McQuay ALS 070A Installation Manual
Installation, Operation and Maintenance Manual
Air-Cooled Screw Compressor Chiller
ALS 070A through 425A
60 Hertz
IOMM ALS-1
Group: Chiller
Part Number: 070774401
Date: June 1999
Supersedes: IOMM ALS
© 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
Remote Evaporator................16
General............................................................16
Startup Procedures .......................................20
Dimensions, Remote Evaporator................22
Water Flow and Pressure Drop25
Physical Data ......................... 27
Major Components................30
Compressor Staging ..............32
Dimensional Data...................34
Unit Layout and Principles of
Operation.............................. 59
Major Component Location.........................59
Control Center ................................................60
Sequence of Operation.................................62
Start-up and Shutdown.......... 64
Seasonal Start-up..........................................64
Temporary Shutdown ...................................64
Start-up After Temporary Shutdown..........65
Extended Shutdown......................................65
Start-up After Extended Shutdown.............66
System Maintenance.............. 67
General............................................................67
Compressor Maintenance............................67
Lubrication.....................................................67
Electrical Terminals........................................67
Condensers ....................................................67
Refrigerant Sightglass..................................68
Lead-Lag.........................................................68
Preventative Maintenance Schedule..........69
Service.................................. 70
Compressor Solenoids..................................70
Filter-Driers.....................................................70
Liquid Line Solenoid Valve..........................71
Liquid Injection Solenoid Valve..................72
Electronic Expansion Valve..........................72
Electronic Expansion Valve Operation.......73
Evaporator......................................................74
Refrigerant Charging.....................................74
Electrical Data........................39
Field Wiring....................................................39
Wire Sizing Ampacities.................................40
Compressor and Condenser Fan Motors..47
Customer Wiring...........................................50
Electrical Data Notes ....................................56
Electrical Legend...........................................57
Typical Field Wiring Diagram......................58
In-Warranty Return Material
Procedure ............................. 76
Standard Controls ................. 77
Optional Controls ..........................................85
Controls, Settings and Functions...............87
Troubleshooting Chart.................................88
Periodic Maintenance Log...........................90
Our facility is ISO 9002 Certified
"McQuay" is a registered trademarks of 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-1
Initial Issue January 1998
1996 McQuay International
Introduction
Liquid Injected
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
Rotary Screw Compressor
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.
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.
Design Vintage
Nominal Tons
CAUTION
IOMM ALS-1 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
through 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-1
Figure 4, Suggested Lifting Method, ALS 300-340
Figure 5, Suggested Lifting Method, ALS 360-425
IOMM ALS-1 5
Location
Care should be taken in the location of the unit to provide proper airflow to the condenser. (See
Figures 6 through 8 for required clearances).
Due to the vertical condenser coil design of the ALS 070A through ALS 425A chillers, it is
recommended that the unit be oriented so that prevailing winds blow parallel to the unit length, thus
minimizing the wind effect on condensing pressure and 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.
McQuay Application Manual, AM ALS/WHS, contains more detail on this subject.
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.
Do not block access to the sides or ends of the unit with piping or conduit. These areas must be open
for service access.
6 IOMM ALS-1
Clearance Requirements
Figure 6, Clearance Requirements, ALS 070-204
Notes:
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-1 7
Figure 7, Clearance Requirements, ALS 205-280
Notes:
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.
8 IOMM ALS-1
Figure 8, Clearance Requirements, ALS 300-425
Notes:
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-1 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 White 0047792932 2600 (1180)
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).
COLOR
OF
STRIPE
McQUAY PART
NUMBER
Table 2, Isolator Loads, ALS 070-204
ALS ISOLATOR LOADS AT EACH MOUNTING LOCATION
UNIT LBS (KG)
SIZE 1 2 3 4 5 6
070 1920 (871) N/A N/A 1332 (604( 1460 (662) N/A N/A 1013 (460)
080 2071 (939) N/A N/A 1437 (652) 1575 (715) N/A N/A 1092 (495)
090 1092 (495) 1229 (557) 1092 (495) 1092 (495) 1229 (557) 1092 (495)
100 1168 (529) 1314 (595) 1168 (529) 1168 (529) 1314 (595) 1168 (529)
125A 1625 (737) 2065 (937) 1270 (576) 1625 (737) 2065 (937) 1270 (576)
140A 1680 (762) 2145 (973) 1350 (612) 1680 (762) 2145 (973) 1350 (612)
