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

2

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

Water Flow and Pressure Drop16

Physical Data......................... 18

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

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

General............................................................58

Compressor Maintenance ............................58

Lubrication .....................................................58

Electrical Terminals ........................................58

Condensers ....................................................58

Refrigerant Sightglass ..................................59

Lead-Lag.........................................................59

Preventative Maintenance Schedule ..........60

Service.................................. 61

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"

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

4

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

IOMM ALS

IOMM ALS

Figure 4, Suggested Lifting Method, ALS 300-340

Figure 5, Suggested Lifting method, ALS 360-425

5

6

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.

IOMM ALS

Clearance Requirements

Figure 6, Clearance Requirements, ALS 070-204

IOMM ALS

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.

7

Figure 7, Clearance Requirements, ALS 205-280

8

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

Figure 8, Clearance Requirements, ALS 300-425

IOMM ALS

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.

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

COLOR

OF

STRIPE

White

McQUAY PART

NUMBER

0047792932

RECOMMENDED

MAXIMUM LOAD

LBS. (KG)

2600 (1180) 125-280 CP2-32

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).

ALS

UNIT

SIZE

070

080

125A

140A

155A

170A

175A

185A

195A

204A

Table 2, Isolator Loads, ALS 070-204

1920

2071

1625

1680

1720

1760

1880

1880

1920

2081

1

(871)

(939)

(737)

(762)

(780)

(785)

(853)

(853)

(871)

(944)

N/A

N/A

2065

2145

2205

2220

2350

2350

2440

2644

2

ISOLATOR LOADS AT EACH MOUNTING LOCATION

LBS (KG)

3 4 5

N/A

N/A

(937)

(973)

(1000)

(1007)

(1066)

(1066)

(1107)

(1199)

1332

1437

1270

1350

1410

1425

1395

1395

1440

1560

(604( 1460

(652) 1575

(576) 1625

(612) 1680

(640) 1720

(647) 1730

(633) 1880

(633) 1880

(653) 1920

(707) 2081

(662)

(715)

(737)

(762)

(780)

(785)

(853)

(853)

(871)

(944)

N/A

N/A

2065

2145

2205

2220

2350

2350

2440

2644

N/A

N/A

(937)

(973)

(1000)

(1007)

(1066)

(1066)

(1107)

(1199)

Figure 9, Isolator Locations, ALS 070-204

1013

1092

1270

1350

1410

1425

1395

1395

1440

1560

6

(460)

(495)

(576)

(612)

(640)

(647)

(633)

(633)

(653)

(707)

Table 3, Isolator Loads, ALS 205-280

ALS

UNIT

SIZE

205A

220A

235A

250A

265A

280A

1

1790 (812)

1790

(812)

1820 (825)

1820 (825)

1820

(825)

1830 (830)

1840

1850

1880

1880

1880

1890

2

(834)

(839)

(853)

(853)

(853)

(857)

2040

2050

5080

2080

2080

2080

3

(925)

(930)

(943)

(943)

(943)

(943)

1370

1370

1370

1380

1380

1380

ISOLATOR LOADS AT EACH MOUNTING LOCATION

LBS (KG)

4 5 6 7

(621)

(621)

(621)

(626)

(626)

(626)

950

950

960

960

960

960

(431)

(431)

(435)

(435)

(435)

(435)

1630

1630

1670

1670

1670

1680

(739)

(739)

(757)

(757)

(757)

(762)

2020

2030

2060

2060

2060

2070

(916)

(921)

(934)

(934)

(934)

(939)

1640

1650

1680

1680

1680

1690

8

(744)

(748)

(762)

(762)

(762)

(766)

1650

1660

1660

1670

1670

1670

9

(748)

(753)

(753)

(757)

(757)

(757)

1000

1000

1000

1000

1000

1000

10

(454)

(454)

(454)

(454)

(454)

(454)

10

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 2 3

ISOLATOR LOADS AT EACH MOUNTING LOCATIONS, lb (kg)

4 5 6 7 8

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.

9 10

OPERATING

WEIGHT

LBS (KGS)

300A 1780 (807) 2060 (934) 2530 (1147) 2530 (1147) 2560 (1161) 2560 (1161) 2170 (984) 2170 (984) 1445 (655) 1445 (655) 21250

315A 1780 (807) 2060 (934) 2530 (1147) 2530 (1147) 2560 (1161) 2560 (1161) 2170 (984) 2170 (984) 1445 (655) 1445 (655) 21250

330A 1780 (807) 2060 (934) 2540 (1152) 2540 (1152) 2570 (1166) 2570 (1166) 2180 (989) 2180 (989) 1450 (658) 1450 (658) 21320

340A 1780 (807) 2060 (934) 2540 (1152) 2540 (1152) 2570 (1166) 2570 (1166) 2180 (989) 2180 (989) 1450 (658) 1450 (658) 21320

(9637)

(9637)

(9669)

(9669)

Figure 12, Vibration Isolators, ALS 300-340

Table 5, Vibration Isolators (Springs)

ALS UNIT SIZE TYPE

COLOR

OF

STRIPE

MCQUAY PART

NUMBER

047792932

RECOMMENDED

MAXIMUM LOAD

LB (KG)

300A-340A CP2-32 White 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 ISOLATOR LOAD AT EACH MOUNTING LOCATIONS, lb (kg) .

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.

IOMM ALS

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

12

Table 7, Vibration Isolators (Spring)

ALS UNIT SIZE TYPE

COLOR

OF

STRIPE

White

MCQUAY PART

NUMBER

047792932

RECOMMENDED

MAXIMUM LOAD

LBS (KG)

3000 (1360) 360A CP2-32

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.

IOMM ALS

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.

