIT
AMPACITY
(MCA)
FIELD WIRE
QTY.
WIRE
GUAGE
60
335
307
185
153
124
3
3
3
3
3
60
410
375
227
187
150
FIELD FUSE SIZE
HUB
QTY.
NOMINAL
SIZE
RECOMMENDED
MAXIMUM
400
350
3/0
2/0
#1
1
1
1
1
1
3.0
2.5
2.0
1.5
1.5
500
400
250
200
175
500
500
300
250
200
3
3
3
3
3
600
500
4/0
3/0
1/0
1
1
1
1
1
3.0
3.0
2.0
1.5
1.5
500
500
300
250
200
700
600
350
300
250
60
475
434
262
216
173
3
3
3
3
3
350
300
300
4/0
2/0
2
2
1
1
1
2.5
2.5
2.5
2.0
1.5
600
600
350
300
225
800
700
450
350
250
60
475
434
262
216
173
3
3
3
3
3
350
300
300
4/0
2/0
2
2
1
1
1
2.5
2.5
2.5
2.0
1.5
600
600
350
300
225
800
700
450
350
250
(*) Table based on 75°C field wire per NEC
IOMM ALS
31
Table 31, Single Point Connection, ALS 125-204
MINIMUM
ALS
UNIT
SIZE
125A
140A
155A
170A
175A
185A
195A
204A
VOLTS
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208*
230
380
460
575
208*
230
380
460
575
208*
230
380
460
575
POWER SUPPLY
HZ
CIRCUIT
AMPACITY
(MCA)
FIELD WIRE
QTY.
WIRE
GUAGE
60
598
548
331
273
221
6
6
3
3
3
60
673
616
372
307
247
FIELD FUSE SIZE
HUB
QTY.
NOMINAL
SIZE
RECOMMENDED
MAXIMUM
350
300
400
300
4/0
2
2
1
1
1
2.5
2.5
3.0
2.5
2.0
700
600
400
300
250
800
700
450
350
300
6
6
3
3
3
500
350
500
350
250
2
2
1
1
1
3.0
2.5
3.0
2.5
2.5
800
700
450
400
300
800
800
500
400
350
60
745
682
412
340
273
6
6
6
3
3
500
500
#4/0
500
300
2
2
2
1
1
3.0
3.0
2.0
3.0
2.5
800
800
500
400
300
1000
800
500
450
350
60
799
730
441
364
292
6
6
6
3
3
600
500
#4/0
500
350
2
2
2
1
1
3.0
3.0
2.0
3.0
2.5
1000
800
500
450
350
1000
1000
600
500
400
60
810
741
448
369
296
6
6
6
3
3
600
500
250
500
350
2
2
2
1
1
3.0
3.0
2.5
3.0
2.5
1000
1000
500
450
350
1000
1000
600
500
400
60
853*
779
471
388
311
6
6
6
6
3
600*
600
250
#3/0
400
2
2
2
2
1
3.0
3.0
2.5
2.0
2.5
1000
1000
500
450
350
1000
1000
600
500
400
60
853*
779
471
388
311
6
6
6
6
3
600*
600
250
#3/0
400
2
2
2
2
1
3.0
3.0
2.5
2.0
2.5
1000
1000
500
450
350
1000
1000
600
500
400
60
881*
799
481
399
321
6
6
6
6
3
600*
600
250
#3/0
400
2
2
2
2
1
3.0
3.0
2.5
2.0
2.5
1000
1000
500
500
400
1200
1000
600
500
400
(*) Field wire size values apply to 90°C rated wire per NEC
32
IOMM ALS
Table 32, Single Point Connection, ALS 205-425
MINIMUM
POWER SUPPLY
ALS
UNIT
SIZE
VOLTS
HZ
CIRCUIT
AMPACITY
(MCA)
FIELD WIRE
QTY.
WIRE
GUAGE
205A
380
460
575
60
525
433
349
6
6
2
220A
380
460
575
60
558
460
370
235A
380
460
575
60
250A
380
460
575
265A
FIELD FUSE SIZE
HUB
QTY.
NOMINAL
SIZE
RECOMMENDED
MAXIMUM
300
#4/0
#3/0
2
2
2
2.0
2.0
1.5
600
500
400
600
500
450
6
6
6
300
#4/0
#3/0
2
2
2
2.0
2.0
1.5
700
500
450
700
500
450
597
492
395
6
6
6
350
250
#3/0
2
2
2
2.5
2.0
1.5
700
600
450
700
600
500
60
626
516
414
6
6
6
400
300
#4/0
2
2
2
2.5
2.0
2.0
700
600
500
800
600
500
380
460
575
60
649
535
429
6
6
6
400
300
#4/0
2
2
2
2.5
2.0
2.0
800
600
500
800
600
500
280A
380
460
575
60
672
554
444
6
6
6
500
300
#4/0
2
2
2
3.0
2.0
2.0
800
600
500
800
700
500
300A
380
460
575
60
723
596
481
6
6
6
500
350
250
2
2
2
3.0
2.5
2.0
800
700
500
800
700
500
315A
380
460
575
60
756
623
502
6
6
6
500
400
250
2
2
2
3.0
2.5
2.0
800
700
600
800
700
600
330A
380
460
575
60
789
650
523
6
6
6
600
400
300
2
2
2
3.0
2.5
2.0
800
700
600
800
700
600
340A
380
460
575
60
818
674
542
6
6
6
600
500
300
2
2
2
3.0
3.0
2.0
1000
800
600
1000
800
600
360A
380*
460
575
60
859
707
569
6
6
6
600
500
300
2
2
2
3.0
3.0
2.0
1000
800
600
1000
800
600
370A
380*
460
575
60
882
726
584
6
6
6
600
500
350
2
2
2
3.0
3.0
2.5
1000
800
700
1000
800
700
380A
380*
460
575
60
905
745
599
6
6
6
600
500
350
2
2
2
3.0
3.0
2.5
1000
800
700
1000
800
700
425A
380*
460
575
60
931
770
619
6
6
6
600
600
350
2
2
2
3.0
3.0
2.5
1000
800
700
1000
800
700
Note: Table based on 75°C field wire except for 380V ALS 360, 370, and 425 which require 90°C field wire,
IOMM ALS
33
Table 33, Multiple Point Connection, ALS 125-204
ELECTRICAL CIRCUIT #1
ALS
UNIT
SIZE
VOLTS
125A
208
230
380
460
575
140A
208
230
380
460
575
155A
208
230
380
460
575
170A
208
230
380
460
575
175A
208
230
380
460
575
185A
208
230
380
460
575
195A
208
230
380
460
575
204A
208
230
380
460
575
34
HZ
MINIMUM
CIRCUIT
AMPS
(MCA)
POWER SUPPLY
FIELD WIRE
HUB
WIRE
HUB
QTY
GAUGE
QTY
SIZE
ELECTRICAL CIRCUIT #2
FIELD FUSING
REC
MAX
Fuse
FUSE
SIZE
SIZE
MINIMUM
CIRCUIT
AMPS
(MCA)
POWER SUPPLY
FIELD WIRE
HUB
WIRE
HUB
QTY
GAUGE
QTY
SIZE
FIELD FUSING
REC
MAX
FUSE
FUSE
SIZE
SIZE
60
329
301
182
150
122
3
3
3
3
3
400
350
#3/0
#1/0
#1
1
1
1
1
1
3.0
2.5
2.0
1.5
1.5
400
400
225
200
150
500
500
300
250
200
329
301
182
150
122
3
3
3
3
3
400
350
#3/0
#1/0
#1
1
1
1
1
1
3.0
2.5
2.0
1.5
1.5
400
400
225
200
150
500
500
300
250
200
60
329
301
182
150
122
3
3
3
3
3
400
350
#3/0
#1/0
#1
1
1
1
1
1
3.0
2.5
2.0
1.5
1.5
400
400
225
200
150
500
500
300
250
200
404
369
223
184
148
6
3
3
3
3
#4/0
500
#4/0
#3/0
#1/0
2
1
1
1
1
2.0
3.0
2.0
2.0
1.5
500
500
300
250
200
700
600
350
300
250
60
410
375
226
187
150
6
3
3
3
3
#4/0
500
#4/0
#3/0
#1/0
2
1
1
1
1
2.0
3.0
2.0
2.0
1.5
500
500
300
250
200
700
600
350
300
250
410
375
226
187
150
6
3
3
3
3
#4/0
500
#4/0
#3/0
#1/0
2
1
1
1
1
2.0
3.0
2.0
2.0
1.5
500
500
300
250
200
700
600
350
300
250
60
410
375
226
187
150
6
3
3
3
3
#4/0
500
#4/0
#3/0
#1/0
2
1
1
1
1
2.0
3.0
2.0
2.0
1.5
500
500
300
250
200
700
600
350
300
250
464
423
255
211
169
6
6
3
3
3
250
#4/0
250
#4/0
#2/0
2
2
1
1
1
2.5
2.0
2.5
2.0
1.5
600
500
350
250
225
800
700
400
350
250
60
416
381
230
190
152
6
6
3
3
3
#4/0
#3/0
#4/0
#3/0
#2/0
2
2
1
1
1
2.0
2.0
2.0
2.0
1.5
500
500
300
250
200
700
600
350
300
250
470
429
259
214
171
6
6
3
3
3
250
#4/0
300
#4/0
#2/0
2
2
1
1
1
2.5
2.0
2.5
2.0
1.5
600
500
350
250
225
800
700
400
350
250
60
470
429
259
214
171
6
6
3
3
3
250
#4/0
300
#4/0
#2/0
2
2
1
1
1
2.5
2.0
2.5
2.0
1.5
600
500
350
250
225
800
700
400
350
250
470
429
259
214
171
6
6
3
3
3
250
#4/0
300
#4/0
#2/0
1
1
1
1
1
2.5
2.0
2.5
2.0
1.5
600
500
350
250
225
800
700
400
350
250
60
470
429
259
214
171
6
6
3
3
3
250
#4/0
300
#4/0
#2/0
2
2
1
1
1
2.5
2.0
2.5
2.0
1.5
600
500
350
250
225
800
700
400
350
250
470
429
259
214
171
6
6
3
3
3
250
#4/0
300
#4/0
#2/0
1
1
1
1
1
2.5
2.0
2.5
2.0
1.5
600
500
350
250
225
800
700
400
350
250
60
484
439
284
219
176
6
6
3
3
3
250
#4/0
300
#4/0
#3/0
2
2
1
1
1
2.5
2.0
2.5
2.0
2.0
700
600
400
300
250
800
700
450
350
300
484
439
264
219
176
6
6
3
3
3
250
#4/0
300
#4/0
#3/0
2
2
1
1
1
2.5
2.0
2.5
2.0
2.0
700
600
400
300
250
800
700
450
350
300
IOMM ALS
Table 34, Multiple Point Connection, ALS 205-280
ELECTRICAL CIRCUIT #1
ALS
UNIT
SIZE
VOLTS
205A
208
230
380
460
575
220A
208
230
380
460
575
235A
208
230
380
460
575
250A
208
230
380
460
575
265A
208
230
380
460
575
280A
208
230
380
460
575
ELECTRICAL CIRCUIT #2
MIN.
CIRCUIT
AMPS
(MCA)
POWER SUPPLY
FIELD WIRE
HUB
WIRE
HUB
QTY
GAUGE
QTY
SIZE
FIELD FUSING
REC
MAX
FUSE
FUSE
SIZE
SIZE
MIN.