155A 1720 (780) 2205 (1000) 1410 (640) 1720 (780) 2205 (1000) 1410 (640)
170A 1760 (785) 2220 (1007) 1425 (647) 1730 (785) 2220 (1007) 1425 (647)
175A 1880 (853) 2350 (1066) 1395 (633) 1880 (853) 2350 (1066) 1395 (633)
185A 1880 (853) 2350 (1066) 1395 (633) 1880 (853) 2350 (1066) 1395 (633)
195A 1920 (871) 2440 (1107) 1440 (653) 1920 (871) 2440 (1107) 1440 (653)
204A 2081 (944) 2644 (1199) 1560 (707) 2081 (944) 2644 (1199) 1560 (707)
RECOMMENDED
MAXIMUM LOAD
LBS. (KG)
Figure 9, Isolator Locations, ALS 070-204
Table 3, Isolator Loads, ALS 205-280
ALS ISOLATOR LOADS AT EACH MOUNTING LOCATION
UNIT LBS (KG)
SIZE 1 2 3 4 5 6 7 8 9 10
205A 1790 (812) 1840 (834) 2040 (925) 1370 (621) 950 (431) 1630 (739) 2020 (916) 1640 (744) 1650 (748) 1000 (454)
220A 1790 (812) 1850 (839) 2050 (930) 1370 (621) 950 (431) 1630 (739) 2030 (921) 1650 (748) 1660 (753) 1000 (454)
235A 1820 (825) 1880 (853) 5080 (943) 1370 (621) 960 (435) 1670 (757) 2060 (934) 1680 (762) 1660 (753) 1000 (454)
250A 1820 (825) 1880 (853) 2080 (943) 1380 (626) 960 (435) 1670 (757) 2060 (934) 1680 (762) 1670 (757) 1000 (454)
265A 1820 (825) 1880 (853) 2080 (943) 1380 (626) 960 (435) 1670 (757) 2060 (934) 1680 (762) 1670 (757) 1000 (454)
280A 1830 (830) 1890 (857) 2080 (943) 1380 (626) 960 (435) 1680 (762) 2070 (939) 1690 (766) 1670 (757) 1000 (454)
10 IOMM ALS-1
Figure 10, Isolator Locations, ALS 205-280 Figure 11, Spring Flex Isolators
Table 4, Isolator Loads, ALS 300 - 340
ALS OPERATING
UNIT ISOLATOR LOADS AT EACH MOUNTING LOCATIONS, lb (kg) WEIGHT
SIZE 1 2 3 4 5 6 7 8 9 10 LBS (KGS)
300A 1780 (807) 2060 (934) 2530 (1147) 2530 (1147) 2560 (1161) 2560 (1161) 2170 (984) 2170 (984) 1445 (655) 1445 (655) 21250 (9637)
315A 1780 (807) 2060 (934) 2530 (1147) 2530 (1147) 2560 (1161) 2560 (1161) 2170 (984) 2170 (984) 1445 (655) 1445 (655) 21250 (9637)
330A 1780 (807) 2060 (934) 2540 (1152) 2540 (1152) 2570 (1166) 2570 (1166) 2180 (989) 2180 (989) 1450 (658) 1450 (658) 21320 (9669)
340A 1780 (807) 2060 (934) 2540 (1152) 2540 (1152) 2570 (1166) 2570 (1166) 2180 (989) 2180 (989) 1450 (658) 1450 (658) 21320 (9669)
Note:
1. Unit to be supported at (5) isolator mounting locations per side, 10 total, as indicated.
2. Add approximately 370 lbs (168 kgs) at each isolator location for unit with optional copper finned condenser coils.
3. Unit to be level in both directions within 1/8 inch (3 mm) per 10 feet (3 m).
4. See 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 OF MAXIMUM LOAD
COLOR RECOMMENDED
STRIPE
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).
McQUAY PART
NUMBER
LB (KG)
Table 6, Isolator Loads, ALS 360-425
ALS
UNIT
SIZE 1 2 3 4 5 6 7 8 9 10 11 12
360A 1780 807 2060 934 2530 1147 2530 (1147) 2540 1152 2540 (1152) 1670 (757) 1670 (757) 1720 (780) 1720 (780) 1080 (490) 1080 (490)
370A 1780 807 2060 934 2540 1152 2540 (1152) 2550 1156 2550 (1156) 1675 (760) 1675 (760) 1720 (780) 1720 (780) 1080 (490) 1080 (490)
380A 1780 807 2060 934 2550 1156 2550 (1156) 2560 1161 2560 (1161) 1680 (762) 1680 (762) 1720 (780) 1720 (780) 1080 (490) 1080 (490)
425A 1846 837 2126 964 2616 1186 2616 (1186) 2626 1190 2626 (1190) 1746 (791) 1746 (791) 1768 (801) 1768 (801) 1146 (520) 1146 (520)
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.
ISOLATOR LOAD AT EACH MOUNTING LOCATIONS, lb (kg) .
IOMM ALS-1 11
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 OF MAXIMUM LOAD
COLOR RECOMMENDED
STRIPE
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).
MCQUAY PART
NUMBER
LBS (KG)
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-1
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. See Application Manual, AM ALS/WHS for more detail on this subject.
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 IM549-1 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 to the exposed piping.
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-1 13
Figure 14, Typical Field Water Piping
Vent
Outlet
Valved
pressure
gauge
Vibration
Eliminator
Flow
Switch
Balancing
valve
Gate valve
Protect all field piping
against freezing
Drain
Vibration
Eliminator
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
1 1/4" (32mm) pipe dia.
Min. after switch
Flow direction marked
on switch
1" (25mm) NPT flow
switch connection
Tee
1 1/4" (32mm) dia.
Min. before switch
NOMINAL PIPE SIZE
INCHES (MM)
5 (127) 58.7 (3.7)
6 (152) 79.2 (5.0)
8 (203) 140 (8.8)
Note: Water pressure differential switch is not recommended for
outdoor applications.
MINIMUM REQUIRED FLOW TO
ACTIVATE SWITCH - GPM (LPS)
14 IOMM ALS-1
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 23 through Figure 27 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 chiller's 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:
tons flowfactor
GPM
24
Delta T=−
3. Pressure drop - To determine pressure drop through the cooler, when using glycol, enter the
water pressure drop curve, Figure 21 or Figure 22,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 the supplier normally recommends that a minimum of 25% solution by weight
be used for protection against corrosion.
CAUTION
Do not use automotive grade antifreeze. Industrial grade glycols must be used. Automotive antifreeze
contains inhibitors that 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
FREEZE
%
E.G.
10 26 -3 0.987 0.992 1.010 1.068
20 19 -7 0.975 0.985 1.028 1.147
30 9 -13 0.962 0.978 1.050 1.248
40 -5 -21 0.946 0.971 1.078 1.366
50 -27 -33 0.965 0.965 1.116 1.481
PT.
oFo
CAP POWER FLOW PD
C
Table 10, Ethylene Glycol
FREEZE
%
E.G.