13

14

Figure 14, Typical Field Water Piping

Vent

Drain

Outlet

Valved pressure gauge

Vibration

Eliminator

Flow

Switch

Balancing valve

Gate valve

Protect all field piping against freezing

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

Flow direction marked on switch

1" (25mm) NPT flow switch connection

Table 8, Switch Minimum Flow Rates

NOMINAL PIPE SIZE

INCHES (MM)

5 (127)

6 (152)

8 (203)

MINIMUM REQUIRED FLOW TO

ACTIVATE SWITCH - GPM (LPS)

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

1 1/4" (32mm) dia.

Min. before switch

IOMM ALS

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

=

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

FREEZE

PT.

o

F o

C

26

19

9

-5

-27

-3

-7

-13

-21

-33

CAP

0.987

0.975

0.962

0.946

0.965

POWER

0.992

0.985

0.978

0.971

0.965

FLOW

1.010

1.028

1.050

1.078

1.116

PD

1.068

1.147

1.248

1.366

1.481

Table 10, Ethylene Glycol

%

E.G.

10

20

30

40

50

FREEZE

PT.

o

F o

C

26

18

7

-7

-28

-3

-8

-14

-22

-33

CAP

0.991

0.982

0.972

0.961

0.946

POWER

0.996

0.992

0.986

0.976

0.966

FLOW

1.013

1.040

1.074

1.121

1.178

PD

1.070

1.129

1.181

1.263

1.308

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 MAX FLOW RATE ALS UNIT

SIZE

070

080

090

100

MIN. FLOW

RATE

GPM LPS

102

122

139

147

6.5

7.7

8.8

9.3

GPM

272

324

369

391

LPS

17.2

20.5

23.4

24.8

SIZE

220

235

250

265

Figure 16, ALS 070 - 100, Evaporator Pressure Drop

MIN. FLOW

RATE

GPM LPS

335

356

376

391

21.2

22.5

23.8

24.7

MAX. FLOW

RATE

GPM LPS

893

950

1000

1043

56.4

60.0

63.2

66.0

16

IOMM ALS

Table 12, ALS 125 - 425, Min/Max Flow Rates

ALS UNIT MAX FLOW RATE ALS UNIT

SIZE

125

140

155

170

175

185

195

204

205

MIN. FLOW

RATE

GPM LPS

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

GPM

497

557

617

675

683

730

767

808

825

LPS

31.4

35.2

39.0

42.7

43.2

46.1

48.5

51.0

52.1

SIZE

280

300

315

330

340

360

370

380

425

MIN. FLOW

RATE

GPM LPS

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

MAX. FLOW

RATE

GPM LPS

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

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)

68.1 (239)

150 (68)

124.7 X 83.4 X 92.5

(3167 X 2118 X 2350)

5725 (2597)

5500 (2495)

77.9 (274)

160 (73)

124.7 X 83.4 X 92.5

(3167 X 2118 X 2350)

6175 (2801)

5900 (2676)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal tons, (kW0 65 (230) 80(280)

CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER

Coil face area, sq. ft. (m

2

) 115.6 (10.7) 115.6 (10.7)

Finned height x finned length, in.

(mm)

Fins per inch x rows deep

160 x 104

(4064 x 2642)

16 x 3

161 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

6-28 (711)

6-1.5 (1.1)

1140

8357

54120

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)

12-08

(305-2439)

24.3 (92.0)

175 (1207)

225 (1552)

6-28 (711)

6-1.5 (1.1)

1140

8357

54120

14008

(356-2439)

32.6 (123.4)

175 (1207)

225 (1552)

090A

90.6 (319)

180 (82)

159.4 X 83.4 X 92.5

(4049 X 2118 X 2350)

6825 (3096)

6500 (2948)

95 (335)

154.1 (14.3)

160 x 138.7)

4064 x 3523)

16 x 3

8-28 (711)

6-1.5 (1.1)

1140

8357

72160

14-10

(356-3048)

41.3 (156.3)

175 (1207)

225 (1552)

Table 14, ALS 125-170

ALS MODEL NUMBER

DATA 125A 140A

CKT.1

CKT.2

CKT.1

CKT.2

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)

62.2 (218) 62.2 (218)

140 (63.5) 140 (63.5)

228.7 x 83.4 x 92.5

(5809 x 2118 x 2350)

9920 (4500)

9600 (4355)

64.4 (226) 75 (263)

140 (63.5) 150 (68.1)

228.7 x 83.4 x 92.5

(5809 x 2118 x 2350)

10350 (4700)

9900 (4450)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal tons, (kW0 65 (230) 65 (230) 65 (230) 80 (280)

CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER

Coil face area, sq. ft. (m

2

)

Finned height x finned length, in.

(mm)

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)

CKT.1

77.1 (271)

150 (68.1)

228.7 x 83.4 x 92.5

(5809 x 2118 x 2350)

10670 (4840)

10250 (4650)

80 (280)

115.6 (10.7)

80 x 208

(2032 x 5283)

155A

CKT.2

77.1 (271)

150 (68.1)

80 (280)

115.6 (10.7)

80 x 208

(2032 x 5283)

Fins per inch x rows deep 16 x 3

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

16 x 3

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)

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE

Shell diameter - tube length 14 - 10

16 x 3

16 - 10

16 x 3

10 - 28 (711)

10 - 1.5 (1.1)

1140/950

8357

(35.4)

90200

(35.5)

16 x 3 16 x 3

12 - 28 (711)

12 - 1.5 (1.1)

1140/950

8357

(35.4)

108240

(42.6)

16 - 10

96.4 (339)

190 (87)

159.4 X 83.4 X 92.5

(4049 X 2118 X 2350)

7300 (3311)

6900 (3130)

95 (335)

154.1 (14.3)

160 x 138.7)

4064 x 3523)

16 x 3

8-28 (711)

6-1.5 (1.1)

1140

8357

16-10

(407-3048)