CIRCUIT
AMPS
(MCA)
POWER SUPPLY
FIELD WIRE
HUB
WIRE
HUB
QTY
GAUGE
QTY
SIZE
FIELD FUSING
REC
MAX
FUSE
FUSE
SIZE
SIZE
60
329
302
182
150
122
3
3
3
3
3
400
350
#3/0
#1/0
#1/0
1
1
1
1
1
2.5
2.5
1.5
1.25
1.25
400
400
250
200
175
500
500
300
250
200
329
302
182
150
122
3
3
3
3
3
400
350
#3/0
#1/0
#1/0
1
1
1
1
1
2.5
2.5
1.5
1.25
1.25
400
400
250
200
175
500
500
300
250
200
60
329
302
182
150
122
3
3
3
3
3
400
350
#3/0
#1/0
#1/0
1
1
1
1
1
2.5
2.5
1.5
1.25
1.25
400
400
250
200
175
500
500
300
250
200
410
375
223
187
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3
3
2
1.5
1.25
600
500
300
250
200
700
600
350
300
250
60
410
375
227
184
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3
3
2
1.5
1.25
600
500
300
250
200
700
600
350
300
250
410
375
227
187
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3
3
2
1.5
1.25
600
500
300
250
200
700
600
350
300
250
60
410
375
227
187
150
6
3
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3
3
2
1.5
1.25
600
500
300
250
200
700
600
350
300
250
410
375
227
187
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3
3
2
1.5
1.25
600
500
300
250
200
700
600
350
300
250
60
410
375
227
187
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3
3
2
1.5
1.25
600
500
300
250
200
700
600
350
300
250
464
423
256
211
170
6
6
3
3
3
350
300
250
#4/0
#2/0
1
1
1
1
1
3.5
3
2
2
1.5
700
600
350
300
250
800
700
400
350
250
60
464
423
256
211
170
6
6
3
3
3
350
300
250
#4/0
#2/0
1
1
1
1
1
3.5
3
2
2
1.5
700
600
350
300
250
800
700
400
350
250
464
423
256
211
170
6
6
3
3
3
350
300
250
#4/0
#2/0
1
1
1
1
1
3.5
3
2
2
1.5
700
600
350
300
250
800
700
400
350
250
HZ
Note: Circuit #3 continued on next page
IOMM ALS
35
Table 34, Multiple Point Connection, ALS 205-280 (Continued)
ELECTRICAL CIRCUIT #3
ALS
UNIT
SIZE
36
MINIMUM
VOLTS
205A
208
230
380
460
575
220A
208
230
380
460
575
235A
208
230
380
460
575
250A
208
230
380
460
575
265A
208
230
380
460
575
280A
208
230
380
460
575
HZ
CIRCUIT
AMPS
(MCA)
POWER SUPPLY
FIELD WIRE
WIRE
QTY
GAUGE
HUB
HUB
QTY
SIZE
FIELD
FUSING
REC
MAX
FUSE
FUSE
SIZE
SIZE
60
410
375
227
187
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3.0
3.0
2.0
1.5
1.25
600
500
300
250
200
700
600
350
300
250
60
410
375
227
187
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3.0
3.0
2.0
1.5
1.25
600
500
300
250
300
700
600
350
300
250
60
410
375
227
187
150
6
6
3
3
3
300
250
#4/0
#3/0
#1/0
1
1
1
1
1
3.0
3.0
2.0
1.5
1.25
600
500
300
250
200
700
600
350
300
250
60
464
423
256
211
170
6
6
3
3
3
350
300
250
#4/0
#2/0
1
1
1
1
1
3.5
3.0
2.0
2.0
1.5
700
600
350
300
250
800
700
400
350
250
60
464
423
256
211
170
6
6
3
3
3
350
300
250
#4/0
#2/0
1
1
1
1
1
3.5
3.0
2.0
2.0
1.5
700
600
350
300
250
800
700
400
350
250
60
464
423
256
211
170
6
6
3
3
3
350
300
250
#4/0
#2/0
1
1
1
1
1
3.5
3.0
2.0
2.0
1.5
700
600
350
300
250
800
700
400
250
250
IOMM ALS
Table 35, Multiple Point Connection, ALS 300-425
ELECTRICAL CIRCUIT #1 & 3
ALS
UNIT
SIZE
VOLTS
300A
208
230
380
460
575
315A
208
230
380
460
575
330A
208
230
380
460
575
340A
208
230
380
460
575
360A
208
230
380
460
575
370A
208*
230
380
460
575
380A
208*
230
380
460
575
425A
208*
230
380
460
575
HZ
MIN.
CIRCUIT
AMPS
(MCA)
POWER SUPPLY
FIELD WIRE
HUB
WIRE
HUB
QTY
GAUGE
QTY
SIZE
ELECTRICAL CIRCUIT #2 & 4
FIELD FUSING
REC
MAX
FUSE
FUSE
SIZE
SIZE
MIN.
CIRCUIT
AMPS
(MCA)
POWER SUPPLY
FIELD WIRE
HUB
WIRE
HUB
QTY
GAUGE
QTY
SIZE
FIELD FUSING
REC
MAX
FUSE
FUSE
SIZE
SIZE
60
693
630
382
315
254
6
6
6
3
3
500
400
250
400
250
2
2
1
1
1
3.0
2.5
3.0
2.5
2.0
800
800
450
400
350
800
800
500
450
350
693
630
382
315
254
6
6
6
3
3
500
400
250
400
250
2
2
1
1
1
3.0
2.5
3.0
2.5
2.0
800
800
450
400
350
800
800
500
450
350
60
693
630
382
315
254
6
6
6
3
3
500
400
250
400
250
2
2
1
1
1
3.0
2.5
3.0
2.5
2.0
800
800
450
400
350
800
800
500
450
350
753
684
415
342
275
6
6
6
3
3
500
400
300
400
250
2
2
1
1
1
3.0
3.0
3.0
3.0
2.0
1000
800
500
400
350
1000
800
500
450
350
60
753
684
415
342
275
6
6
6
3
3
500
500
300
500
300
2
2
1
1
1
3.0
3.0
3.0
3.0
2.0
1000
800
500
400
350
1000
800
500
450
350
753
684
415
342
275
6
6
6
3
3
500
500
300
500
300
2
2
1
1
1
3.0
3.0
3.0
3.0
2.0
1000
800
500
400
350
1000
800
500
450
350
60
753
684
415
342
275
6
6
6
3
3
500
500
300
500
300
2
2
1
1
1
3.0
3.0
3.0
3.0
2.0
1000
800
500
400
350
1000
800
500
450
350
807
732
444
366
294
6
6
6
3
3
600
500
300
500
350
2
2
1
1
1
3.0
3.0
3.0
3.0
2.5
1000
1000
500
450
350
1000
1000
600
500
400
60
822
746
453
373
300
6
6
6
3
3
600
500
300
500
350
2
2
1
1
1
3.0
3.0
3.0
3.0
2.5
1000
1000
500
450
400
1000
1000
600
500
400
822
746
453
373
300
6
6
6
3
3
600
500
300
500
350
2
2
1
1
1
3.0
3.0
3.0
3.0
2.5
1000
1000
500
450
400
1000
1000
600
500
400
60
822
746
453
373
300
6
6
6
3
3
600
500
300
500
350
2
2
1
1
1
3.0
3.0
3.0
3.0
2.5
1000
1000
500
450
400
1000
1000
600
500
400
865
784
476
392
315
6
6
6
3
3
600
600
350
600
400
2
2
1
1
1
3.0
3.0
3.5
3.0
2.5
1000
1000
500
450
400
1000
1000
600
500
400
60
865
784
476
392
315
6
6
6
3
3
600
600
350
600
400
2
2
1
1
1
3.0
3.0
3.5
3.0
2.5
1000
1000
500
450
400
1000
1000
600
500
400
865
784
476
392
315
6
6
6
3
3
600
600
350
600
400
2
2
1
1
1
3.0
3.0
3.5
3.0
2.5
1000
1000
500
450
400
1000
1000
600
500
400
60
892
808
489
404
325
6
6
6
3
3
600
600
350
600
400
2
2
1
1
1
3.0
3.0
3.0
3.0
2.5
1200
1000
500
500
400
1200
1000
600
500
400
892
808
489
404
325
6
6
6
3
3
1200
1000
600
500
400
2
2
1
1
1
3.0
3.0
3.0
3.0
2.5
1200
1000
600
500
400
1200
1000
600
500
400
Note: Table based on 75°C field wire except 208V ALS 370 and 380 which require 90°C field wire
IOMM ALS
37
Compressor and Condenser Fan Motors
Table 36, Amp Draw, ALS 070-100
ALS
UNIT
SIZE
VOLTS
070A
208
230
380
460
575
080A
208
230
380
460
575
090A
208
230
380
460
575
100A
208
230
380
460
575
RATED LOAD AMPS
FAN
NUMBER
HZ
COMPRESSOR
MOTORS
FLA
(EACH)
OF
FAN
MOTORS
FAN
MOTORS
(EACH)
LOCKED ROTOR AMPS
ACROSS-THE-LINE
REDUCED INRUSH
60
240
218
132
109
88
5.8
5.8
3.4
2.8
2.3
6
6
6
6
6
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
300
272
165
136
109
5.8
5.8
3.4
2.8
2.3
6
6
6
6
6
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
5.8
2.8
3.4
2.8
2.3
8
8
8
8
8
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
5.8
2.8
3.4
2.8
2.3
8
8
8
8
8
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
COMPRESSOR
Table 37, Amp Draw, ALS 125-170
ALS
UNIT
SIZE
VOLTAGE
125A
208
230
380
460
575
140A
208
230
380
460
575
155A
208
230
380
460
575
170A
208
230
380
460
575
38
RATED LOAD AMPS
FAN
COMPRESSORS
NO. OF
FAN
MOTORS
FAN
MOTORS
(EACH)
LOCKED ROTOR AMPS
ACROSS-THE-LINE
REDUCED INRUSH
NO. 1
NO. 2
MOTORS
FLA
(EACH)
60
240
218
132
109
88
240
218
132
109
88
5.8
5.8
3.4
2.8
2.3
10
10
10
10
10
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
240
218
132
109
88
300
272
165
136
109
5.8
5.8
3.4
2.8
2.3
10
10
10
10
10
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
300
272
165
136
109
300
272
165
136
109
5.8
5.8
3.4
2.8
2.3
12
12
12
12
12
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
300
272
165
136
109
343
310
188
155
124
5.8
5.8
3.4
2.8
2.3
12
12
12
12
12
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
HZ
PER COMPRESSORP
IOMM ALS
Table 38, Amp Draw, ALS 175-204
ALS
UNIT
SIZE
VOLTAGE
175A
208
230
380
460
575
185A
208
230
380
460
575
195A
208
230
380
460
575
204A
208
230
380
460
575
RATED LOAD AMPS
FAN
COMPRESSORS
NO. OF
FAN
MOTORS
FAN
MOTORS
(EACH)
LOCKED ROTOR AMPS
NO. 1
NO. 2
MOTORS
FLA
(EACH)
ACROSS-THE-LINE
REDUCED INRUSH
60
300
272
165
136
109
343
310
188
155
124
5.8
5.8
3.4
2.8
2.3
14
14
14
14
14
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
343
310
188
155
124
5.8
5.8
3.4
2.8
2.3
14
14
14
14
14
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
343
310
188
155
124
5.8
5.8
3.4
2.8
2.3
14
14
14
14
14
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
343
310
188
155
124
7.8
7.2
4.1
3.6
3.0
14
14
14
14
14
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
HZ
PER COMPRESSORP
Table 39, Amp Draw, ALS 205-280
ALS
UNIT
SIZE
VOLTAGE
205A
208
230
380
460
575
220A
208
230
380
460
575
235A
208
230
380
460
575
250A
208
230
380
460
575
265A
208
230
380
460
575
280A
208
230
380
460
575
IOMM ALS
RATED LOAD AMPS
FAN
COMPRESSORS
NO. OF
FAN
MOTORS
FAN
MOTORS
(EACH)
LOCKED ROTOR AMPS
NO. 1
NO. 2
NO. 3
MOTORS
FLA
(EACH)
ACROSS-THE-LINE
REDUCED INRUSH
60
240
218
132
109
88
240
218
132
109
88
300
272
165
136
109
5.8
5.8
3.4
2.8
2.3
16
16
16
16
16
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
240
218
132
109
88
300
272
165
136
109
300
272
165
136
109
5.8
5.8
3.4
2.8
2.3
16
16
16
16
16
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
300
272
165
136
109
300
272
165
136
109
300
272
165
136
109
5.8
5.8
3.4
2.8
2.3
18
18
18
18
18
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
300
272
165
136
109
300
272
165
136
109
343
310
188
155
124
5.8
5.8
3.4
2.8
2.3
18
18
18
18
18
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
300
272
165
136
109
343
310
188
155
124
343
310
188
155
124
5.8
5.8
3.4
2.8
2.3
18
18
18
18
18
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
343
310
188
155
124
343
310
188
155
124
5.8
5.8
3.4
2.8
2.3
18
18
18
18
18
23.7
21.4
14.4
10.7
11.5
1459
1628
943
764
589
934
1042
604
489
377
HZ
PER COMPRESSORP
39
Table 40, Motor Amps, ALS 300-425
ALS
UNIT
SIZE
VOLTAGE
300A
208
230
380
460
575
315A
208
230
380
460
575
330A
208
230
380
460
575
340A
208
230
380
460
575
360A
208
230
380
460
575
370A
208
230
380
460
575
380A
208
230
380
460
575
425A
208
230
380
460
575
40
RATED LOAD AMPS
FAN
COMPRESSORS
NO. OF
FAN
MOTORS
FAN
MOTORS
(EACH)
LOCKED ROTOR AMPS
NO. 1
NO. 2
NO. 3
NO. 4
MOTORS
FLA
(EACH)
60
240
218
132
109
88
240
218
132
109
88
300
272
165
136
109
300
272
165
136
109
7.8
7.2
4.1
3.6
3.0
20
20
20
20
20
60
240
218
132
109
88
300
272
165
136
109
300
272
165
136
109
300
272
165
136
109
7.8
7.2
4.1
3.6
3.0
60
300
272
165
136
109
300
272
165
136
109
300
272
165
136
109
300
272
165
136
109
60
300
272
165
136
109
300
272
165
136
109
300
272
165
136
109
60
300
272
165
136
109
300
272
165
136
109
60
300
272
165
136
109
HZ
PER COMPRESSORP
ACROSS-THELINE
REDUCED INRUSH
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
20
20
20
20
20
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
7.8
7.2
4.1
3.6
3.0
20
20
20
20
20
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
343
310
188
155
124
7.8
7.2
4.1
3.6
3.0
20
20
20
20
20
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
343
310
188
155
124
343
310
188
155
124
7.8
7.2
4.1
3.6
3.0
24
24
24
24
24
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
343
310
188
155
124
343
310
188
155
124
343
310
188
155
124
7.8
7.2
4.1
3.6
3.0
24
24
24
24
24
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
343
310
188
155
124
343
310
188
155
124
343
310
188
155
124
7.8
7.2
4.1
3.6
3.0
24
24
24
24
24
30.5
27.6
20.0
13.8
11.5
1459
1628