10 26 -3 0.991 0.996 1.013 1.070
20 18 -8 0.982 0.992 1.040 1.129
30 7 -14 0.972 0.986 1.074 1.181
40 -7 -22 0.961 0.976 1.121 1.263
50 -28 -33 0.946 0.966 1.178 1.308
PT.
oFo
CAP POWER FLOW PD
C
IOMM ALS-1 15
Remote Evaporator
General
The multiple compressor ALS air-cooled chillers are available with remote evaporator. This allows the
main unit to be installed outdoors to save interior room and eliminates the need for anti-freeze
solutions and heat tracing of chilled water lines since the chilled water system is indoors. There are
some general guidelines to review before proceeding:
1. Applies to Models ALS 125 through ALS 425.
2. R-22 only.
3. Maximum line length of 50 ft (15 m) and Total Equivalent Length (TEL) of 120 ft (37 m).
4. Evaporator not more than 6 ft (1.8 m) above the compressor or 16 ft (5 m) below compressor.
5. No underground piping.
6. No hot gas bypass.
7. Units with remote evaporator are not included in the ARI Certification Program.
The remote evaporator is shipped separately, ready for quick and easy installation at the job site. All
refrigerant accessories such as liquid-vapor line shut-off valves, replaceable core filter-driers, liquid
line solenoid valves, electronic expansion valves, and sightglasses are already included on the ALS
condensing unit. The evaporator is equipped with entering and leaving chilled water temperature
sensor wells. The sensors are pre-wired to the ALS unit with 75 feet long sensor leads that must be
field connected to the evaporator thermowells. Suction pressure transducers and temperature sensors
must also be relocated to the evaporator. ALS units are factory charged with a full unit charge
including 10 feet (3 meters) of refrigerant line. Field piping must be leak tested, evacuated and charged
during installation. Do not exceed 150 psig test pressure unless the unit is blanked off from the
piping.
Performance Derate Factors
All performance tables and adjustment factors found in the air-cooled screw chiller catalog (PM ALS-
1) are applicable for remote evaporator installations. However, a performance derate must be applied
to the R-22 performance data due to additional pressure drops in the suction and liquid lines which
cause a loss of compressor performance. These derates are based on a suction line pressure drop
equivalent of approximately 2°F (1°C) change in saturation temperature.
For R-22 applications:
Capacity = Tons(kW) x 0.97
Power = Compressor kW x 0.99
Suction Lines
General
Careful design of the refrigerant piping is necessary for efficient system operation. The refrigerant
piping should be designed for a low pressure drop to obtain maximum capacity and efficiency while
maintaining adequate velocity. Lines should slope in the direction of flow to assure good oil return to
the compressors. Cost considerations favor keeping line sizes as small as possible while not
exceeding acceptable pressure drops in order to maintain unit performance.
NOTE
All refrigerant piping must be reviewed by McQuay Application Engineers prior to
order entry and will be verified by McQuay startup technicians.
16 IOMM ALS-1
Suction line sizing
Pressure drop in the suction line reduces system capacity and efficiency because it forces the
compressor to operate at lower suction pressure. The suction line should be sized for a pressure drop
approximately equivalent of 2°F (1°C) change in saturation temperature. For suction line sizing see
Table 11 through Table 13. For applications with the evaporator below the ALS unit, the vertical
section of the suction lines must be sized to return oil to the compressors at the minimum compressor
capacity step.
Example of Suction Line Size Calculation
ALS140A condensing unit with refrigerant R-22
Evaporator located 5 feet below the ALS compressor.
Lineal length of horizontal suction line is 25 feet
Suction line requires 7 long radius (90°) elbows; 3 in the horizontal, 4 in the riser
From Table 11, the nominal circuit capacities for circuit 1 and 2 are 65 and 80 tons respectively
Total lineal suction line length = 30 feet each circuit (25 feet horizontal plus 5 feet vertical riser).
For the first try, assume that the total equivalent suction line length is twice the lineal suction line
length.
Therefore the estimated total equivalent suction line length = 60 feet
From Table 12 and Table 13, For nominal circuit capacities of 65 & 80 tons and equivalent line length of
60 ft, the suction line size = 2 5/8" for horizontal lines and 2 1/8" for vertical lines.
From Table 16, Fitting loss for 2 5/8" long radius (90°) elbow = 4.1 ft, and 3.3 ft for the 2 1/8 elbows.
Therefore fitting loss in equivalent feet of pipe for (3) 2 5/8" long radius (90°) elbow = 12.3 ft, and
13.2ft for (4) 2 1/8" elbows.
Therefore the actual equivalent suction line length = 30 + 12.3 + 13.2 = 55.5 feet
From Table 12 and Table 13, For nominal circuit capacities of 65 & 80 tons and equivalent line length of
55.5 ft the suction line size is correct.
Table 11, ALS 125A-280A Nominal Circuit Capacities
ALS Model
125A 65 (229) 65 (229) - 140A 65 (229) 80 (262) - 155A 80 (262) 80 (262) - 170A 80 (262) 95 (334) - 175A 80 (262) 95 (334) - 185A 95 (334) 95 (334) - 195A 95 (334) 95 (334) - 204A 95 (334) 95 (334) - 205A 65 (229) 65 (229) 80 (262) 220A 65 (229) 80 (262) 80 (262) 235A 80 (262) 80 (262) 80 (262) 250A 80 (262) 80 (262) 95 (334) 265A 80 (262) 95 (334) 95 (334) 280A 95 (334) 95 (334) 95 (334) 300A 65 (229) 65 (229) 80 (262) 80 (262)
315A 65 (229) 80 (262) 80 (262) 80 (262)
330A 80 (262) 80 (262) 80 (262) 80 (262)
340A 80 (262) 80 (262) 80 (262) 95 (334)
360A 80 (262) 80 (262) 95 (334) 95 (334)
370A 80 (262) 95 (334) 95 (334) 95 (334)
380A 95 (334) 95 (334) 95 (334) 95 (334)
425A 95 (334) 95 (334) 95 (334) 95 (334)
Circuit 1 Circuit 2 Circuit 3 Circuit 4
Tons (kW) Tons (kW) Tons (kW) Tons (kW)
IOMM ALS-1 17
Table 12, Vertical Upflow Suction Line Sizes
Nominal Circuit
Capacity
Tons (kW) Equivalent Line Length Ft (m) Suction Line Size (in.)