43.6 (165)

175 (1207)

225 (1552)

CKT.1

170A

CKT.2

79 (278)

150 (68.1) 160 (72.6)

228.7 x 83.4 x 92.5

(5809 x 2118 x 2350)

10750 (4880)

10350 (4700)

80 (280)

100A

72160

12 - 28 (711)

12 - 1.5 (1.1)

1140/950

8357

(35.4)

108240

(42.6)

16 - 10

89.7 (315)

95 (335)

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

18

IOMM ALS

in (mm) - ft. (mm)

Water volume, gallons (L)

Max. water pressure, psi (kPa)

Max. refrigerant pressure, psi (kPa)

(356 - 3048)

36.1 (136.7)

175 (1207)

225 (1552)

(406 - 3048)

45.6 (172.6)

175 (1207)

225 (1552)

(406 - 3048)

45.6 (172.6)

175 (1207)

225 (1552)

Table 15, ALS 175-204

ALS MODEL NUMBER

DATA 175A 185A

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

80.4 (282)

160 (72.6)

CKT.2

90.6 (318)

160 (72.6)

263.4 x 83.4 x 92.5

(6690 x 2118 x 2350)

11250 (5100)

10850 (4920)

CKT.1

91.2 (320)

160 (72.6)

CKT.2

91.2 (320)

160 (72.6)

263.4 x 83.4 x 92.5

(6690 x 2118 x 2350)

11250 (5100)

10850 (4920)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal tons, (kW) 80 (280) 95 (335) 95 (335) 95 (335)

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)

CKT.1

94.6 (332)

170 (77.1)

95 (335)

135.0 (12.5)

195A

CKT.2

94.6 (332)

170 (77.1)

263.4 x 83.4 x 92.5

(6690 x 2118 x 2350)

11500 (5218)

11100 (5036)

95 (335)

135.0 (12.5)

(406 - 3048)

45.6 (172.6)

175 (1207)

225 (1552)

CKT.1

101 (355)

204A

CKT.2

101 (355)

195 (88.4)

263.4 x 83.4 x 92.5

(6690 x 2118 x 2350)

12570 (5701)

11980 (5433)

95 (335)

195 (88.4)

95 (335)

Finned height x finned length, in.

(mm)

Fins per inch x rows deep

80 x 243

(2032 x

6172)

16 x 3

80 x 243

(2032 x 6172)

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

14 - 28 (711)

14 - 1.5 (1.1)

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

8357

(35.4)

126280

(49.7)

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)

80 x 243

(2032 x

6172)

16 x 3

14 - 28 (711)

14 - 1.5 (1.1)

1140/950

8357

(35.4)

12680

(49.7)

16 - 10

80 x 243

(2032 x

6172)

16 x 3

(406 - 3048)

43.6 (165.0)

175 (1207)

225 (1552)

80 x 243

(2032 x

6172)

16 x 3

80 x 243

(2032 x

6172)

16 x 3

14 - 28 (711)

14 - 1.5 (1.1)

1140/950

8357

(35.4)

12680

(49.7)

18 - 10

(457 - 3048)

57.3 (216.9)

175 (1207)

225 (1552)

Table 16, ALS 205-235

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

64.4 (226)

140 (63.5)

COMPRESSORS, SCREW, SEMI-HERMETIC

205A

CKT.2

66.1 (232)

CKT.3

75.8 (266)

140 (63.5)

355 x 83.4 x 94.5

150 (68.1)

(9017 x 2118 x 2400)

15930 (7224)

15250 (6916)

CKT.1

ALS MODEL NUMBER

66.1 (232)

140 (63.5)

Nominal tons, (kW0 65 (230) 65 (230) 80 (280) 65 (230)

CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER

Coil face area, sq. ft. (m

2

) 115.6

(10.7)

115.6

(10.7)

115.6

(10.7)

115.6

(10.7)

Finned height x finned length, in.

(mm)

80 x 208

(2032 x

5283)

80 x 208

(2032 x

5283)

160 x 104

(4064 x

2642)

80 x 208

(2032 x

5283)

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) 16 - 28 (711)

No. of motors - hp (kW)

Fan & motor rpm, 60/50Hz

60 Hz fan tip speed, fpm

50 Hz fan tip speed, (m/sec)

16 - 1.5 (1.1)

1140/950

8357

(35.4)

220a

CKT.2

78.2 (275)

CKT.3

79.0 (277)

150 (68.1)

355 x 83.4 x 94.5

150 (68.1)

(9017 x 2118 x 2400)

15930 (7224)

15330 (6952)

80 (280)

115.6

(10.7)

80 x 208

(2032 x

5283)

16 x 3

16 - 28 (711)

16 - 1.5 (1.1)

1140/950

8357

(35.4)

80 (280)

115.6

(10.7)

160 x 104

(4064 x

2642)

16 x 3

CKT.1

79.3 (279)

80 (280)

115.6

(10.7)

80 x 208

(2032 x

5283)

16 x 3

135.0 (12.5)

80 x 243

(2032 x

6172)

12 x 4

14 - 28 (711)

235A

CKT.2

79.3 (279)

115.6

(10.7)

80 x 208

(2032 x

5283)

16 x 3

14 - 2.0 (1.5)

1140/950

8357

(35.4)

138908

(54.7)

20 - 10

(508 - 3048)

69.6 (263.5)

175 (1207)

225 (1552)

CKT.3

79.0 (277)

150 (68.1) 150 (68.1)

355 x 83.4 x 94.5

150 (68.1)

(9017 x 2118 x 2400)

15930 (7224)

15330 (6952)

80 (280)

18 - 28 (711)

18 - 1.5 (1.1)

1140/950

8357

(35.4)

135.0

(12.5)

80 x 243

(2032 x

6172)

12 x 4

80 (280)

115.6

(10.7)