943
764
589
934
1042
604
489
377
60
343
310
188
155
124
343
310
188
155
124
343
310
188
155
124
343
310
188
155
124
10.0
9.2
5.5
4.6
3.8
24
24
24
24
24
48.1
43.5
26.4
21.8
17.4
1459
1628
943
764
589
934
1042
604
489
377
IOMM ALS
Customer Wiring
Table 41, Customer Wiring with Single Point Connection (ALS 070-204)
WIRING TO UNIT POWER BLOCK
ALS
UNIT SIZE
VOLTS
TERMINAL SIZE
AMPS
070A
208
230
380
460
575
080A
208
230
380
460
575
090A
208
230
380
460
575
100A
208
230
380
460
575
125A
208
230
380
460
575
140A
208
230
380
460
575
155A
208
230
380
460
575
170A
208
230
380
460
575
175A
208
230
380
460
575
185A
208
230
380
460
575
195A
208
230
380
460
575
204A
IOMM ALS
HZ
208
230
380
460
POWER BLOCK
CONNECTOR WIRE RANGE
(COPPER WIRE ONLY)
WIRING TO DISCONNECT SWITCH
OPTIONAL DISCONNECT SWITCH
CONNECTOR WIRE RANGE
SIZE
(COPPER WIRE ONLY)
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
to
to
to
to
to
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
400
400
400
150
150
(1) 250 to 500 MCM
(1) 250 to 500 MCM
(1) 250 to 500 MCM
(1) #2 to 3/0
(1) #2 to 3/0
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
to
to
to
to
to
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
400
400
250
250
250
(1) 250 to 500 MCM
(1) 250 to 500 MCM
(1) #4 to 350 MCM
(1) #4 to 350 MCM
(1) #2 to 3/0
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
to
to
to
to
to
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
600
400
250
250
250
(1) 250 to 500 MCM
(1) 250 to 500 MCM
(1) #4 to 350 MCM
(1) #4 to 350 MCM
(1) #4 to 350 MCM
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
to
to
to
to
to
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
600
400
250
250
250
(1) 250 to 500 MCM
(1) 250 to 500 MCM
(1) #4 to 350 MCM
(1) #4 to 350 MCM
(1) #4 to 350 MCM
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
400
400
250
See note 9
See note 9
(1) 250 to 500 MCM
(1) 250 to 500 MCM
(1) #4 to 350 MCM
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
400
400
400
See note 9
See note 9
(1) 250 to 500 MCM
(1) 250 to 500 MCM
(1) 250 to 350 MCM
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
600
400
400
See note 9
See note 9
(2) 250 to 500 MCM
(1) 250 to 500 MCM
(1) 250 to 350 MCM
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
600
400
400
See note 9
See note 9
(2) 250 to 500 MCM
(1) 250 to 500 MCM
(1) 250 to 350 MCM
60
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
600
400
400
See note 9
See note 9
(2) 250 to 500 MCM
(1) 250 to 500 MCM
(1) 250 to 350 MCM
60
950
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
600
600
400
See note 9
See note 9
(2) 250 to 500 MCM
(2) 250 to 500 MCM
(1) 250 to 350 MCM
60
950
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
600
600
400
See note 9
See note 9
(2) 250 to 500 MCM
(2) 250 to 500 MCM
(1) 250 to 350 MCM
950
840
840
840
(2)
(2)
(2)
(2)
#2
#2
#2
#2
TO
TO
TO
TO
600
600
600
600
MCM
MCM
MCM
MCM
600
600
See note 9
See note 9
(2) 250 to 500 MCM
(2) 250 to 500 MCM
60
41
575
42
840
(2) #2 TO 600 MCM
400
(1) 250 to 350 MCM
IOMM ALS
Table 42, Customer Wiring With Single Point Connection, ALS 205-425
WIRING TO UNIT POWER BLOCK
ALS
UNIT SIZE
VOLTS
HZ
TERMINAL SIZE
AMPS
POWER BLOCK
CONNECTOR WIRE RANGE
(COPPER WIRE ONLY)
WIRING TO DISCONNECT SWITCH
OPTIONAL DISCONNECT SWITCH
CONNECTOR WIRE RANGE
SIZE
(COPPER WIRE ONLY)
205A
380
460
575
60
840
840
840
(2) #2 TO 600 MCM
(2) #2 TO 600 MCM
(2) #2 TO 600 MCM
600
600
400
(2) 250 to 500 MCM
(2) 250 to 500 MCM
(1) 250 to 350 MCM
220A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
600
600
400
(2) 250 to 500 MCM
(2) 250 to 500 MCM
(1) 250 to 500 MCM
235A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
600
600
400
(2) 250 to 500 MCM
(2) 250 to 500 MCM
(1) 250 to 500 MCM
250A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
800
600
600
(2) 500 to 750 MCM
(2) 250 to 500 MCM
(2) 250 to 500 MCM
265A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
800
600
600
(2) 500 to 750 MCM
(2) 250 to 500 MCM
(2) 250 to 500 MCM
280A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
800
600
600
(2) 500 to 750 MCM
(2) 250 to 500 MCM
(2) 250 to 500 MCM
300A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
800
800
600
(2) 400 to 700 MCM
(2) 400 to 700 MCM
(2) 250 to 500 MCM
315A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
1200
800
600
(2) 500 to 750 MCM
(2) 400 to 700 MCM
(2) 250 to 500 MCM
330A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
1200
800
600
(2) 500 to 750 MCM
(2) 400 to 700 MCM
(2) 250 to 500 MCM
340A
380
460
575
60
840
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
1200
800
600
(2) 500 to 750 MCM
(2) 400 to 700 MCM
(2) 250 to 500 MCM
360A
380
460
575
60
950
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
1200
800
800
(3) 500 to 750 MCM
(2) 400 to 700 MCM
(2) 250 to 500 MCM
370A
380
460
575
60
950
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
1200
800
800
(3) 500 to 750 MCM
(2) 400 to 700 MCM
(2) 400 to 700 MCM
380A
380
460
575
60
950
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
1200
1200
800
(3) 500 to 750 MCM
(3) 500 to 750 MCM
(2) 400 to 700 MCM
425A
380
460
575
60
950
840
840
(2) #2 to 600 MCM
(2) #2 to 600 MCM
(2) #2 to 600 MCM
1200
1200
800
(3) 500 to 750 MCM
(3) 500 to 750 MCM
(2) 400 to 700 MCM
IOMM ALS
43
Table 43, Customer Wiring With Multiple Point Power, ALS 125-204
WIRING TO UNIT POWER BLOCK
ALS
UNIT SIZE
44
VOLTS
125A
208
230
380
460
575
140A
208
230
380
460
575
155A
208
230
380
460
575
170A
208
230
380
460
575
175A
208
230
380
460
575
185A
208
230
380
460
575
195A
208
230
380
460
575
204A
208
230
380
460
575
HZ
TERMINAL SIZE (AMPS)
CKT 1
CKT 2
POWER BLOCK
CONNECTOR WIRE RANGE (COPPER WIRE ONLY)
CKT 1
CKT 2
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
IOMM ALS
Table 44, Customer Wiring With Multiple Point Power, ALS 205A-280A
WIRING TO UNIT POWER BLOCK
ALS
UNIT SIZES
VOLTS
205A
208
230
380
460
575
220A
208
230
380
460
575
235A
208
230
380
460
575
250A
208
230
380
460
575
265A
208
230
380
460
575
280A
208
230
380
460
575
IOMM ALS
HZ
POWER BLOCK
CONNECTOR WIRE RANGE (COPPER WIRE ONLY)
CKT 1
CKT 2
CKT 3
TERMINAL SIZE (AMPS)
CKT 1
CKT 2
CKT 3
60
840
840
840
840
840
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
45
Table 45, Customer Wiring With Multiple Point Wiring, ALS 300A-425A
WIRING TO UNIT POWER BLOCK
ALS
UNIT SIZE
300A
208
230
380
460
575
315A
208
230
380
460
575
330A
208
230
380
460
575
340A
208
230
380
460
575
360A
208
230
380
460
575
370A
208
230
380
460
575
380A
208
230
380
460
575
425A
46
VOLTS
208
230
380
460
575
HZ
TERMINAL SIZE (AMPS)
CKT 1
CKT 2
POWER BLOCK
CONNECTOR WIRE RANGE (COPPER WIRE ONLY)
CKT 1
CKT 2
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
840
840
840
840
840
840
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
950
840
840
840
840
950
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
950
840
840
840
840
950
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
60
950
840
840
840
840
950
840
840
840
840
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
(2)
(2)
(2)
(2)
(2)
#2
#2
#2
#2
#2
TO
TO
TO
TO
TO
600
600
600
600
600
MCM
MCM
MCM
MCM
MCM
IOMM ALS
Electrical Data Notes
1. Allowable voltage limits:
Unit nameplate plus or minus 10 percent.
2. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus 100% of
RLA of all other loads in the circuit including control transformer. Wire size ampacity for separate
115V control circuit power is 15 amps for ALS125A through ALS280A.
3. Compressor RLA values are for wire sizing purposes only but do reflect normal operating current
draw at unit rated capacity. If unit is equipped with SpeedTrol condenser fan motors, the first motor
on each refrigerant circuit is a single phase, 1 hp motor, with a FLA of 2.8 amps at 460 volts (5.6
amps at 208/230 volts). If the unit is not equipped with SpeedTrol, the standard fan motor will be 1
1/2 hp, 3-phase (for ALS070A-280A) with a FLA as shown in the electrical tables. For ALS300A425A the standard fan motor will be 2 hp, 3-phase.
4. Compressor LRA for reduced inrush start is for the first winding. If the unit is equipped with
SpeedTrol motors, the first motor on each refrigerant circuit is a single phase, 1 hp motor, with a
LRA of 7.3 amps at 460 volts (14.5 amps at 208/230 volts). If the unit is not equipped with
SpeedTrol, the standard fan motor will be 1« hp, 3-phase with a LRA as shown in the electrical
tables.
5. Single point power supply requires a single disconnect to supply electrical power to the unit. This
power must be fused.
6. Multiple point power supply requires two independent power circuits on ALS125A-ALS195A,
ALS300-ALS425 and three independent power circuits on ALS205A-ALS280A each with separate
fused disconnects and a separate control circuit.
7. All field wiring to unit power block or optional non-fused disconnect switch must be copper.
8. Field wire size values given in tables apply to 75°C rated wire per NEC except for ALS185AALS204A and ALS370A, ALS425A for 208V application or as noted.
9. Disconnect switches must be field supplied.
10. All wiring must be done in accordance with applicable local and national codes.
11. Recommended time delay fuse size or circuit breakers (Canadian units only) is equal to 150% of the
largest compressor-motor RLA plus 100% of remaining compressor RLAs and the sum of
condenser fan FLAs.
12. Maximum time delay fuse size or circuit breakers (Canadian units only) is equal to 225% of the
largest compressor-motor RLA plus 100% of remaining compressor RLAs and the sum of
condenser fan FLAs.
IOMM ALS
47
Electrical Legend
Table 46
48
IOMM ALS
Typical Field Wiring Diagram
Figure 23, Field Wiring, ALS 070A-425A
IOMM ALS
49
Unit Layout and Principles of Operation
Major Component Location
Figure 24, ALS 125-204
Figure 25, ALS 205-280
50
IOMM ALS
Figure 26, ALS 300-425
Control Center
All electrical controls are enclosed in a weather resistant control center with keylocked, hinged access
doors. The control center is composed of two separate compartments, high voltage and low voltage.
All of the high voltage components are located in the compartment on the right side of the unit.
The low voltage components are located on the left side with the 115 VAC terminals located behind
the deadfront panel. This protects service personnel from 115 VAC terminals when accessing the
adjustable and resettable controls.
Figure 27, Control Center Layout, ALS 125A-204
IOMM ALS
51
Figure 28, Control Center Layout, ALS 205A-280A
Figure 29, Control Center Layout, ALS 300A-425A
52
IOMM ALS
Sequence of Operation
The following sequence of operation is typical for McQuay models ALS chillers. The sequence may
vary depending on the software revision or various options which may be installed on the chiller.