65 (2290
80 (262)
95 (334)
Vertical Upflow Suction Lines
40 (12) 2 1/8
75 (23) 2 1/8
40 (12) 2 1/8
75 (23) 2 1/8
40 (12) 2 5/8
75 (23) 2 5/8
Table 13, Horizontal and Vertical Downflow Suction Line Sizes
Capacity
Tons (kW)
65 (229) 75 (23) 2 5/8
80 (262) 75 (23) 2 5/8
95 (334) 75 (23) 3 1/8
Vertical Downflow and Horizontal Suction LinesNominal Circuit
Equivalent Line Length Ft (m) Suction Line Size, in.
40 (12) 2 5/8
115 (35) 2 5/8
40 (12) 2 5/8
115 (35) 3 1/8
40 (12) 2 5/8
115 (35) 3 1/8
Liquid-Vapor Lines
The liquid-vapor line from the ALS condensing unit to the evaporator liquid connection is not a
conventional liquid line since it carries both liquid and vapor. The compressors on the ALS units
utilize a liquid cooled motor and an economizer. Therefore the expansion valve which feeds the full
flow of liquid refrigerant into the compressor for motor cooling is mounted in the liquid line between
the condenser sub-cooling coil and the compressor inlet; not at the evaporator inlet. The liquid-vapor
line to the evaporator is a low pressure line downstream of the expansion valve and the size is slightly
larger than a normal liquid line. For liquid line sizing see Table 14 and Table 15.
Table 14, Vertical Upflow Liquid-Vapor Line Sizes
Capacity
Tons (kW)
65 (2290
80 (262)
95 (334)
Equivalent Line Length
Vertical Upflow Liquid-Vapor LinesNominal Circuit
Ft (m)
40 (12) 1 3/8
75 (23) 1 3/8
40 (12) 1 3/8
75 (23) 1 3/8
40 (12) 1 5/8
75 (23) 1 5/8
Liquid-Vapor Line Size
o.d (in.)
Table 15, Horizontal and Vertical Downflow Liquid-Vapor Line Sizes
Capacity
Tons (kW)
65 (229) 75 (23) 1 3/8
80 (262) 75 (23) 1 5/8
95 (334) 75 (23) 1 5/8
Vertical Downflow and Horizontal Liquid-Vapor LinesNominal Circuit
Equivalent Line Length
Ft (m)
40 (12) 1 3/8
115 (35) 1 3/8
40 (12) 1 3/8
115 (35) 1 5/8
40 (12) 1 5/8
115 (35) 1 5/8
Liquid-Vapor Line Size
o.d (in.)
18 IOMM ALS-1
Insulation
All piping joints and fittings must be thoroughly leak tested before insulation is applied. Suction lines
must be insulated and should not be installed underground. Suction line insulation must be selected
to prevent condensation under local ambient conditions with the lines at 40°F to 50°F (4.4°C to 10°C)
operating temperatures. The liquid-vapor lines will operate at 40°F to 60°F (4.4°C to 15.6°C) and must
also be insulated to prevent sweating and heat gain.
Location and Arrangement
Refrigerant lines should be as short and direct as possible to minimize tubing and fittings. Long
radius elbows must be used (except for traps) to minimize the pressure drops. Traps should be as
short as possible to minimize oil accumulation. Refrigerant piping should be arranged so that normal
inspection of the equipment is not hindered. Adequate clearance should be provided between
refrigerant piping and adjacent walls for insulation. Piping should be run so that it does not interfere
with compressor service access, passages or obstruct headroom, windows and doors. Suction line
hangers must be sized and located to support the weight of the piping in accordance with good piping
practice.
Suction and liquid-vapor connection points for each circuit are labeled to facilitate field piping. Care
must be exercised in routing the piping to avoid mixing piping from different circuits. The circuits on
the outdoor ALS unit must match the circuits on the evaporator (i.e. circuit #1 on the outdoor ALS unit
must be connected with circuit #1 on the evaporator).
Horizontal portions of the suction lines must be downward sloping toward the compressors. Slope all
piping in the direction of flow. Vertical portions of the suction lines must be sized for oil return at
minimum compressor load.
Note: Double section risers must not be utilized on any circuit. Traps must be provided as shown on
Figure 16 and Figure 17.
Equivalent Line Lengths
Recommended refrigerant line sizes are based on equivalent line lengths of straight pipe, that is, a
combination of straight pipe, fittings and valves. The pressure drop through valves and fittings is
determined by establishing the equivalent straight length of pipe of the same size with the same
friction loss. The "Total Equivalent Length" is the sum of the "Lineal Line Length" and the
appropriate "Valve and Fitting Losses in Equivalent Feet of Pipe for Field Supplied Piping" given in
Table 16
Table 16, Fitting Equivalent Feet of Pipe
Line Size (in.) Angle Valve Globe Valve 90° Std. Radius Elbow 90° Long Radius Elbow
1 1/8 12 29 2.6 1.7
1 3/8 15 38 3.3 2.3
1 5/8 18 43 4.0 2.6
2 1/8 24 55 5.0 3.3
2 5/8 29 69 6.0 4.1
3 1/8 35 84 7.5 5.0
Figure 16, Evaporator Above ALS Unit
IOMM ALS-1 19
Figure 17, Evaporator Below ALS Unit
ALS Unit
Suction Line
Evaporator
Trap
NOTE: Keep the trap width at a minimum to avoid trapping excessive oil.