160 x 104

(4064 x

2642)

16 x 3

IOMM ALS

19

60 Hz total unit airflow, cfm

50 Hz total unit airflow, (m2/sec

144320

(56.8)

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)

144320

(56.8)

20 - 10

(508 - 3048)

76 (287.7)

175 (1207)

225 (1552)

162360

(63.9)

20 - 10

(508 - 3048)

76 (287.7)

175 (1207)

225 (1552)

Table 17, ALS 250-280

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

80.2 (282)

250A

CKT.2

79.0 (277)

CKT.3

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)

CKT.1

ALS MODEL NUMBER

80.2 (282)

265A

CKT.2

89.7 (315)

CKT.3

91 (320)

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)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal tons, (kW0 80 (280) 80 (280) 95 (335) 80 (280)

CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER

Coil face area, sq. ft. (m

2

) 115.6

115.6

115.6

115.6

(10.7) (10.7) (10.7) (10.7)

Finned height x finned length, in.

(mm)

Fins per inch x rows deep

80 x 208

(2032 x

5283)

16 x 3

80 x 208

(2032 x

5283)

16 x 3

160 x 104

(4064 x

5283)

16 x 3

80 x 208

(2032 x

5283)

16 x 3

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

95 (335)

115.6

(10.7)

80 x 208

(2032 x

5283)

16 x 3

95 (335)

115.6

(10.7)

160 x 104

(4064 x

5283)

16 x 3

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)

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)

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)

Table 18, ALS 300-340

ALS MODEL NUMBER

CKT.1

91.4 (321)

280A

CKT.2

89.7 (315)

CKT.3

91 (320)

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)

95 (335)

115.6

(10.7)

80 x 208

(2032 x

5283)

16 x 3

95 (335)

115.6

(10.7)

80 x 208

(2032 x

5283)

16 x 3

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)

95 (335)

115.6

(10.7)

160 x 104

(4064 x

5283)

16 x 3

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

(235)

155

(70.3)

66.9

(235)

155

(70.3)

79.7

(280)

160

(72.6)

389.7 x 83.4 x 94.5

(9898 x 2118 x 2400)

79.7

(280)

160

(72.6)

21250 (9637)

20300 (9206)

66.9

(235)

155

(70.3)

79.7

(280)

160

(72.6)

79.7

(280)

160

(72.6)

389.7 x 83.4 x 94.5

(9898 x 2118 x 2400)

21250 (9637)

20300 (9206)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal tons, (kW0 65

(230)

65

(230)

80

(280)

80

(280)

65

(230)

80

(280)

80

(280)

CONDENSERS, HIGH EFFICIENCY FIN & TUBE TYPE WITH INTEGRAL SUBCOOLER

Coil face area, sq. ft. (m

2

) 96.3

(8.9)

96.3

(8.9)

96.3

(8.9)

96.3

(8.9)

96.3

(8.9)

96.3

(8.9)

96.3

(8.9)

Finned height x finned length, in. (mm) 80 x

173

(2032 x

80 x

173

(2032 x

80 x

173

(2032 x

80 x

173

(2032 x

80 x

173

(2032 x

80 x

173

(2032 x

80 x

173

(2032 x

79.7

(280)

160

(72.6)

80

(280)

96.3

(8.9)

80 x

173

(2032 x

79.2

(278)

160

(72.6)

80

(280)

96.3

(8.9)

80 x

173

(2032 x

79.7

(280)

160

(72.6)

80

(280)

96.3

(8.9)

80 x

173

(2032 x

80.3

(282)

160

(72.6)

389.7 x 83.4 x 94.5

(9898 x 2118 x 2400)

21320 (9669)

20400 (9252)

80

(280)

96.3

(8.9)

80 x

173

(2032 x

80.3

(282)

160

(72.6)

80

(280)

96.3

(8.9)

80 x

173

(2032 x

79.2

(278)

160

(72.6)

80 x

79.7

(280)

160

(72.6)

80.3

(282)

160

(72.6)

389.7 x 83.4 x 94.5

(9898 x 2118 x 2400)

(280)

96.3

(8.9)

80 x

173

(2032

21320 (9669)

20400 (9252)

80

(280)

96.3

(8.9)

80 x

173

(2032 x

80

(280)

96.3

(8.9)

80 x

173

(2032 x

89.4

(314)

170

(77.1)

95

(335)

96.3

(8.9)

80 x

173

(2032 x

20

IOMM ALS

Fins per inch x rows deep

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

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)

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE

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)

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)

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)

Table 19, ALS 360-425

DATA

ALS MODEL NUMBER

360A 370A 380A 425A

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

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

(284)

175

(79.4)

80.9

(284)

175

(79.4)

93.4

(328)

180

(81.6)

459 x 83.4 x 94.5

(11659 x 2118 x 2400)

22920 (10395)

93.4

(328)

180

(81.6)

22000 (9977)

80.9

(284)

175

(79.4)

91.8

(323)

180

(81.6)

93.4

(328)

180

(81.6)

459 x 83.4 x 94.5

(11659 x 2118 x 2400)

22970 (10417)

93.4

(328)

180

(81.6)

22050 (10000)

92.3

(325)

180

(81.6)

92.3

(325)

180

(81.6)

93.4

(328)

180

(81.6)

459 x 83.4 x 94.5

(11659 x 2118 x 2400)

23020 (10440)

93.4

(328)

180

(81.6)

22100 (10023)

100.3

(353)

190

(86.2)

100.3

(353)

190

(86.2)

100.3

(353)

190

(86.2)

459 x 83.4 x 94.5

(11659 x 2118 x 2400)

23813 (10800)

100.3

(353)

190

(86.2)

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

)

Finned height x finned length, in. (mm)

Fins per inch x rows deep

115.6

(10.7)

80 x

208

115.6

(10.7)