Off conditions
With power supplied to the unit, 115 VAC power is applied through the control fuse F1 to the
compressor heaters (HTR1, HTR2, HTR3, HTR4 and evaporator heater) and the primary of the 24V
control circuit transformer. Note: Compressor heaters must be on for at least 12 hours prior to startup. The 24V transformer provides power to the MicroTech controller and related components. With
24V power applied, the controller will check the position of the front panel system switch. If the
switch is in the "stop" position the chiller will remain off and the display will indicate the operating
mode to be OFF: System Sw. The controller will then check the pumpdown switches. If any of the
switches is in the "stop" position, that circuit’s operating mode will be displayed as OFF:
PumpDwnSw. If the switches for both circuits are in the "Stop" position the unit status will display
OFF: PumpdownSw’s. If the remote start/stop switch is open the chiller will be OFF: RemoteSw. The
chiller may also be commanded off via communications from a separate communicating panel such as
the Remote Monitoring and Sequencing Panel or an Open Protocol interface. The display will show
OFF: RemoteComm if this operating mode is in effect. If an alarm condition exists which prevents
normal operation of both refrigerant circuits, the chiller will be disabled and the display will indicate
OFF: Alarm. If the control mode on the keypad is set to "Manual Unit Off," the chiller will be
disabled and the unit status will display OFF: ManualMode. Assuming none of the above stop
conditions are true, the controller will examine the internal time schedule to determine whether the
chiller should be permitted to start. The operating mode will be OFF: TimeClock if the time schedule
indicates time remaining in an "off" time period.
Alarm
The alarm light on the front panel will be illuminated when one or more of the cooling circuits has an
active alarm condition which results in the circuit being locked out. Unless the alarm condition affects
all circuits the remaining circuits will operate as required. Refer to IM 549 for details.
Start-up
If none of the above "off" conditions are true, the MicroTech controller will initiate a start sequence
and energize the chiller water pump output relay. The chiller will remain in the WaitForFlow mode until
the field installed flow switch indicates the presence of chilled water flow. If flow is not proven within
30 seconds, the alarm output will be turned on, the keypad display will be WaitForFlow and the chiller
will continue to wait for proof of chilled water flow. Once flow is established, the controller will sample
the chilled water temperature and compare it against the Leaving Chilled Water Set Point, the Control
Band, and the Start-up Delta Temperature, which have been programmed into the controller’s memory.
If the leaving chilled water temperature is above the Leaving Chilled Water Set Point plus ½ the Control
Band plus the adjustable Start-up Delta Temperature, the controller will select the refrigerant circuit
with the lowest number of starts as the lead circuit and energize the first stage of the Cool Staging
mode. The controller will start the compressor and energize the compressor liquid injection solenoid
along with the main liquid line solenoid. The controller will delay the opening of the electronic
expansion valve until the evaporator pressure decreases to a preset value. This is the evaporator
prepurge mode and the display will show Pre-Purge. The valve will then open allowing refrigerant to
flow through the expansion valve and into the evaporator and the display will show Opened EXV. If
additional cooling capacity is required, the controller will energize the additional cooling capacity by
activating the first compressor’s capacity control solenoids. As the system load increases, the
controller will start the lag refrigerant circuit in the same manner after interstage timers are satisfied.
The compressors and capacity control solenoids will automatically be controlled as required to meet
the cooling needs of the system. The electronic expansion valves are operated by the MicroTech
controller to maintain precise refrigerant control to the evaporator at all conditions.
IOMM ALS
53
Condenser Control
The first condenser fan stage will be started along with the first compressor to provide initial
condenser head pressure control The MicroTech controller will activate the remaining condenser fans
as needed to maintain proper condenser pressure. The MicroTech controller continuously monitors
the condenser minus evaporator lift pressure and will adjust the number of operating condenser fans
as required. The number of condenser fans operating will vary with outdoor temperature and system
load. The condenser fans are matched to the operating compressors so that when a compressor is off
all fans for that circuit will also be off. On units with the fan speed control option (SpeedTrol) the lead
fan on each circuit will vary in speed to maintain condenser pressure at lower outdoor temperatures.
Pumpdown
As the system chilled water requirements diminish. The compressors will be unloaded. As the system
load continues to drop, the electronic expansion valves will be stepped closed and the refrigerant
circuits will go through a pumpdown sequence. As the evaporator pressure falls below the
pumpdown pressure set point while pumping down, the compressor(s) and condenser fans will stop.
The unit has a one time pumpdown control logic; therefore, if the evaporator pressure rises while the
refrigerant circuit is in a pumpdown mode, the controller will not initiate another pumpdown sequence.
The controller will keep the unit off until a call for cooling occurs. Refer to the pumpdown control
section in IM549 for additional details. The chilled water pump output relay will remain energized until
the time schedule’s "on" time expires, the remote stop switch is opened, the system switch is moved
to the stop position, or a separate communications panel such as the Remote Monitoring and
Sequencing Panel or an Open Protocol interface deactivates the chilled water pump output.
Warning
The screw compressor must not be used as a pump out compressor for service work involving
removal of refrigerant from the compressor or evaporator. That is, the compressor must not be run
with the liquid line valve (king valve) closed. Portable recovery equipment must be used to remove
the refrigerant.
Figure 30, ALS Piping Schematic
54
IOMM ALS
Start-up and Shutdown
WARNING
Initial start-up must be performed by McQuayService personnel.
CAUTION
Most relays and terminals in the unit control center are powered when S1 is closed and the control
circuit disconnect is on. Therefore do not close S1 until ready for start-up.
Seasonal Start-up
1. Double check that the compressor suction and discharge shutoff valves are backseated. Always
replace valve seal caps.
2. Insure that the ball valves are open on the lines entering the evaporator.
3. Insure that the manual liquid line shutoff valve at the outlet of the subcooler is open.
4. Adjust the leaving chilled water temperature set point on the MicroTech controller to the desired
chilled water temperature. The control band is preset for 10 degrees Delta-T between the entering
and leaving evaporator water temperature at full load. If the Delta-T is outside an 8°-12°F range, at
full load, reset the control band as per the instructions found in the MicroTech IM Manual 549.
5. Start the auxiliary equipment for the installation by turning on the time clock, and/or remote on/off
switch, and chilled water pump.
6. Check to see that pumpdown switches PS1, PS2, PS3 and PS4 are in the "Pumpdown and Stop"
(open) position. Throw the S1 switch to the "auto" position.
7. Under the "Control Mode" menu of the keypad place the unit into the automatic cool mode.
8. Start the system by moving pumpdown switch PS1 to the "auto" position.
9. After running circuit #1 for a short time, check for flashing in the refrigerant sightglass under stable
conditions.
10. Repeat steps 8 and 9 for PS2, PS3 and PS4 and the second, third and fourth refrigerant circuits.
11. Superheat is factory adjusted to maintain between 6° and 12°F.
CAUTION
The superheat should be between 6°F and 12°F, with the liquid line sightglass full, once the system
temperatures have stabilized at the MicroTech set point temperatures.
Temporary Shutdown
Move pumpdown switches PS1, PS2, PS3 and PS4 to the "Pumpdown and Stop" position. After the
compressors have pumped down, turn off the chilled water pump. Caution: Do not turn the unit off
using the "S1" switch, without first moving PS1, PS2, PS3 and PS4 to the "Stop" position, unless it is
an emergency as this will prevent the unit from going through a pumpdown.
IOMM ALS
55
IMPORTANT
The unit has one time pumpdown operation. When PS1, PS2, PS3 and PS4 are in the "Pumpdown and
Stop" position the unit will pumpdown once and not run again until the PS1, PS2, PS3 and PS4
switches are moved to the auto position. If PS1, PS2, PS3 and PS4 are in the auto position and the
load has been satisfied the unit will go into one time pumpdown and will remain off until MicroTech
senses a call for cooling and starts the unit. Under no circumstance use the compressors for
pumpdown with the liquid line valves closed.
CAUTION
The unit must not be cycled off by using the evaporator pump or the disconnect switch.
It is important that the water flow to the unit is not interrupted before the compressors pumpdown to
avoid freeze-up in the evaporator.
If all power is turned off to the unit the compressor heaters will become inoperable. Once power is
resumed to the unit it is important that the compressor heaters are energized a minimum of 12 hours
before attempting to start the unit. Failure to do so could damage the compressors due to excessive
accumulation of liquid in the compressor.
Start-up After Temporary Shutdown
1. Insure that the compressor heaters have been energized for at least 12 hours prior to starting the
unit.
2. Start the chilled water pump.
3. With System switch S1 in the "on" position, move pumpdown switches PS1, PS2, PS3 and PS4 to
the "auto" position.
4. Observe the unit operation until the system has stabilized.
WARNING
If shutdown occurs or will continue through periods below freezing ambient temperatures, protect the
chiller vessel from freezing.
Extended Shutdown
1. Move the PS1, PS2, PS3 and PS4 switches to the manual pumpdown position.
2. After the compressors have pumped down, turn off the chilled water pump.
3. Turn off all power to the unit and to the chilled water pump.
4. Move the emergency stop switch S1 to the "off" position.
5. Close the compressor suction and discharge valves as well as the liquid line shutoff valves.
6. Tag all opened disconnect switches to warn against start-up before opening the compressor suction
and discharge valves and liquid line shutoff valves.
7. If glycol is not used in the system drain all water from the unit evaporator and chilled water piping if
the unit is to be shutdown during winter. Do not leave the vessels or piping open to the
atmosphere over the shutdown period.
8. Leave power applied to the evaporator heating cable if a separate disconnect is used.
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IOMM ALS
Start-up After Extended Shutdown
1. With all electrical disconnects open, check all screw or lug type electrical connections to be sure
they are tight for good electrical contact.
2. Check the voltage of the unit power supply and see that it is within the ±10% tolerance that is
allowed. Voltage unbalance between phases must be within ±3%.
3. See that all auxiliary control equipment is operative and that an adequate cooling load is available
for start-up.
4. Check all compressor valve connections for tightness to avoid refrigerant loss. Always replace
valve seal caps.
5. Make sure system switch S1 is in the "Stop" position and pumpdown switches PS1, (PS2, PS3 and
PS4) are set to "Pumpdown and Stop," throw the main power and control disconnect switches to
"on." This will energize crankcase heaters. Wait a minimum of 12 hours before starting up unit.
Turn compressor circuit breakers to "off" position until ready to start unit.
6. Vent the air from the evaporator water side as well as from the system piping. Open all water flow
valves and start the chilled water pump. Check all piping for leaks
IOMM ALS
57
System Maintenance
General
On initial start-up and periodically during operation, it will be necessary to perform certain routine
service checks. Among these are checking the liquid line sightglasses and taking condensing and
section pressure readings. Through the MicroTech keypad, check to see that the unit has normal
superheat and subcooling readings. A recommended maintenance schedule is located at the end of
this section
A Periodic Maintenance Log is located at the end of this manual. It is suggested that the report be
completed on a weekly basis. The log will serve as a useful tool for a service technician in the event
service is required.
Compressor Maintenance
Since the compressor is semi-hermetic requiring no oil separator, oil heaters and pumps, no yearly
maintenance is normally required. However, vibration is an excellent check for proper mechanical
operation. Compressor vibration is an indicator of the requirement for maintenance and contributes to
a decrease in unit performance and efficiency. It is recommended that the compressor be checked with
a vibration analyzer at or shortly after start-up and again on an annual basis. When performing the
test the load should be maintained as closely as possible to the load of the original test. The initial
vibration analyzer test provides a benchmark of the compressor and when performed routinely can
give a warning of impending problems.
The compressor is supplied with a lifetime oil filter under normal operating conditions. However, it is a
good policy to replace this filter anytime the compressor is opened for servicing.
Lubrication
No routine lubrication is required on ALS units. The fan motor bearings are permanently lubricated.
No further lubrication is required. Excessive fan motor bearing noise is an indication of a potential
bearing failure.
Compressor oil must be Planetelf ACD68AW. McQuay Part Number 735030439 in a 5 gallon
container, 735030438 in 1 gallon size. This is a synthetic polyolester oil with anti-wear additives and is
highly hygroscopic. Care must be taken to minimize exposure of the oil to air when charging oil into
the system.
Electrical Terminals
WARNING
Electric shock hazard. Turn off all power before continuing with following service.
Condensers
The condensers are air-cooled and constructed of 3/8" (9.5mm) O.D. internally finned copper tubes
bonded in a staggered pattern into louvered aluminum fins. No maintenance is ordinarily required
except the routine removal of dirt and debris from the outside surface of the fins. McQuay
recommends the use of foaming coil cleaners available at most air conditioning supply outlets. Use
caution when applying such cleaners as they may contain potentially harmful chemicals. Care should
be taken not to damage the fins during cleaning.