Startup Procedures
NOTE: McQuayService or an authorized McQuay service agent must do initial start-up and
commissioning.
Filter Driers
Following an initial 24 hour operation the pressure drop across the replaceable core, filter drier should
be checked. If this pressure drop exceeds the values given in Table 17 at the various load conditions
the filter drier cores must be replaced. Also if the moisture indicating sight glass shows a wet system
condition after 24 hours of operation the filter cores must be changed. This should remove any
contaminants introduced during field piping. The filter drier cores must also be changed anytime the
system is opened for servicing.
Table 17, Filter Drier Pressure Drop
Percent Circuit
Loading (%)
100 10 (69.0)
75 8 (55.2)
50 5 (34.5)
25 4 (27.6)
Maximum Recommended Pressure Drop Across Filter Drier
psig (kPa)
Refrigerant and Oil Charge
The relative position of the ALS unit and the evaporator and the distance between them plays a
critical role in determining suction and liquid line sizes and the field refrigerant and oil charges. ALS
units with the remote evaporator option are shipped with a factory refrigerant and oil charge suitable
for the normal packaged unit. It will be necessary to add refrigerant and oil for the added connecting
piping to the remote evaporator. See Table 18 for refrigerant charge for suction and liquid-vapor lines.
McQuayService will supply and add the additional oil required by the refrigerant piping. The correct
oil is Planetelf ACD68AW, McQuay Part No. 735030439 (5 gal.), 735030438 (1 gal.).
Charging Procedure
The calculated refrigerant and oil charge must be added through the factory supplied charging valve
located on the liquid-vapor line coming out of the compressor. Sufficient charge must be added to
clear the liquid line sight glass located at the outlet of the condenser. Add an extra 10 lb. of refrigerant
after the sight glass is clear.
Note: Charge must never be added through the compressor suction line.
20 IOMM ALS-1
Table 18, Refrigerant Charge for Suction and Liquid-Vapor Lines
Lineal Tubing
Length
Ft (m)
10 (3) 2 5/8 0.51 (0.23) 1 5/8 5.0 (2.3)
20 (6) 2 5/8 1.02 (0.46) 1 5/8 10.0 (4.5)
30 (9) 2 5/8 1.53 (0.69) 1 5/8 15.0 (6.8)
40 (12) 2 5/8 2.04 (0.92) 1 5/8 20.0 (9.0)
Suction Line Refrigerant Charge
lb (kg)
Line (in.) R-22 Line (in.) R-22
2 1/8 0.33 (0.15) 1 3/8 3.6 (1.6)
3 1/8 0.71 (0.32)
2 1/8 0.66 (0.30) 1 3/8 7.2 (3.3)
3 1/8 1.42 (0.64)
2 1/8 0.99 (0.45) 1 3/8 10.8 (4.9)
3 1/8 2.13 (0.96)
2 1/8 1.32 (0.60) 1 3/8 14.4 (6.5)
3 1/8 2.84 (1.29)
Liquid-Vapor Line Refrigerant Charge
lb (kg)
Oil Charge Calculation
Total Field Oil Charge = 4% by weight of the field refrigerant charge added to the suction and liquidvapor lines.
Note: For every 10 lb. (160 oz) of refrigerant charge added, a 6.4 oz (equal to 0.4 pint fluid measure) oil
charge is required.
Example: (In I-P Units)
Total suction line lineal length = 20 ft.; Suction line size = 2 5/8 in.
Total liquid-vapor line lineal length = 30 ft.; Liquid-Vapor line size = 1 5/8
From Table 18 obtain the suction and liquid-vapor line refrigerant charge
Refrigerant charge required in the suction line = 1.0 lb.
Refrigerant charge required in the liquid-vapor line = 15.0 lb.
Total Refrigerant charge required in the suction and liquid-vapor line = 16.0 lb.
Total Oil Charge = 4% by weight of the total field refrigerant charge added to the suction and liquidvapor lines = 10.3 oz (0.6 pint)
Notes:
1. The only approved oil is that identified on the label attached to the compressors. All POE oils are
hygroscopic and care should be exercised in handling the oil to avoid absorption and retention of
moisture.
2. Do not leave the oil container open for more than a minute while charging oil. Do not use oil that
has not been properly sealed and stored.
3. The evaporator is supplied without heater.
Dimensions
Use the ALS dimension drawings Figure 23 to Figure 27 for the ALS with remote evaporator. The
refrigerant connections are located approximately where the refrigerant connections to the unit
mounted evaporator are on a packaged chiller. The remote evaporator dimensions are Figure 18
through Figure 20.