80 x

208

(2032 x

5283)

(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)

115.6

(10.7)

80 x

208

(2032 x

5283)

115.6

(10.7)

115.6

(10.7)

80 x

208

80 x

208

(2032 x

5283)

(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)

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)

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

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

No. of fans - fan dia., in. (mm) 24 - 28 (711)

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 - 2.0 (1.5)

1140/950

8357

(35.4)

238128

(112.4)

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL & THRU TUBE

Shell diameter - tube length in (mm) - ft. (mm)

Water volume, gallons (L)

24 - 10

((609 - 3048)

107 (405.0)

Max. water pressure, psi (kPa)

Max. refrigerant pressure, psi

(kPa)

175 (1207)

225 (1552)

24 - 28 (711)

24 - 2.0 (1.5)

1140/950

8357

(35.4)

238128

(112.4)

24 - 10

((609 - 3048)

107 (405.0)

175 (1207)

225 (1552)

24 - 28 (711)

24 - 2.0 (1.5)

1140/950

8357

(35.4)

238128

(112.4)

24 - 10

((609 - 3048)

107 (405.0)

175 (1207)

225 (1552)

24 - 28 (711)

24 - 2.5 (1.9)

1140/950

8357

(35.4)

257180

(121.4)

24 - 12

(609 - 3658)

129 (488)

175 (1207)

225 (1552)

Major Components

Table 20, ALS 070-425

UNIT SIZE COMPRESSOR

IDENTIFICATION

070

080

090

100

125A

140A

155

167

175

175

155

155

155

167 -

-

IOMM ALS

-

-

EVAPORATOR

VESSEL SIZE

1208-1

1408-1

1410-1

1610-1

1410-1

1610-1

100

140

170

170

100

140

ELECTRONIC EXPANSION

VALVE SIZE

100

140

-

-

-

CONTACTOR DESIGNATION

FOR COMPRESSOR

M1-M5

M1-M5

M1-M5

M1-M5

M1-M5

M1-M5

M2-M6

M2-M6

-

21

250A

265A

280A

300A

315A

330A

340A

360A

155A

170A

175A

185A

195A

204A

205A

220A

235A

370A

380A

425A

167

167

175

155

155

167

167

167

167

167

167

175

175

175

155

155

167

167

175

175

167

175

175

167

167

167

167

175

-

-

167

167

167

-

-

-

-

175

175

175

167

175

175

155

167

167

167

167

167

175

175

175

175

175

155

167

167

175

175

175

167

167

167

175

175

-

-

-

175

175

175

-

-

-

-

-

-

-

-

-

2010-1

2010-1

2010-1

2410-2

2410-2

2410-1

2410-1

2410-1

1610-1

1610-1

1610-1

1610-1

1810-1

2010-1

2010-3

2010-2

2010-2

2410-1

2410-1

2412-1

140

170

170

140

140

140

140

140

140

170

170

170

170

170

140

140

140

170

170

170

140

170

170

140

140

140

170

170

-

-

140

140

140

-

-

-

-

170

170

170

140

170

170

140

140

140

140

140

140

170

170

170

170

170

140

140

140

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

22

IOMM ALS

Compressor Staging

ALS 125-204 (Does not apply to ALS 070-100)

Table 21, Two Compressors Available

STAGE UP

7

8

5

6

1

2

3

4

LEAD

COMPRESSOR

-

50%

75%

50%

75%

75%

100%

100%

LAG 1

COMPRESSOR

-

0%

0%

50%

50%

75%

75%

100%

UNIT

CAPACITY

0%

25.0%

37.5%

50.0%

62.5%

75.0%

87.5%

100.0%

Table 22, One Compressor Available

STAGE UP

1

2

3

4

LEAD

COMPRESSOR

-

50%

75%

50%

LAG 1

COMPRESSOR

-

0%

0%

0%

UNIT

CAPACITY

0%

25.0%

37.5%

50.0%

STAGE Down

7

8

5

6

1

2

3

4

LEAD

COMPRESSOR

25%

50%

75%

50%

75%

75%

100%

100%

LAG 1

COMPRESSOR

0%

0%

0%

50%

50%

75%

75%

100%

UNIT

CAPACITY

12.5%

25.0%

37.5%

50.0%

62.5%

75.0%

87.5%

100.0%

STAGE Down

1

2

3

4

LEAD

COMPRESSOR

25%

50%

75%

100%

LAG 1

COMPRESSOR

0%

0%

0%

0%

UNIT

CAPACITY

12.5%

25.0%

37.5%

50.0%

ALS 205-280

Table 23, Three Compressors Available

STAGE

UP

1

2

8

9

10

5

6

3

4

7

11

12

LEAD

COMP.

-

50%

75%

50%

75%

75%

75%

75%

75%

100%

100%

100%

LAG 1

COMP.

-

0%

0%

50%

50%

75%

50%

75%

75%

75%

100%

100%

LAG 2

COMP.

-

0%

0%

0%

0%

0%

50%

50%

75%

75%

75%

100%

Table 24, Two compressors available

STAGE

UP

4

5

6

7

8

1

2

3

LEAD

COMP.

-

50%

75%

50%

75%

75%

100%

100%

LAG 1

COMP.

-

0%

0%

50%

50%

75%

75%

100%

LAG 2

COMP.

-

0%

0%

0%

0%

0%

0%

0%

Table 25, One Compressor Available

STAGE

UP

1

2

3

4

LEAD

COMP.

-

50%

75%

100%

LAG 1

COMP.

-

0%

0%

0%

LAG 2

COMP.

-

0%

0%

0%

UNIT

CAPACITY

0%

16.7%

25.0%

33.3%

41.7%

50.0%

58.3%

66.7%

75.0%

83.3%

91.6%

100.0%

UNIT

CAPACITY

0%

16.7%

25.0%

33.3%

41.7%

50.0%

58.3%

66.7%

UNIT

CAPACITY

0%

16.7%

25.0%

33.3%

STAGE

DOWN

1

2

8

9

10

5

6

3

4

7

11

12

LEAD

COMP.