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IOMM ALS
If the service technician has reason to believe that the refrigerant circuit contains noncondensables,
purging may be required strictly following Clean Air Act regulations governing refrigerant discharge
to the atmosphere. The purge Shrader valve is located on the vertical coil header on both sides of the
unit at the control box end of the coil. Access panels are located at the end of the condenser coil
directly behind the control panel. Purge with the unit off, after shutdown of 15 minutes or longer, to
allow air to collect at the top of the coil. Restart and run the unit for a brief period. If necessary, shut
unit off and repeat the procedure. Follow accepted environmentally sound practices when removing
refrigerant from the unit.
Refrigerant Sightglass
The refrigerant sightglasses should be observed periodically. (A weekly observation should be
adequate.) A clear glass of liquid indicates that there is adequate refrigerant charge in the system to
insure proper feed through the expansion valve. Bubbling refrigerant in the sightglass, during stable
run conditions, indicates that the system may be short of refrigerant charge. Refrigerant gas flashing
in the sightglass could also indicate an excessive pressure drop in the liquid line, possibly due to a
clogged filter-drier or a restriction elsewhere in the liquid line (see Table 53 for maximum allowable
pressure drops). If subcooling is low add charge to clear the sightglass. If subcooling is normal (10°15°F) and flashing is visible in the sightglass check the pressure drop across the filter-drier.
Subcooling should be checked at full load with 70°F (21.1°C) outdoor air temperature and all fans
running.
An element inside the sightglass indicates the moisture condition corresponding to a given element
color. If the sightglass does not indicate a dry condition after about 12 hours of operation, the circuit
should be pumped down and the filter-drier changed.
Lead-Lag
A feature on all McQuay ALS air cooled chillers is a system for alternating the sequence in which the
compressors start to balance the number of starts and run hours. Lead-Lag of the refrigerant circuits
is accomplished automatically through the MicroTech Controller. When in the auto mode the circuit
with the fewest number of starts will be started first. If all circuits are operating and a stage down in
the number of operating compressors is required, the circuit with the most operating hours will cycle
off first. The operator may override the MicroTech controller, and manually select the lead circuit as
circuit #1, #2, #3 or circuit #4.
IOMM ALS
59
Preventative Maintenance Schedule
PREVENTATIVE MAINTENANCE SCHEDULE
OPERATION
WEEKLY
General
Complete unit log and review (Note 3)
Visually inspect unit for loose or damaged components
Inspect thermal insulation for integrity
Clean and paint as required
MONTHLY
(Note 1)
X
X
X
X
Electrical
Check terminals for tightness, tighten as necessary
Clean control panel interior
Visually inspect components for signs of overheating
Verify compressor heater operation
Megger compressor motor every five years
Refrigeration
Leak test
Check sight glasses for clear flow
Check filter-drier pressure drop (see manual for spec)
Perform compressor vibration test
ANNUAL
(Note 2)
X
X
X
X
X
X
X
X
Condenser (air-cooled)
Clean condenser coils (Note 4)
Check fan blades for tightness on shaft (Note 5)
Check fans for loose rivets and cracks
Check coil fins for damage
Notes:
X
X
X
X
1. Monthly operations include all weekly operations.
2. Annual (or spring start-up) operations includes all weekly and monthly operations.
3. Log readings may be taken daily for a higher level of unit observation.
4. Coil cleaning may be required more frequently in areas with a high level of airborne particles.
5. Be sure fan motors are electrically locked out.
6. Poor water conditions may require more frequent inspections and cleaning.
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IOMM ALS
Service
CAUTION
1.
Service on this equipment is to be performed by qualified refrigeration personnel familiar with
equipment operation, maintenance, correct servicing procedures, and the safety hazards inherent
in this work. Causes for repeated tripping of safety controls must be investigated and corrected.
2.
Disconnect all power before doing any service inside the unit.
3.
Anyone servicing this equipment shall comply with the requirements set forth by the EPA in
regards to refrigerant reclamation and venting.
Compressor Solenoids
The ALS unit screw compressors are equipped with 3 solenoids to control compressor unloading.
The solenoids are controlled by MicroTech outputs. See unit wiring diagrams. The solenoids are
energized at various compressor load conditions as indicated in the table below.
Table 47, Compressor Unloading
COMPRESSOR
COMPRESSOR UN LOADING SOLENOID STATUS
LOADING %
TOP
SOLENOID
BOTTOM FRONT
SOLENOID
BOTTOM REAR
SOLENOID
100%
75%
50%
25%
Energized
Energized
Off
Off
Off
Energized
Off
Energized
Energized
Off
Energized
Off
Location of the solenoids is as follows:
The top solenoid is on top of the compressor near the discharge end.
The bottom solenoids are on the lower side of the compressor on the opposite side from the terminal
box. The bottom front solenoid is the one closest to the discharge end of the compressor. The
bottom rear solenoid is the one closest to the motor end of the compressor.
If the compressor is not loading properly check the solenoids to see if they are energized per the
above chart. A complete check will include a check of the MicroTech output, the wiring to the
solenoid and the solenoid coil itself.
Filter-Driers
A replacement of the filter-drier is recommended any time excessive pressure drop is read across the
filter-drier and/or when bubbles occur in the sightglass with normal subcooling. A partially clogged
filter can also cause trips on the no liquid run sensor. The maximum recommended pressure drops
across the filter-drier are as follows:
Table 48, Filter-Drier Pressure Drop
PERCENT CIRCUIT
LOADING (%)
MAXIMUM RECOMMENDED PRESSURE
DROP ACROSS FILTER DRIER PSIG (KPA)
100%
75%
50%
25%
10 (69)
8 (55.2)
5 (34.5)
4 (27.6)
The filter-drier should also be changed if the moisture indicating liquid line sightglass indicates excess
moisture in the system.
IOMM ALS
61
During the first few months of operation the filter-drier replacement may be necessary if the pressure
drop across the filter-drier exceeds the values listed in the paragraph above. Any residual particles
from the condenser tubing, compressor and miscellaneous components are swept by the refrigerant
into the liquid line and are caught by the filter-drier.
The following is the procedure for changing the filter-drier core:
This procedure is slightly different from a typical reciprocating compressor unit due to the use of a
liquid injection feature on the ASL screw compressor unit. Anytime the compressor contactor is
closed, liquid from the liquid line is injected into the screw for cooling and sealing the rotor. This
liquid injection also occurs during normal pumpdown and limits how low a pumpdown pressure can be
achieved.
The standard unit pumpdown is set to stop pumpdown when 34 psig (235 kPa) suction pressure is
reached. To fully pump down a circuit beyond 34 psig (235kPa) for service purposes a "Full
Pumpdown" service mode can be activated using the keypad. Go to the "Alarm Spts" Menu on the
MicroTech keypad, step through the menu items until "FullPumpDwn" is displayed. Change the
setting from "No" to "Yes".
The next time either circuit is pumped down, the pumpdown will continue until the evaporator
pressure reaches 2 psig (14 kPa) or 60 seconds have elapsed, whichever occurs first. Upon
completing the pumpdown, the "FullPumpDwn" set point is automatically changed back to "No".
The procedure to perform a full service pumpdown for changing the filter-drier core is as follows:
1. Perform a normal pumpdown to 34 psig (235 kPa) by moving the pumpdown switch to the
"Pumpdown" position. This step will pump down the evaporator with compressor liquid injection
still active.
2. Under the "Alarm Spts", change the "FullPumpDwn" set point from "No" to "Yes".
3. The circuit status should be "Off:PumpDwnSw". Move the circuit pumpdown switch from
"Pumpdown and Stop" to "Auto". Also clear the anticycle timers through the MicroTech keypad.
4. The compressor should pump down the circuit until the evaporator pressure reaches 2 psig (14 kPa)
or 60 seconds has elapsed, whichever occurs first.
5. Upon completing the full pumpdown per step 5, the "FullPumpDwn" set point is automatically
changed back to "No" which reverts back to standard 34 psig (235 kPa) stop pumpdown pressure.
6. If the pumpdown does not go to 2 psig (14 kPa) on the first attempt, one more attempt can be made
by repeating steps 3, 4 and 5 above. Do not repeat "FullPumpDwn" more than once to avoid
excessive screw temperature rise under this abnormal condition. A no liquid start alarm and
shutdown may occur during this procedure. Proceed as noted in step number 8.
7. The circuit is now in the deepest pumpdown which can safely be achieved by the use of the
compressor. Close the liquid line shutoff valve above the filter-drier, on the circuit to be serviced.
Any remaining refrigerant must be removed from the circuit by the use of a refrigerant recovery unit.
Remove and replace the filter-drier(s). If the refrigerant circuit is opened for more than 10 minutes
evacuate the lines through the liquid line manual shutoff valve(s) to remove noncondensables that
may have entered during filter replacement. A leak check is recommended before returning the unit to
operation.
Liquid Line Solenoid Valve
The liquid line solenoid valves that shut off refrigerant flow in the event of a power failure does not
normally require any maintenance. (On a sudden power failure the electronic expansion valve
remains open at the position it was at when the power failure occurred. During normal operation
the EEV closes for automatic pumpdown and the liquid line solenoid valve closes only when the
compressor stops.) The solenoids may, however, require replacement of the solenoid coil or of the
entire valve assembly.
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IOMM ALS
The solenoid coil can be checked to see that the stem is magnetized when energized by touching a
screwdriver to the top of the stem. If there is no magnetization either the coil is bad or there is no
power to the coil.
The solenoid coil may be removed from the valve body without opening the refrigerant piping after
first moving pumpdown switches PS1, PS2, and PS3 to the "manual pumpdown" position and opening
the S1 switch. For personal safety shut off and lock out the unit power.
The coil can then be removed from the valve body by simply removing a nut or snap-ring located at
the top of the coil. The coil can then be slipped off its mounting stud for replacement. Be sure to
replace the coil on its mounting stud before returning pumpdown switches PS1, PS2 and PS3 to the
"auto pumpdown" position. Failure to do so will lead to solenoid coil failure
To replace the entire solenoid valve follow the steps involved when changing a filter-drier.
Liquid Injection Solenoid Valve
Liquid injection is required during compressor operation to seal and cool the rotor. A liquid injection
sensor is installed on the compressor to assure that liquid injection occurs whenever the compressor
is running. A failure of the liquid injection solenoid valve to open will cause the compressor to shut
down due to lack of liquid injection.
The liquid injection solenoid valve, like the liquid line solenoid valve, only closes when the
compressor stops. Since this valve is open during pumpdown the refrigerant in the line will cause the
suction pressure to rise 10 to 20 psig (69 to 138 kPa) after shutdown occurs. The solenoid coil and
valve body can be removed as in the same procedure as the liquid line solenoid valve but it is
important that the S1 switch be opened first.
Electronic Expansion Valve
The electronic expansion valve is located adjacent to the compressor. The refrigerant is piped to first
passes through the electronic expansion valve, then through the motor housing cooling the motor
before going into the evaporator. Refer to the Figure 30, ALS Piping Schematic.
The expansion valve meters the amount of refrigerant entering the evaporator to match the cooling
load. It does this by maintaining a constant superheat. (Superheat is the difference between the
actual refrigerant temperature of the vapor as it leaves the evaporator and the saturation temperature
corresponding to the evaporator pressure.) All ALS chillers are factory set between 8°F (4.5°C) and
12°F (6.6°C) superheat at 75% to 100% load and between 6°F (3.3°C) and 10°F (5.6°C) below 75% load.
The superheat is controlled by the microprocessor and is not adjustable.
The expansion valve, like the solenoid valve, should not normally require maintenance, but if it
requires replacement, the unit must be pumped down by following the steps involved when changing
a filter-drier.
If the problem can be traced to the electric motor only, it can be unscrewed from the valve body
without removing the valve but only after pumping the unit down. Disassemble valve at the brass hex
nut. Do not disassemble valve at the aluminum housing.
IOMM ALS
63
Figure 31,. Electronic expansion valve
Electronic Expansion Valve Operation
There are three colored indicator LEDs (green, red, yellow) located in the control panel on the
electronic expansion valve (EXV) board. When the control panel is first powered the microprocessor
will automatically step the valve to the fully closed (shut) position and the indicator lights on the EXV
will blink in sequence. The valve can also be heard closing as it goes through the steps. The valve
will take approximately 14 seconds to go from a full open position to a full closed position.
The position of the valve can be viewed at any time by using the MicroTech keypad through the
circuit pressure menus. There are a total of 760 steps between closed and full open.
A feature of the electronic expansion valve is a maximum operating pressure setting (MOP). This
setting limits the load on the compressor during start-up periods where high return evaporator water
temperatures may be present. The valve will limit the maximum suction pressure at start-up to
approximately 85 psig (586 kPa). The valve will close to a point necessary to maintain the 85 psig (586
kPa). During this time the superheat will rise above 12°F (6.6°C) and not drop below 12°F (6.6°C) until
the suction pressure drops below 85 psig (586 kPa). The valve will maintain evaporator pressure close
to 85 psig (586 kPa) until the evaporator water temperature decreases to approximately 55°F to 60°F
(12.7°C to 15.6°C).