IOMM ALS-1 21
Dimensions, Remote Evaporator
Figure 18, Evaporator for ALS 125 - ALS 204
ALS Model
Number
125 CDE-1410-1 103.80 (2637) 13.00 (330) 6.0 (152) 9.01 (229) 2 5/8 (67) 1 3/8 (35 0) 36.1 (136.6) 4.71 (.13)
155,170,175,185 CDE-1610-1 105.58 (2682) 13.00 (330) 6.0 (152) 8.12 (206) 2 5/8 (67) 1 3/8 (35 0) 45.6 (172.6) 6.37 (.18)
140 CDE-1610-2 105.58 (2682) 13.00 (330) 6.0 (152) 8.12 (206) 2 5/8 (67) 1 3/8 (35 0) 50.3 (190.4) 5.82 (.16)
195 CDE-1810-1 105.58 (2682) 14.00 (356) 6.0 (152) 8.12 (206) 2 5/8 (67) 1 3/8 (35 0) 58.4 (221.1) 8.16 (.23)
204 CDE-2010-1 103.70 (2634) 13.50 (343) 8.0 (203) 9.23 (234) 2 5/8 (67) 1 3/8 (35 0) 72.3 (273.7) 10.10 (.29)
CDE Model
Number
CDE-1410-1 128.31 (3259) 14.37 (365) 22.63 (575) 13.00 (330) 2.45 (62) 4.13 (105) 1.50 (38) 4.88 (124)
CDE-1610-1 128.31 (3259) 14.62 (371) 22.63 (575) 13.00 (330) 2.75 (70) 5.12 (130) 1.50 (38) 5.50 (140)
CDE-1610-2 128.31 (3259) 14.62 (371) 22.63 (575) 13.00 (330) 2.75 (70) 5.12 (130) 1.50 (38) 5.50 (140)
CDE-1810-1 129.32 (3285) 14.87 (378) 24.62 (625) 14.37 (365) 2.75 (70) 5.12 (130) 1.00 (25) 5.50 (140)
CDE-2010-1 128.81 (3272) 14.62 (371) 25.12 (638) 16.02 (407) 3.25 (83) 5.25 (133) 1.50 (38) 7.12 (181)
CDE Model
Number
CDE-1410-1 3.25 (83) 1.50 (38) 121.81 (3094) 123.81 (3145) 1.53 (39) 1.70 (43) 19.25 (489) 19.25 (489) 125 (32)
CDE-1610-1 3.25 (83) 1.50 (38) 121.81 (3094) 123.81 (3145) 1.53 (39) 1.70 (43) 19.25 (489) 19.25 (489) 125 (32)
CDE-1610-2 3.25 (83) 1.50 (38) 121.81 (3094) 123.81 (3145) 1.53 (39) 1.70 (43) 19.25 (489) 19.25 (489) 125 (32)
CDE-1810-1 3.25 (83) 2.50 (64) 121.81 (3094) 123.81 (3145) 1.53 (39) 1.70 (43) 21.25 (540) 21.25 (540) 125 (32)
CDE-2010-1 4.13 (105) 1.50 (38) 122.61 (3103) 124.58 (3164) 1.53 (39) 1.70 (43) 24.62 (625) 29.00 (737) 1.75 (44)
CDE Model
Number
CDE-1410-1 60.91 (1547) 13.00 (330) 8.00 (203) 10.3 (4.7) 10.3 (4.7) 1845 (837) 1790 (812)
CDE-1610-1 60.91 (1547) 13.00 (330) 8.00 (203) 13.9 (6.3) 13.9 (6.3) 2285 (1036) 2145 (973)
CDE-1610-2 60.91 (1547) 13.00 (330) 8.00 (203) 12.7 (5.8) 12.7 (5.8) 2285 (1036) 2110 (957)
CDE-1810-1 60.91 (1547) 14.00 (356) 8.00 (203) 17.8 (8.1) 17.8 (801) 2750 (1247) 2475 (1123)
CDE-2010-1 61.08 (1551) 13.50 (343) 13.50 (343) 22.8 (10.3) 22.8 (10.3) 3158 (1432) 2819 (1279)
CDE Model
Number
A D E F G H I J
K O R S U V W CC DD
Center of Gravity - Inches (mm) Operating Charge - Lbs. (kgs) R-22 Unit Weights - Lbs. (kgs)
X Y Z System #1 System #2 Operating Shipping
Water Connection - Inches (mm) Refrigerant Connection
C L P T M N
Dimensional Data - Inches (mm)
Dimensional Data - Inches (mm)
Water Volume
Gallons(Litre)
Refrig. Volume
Cu.Ft. (cu.mm)
22 IOMM ALS-1
Figure 19, Evaporator for ALS 205 - ALS 280
Cu.Ft. (cu. mm)
System #2
System #3
Number
250, 265, 280 CDE-2010-1 72.3 (274) 10.1 (0.29) 15.2 (6.9) 15.2 (6.9) 15.2 (6.9) 3165 (1435) 2825 (1281)
205, 220, 235 CDE-2010-2 80.9 (306) 9.4 (0.26) 14.0 (6.4) 14.0 (6.4) 14.0 (6.4) 3165 (1435) 2775 (1258)
CDE Model
Number
Water Volume
Refrig. Volume
Cu. Ft. (cu. mm)
Operating Charge - Lbs. (kgs) Unit Weights - Lbs. (kgs)ALS Model
System #1
Operating Shipping
IOMM ALS-1 23
Figure 20, Evaporator for ALS 300 - ALS 425
5.25 (133)
9.38 (238)
5.25 (133)
9.38 (238)
5.25 (133)
9.38 (238)
122.73 (3117)
122.73 (3117)
146.73 (3727)
Cu. Feet (Cu. M)
Number
330,340,360,370,380 CDE-2410-1 103.70 (2634) 7.68 (195) 2.30 (58) 6.66 (169) 2.22 (56)
300,315 CDE-2410-2 103.70 (2634) 7.68 (195) 2.30 (58) 6.66 (169) 2.22 (56)
425 CDE-2412-1 125.28 (3182) 7.68 (195) 2.30 (58) 6.66 (169) 2.22 (56)
Number
CDE-2410-1 7.12 (181) 1.53 (39) 4.13 (105)
CDE-2410-2 7.12 (181) 1.53 (39) 4.13 (105)
CDE-2412-1 7.12 (181) 1.53 (39) 4.13 (105)
Number
CDE-2410-1 13.50 (343) 18.00 (457) 61.37 (1559) 107 (405) 13.5 (0.38) 4250# (1927) 3700# (1678)
CDE-2410-2 13.50 (343) 18.00 (457) 61.37 (1559) 112 (424) 12.8 (0.36) 4290# (1946) 3640# (1651)
CDE-2412-1 13.50 (343) 18.00 (457) 73.37 (1863) 128 (485) 15.5 (0.44) 5100# (2313) 4400# (1996)
CDE Model Operating Charge - Lbs. (kgs.) R-22
Number System #1 System #2 System #3 System #4
CDE-2410-1 15 (6.8) 15 (6.8) 15 (6.8) 15 (6.8)