25%

50%

75%

50%

75%

50%

75%

75%

75%

100%

100%

100%

STAGE

DOWN

4

5

6

7

8

1

2

3

LEAD

COMP.

25%

50%

75%

50%

75%

75%

100%

100%

STAGE

DOWN

1

2

3

4

LEAD

COMP.

25%

50%

75%

100%

LAG 1

COMP.

0%

0%

0%

50%

50%

75%

75%

100%

LAG 1

COMP.

0%

0%

0%

50%

50%

50%

50%

75%

75%

75%

100%

100%

LAG 1

COMP.

0%

0%

0%

0%

LAG 2

COMP.

0%

0%

0%

0%

0%

50%

50%

50%

75%

75%

75%

100%

UNIT

CAPACITY

8.3%

16.7%

25.0%

33.3%

41.7%

50.0%

58.3%

66.7%

75.0%

83.3%

91.6%

100.0%

LAG 2

COMP.

0%

0%

0%

0%

0%

0%

0%

0%

UNIT

CAPACITY

8.3%

16.7%

25.0%

33.3%

41.7%

50.0%

58.3%

66.7%

LAG 2

COMP.

0%

0%

0%

0%

UNIT

CAPACITY

8.3%

16.7%

25.0%

33.3%

IOMM ALS

23

ALS 300-425

Table 26, Four Compressors Available

STAGE

UP

12

13

14

7

8

9

10

11

15

16

4

5

6

1

2

3

LEAD

COMP.

75%

75%

75%

75%

75%

75%

100%

100%

100%

100%

-

50%

75%

50%

75%

75%

LAG 1

COMP.

50%

75%

75%

75%

75%

75%

75%

100%

100%

100%

-

0%

0%

50%

50%

75%

LAG 2

COMP.

50%

50%

75%

50%

75%

75%

75%

75%

100%

100%

-

0%

0%

0%

0%

0%

LAG 3

COMP.

0%

0%

0%

50%

50%

75%

75%

75%

75%

100%

-

0%

0%

0%

0%

0%

Table 27,Three Compressors Available

STAG

E

1

2

8

9

6

7

10

3

4

5

11

12

LEAD

COMPRESS

OR

-

50%

75%

50%

75%

75%

75%

75%

75%

100%

100%

100%

LAG 1

COMPRESS

OR

-

0%

0%

50%

50%

75%

50%

75%

75%

75%

100%

100%

LAG 2

COMPRESS

OR

-

0%

0%

0%

0%

0%

50%

50%

75%

75%

75%

100%

LAG 3

COMPRESS

OR

-

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%

56.3%

62.5%

68.8%

75.0%

81.3%

87.5%

93.8%

100.0%

UNIT

CAPACITY

0.0%

12.5%

18.8%

25.0%

31.3%

37.5%

43.8%

50.0%

56.3%

62.5%

68.8%

75.0%

STAGE

DOWN

12

13

14

7

8

9

10

11

15

16

4

5

6

1

2

3

LEAD

COMP.

75%

50%

75%

75%

75%

75%

100%

100%

100%

100%

25%

50%

75%

50%

75%

50%

LEAD

COMPRESS

OR

25%

50%

75%

50%

75%

50%

75%

75%

75%

100%

100%

100%

LAG 1

COMPRESS

OR

0%

0%

0%

50%

50%

50%

50%

75%

75%

75%

100%

100%

LAG 1

COMP.

50%

50%

50%

75%

75%

75%

75%

100%

100%

100%

0%

0%

0%

50%

50%

50%

LAG 2

COMP.

50%

50%

50%

50%

75%

75%

75%

75%

100%

100%

0%

0%

0%

0%

0%

50%

LAG 2

COMPRESS

OR

0%

0%

0%

0%

0%

50%

50%

50%

75%

75%

75%

100%

LAG 3

COMPRESS

OR

0%

0%

0%

0%

0%

0%

0%

0%

0%

0%

0%

0%

LAG 3

COMP.