When the circuit starts the valve opens as soon as the evaporator pressure decreases to 40 psig (275
kPa). At the end of the cooling cycle the valve closes causing the system to pump down. The valve
closes at the rate of approximately 55 steps per second, or from full open to full closed in
approximately 14 seconds. The valve closing during pumpdown will occur in approximately 20-30
seconds after the pumpdown switch is moved to the "Pumpdown and Stop" position.
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IOMM ALS
Evaporator
The evaporator is the direct expansion, shell-and-tube type with refrigerant flowing through the tubes
and water flowing through the shell over the tubes. The tubes are internally finned to provide
extended surface as well as turbulent flow of refrigeration through the tubes. Normally no service
work is required on the evaporator.
Refrigerant Charging
ALS air-cooled screw chillers are shipped factory charged with a full operating charge of refrigerant
but there may be times that a unit must be recharged at the job site. Follow these recommendations
when field charging. Refer to the unit operating charge found in the Physical Data Tables, Table 13
through Table 19
ALS air-cooled screw chillers are more sensitive to undercharging than to overcharging, therefore it is
preferable to be slightly overcharged rather than undercharged. The optimum charge is the charge
which allows the unit to run with a solid stream of liquid in the liquid line at all operating conditions.
When the liquid line temperature does not drop with the addition of 5 to 10 lbs of refrigerant, the
correct maximum charge has been reached. If the liquid line temperature does not drop and the
discharge pressure goes up 3-5 psig (20.7-34.5 kPa) as 5-10 lbs of refrigerant is added the correct
maximum charge has been reached.
Unit charging can be done at any steady load condition (preferably at 75 to 100% load) and at any
outdoor temperature (preferably higher than 70°F (21.1°C). Unit must be allowed to run 5 minutes or
longer so that the condenser fan staging is stabilized at normal operating discharge pressure. For best
results charge with two or more condenser fans operating on each refrigerant circuit.
The ALS units have a condenser coil design with approximately 15% of the coil tubes located in a
subcooler section of the coil to achieve liquid cooling to within 5°F (3°C) of the outdoor air
temperature when all condenser fans are operating. This is equal to about 15°F-20°F (8.3°C-11.1°C)
subcooling below the saturated condensing temperature when the pressure is read at the liquid valve
between the condenser coil and the liquid line filter drier. Once the subcooler is filled, extra charge will
not lower the liquid temperature and does not help system capacity or efficiency. However, a little
extra (10-15 lbs) will make the system less sensitive.
Note: As the unit changes load or fans cycle on and off, the subcooling will vary but should recover
within several minutes and should never be below 6°F (3.3°C) subcooling at any steady state
condition. Subcooling will vary somewhat with evaporator leaving water temperature and suction
superheat. As the evaporator superheat decreases the subcooling will drop slightly.
Excessive refrigerant losses can also leak oil from the system. When adding more than 25 lbs of
charge or if there is visible evidence of a significant oil leakage, add an additional oil equivalent to 0.04
pints for each pound of refrigerant required. (Example: For every 10 lbs. of refrigerant charge add .4
pints of oil.). The oil charge is 10% of the refrigerant charge by weight. The only acceptable oil is
Planetelf ACD68AW
One of the following three scenarios will be experienced with an undercharged unit:
1. If the unit is slightly undercharged the unit will show bubbles in the sightglass. Recharge the unit
as described in the charging procedure below.
2. If the unit is moderately undercharged it will normally trip on freeze protection. Recharge the unit as
described in the charging procedure below.
IOMM ALS
65
3. If the unit is severely undercharged the unit will trip due to lack of liquid injection. In this case
either remove the remaining charge by means of a proper reclamation system and recharge the unit
with the proper amount of refrigerant as stamped on the unit nameplate, or add refrigerant through
the suction valve on the compressor. Feed liquid into the suction valve when the compressor is
running. If the unit is severely undercharged the unit may nuisance trip during this charging
procedure. If this happens close off the refrigerant from the tank and restart the unit. Once the unit
has enough charge so that it does not trip out, continue with step 2 of the charging procedure
below.
Procedure to charge a moderately undercharged ALS unit:
1. If a unit is low on refrigerant you must first determine the cause before attempting to recharge the
unit. Locate and repair any refrigerant leak. Evidence of oil is a good indicator of leakage, however
oil may not be visible at all leaks. Liquid leak detector fluids work well to show bubbles at medium
size leaks but electronic leak detectors may be needed to locate small leaks.
2. Add the charge to the system through the suction shutoff valve or through the Schrader fitting on
the tube entering the evaporator between the compressor and the evaporator head.
3. The charge can be added at any load condition between 25-100% load per circuit but at least twoF
fans should be operating per refrigerant circuit if possible. The suction superheat should be in the
6°F-12°F (3.3°C-6.6°C) range.
4. Add sufficient charge to clear the liquid line sightglass and until all flashing stops in the sightglass.
Add an extra 15-20 lbs. of reserve to fill the subcooler if the compressor is operating at 50-100%
load.
5. Check the unit subcooling value on the MicroTech display or by reading the liquid line pressure
and temperature at the liquid line near the filter-drier. The subcooling values should be between
6°F-20°F (6.6°C-11.1°C). The subcooling values will be highest at 75-100% load, approximately 12°F20°F (6.6°C-11.1°C) and lowest at 50% load, approximately 6°F-12°F (3.3°C-6.6°C).
6. With outdoor temperatures above 60°F (15.6°C) all condenser fans should be operating and the
liquid line temperature should be within 5°F-10°F (2.8°C-5.6°C) of the outdoor air temperature. At
25-50% load the liquid line temperature should be within 5°F (2.8°C) of outdoor air temperature with
all fans on. At 75-100% load the liquid line temperature should be within 10°F (5.6°C) of outdoor air
temperature with all fans on.
7. Overcharging of refrigerant will raise the compressor discharge pressure due to filling of the
condenser tubes with excess refrigerant.
66
IOMM ALS
In-Warranty Return Material Procedure
In the U.S. and Canada
Compressor: The McQuay International warranty provides for repair or replacement, at the
Company’s option, of components supplied by it that may fail within the warranty period. Screw
type compressors fall into this category.
In the event of a failure contact, the nearest McQuayService office for assistance. During the first
year’s installation period, warranty labor and parts will be furnished by McQuayService at no
charge if the failure is determined to be a defect in material or workmanship.
ALS units purchased with a four year extended compressor warranty may or may not include extended
period warranty labor depending upon the initial purchase agreement. In either event
McQuayService should be contacted to handle the repair or replacement of the compressor.
Components Other Than Compressors: Material may not be returned except by permission of
authorized factory service personnel of McQuay International at Staunton, Virginia. A "return
goods" tag will be sent to be included with the returned material. Enter the information as called for
on the tag in order to expedite handling at our factories and to prompt issuance of credits.
The return of the part does not constitute an order for replacement. Therefore, a purchase order must
be entered through your nearest McQuay representative. The order should include part name, part
number, model number and serial number of the unit involved.
Following our personal inspection of the returned part, and if it is determined that the failure is due to
faulty material or workmanship, and in warranty, credit will be issued on customer’s purchase order.
All parts shall be returned to the pre-designated McQuay factory, transportation charges prepaid.
IOMM ALS
67
Standard Controls
Thermistor sensors
Note: Refer to IM 549 for a more complete description of the controls application, settings,
adjustments, and checkout procedures.
All sensors are premounted and connected to the MicroTech field wiring strip with shielded cable. A
description of each sensor is listed here.
Evaporator leaving water temperature - This sensor is located on the evaporator water outlet
connection and is used for capacity control of the chiller and low water temperature freeze protection.
Evaporator entering water temperature - This sensor is located on the evaporator water inlet
connection and is used for monitoring purposes and return water temperature control.
Evaporator pressure transducer circuit #1 - This sensor is located on the suction side of compressor
#1 and is used to determine saturated suction refrigerant pressure and temperature. It also provides
low pressure freeze protection for circuit #1.
Evaporator pressure transducer circuit #2 - This sensor is located on the section side of compressor
#2 and is used to determine saturated suction refrigerant pressure and temperature. It also provides
low pressure freeze protection for circuit #2.
Evaporator pressure transducer circuit #3 - This sensor is located on the suction side of compressor
#3 and is used to determine saturated suction refrigerant pressure and temperature. It also provides
low pressure freeze protection for circuit #3.
Evaporator pressure transducer circuit #4 - This sensor is located on the suction side of compressor
#4 and is used to determine saturated suction refrigerant pressure and temperature. It also provides
low pressure freeze protection for circuit #4.
Condenser pressure transducer circuit #1 - the sensor is located on the discharge of compressor #1
and is used to read saturated refrigerant pressure and temperature. The transducer will unload the
compressor should a rise in head pressure occur which is outside the MicroTech set point limits. The
signal is also used in the calculation of circuit #1 subcooling.
Condenser pressure transducer circuit #2 - The sensor is located on the discharge of compressor #2
and is used to read saturated refrigerant pressure and temperature. The transducer will unload the
compressor should a rise in head pressure occur which is outside the MicroTech set point limits. The
signal is also used in the calculation of circuit #2 subcooling.
Condenser pressure transducer circuit #3 - the sensor is located on the discharge of compressor #3
and is used to read saturated refrigerant pressure and temperature. The transducer will unload the
compressor should a rise in head pressure occur which is outside the MicroTech set point limits. The
signal is also used in the calculation of circuit #3 subcooling.
Condenser pressure transducer circuit #4 - The sensor is located on the discharge of compressor #4
and is used to read saturated refrigerant pressure and temperature. The transducer will unload the
compressor should a rise in head pressure occur which is outside the MicroTech set point limits. The
signal is also used in the calculation of circuit #4 subcooling.
Outside air - This sensor is located on the back of the control box on compressor #1 side. It measures
the outside air temperature, is used to determine if low ambient start logic is necessary and can be the
reference for low ambient temperature lockout.
Suction temperature circuit #1 - The sensor is located in a well brazed to circuit #1 suction line. The
purpose of the sensor is to measure refrigerant temperature to control and maintain proper superheat.
68
IOMM ALS
Figure 32, Sensor Locations, ALS 070-204
Table 49, Sensor Location, ALS 070 - 204
SENSOR
NUMBER
S00
S01
S02
S03
S04
S06
S07
S08
S09
S11
S12
DESCRIPTION
Evap. Leaving water temp.
Evap. Pressure transducer circ.
Evap. Pressure transducer circ.
Cond. Pressure transducer circ.
Cond. Pressure transducer circ.
Evap. Water temp reset
Demand limit
Evap. Entering water temp.
Outside air temp.
Total unit amps
Section temp. circ. #3
#1
#2
#1
#2
SENSOR
NUMBER
DESCRIPTION
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
Suction temp. circ. #2
Liquid line temp. circ. #1
Liquid line temp. circ. #2
Evap. Pressure transducer circ. #3
Cond. Pressure transducer circ. #3
Suction temp circ. #3
Liquid line temp. Circ. #3
Discharge temp. circ. #1
Discharge temp. circ. #2
Discharge temp. circ. #3
Figure 33, Sensor Locations, ALS 205-280
Table 50, Sensor Location, ALS 205 - 280
SENSOR
NUMBER
DESCRIPTION
SENSOR
NUMBER
DESCRIPTION
SENSOR
NUMBER
DESCRIPTION
S00
S01
S02
S03
S04
S06
S07
S08
Evap leaving water temp
Low pressure transducer circ. #1
Low pressure transducer circ. #2
High pressure transducer circ. #1
High pressure transducer circ. #2
Evap water temp reset (field supplied)
Demand limit (field supplied)
Evap entering water temp
S09
S10
S11
S12
S13
S14
S15
S16
Outside air temp
Percent circuit amps circ. #1
Percent circuit amps circ. #2
Suction temp circ. #1
Suction temp circ. #2
Liquid line temp circ. #1
Liquid line temp circ. #2
Low pressure transducer circ. #3
S17
S18
S19
S20
S21
S22
S23
High pressure transducer circ. #3
Suction temp circ. #3
Liquid line temp circ. #3
Discharge temp circ. #1
Discharge temp circ. #2
Discharge temp circ. #3
Percent circuit amps circ. #3
IOMM ALS
69
70
IOMM ALS
Figure 34, Sensor location, ALS 300-425
Table 51, Sensor Location, ALS 300 - 425
SENSOR
NUMBER
DESCRIPTION
SENSOR
NUMBER
DESCRIPTION
SENSOR
NUMBER
DESCRIPTION
S00
S01
S02
S03
Evap leaving water temp
Low pressure transducer circ. #1
Low pressure transducer circ. #2
High pressure transducer circ. #1
S09
S10
S11
S12
Outside air temp
Percent circuit amps circ. #1 & 3
Percent circuit amps circ. #2 & 4
Suction temp circ. #1
S17
S18
S19
S20
High pressure transducer circ. #3
Suction temp circ. #3
Liquid line temp circ. #3
Low pressure transducer circ. #4
S04
High pressure transducer circ. #2
S13
Suction temp circ. #2
S21
High pressure transducer circ. #4
S06
Evap water temp reset (field supplied)
S14
Liquid line temp circ. #1
S22
Suction temp circ. #4
S07
Demand limit (field supplied)
S15
Liquid line temp circ. #2
S23
Liquid line temp circ. #4
S08
Evap entering water temp
S16
Low pressure transducer circ. #3
Suction temperature circuit #2 - The sensor is located in a well brazed to circuit #2 suction line. The
purpose of the sensor is to measure refrigerant temperature to control and maintain proper superheat.