CDE-2410-2 14 (6.4) 14 (6.4) 14 (6.4) 14 (6.4)
CDE-2412-1 20 (9.1) 20 (9.1) 20 (9.1) 20 (9.1)
CDE Model
Number
I J K L M N O
Center of Gravity - Inches (mm) Unit Weights - Lbs. (kgs)CDE Model
P Q R
A B C D E F G H
Dimensional Data - Inches (mm)CDE Model
Dimensional Data - Inches (mm)ALS Model
Water Volume
Gallons (Litre)
7.50 (191)
7.50 (191)
7.50 (191)
125.17 (3179) 129.05 (3278) 9.52 (242)
125.17 (3179) 129.05 (3278) 9.52 (242)
149.17 (3789) 153.05 (3887) 10.73 (273)
Refrig. Volume
Operating Shipping
24 IOMM ALS-1
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 19 and Table 20. Flow rates below the minimum values shown
will result in laminar flow that 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 valve or strainer pressure drop 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 19, ALS 070 - 100, and ALS 220 - 265 Min/Max Flow Rates
ALS UNIT
SIZE GPM LPS GPM LPS SIZE GPM LPS GPM LPS
070 102 6.5 272 17.2 220 335 21.2 893 56.4
080 122 7.7 324 20.5 235 356 22.5 950 60.0
090 139 8.8 369 23.4 250 376 23.8 1000 63.2
100 147 9.3 391 24.8 265 391 24.7 1043 66.0
MIN. FLOW
RATE
Figure 21, ALS 070 - 100, Evaporator Pressure Drop
MAX FLOW RATE
ALS UNIT
MIN. FLOW
RATE
MAX. FLOW
RATE
IOMM ALS-1 25
Table 20, ALS 125 – 205 and ALS 280 - 425 Min/Max Flow Rates
ALS UNIT
SIZE GPM LPS GPM LPS SIZE GPM LPS GPM LPS
125 186 11.8 497 31.4 280 408 25.8 1088 68.8
140 209 13.2 557 35.2 300 440 27.8 1173 74.1
155 231 14.6 617 39.0 315 459 29.0 1222 77.1
170 253 16.0 675 42.7 330 479 30.2 1276 80.6
175 256 16.2 683 43.2 340 493 31.1 1313 82.9
185 274 17.3 730 46.1 360 523 33.0 1395 88.1
195 284 18.0 767 48.5 370 540 34.1 1438 90.8
204 303 19.1 808 51.0 380 559 35.3 1490 94.1
205 309 19.5 825 52.1 425 616 38.9 1650 104.2
MIN. FLOW
RATE
MAX FLOW RATE
ALS UNIT
MIN. FLOW
RATE
Figure 22, ALS 125 - 425, Evaporator Pressure Drop
MAX. FLOW
RATE
26 IOMM ALS-1
Physical Data
Table 21, ALS 070-100
DATA
BASIC DATA
Unit capacity @ ARI conditions, tons
(kW)
Unit operating charge R-22, lbs (kg) 150 (68) 160 (73) 180 (82) 190 (87)
Cabinet dimensions L x W x H, in.
(mm)
Unit operating weight, lbs. (kg) 5725 (2597) 6175 (2801) 6825 (3096) 7300 (3311)
Unit shipping weight, lbs. (kg) 5500 (2495) 5900 (2676) 6500 (2948) 6900 (3130)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal tons, (kW0 65 (230) 80(280) 95 (335) 95 (335)
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m2) 115.6 (10.7) 115.6 (10.7) 154.1 (14.3) 154.1 (14.3)
Finned height x finned length, in.
(mm)
Fins per inch x rows deep 16 x 3 16 x 3 16 x 3 16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm) 6-28 (711) 6-28 (711) 8-28 (711) 8-28 (711)
No. of motors - hp (kW) 6-1.5 (1.1) 6-1.5 (1.1) 6-1.5 (1.1) 6-1.5 (1.1)
Fan & motor rpm, 60/50Hz 1140 1140 1140 1140
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) 24.3 (92.0) 32.6 (123.4) 41.3 (156.3) 43.6 (165)
Max. water pressure, psi (kPa) 175 (1207) 175 (1207) 175 (1207) 175 (1207)
Max. refrigerant pressure, psi (kPa) 225 (1552) 225 (1552) 225 (1552) 225 (1552)
070A 080A 090A 100A
68.1 (239) 77.9 (274) 90.6 (319) 96.4 (339)
124.7 X 83.4 X 92.5
(3167 X 2118 X 2350)
160 x 104
(4064 x 2642)
8357 8357 8357 8357
54120 54120 72160 72160
12-08
(305-2439)
124.7 X 83.4 X 92.5
(3167 X 2118 X 2350)
161 x 104
(4064 x 2642)
(356-2439)
ALS MODEL NUMBER
14008
159.4 X 83.4 X 92.5
(4049 X 2118 X 2350)
160 x 138.7)
4064 x 3523)
14-10
(356-3048)
159.4 X 83.4 X 92.5
(4049 X 2118 X 2350)
160 x 138.7)
4064 x 3523)
16-10
(407-3048)
Table 22, ALS 125-170
ALS MODEL NUMBER
DATA 125A 140A 155A 170A
BASIC DATA
Unit capacity @ ARI conditions, tons
(kW)
Unit operating charge R-22, lbs (kg) 140 (63.5) 140 (63.5) 140 (63.5) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 160 (72.6)
Cabinet dimensions L x W x H, in.
(mm)
Unit operating weight, lbs. (kg) 9920 (4500) 10350 (4700) 10670 (4840) 10750 (4880)
Unit shipping weight, lbs. (kg) 9600 (4355) 9900 (4450) 10250 (4650) 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)
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m2) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7)
Finned height x finned length, in.