0%

50%

50%

50%

50%

75%

75%

75%

75%

100%

0%

0%

0%

0%

0%

0%

Table 28, Two Compressors Available

6

7

8

3

4

1

2

5

STAGE

LEAD

COMPRESSO

R

-

50%

75%

50%

75%

75%

100%

100%

LAG 1

COMPRESSO

R

-

0%

0%

50%

50%

75%

75%

100%

LAG 2

COMPRESSO

R

-

0%

0%

0%

0%

0%

0%

0%

LAG 3

COMPRESSO

R

-

0%

0%

0%

0%

0%

0%

0%

Table 29, One Compressors Available

STAGE

1

2

3

4

LEAD

COMPRESSO

R

-

50%

75%

100%

LAG 1

COMPRESSO

R

-

0%

0%

0%

LAG 2

COMPRESSO

R

-

0%

0%

0%

LAG 3

COMPRESSO

R

-

0%

0%

0%

UNIT

CAPACITY

0.0%

12.5%

18.8%

25.0%

31.3%

37.5%

43.8%

50.0%

LEAD

COMPRESSO

R

25%

50%

75%

50%

75%

75%

100%

100%

LAG 1

COMPRESSO

R

0%

0%

0%

50%

50%

75%

75%

100%

LAG 2

COMPRESSO

R

0%

0%

0%

0%

0%

0%

0%

0%

LAG 3

COMPRESSO

R

0%

0%

0%

0%

0%

0%

0%

0%

UNIT

CAPACITY

0.0%

12.5%

18.8%

25.0%

LEAD

COMPRESSO

R

25%

50%

75%

100%

LAG 1

COMPRESSO

R

0%

0%

0%

0%

LAG 2

COMPRESSO

R

0%

0%

0%

0%

LAG 3

COMPRESSO

R

0%

0%

0%

0%

UNIT

CAPACITY

UNIT

CAPACITY

6.3%

12.5%

18.8%

25.0%

31.3%

37.5%

43.8%

50.0%

UNIT

CAPACITY

6.3%

12.5%

18.8%

25.0%

6.3%

12.5%

18.8%

25.0%

31.3%

37.5%

43.8%

50.0%

56.3%

62.5%

68.8%

75.0%

UNIT

CAPACITY

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%

24

IOMM ALS

Dimensional Data

Figure 18, ALS 070A-100A

ALS

UNIt

SIZE

LENGTH

A B o

070A

080A

090A

100A

ALS

UNIT

SIZE

070A

080A

090A

100A

124.7(3167)

124.7(3167

159.4(4049)

159.4(4049)

COMPRESSOR

Q t y .

1

1

1

1

93.7(2380)

93.7(2380)

128.4(3261)

128.4(3261)

Nom. Tons

65

80

95

95

Q t y .

6

6

8

8

9.9(252)

9.9(252)

20.6(524)

20.6(524)

FANS

H.P.

1.5

1.5

1.5

1.5

EVAPORATOR

C D E

15.0(381)

15.0(381)

15.0(381)

15.0(381)

15.9(404)

19.5(495)

19.5(495)

19.5(495)

REFRIGERANT

CHARGE lb (kg)

System #1

150(68)

160(73)

180(82)

190(87)

CENTER OF GRAVITY

X

52.9(1344)

52.9(1344)

64.9(1649)

64.9(1649)

Y

39.0(991)

39.0(991)

39.0(991)

39.0(991)

UNIT WEIGHTS lb (kg)

OPERATING SHIPPING

5725(2597)

6175(2801)

6825(3096)

7300(3311)

5500(2495)

5900(2676)

6500(2948)

6900(3130)

COPPER

FIN ADD

850(387)

850(387)

1150(523)

1150(523)

LIFTING HOLES

L1

18.6(473)

18.6(473)

18.6(473)

18.6(473)

L2

107.9(2740)

107.9(2740)

131.9(3350)

131.9(3350)

S1

13.0(330)

13.0(330)

13.0(330)

13.0(330)

ISOLATOR MOUNTING

S2

N/A

N/A

95.0(2416)

95.0(2416)

S3

110.4(2805)

110.4(2805)

146.9(3731)

146.9(3731)

IOMM ALS

25

Figure 19, ALS 125A-204A

ALS

UNIT

SIZE

125A

140A

155A

170A

175A

185A

195A

204A

170A

175A

185A

195A

204A

ALS

UNIT

SIZE

LENGTH

125A

140A

155A

A

228.7

(5809)

228.7

(5809)

228.7

(5809)

228.7

(5809)

263.4

(6690)

263.4

(6690)

263.4

(6690)

263.4

(6690)

EVAPORATOR

B

117.6 (2987)

118.5 (3010)

118.5 (3010)

118.5 (3010)

153.2 (3891)

153.2 (3891)

153.2 (3891)

152.2 (3866)

C

13.8 (351)

12.9 (328)

12.9 (328)

12.9 (328)

47.6

(1209)

47.6

(1209)

47.6

(1209)

48.5

(1232)

D E

28.7 (729) 19.4 (493)

28.7 (729) 19.4 (493)

28.7 (729) 19.4 (493)

28.7 (729) 19.4 (493)

28.7 (729) 19.4 (493)

28.7 (729) 19.4 (493)

27.3 (693) 20.4 (518)

25.7 (653) 20.2 (513)

CENTER OF GRAVITY

X

104.3 (2649)

104.3 (2649)

105.2 (2672)

105.2 (2672)

113.1 (2873)

113.1 (2873)

115.2 (2926)

116.5 (2959)

Y

41.7 (1059)

41.7 (1059)

41.7 (1059)

41.7 (1059)

41.7 (1059)

41.7 (1059)

41.7 (1059)

41.7 (1059)

UNIT WEIGHTS lb (kg)

STANDARD UNIT ADD’L WT.

OPERATING SHIPPING

9920 (4500) 9600 (4355)

FOR COPPER

FINS

1652 (750)

10350 (4700)

10670 (4840)

9900 (4355)

10250 (4650)

1652 (750)

1652 (750)

10750 (4880)

11250 (5100)

11250 (5100)

11500 (5218)

12570 (5701)

10350 (4700)

10850 (4920)

10850 (4920)

11100 (5036)

11980 (5433)

1652 (750)

1930 (876)

1930 (876)

1930 (876)

2025 (918)

COMPRESSOR

QTY.

2

2

2

2

2

2

2

2

NOM. TONS

65/65

65/80

80/80

80/95

80/95

95/95

95/95

95/95

QTY.

14

14

14

14

10

10

12

12

FANS

H.P.