Suction temperature circuit #3 - The sensor is located in a well brazed to circuit #3 suction line. The
purpose of the sensor is to measure refrigerant temperature to control and maintain proper superheat.
Suction temperature circuit #4 - The sensor is located in a well brazed to circuit #4 suction line. The
purpose of the sensor is to measure refrigerant temperature to control and maintain proper superheat.
Liquid line temperature circuit #1 - The sensor is located in a well brazed to circuit #1 liquid line. It
measures the refrigerant temperature and is used to calculate subcooling.
Liquid line temperature circuit #2 - The sensor is located in a well brazed to circuit #2 liquid line. It
measures the refrigerant temperature and is used to calculate subcooling.
Liquid line temperature circuit #3 - The sensor is located in a well brazed to circuit #3 liquid line. It
measures the refrigerant temperature and is used to calculate subcooling.
Liquid line temperature circuit #4 - The sensor is located in a well brazed to circuit #4 liquid line. It
measures the refrigerant temperature and is used to calculate subcooling.
Demand limit - This requires a field connection of a 4-20 milliamp DC signal from a building
automation system. It will determine the maximum number of cooling stages which may be energized.
Evaporator water temperature reset - This requires a 4-20 milliamp DC signal from a building
automation system or temperature transmitter to reset the leaving chilled water set point.
Percent total unit amps - (optional) This is located in the power side of the control panel. An
adjustable voltage resistor and a signal converter board sends a DC signal proportional to the total
compressor motor current to the microprocessor.
IOMM ALS
71
Liquid presence sensor
Each compressor is equipped with a liquid sensor to assure that liquid flows to the compressor for
cooling and sealing during operation. The sensor will shutdown the compressor in the event no liquid
is sensed. At start-up the liquid sensor checks for excessive liquid in the compressor and will delay
start until the compressor heater transfers the liquid out of the compressor and into the condenser. A
trip by the this sensor will cause an alarm message on the MicroTech display.
High condenser pressure control
MicroTech is also supplied with high pressure transducers on each refrigerant circuit. Although the
main purpose of the high pressure transducer is to maintain proper head pressure control, another
purpose is to convey a signal to the MicroTech control to unload the compressor in the event of an
excessive rise in discharge pressure to within 20 psi (138 kPa) of the condenser pressure control
setpoint of 380 psig (2620 kPa). Also, a MicroTech control setting will not allow additional circuit
loading at approximately 30 psi (207 kPa) below the high pressure switch trip setting. The high
pressure alarm is in response to the signal sent by the pressure transducer. The high pressure
transducer can be checked by elevating discharge pressure (see Mechanical High Pressure Safety
Control) and observing the MicroTech display (or a pressure gage), and unit operation as the
pressures pass the rising high pressure values noted. After the test reset the High Condenser
Pressure alarm set point to 380 psig (2620 kPa).
Mechanical high pressure safety control
The high pressure safety control is a single pole pressure activated switch that opens on a pressure
rise. When the switch opens, the control circuit is de-energized dropping power to the compressor
and fan motor contactors. The switch is factory made to open at 400 psig (2760 kPa) (+10 psig) and
reclose at 300 psig (2070 kPa). Although the high pressure switch will close again at 300 psig (2070
kPa), the control circuit will remain locked out and it must be reset through MicroTech.
The control is mounted on the compressor attached to a fitting ahead of the discharge shut off valve.
Remove wire 133 from terminal 20 of the MicroTech controller. This will disable all but one fan.
Observe the cut out point of the control through the MicroTech keypad display, or by means of a
service gauge on the back seat port on the discharge service valve. Important: Closely monitor the
High Pressure Control and stay within reach of the emergency stop switch. Do not let the pressure
exceed 420 psig (2900 kPa) during the test. If the condenser pressure reaches 420 psig (2900 kPa)
open the emergency stop switch. The MicroTech keypad display may read slightly lower than a
service gauge. Upon completion of the test reset the High Pressure Control back to 380 psig (2620
kPa).
To check the control on circuit #2 repeat the same procedure after removing wire 233 from terminal 30.
Compressor motor protection
The compressors are supplied with two types of motor protection. Solid state electronic overloads
mounted in the control box sense motor current to within 2% of the operating amps. The MUST TRIP
amps are equal to 140% of unit nameplate compressor RLA. The MUST HOLD amps are equal to
125% of unit nameplate RLA. A trip of these overloads can result from the unit operating outside of
normal conditions. Repeat overload trips under normal operation may indicate wiring or compressor
motor problems. The overloads are manual reset and must be reset at the overload as well as through
MicroTech.
The compressors also have a solid state Guardister circuit which provides motor over temperature
protection. The Guardister circuit has automatic reset but must also be reset through MicroTech.
FanTrol head pressure control
FanTrol is a method of head pressure control which automatically cycles the condenser fans in
response to condenser pressure. This maintains head pressure and allows the unit to run at all
ambient air temperatures within the control design parameters.
All ALS units have independent circuits with the fans being controlled independently by the
condensing pressure of each circuit. If one circuit is off all fans on that circuit will also be off. The
72
IOMM ALS
use of multiple fans enables the unit to have excellent head pressure control at low outside ambient
temperatures by cycling the fans to maintain the compressor discharge pressure within the desired
operating band.
At outdoor temperatures above approximately 65°F (18.3°C) all of the fans for a circuit will be
operating to achieve the most efficient unit operation. At any compressor load condition of 50% or
above the unit has the highest overall efficiency with all fans operating. When the compressor
unloads below 50% the last fan stage is cut off because the fan energy saved is more than the
increase of compressor power at this light loading. Below approximately 65°F (18.3°C) outdoor
temperature the fans are cycled off as needed on each refrigerant circuit by the MicroTech control to
maintain the compressor discharge pressure in the optimum range for best unit operation and highest
overall efficiency.
Fans are controlled by MicroTech in response to the system discharge pressure. The use of
MicroTech to stage on the fans as needed allows more precise control and prevents undesirable
cycling of fans.
One fan always operates with the compressor and other fans are activated one at a time as needed.
The control uses 6 stages of fan control with four outputs to activate up to six additional fans per
circuit. MicroTech logic sequences fan contactors to stage one fan at a time. On units with six or
seven fans per circuit, a single fan is cut off when two fans are started to achieve adding one
operating fan. See Table 52.
Table 52, Fan Staging
MicroTech fan stage
Fan output relay on
Total fans operating
ALS070A THRU ALS 080A (FANS PER CKT=3)
0
1
2
3
1
2
1,2
1
2
3
4
4
1,2,3
6
ALS090A THRU ALS 100A (FANS PER CKT=4)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
2
3
3
1,2
4
4
1,2,3
6
5
1,2,3,4
8
ALS125A THRU ALS140A (FANS PER CKT=5)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,2,3
4
4
1,2,3,4
5
ALS155A THRU ALS170A (FANS PER CKT=6) (Note 1)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,2,3
4
4
1,2,4
5
5
1,2,3,4
6
4
1,2,3
5
5
1,3,4
6
ALS175A THRU 204A (FANS PER CKT=7) (Note 2)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,3
4
6
1,2,3,4
7
ALS205A THRU ALS220A (FANS PER CKT=5)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,2,3
4
4
1,2,3,4
5
ALS205A THRU ALS220A (FANS PER CKT=6) (Note 3)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,2,3
4
4
1,2,4
5
5
1,2,3,4
6
4
1,2,4
5
5
1,2,3,4
6
ALS235A THRU 280A (FANS PER CKT=7)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,2,3
4
(Continued)
IOMM ALS
73
(Table 52 Continued)
ALS300A THRU ALS340A (FANS PER CKT=5)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,2,3
4
4
1,2,3,4
5
ALS360A THRU ALS425A (FANS PER CKT=6)
MicroTech fan stage
Fan output relay on
Total fans operating
0
1
1
1
2
2
1,2
3
3
1,2,3
4
4
1,2,4
5
5
1,2,3,4
6
Notes:
1 On ALS155A thru 170A, two fans are controlled by fan output #4.
2 On ALS175A thru 204A, two fans each are controlled by fan outputs #3 and #4.
3 On ALS205A thru 220A Ckt #3 only and ALS235A thru 280A two fans are controlled by fan output #4.
Each output relay controls one fan except output relay #4 which controls two fans.
Several factors are evaluated by the MicroTech controller to determine the number of fans to be
operated. These include:
1. The compressor loading as percent of full load?
2. The minimum lift pressure required at this load? (The lift pressure equals the discharge pressure
minus the suction pressure.)
3. The addition of a control pressure band to the minimum lift pressure to prevent fan cycling.
4. A target discharge pressure is determined by adding the minimum lift pressure to the suction
pressure.
At any operating condition the MicroTech controller will determine the minimum lift pressure and a
target discharge pressure, and will add or remove operating fans in sequence until the discharge
pressure reaches the target value or falls within the control band of pressure set just above the target
pressure value.
Each fan added has a decreasing percentage effect so the control pressure band is smaller when more
fans are on and largest with only one or two fans on.
Unit operation, with FanTrol, is satisfactory down to outdoor temperatures of 30°F (-1.1°C). Below
this temperature the SpeedTrol option is required to regulate the speed of the first fan on the system
to adequately control the discharge pressure. SpeedTrol option allows unit operation to 0°F (-17.8°C)
outdoor temperature assuming that no greater than 5 mph wind. If SpeedTrol is used in conjunction
with wind baffles and hail guards, the unit can operate down to -10°F (-23°C).
For windy locations operating below 30°F (-1.1°C) outdoor air temperature, wind gusts must be
prevented from blowing into the unit coils by either locating the unit in a protected area, by the
addition of field supplied wind barriers, mounting the optional wind baffles on the unit or any
combination of the above.
FanTrol operation example:
Unit operating at 100% load on both circuits
Suction Pressure = 65 psig (448 kPa)
Minimum lift pressure at 100% load = 12- psig (828 kPa)
Minimum discharge pressure = 65 + 120 psig = 185 psig (1276 kPa)
Discharge pressure control band = 35 psig (241 kPa)
Maximum discharge pressure = 185 + 35 = 220 psig (1517 kPa)
If the discharge pressure is between the minimum of 185 psig (1276 kPa) and maximum of 220 psig
(1517 kPa) the fan stages in operation are correct and if the pressure falls outside this range the
MicroTech controller will stage fans on or off to bring it within range.
74
IOMM ALS
CAUTION
SpeedTrol and FanTrol will provide reasonable operating refrigerant discharge pressures at the
ambient temperatures listed for them provided the coil is not affected by the existence of wind. Wind
baffles must be utilized for low ambient operation below 30°F if the unit is subjected to winds greater
than 5 mph.
Low ambient start
Low ambient start is incorporated into the MicroTech logic. The MicroTech will measure the
difference between freezestat and evaporator pressure and determine the length of time the
compressor will be allowed to run (to build up evaporator pressure) before taking the compressor off
line. The danger of allowing the compressor to run for to long before building up evaporator pressure
is that the evaporator could freeze. The low ambient timer is determined by the pressure as shown in
Table 53. If the low ambient timer is greater than the maximum time allowed the MicroTech will shut off
the compressor and display an alarm.
Table 53, Pressure Difference vs. Time to Alarm
PRESSURE DIFFERENCE BETWEEN
FREEZESTAT AND EVAPORATOR
TIME
(SECONDS)
12 psig (84 kPa)
8 psig (56 kPa)
4 psig (28 kPa)
0 psig (0 kPa)
180
240
300
360
Phase/voltage monitor
The phase/voltage monitor is a device which provides protection against three-phase electrical motor
loss due to power failure conditions, phase loss, and phase reversal. Whenever any of these
conditions occur, a contact opens to the MicroTech controller (PVR Input) which then de-energizes all
inputs.
When proper power is restored, contacts close and MicroTech enables compressors for operation.
When three-phase power has been applied, the output relay should close and the "run light" should
come on. If the output relay does not close, perform the following tests.
1. Check the voltages between L1-L2, L1-L3 and L2-L3. These voltages should be approximately equal
and within +10% of the rated three-phase line-to-line voltage.
2. If these voltages are extremely low or widely unbalanced check the power system to determine the
cause of the problem.