(mm)
Fins per inch x rows deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm) 10 - 28 (711) 10 - 28 (711) 12 - 28 (711) 12 - 28 (711)
No. of motors - hp (kW) 10 - 1.5 (1.1) 10 - 1.5 (1.1) 12 - 1.5 (1.1) 12 - 1.5 (1.1)
Fan & motor rpm, 60/50Hz 1140/950 1140/950 1140/950 1140/950
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)
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)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
80 x 208
(2032 x 5283)
8357
(35.4)
90200
(35.5)
14 - 10
(356 - 3048)
80 x 208
(2032 x 5283)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
80 x 208
(2032 x 5283)
8357
(35.4)
90200
(35.5)
16 - 10
(406 - 3048)
80 x 208
(2032 x 5283)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
80 x 208
(2032 x 5283)
8357
(35.4)
108240
(42.6)
16 - 10
(406 - 3048)
80 x 208
(2032 x 5283)
228.7 x 83.4 x 92.5
(5809 x 2118 x 2350)
80 x 208
(2032 x 5283)
8357
(35.4)
108240
(42.6)
16 - 10
(406 - 3048)
80 x 208
(2032 x 5283)
IOMM ALS-1 27
Water volume, gallons (L) 36.1 (136.7) 45.6 (172.6) 45.6 (172.6) 45.6 (172.6)
Max. water pressure, psi (kPa) 175 (1207) 175 (1207) 175 (1207) 175 (1207)
Max. refrigerant pressure, psi (kPa) 225 (1552) 225 (1552) 225 (1552) 225 (1552)
Table 23, ALS 175-204
ALS MODEL NUMBER
DATA 175A 185A 195A 204A
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) 11250 (5100) 11250 (5100) 11500 (5218) 12570 (5701)
Unit shipping weight, lbs. (kg) 10850 (4920) 10850 (4920) 11100 (5036) 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)
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m2) 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) 135.0
Finned height x finned length, in.
(mm)
Fins per inch x rows deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 12 x 4 12 x 4
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in.
(mm)
No. of motors - hp (kW) 14 - 1.5 (1.1) 14 - 1.5 (1.1) 14 - 1.5 (1.1) 14 - 2.0 (1.5)
Fan & motor rpm, 60/50Hz 1140/950 1140/950 1140/950 1140/950
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) 43.6 (165.0) 43.6 (165.0) 57.3 (216.9) 69.6 (263.5)
Max. water pressure, psi (kPa) 175 (1207) 175 (1207) 175 (1207) 175 (1207)
Max. refrigerant pressure, psi
(kPa)
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)
80 x 243
(2032 x
6172)
14 - 28 (711) 14 - 28 (711) 14 - 28 (711) 14 - 28 (711)
(406 - 3048)
80 x 243
(2032 x 6172)
8357
(35.4)
126280
(49.7)
16 - 10
225 (1552) 225 (1552) 225 (1552) 225 (1552)
263.4 x 83.4 x 92.5
(6690 x 2118 x 2350)
80 x 243
(2032 x
6172)
8357
(35.4)
12680
(49.7)
16 - 10
(406 - 3048)
80 x 243
(2032 x
6172)
263.4 x 83.4 x 92.5
(6690 x 2118 x 2350)
80 x 243
(2032 x
6172)
8357
(35.4)
12680
(49.7)
18 - 10
(457 - 3048)
80 x 243
(2032 x
6172)
263.4 x 83.4 x 92.5
(6690 x 2118 x 2350)
80 x 243
(2032 x
6172)
8357
(35.4)
138908
(54.7)
20 - 10
(508 - 3048)
(12.5)
80 x 243
(2032 x
6172)
Table 24, ALS 205-235
ALS MODEL NUMBER
DATA 205A 220a 235A
Unit capacity @ ARI conditions,
tons (kW)
Unit operating charge R-22, lbs (kg) 140 (63.5) 140 (63.5) 150 (68.1) 140 (63.5) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1)
Cabinet dimensions
L x W x H, in. (mm)
Unit operating weight, lbs. (kg) 15930 (7224) 15930 (7224) 15930 (7224)
Unit shipping weight, lbs. (kg) 15250 (6916) 15330 (6952) 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)
CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER
Coil face area, sq. ft. (m2) 115.6
Finned height x finned length, in.
(mm)
Fins per inch x rows deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of fans - fan diameter, in. (mm) 16 - 28 (711) 16 - 28 (711) 18 - 28 (711)
No. of motors - hp (kW) 16 - 1.5 (1.1) 16 - 1.5 (1.1) 18 - 1.5 (1.1)
Fan & motor rpm, 60/50Hz 1140/950 1140/950 1140/950
60 Hz fan tip speed, fpm
50 Hz fan tip speed, (m/sec)
60 Hz total unit airflow, cfm 144320 144320 162360
CKT.1 CKT.2 CKT.3 CKT.1 CKT.2 CKT.3 CKT.1 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)
(9017 x 2118 x 2400)
(10.7)
80 x 208
(2032 x
5283)
355 x 83.4 x 94.5
115.6
(10.7)
80 x 208
(2032 x
5283)
8357
(35.4)
115.6
(10.7)
160 x 104
(4064 x
2642)
80 x 208
355 x 83.4 x 94.5
(9017 x 2118 x 2400)
115.6
(10.7)
(2032 x
5283)
115.6
(10.7)
80 x 208
(2032 x
5283)
8357
(35.4)
115.6
(10.7)
160 x 104
(4064 x
2642)
(9017 x 2118 x 2400)
115.6
(10.7)
80 x 208
(2032 x
5283)
355 x 83.4 x 94.5
115.6
(10.7)
80 x 208
(2032 x
5283)
8357
(35.4)
115.6
(10.7)
160 x 104
(4064 x
2642)
28 IOMM ALS-1
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