3. If the voltages are within range, use a phase tester to verify that phases are in A,B,C sequence for
L1, L2 and L3. Correct rotation is required for compressor operation. If incorrect phase sequence is
indicated, turn off the power and interchange any two of the supply power leads at the disconnect
switch.
This may be necessary as the phase/voltage monitor is sensitive to phase reversal. Turn on the
power. The output relay should now close after the appropriate delay.
Compressor short cycling protection
MicroTech contains logic to prevent rapid compressor restarting. Excessive compressor starts can be
hard on starting components and create excessive motor winding temperatures. The anti-cycle timers
are set for a five minute stop-to-start cycle and a 15 minute start-to-start cycle. Both are adjustable
through MicroTech.
IOMM ALS
75
Optional Controls
SpeedTrol head pressure control (optional)
The SpeedTrol system of head pressure control operates in conjunction with MicroTech’s standard
head pressure control by modulating the motor speed on fans 11, 21, 31, and 41 in response to
condensing temperature. By reducing the speed of the last fan as the condensing pressure falls, the
unit can operate at lower ambient temperatures. Start-up with low ambient temperature is improved
because the SpeedTrol fans 11, 21,31, and 41 do not start until the condenser pressure builds up.
The SpeedTrol fan motor is a single phase, 208-230/460 volt, thermally protected motor specially
designed for variable speed application. The solid-state speed controls SC11, SC21, SC31, and SC41
are accessible through the panel directly above the control box. Units with 575 volt power have a
transformer mounted inside the condenser fan compartment to step the voltage down to 230 volts for
the SpeedTrol motor.
The SpeedTrol control starts to modulate the motor speed at less than 65°F(18.3°C) and maintains a
minimum condensing pressure of 170 to 180 psig (1172 to 1241 kPa) at full circuit load. For part load
operation the condensing pressure is allowed to fall below this level.
Reduced inrush (delta-delta) start (optional)
Reduced inrush start is available on all voltage units and consists of a 2 contactor arrangement with a
solid state time delay wired in series with the second contactor. Its purpose is to limit current inrush
to the compressors upon start-up. As each compressor starts, the power to the coil of the second
contactor is delayed for 1 second. With the first compressor contactor energized the windings are
connected in series to draw reduced amperage. With the second contactor energized the windings are
connected in parallel.
Control checkout is best accomplished by observation as each contactor is pulled in to see that the 1
second delay occurs before the second contactor pulls in.
Hot gas bypass (optional)
Hot gas bypass is a system for maintaining evaporator pressure at or above a minimum value that
allows continuos operation of the chiller at light load conditions. The purpose of doing this is to keep
the velocity of the refrigerant as it passes through the evaporator high enough for proper oil return to
the compressor when cooling load conditions are light.
The system consists of a pressure regulating valve with an integral solenoid as shown below. The
solenoid valve is factory wired to open whenever the unit thermostat calls for the first stage of
cooling. The pressure regulating valve is factory set to begin opening at 58 psig (400 kPa). For low
temperature operation the valve must be reset. This setting can be changed with an adjustment nut.
To raise the pressure setting, turn the adjustment screw clockwise. To lower the setting, turn the
screw counterclockwise. Do not force the adjustment beyond the range it is designed for, as this will
damage the adjustment assembly.
With the unit operating at 50% or lower circuit load the regulating valve opening can be determined.
The regulating valve opening point can be determined by slowly reducing the system load or
throttling the ball valve on the liquid line at the entrance to the evaporator. Observe the suction
pressure with refrigerant gauges when the hot gas bypass valve cuts in. A slower but alternate
method would be to lower the outlet water temperature to a value where the hot gas bypass valve
starts to open. When the bypass valve starts to open, the refrigerant line on the evaporator side of
the valve will begin to feel warm to the touch.
76
IOMM ALS
Figure 35, Hot Gas Bypass Piping
IOMM ALS
77
Controls, Settings and Functions
Table 54, Controls
DESCRIPTION
Compressor Heaters
FUNCTION
To provide heat to drive off liquid refrigerant when
SYMBOL
HTR1,2,3,4
compressor is off.
SETTING
On, when
RESET
LOCATION
N/A
On the Compressor
N/A
N/A
On the Compressor
N/A
N/A
On the Compressor
N/A
N/A
On the Compressor
compressor is off.
Compressor
In circuit 1,2,3 and 4 energizes to load 50% of
CS11,21,
Solenoid - Top
compressor capacity.
31,41
Compressor
In circuit 1,2,3 and 4 energizes to unload 25% of
CS12,22,
Solenoid - Bottom
compressor capacity.
32,42
Compressor
In circuit 1,2,3 and 4 energizes to load 25% of
CS13,23,
Solenoid - Bottom
compressor capacity.
33,43
Evaporator Heater
Coiled around the evaporator to prevent freezing
HTR5
38oF (3.3oC)
N/A
On the Cooler
EXV (Bd)
N/A
N/A
Control Box
EXV
In Controller Code
N/A
On the Compressor
GD1,2,3,4
None,
Auto
Control Box
the water inside.
Electronic Expansion
To provide power and step control to the EXV
Valve Board
stepper motors commanded by the MCB250.
Electronic Expansion
To provide efficient unit refrigerant flow and control
Valve
superheat.
Gardister Relay
To provide motor temperature protection at about
main liquid line
220oF (104oC).
Liquid Presence Sensor
To protect compressor from starting with liquid or
Inherent in design
LPS1,2,3,4
400 psig (2760 kPa)
Auto
On the Compressor
MHPR1,2,3,4
Refer to IM 549
Auto
Control Box
MCB250
N/A
Refer
Control Box
running without liquid.
Mechanical High
For UL, ETL, etc…safety code to prevent high
High Pressure Switch
pressure above the relief valve.
MicroTech Unit
To control unit and all safeties. Refer to IM 549.
Controller
Motor Protector Relay
to IM 549
To provide voltage isolation to the input board
MPR1,2,3,4
(ADI).
Overloads (Compressor)
to protect the compressor motor from over heating
Defined by
Auto
Control Box
application
OL1-8
N/A
Manual
Control Box
PVM1,2,3,4
N/A
Auto
Control Box
TD5,6,7,8
Set 4Vdc
N/A
Control Box
N/A
Control Box
N/A
Discharge LIne
due to high amps.
Phase Voltage Monitor
to prevent reverse rotation of the motor and
protect it from under/over voltage.
Reduced Inrush
To provide 1 sec delay for reduced inrush.
Time Delay
Signal Converter
Solenoid Valve
for full load amps
To convert AC current signal volts to DC volts.
SIG.Con
0-75 psig
V (SC)
(0-517 kPa)
To allow the unit to run with very low load.
SV5,6,9
Solenoid Valve
To provide a positive shut off of liquid refrigerant
SV1,2,7
N/A
N/A
Liquid Line
Liquid Line
when power is lost.
Solenoid Valve
To only allow liquid injection when the compressor
SV3,4,8
N/A
N/A
On Compressor
Liquid Injection
is running.
SpeedTrol Head
To provide more uniform head pressure control.
SC11,21,
N/A
N/A
Above Control Box
N/A
N/A
Control Box
Hot Gas Bypass
Pressure Control
Surge Capacitor
Liquid Injection
31,41
To protect from high voltage spikes and surges.
C1,2,3,4
Power Side
Notes: Symbol column shows application components for four-compressor units. For two and three compressor units, not all components are applicable
78
IOMM ALS
Troubleshooting Chart
Table 55, Troubleshooting
PROBLEM
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
1.
Main power switch open.
1.
Close switch.
2.
Unit S1 system switch open.
2.
Check unit status on MicroTech display. Close switch.
3.
Circuit switch PS1, PS2, PS3, PS4 in pumpdown position.
3.
Check circuit status on MicroTech display. Close switch.
4.
Evap flow switch not closed.
4.
Check unit status on MicroTech display. Close switch.
5.
Circuit breakers open.
5.
Close circuit breakers.
6.
Fuse blown or circuit breakers tripped.
6.
Check electrical circuits and motor windings for shorts or grounds.
Investigate for possible overloading. Check for loose or corroded
Compressor will not
run.
7.
Unit phase voltage monitor not satisfied.
8.
Compressor overload tripped.
9.
Defective compressor contactor or contactor coil.
10. System shut down by safety devices.
11. No cooling required.
12. Motor electrical trouble.
13. Loose wiring.
connections. Reset breakers or replace fuses after fault is
corrected.
7.
Check unit power wiring to unit for correct phasing. Check voltage.
8.
Overloads are manual reset. Reset overload at button on overload.
Clear alarm on MicroTech.
9.
Check wiring. Repair or replace contactor.
10.
Determine type and cause of shutdown and correct problem before
attempting to restart.
11.
Check control settings. Wait until unit calls for cooling.
12.
See 6,7,8 above.
13.
Check circuits for voltage at required points. Tighten all power wiring
terminals
Compressor Noisy
1.
Compr. Internal problem.
1.
Contact McQuayService
or Vibrating
2.
Liquid injection not adequate.
2.
Check to assure liquid line sightglass is full during steady operation.
Compressor
1.
Low voltage during high load condition.
1.
Check supply voltage for excessive voltage drop.
Overload Relay
2.
Loose power wiring.
2.
Check and tighten all connections.
Tripped or Circuit
3.
Power line fault causing unbalanced voltage.
3.
Check supply voltage.
Breaker Trip or
4.
Defective or grounded wiring in the motor.
4.
Check motor and replace if defective.
Fuses Blown
5.
High discharge pressure.
5.
See corrective steps for high discharge pressure.
Compressor Will
1.
Defective capacity control solenoids.
1.
Check solenoids for proper operation. See capacity control section.
Not Load or Unload
2.
Unloader mechanism defective.
2.
Replace.
1.
Liquid injection solenoid did not open at start.
1.
Check and replace liquid injection solenoid.
2.
Inadequate liquid to liquid injection at start due to a clogged
2.
Check liquid injection line sight glass. If flashing check filter drier
Compressor Liquid
Injection Protection
Trip
filter drier or low charge.
3.
Inadequate liquid to liquid injection during run.
and unit charge.
3.
Check liquid injection line sightglass. If flashing check filter-drier and
unit charge. Discharge pressure too low. Protect condenser coil from
wind.
1.
Discharge shutoff valve partially closed.
1.
Open shutoff valve.
High Discharge
2.
Noncondensables in the system.
2.
Purge the noncondensables from the condenser coil after shutdown.
Pressure
3.
Fans not running.
3.
Check fan fuses and electrical circuits.
IOMM ALS
79
4.
Fan control out of adjustment.
4.
5.
System overcharged with refrigerant.
5.
6.
Dirty condenser coil.
7.
Air recirculation from outlet into unit coils.
8.
Air restriction into unit.
1.
2.
High Discharge
Pressure
Low Discharge
Check that unit setup in MicroTech matches the unit model number.
Check MicroTech condenser pressure sensor for proper operation.
Check for excessive subcooling above 30oF (-1.1oC). Remove the
excess charge.
6.
Clean the condenser coil.
7.
Remove the cause of recirculation.
8.
Remove obstructions near unit.
Wind effect a low ambient temperature.
1.
Protect unit against excessive wind into vertical coils.
Condenser fan control not correct.
2.
Check that unit setup in MicroTech matches the unit model number.
3.
Low section pressure.
3.
See corrective steps for low suction pressure.
4.
Compressor operating unloaded.
4.
See corrective steps for failure to load.
1.
Inadequate refrigerant charge quantity.
1.
Check liquid line sightglass. Check unit for leaks. Repair and
2.
Inadequate liquid to liquid injection at start. Clogged liquid
2.
Check pressure drop across filter-drier. Replace cores.
Check expansion valve superheat and valve opening position.
Pressure
Check SpeedTrol fan on units with SpeedTrol option.
recharge to clear sightglass.
line filter-drier.
Low Suction
Pressure
3.
Expansion valve malfunctioning.
3.
4.
Insufficient water flow to evaporator.
4.
Check water pressure drop across the evaporator and adjust gpm.
5.
Water temperature leaving evaporator is too low.
5.
Adjust water temperature to higher value.
6.
Evaporator tubes fouled.
6.
Inspect by removing water piping. Clean chemically.
7.
Evaporator head ring gasket slippage.
7.
Low suction pressure and low superheat both present may indicate
8.
Glycol in chilled water system
8.
Check glycol concentration
Replace valve only if certain valve is not working.
an internal problem. Consult factory.
1.
Excessive load - high water temperature.
1.
Reduce load or add additional equipment.
High Suction
2.
Compressor unloaders not loading compressor.
2.
See corrective steps below for failure of compressor to load.
Pressure
3.
Superheat is too low.
3.
Check superheat on MicroTech display. Check suction line sensor
installation and sensor.
80
IOMM ALS
Periodic Maintenance Log
IOMM ALS
81
82
IOMM ALS
IOMM ALS
83
13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA
(612) 553-5330
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