1.5

1.5

1.5

2.0

1.5

1.5

1.5

1.5

OPERATING REFRIGERANT

CHARGE (R-22) lb (kg))

SYSTEM #1 SYSTEM #2

140 (63.5)

140 (63.5)

150 (68.1)

150 (68.1)

160 (72.6)

160 (72.6)

170 (77.1)

195 (88.5)

140 (63.5)

150 (68.1)

150 (68.1)

160 (72.6)

160 (72.6)

160 (72.6)

170 (77.1)

195 (88.5)

26

IOMM ALS

Figure 20, ALS 205A-280A

ALS

UNIT

CENTER OF GRAVITY UNIT WEIGHTS lb (kg) ADD’L WEIGHT

FOR COPPER

SIZE X Y OPERATING SHIPPING FIN COILS

205A 146.7 3,726 41.7

1,059 15,930 7,224 15,250 6,916 2,478 1,124

220A 146.7 3,726 41.7

1,059 15,980 7,247 15,330 6,952 2,478 1,124

235A 146.7 3,726 41.7

1,059 16,180 7,338 15,630 7,043 2,478 1,124

250A 146.7 3,726 41.7

1,059 16,200 7,347 15,530 7,075 2,478 1,124

265A 146.7 3,726 41.7

1,059 16,200 7,347 15,600 7,075 2,478 1,124

280A 146.7 3,726 41.7

1,059 16,250 7,370 15,650 7,098 2,478 1,124

COMPRESORS

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

FANS OPERATING REFREGERANT

CHARGE (R-22) lb (kg)

SYSTEM #1 SYSTEM #2 SYSTEM #3

1.5

140 63.5

140 63.5

150 68.1

1.5

140 63.5

150 68.1

150 68.1

1.5

150 68.1

150 68.1

150 68.1

1.5

150 68.1

150 68.1

160 72.6

1.5

150 68.1

160 72.6

160 72.6

1.5

160 72.6

160 72.6

160 72.6

IOMM ALS

27

Figure 21, ALS 300-340

ALS

UNIT

CENTER OF GRAVITY UNIT WEIGHTS lb (kg)

SIZE X Y OPERATING SHIPPING

300A 166.9

4239 41.7

1059 21,250 9637 20,300 9206

315A 166.9

4239 41.7

1059 21,250 9637 20,300 9206

330A 166.9

4239 41.7

1059 21,320 9669 20,400 9252

340A 166.9

4239 41.7

1059 21,230 9669 20,400 9252

ADD’L WEIGHT

FOR COPPER

FIN COILS

3,671

3,671

3,671

3,671

1665

1665

1665

1665

COMPRESSORS FANS REFRIGERANT CHARGE (R-22) lb (kg)

QTY NOM.TONS QTY HP SYST. #1 SYST. #2 SYST. #3 SYST. #4

4

4

4

4

65/65/80/80

65/80/80/80

80/80/80/80

80/80/80/95

20

20

20

20

2.0

155 70.3

155 70.3

160 72.6

160 72.6

2.0

155 70.3

160 72.6

160 72.6

160 72.6

2.0

160 72.6

160 72.6

160 72.6

160 72.6

2.0

160 72.6

160 72.6

160 72.6

170 77.1

28

IOMM ALS

Figure 22, ALS 360-425

ALS

UNIT

SIZE

CENTER OF GRAVITY

X Y

UNIT WEIGHTS lb (kg)

OPERATING SHIPPING

ADD’L WEIGHT

FOR COPPER

FIN COILS

360A 185.0 4699 41.7

1059 22,920 10395 22,000 9977 4,406

370A 185.0 4699 41.7

1059 22,970 10417 22,050 10000 4,406

380A 185.0 4699 41.7

1059 23,020 10440 22,100 10023 4,406

425A 192.4 4887 41.1

1044 23813 10800 22715 10302 4406

1998

1998

1998

1998

COMPRESSORS

NOM.

FANS REFRIGERANT CHARGE (R-22) lb (kg)

SYST. #1 SYST. #2 SYST. #3 SYST. #4

4 80/80/95/95 24 2.0

175 79.4

175 79.4

180 81.6

180 81.6

4 80/95/95/95 24 2.0

175 79.4

180 81.6

180 81.6

180 81.6

4 95/95/95/95 24 2.0

180 81.6

180 81.6

180 81.6

180 81.6

4 95/95/95/95 24 2.5

190 86.2

190 86.2

190 86.2

190 86.2

IOMM ALS

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

ALS

UNIT

SIZE

VOLTS HZ

070A

080A

090A

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

60

60

60

100A

208

230

380

460

60

575

(*) Table based on 75

°

C field wire per NEC

MINIMUM

CIRCUIT

AMPACITY

(MCA)

410

375

227

187

150

475

434

262

216

173

475

434

262

216

173

335

307

185

153

124

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

POWER SUPPLY

QTY.

FIELD WIRE

WIRE

GUAGE

QTY.

400

350

3/0

2/0

#1

600

500

4/0

3/0

1/0

350

300

300

4/0

2/0

350

300

300

4/0

2/0

2

2

1

1

1

1

1

1

1

1

1

1

2

2

1

1

1

1

1

1

HUB

NOMINAL

SIZE

3.0

2.5

2.0

1.5

1.5

3.0

3.0

2.0

1.5

1.5

2.5

2.5

2.5

2.0

1.5

2.5

2.5

2.5

2.0

1.5

FIELD FUSE SIZE

RECOM-

MENDED

500

400

250

200

175

500

500

300

250

200

600

600

350

300

225

600

600

350

300

225

MAXIMUM

700

600

350

300

250

800

700

450

350

250

800

700

450

350

250

500

500

300

250

200

IOMM ALS

31

Table 31, Single Point Connection, ALS 125-204

ALS

UNIT

SIZE

125A

140A

155A

170A

175A

185A

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

HZ

60

60

60

60

60

60

MINIMUM

CIRCUIT

AMPACITY

(MCA)

598

548

331

273

221

673

616

372

307

247

195A

208*

230

380

460

575

60

853*

779

471

388

311

208*

230

380

881*

799

481 60

204A 460 399

575 321

(*) Field wire size values apply to 90

°

C rated wire per NEC

799

730

441

364

292

745

682

412

340

273

810

741

448

369

296

853*

779

471

388

311

6

6

6

3

3

6

6

6

3

3

6

6

3

3

6

6

6

6

6

3

6

6

6

6

3

6

6

6

6

3

6

6

3

3

6

6

3

3

3

3

POWER SUPPLY

QTY.

FIELD WIRE

WIRE

GUAGE

QTY.

350

300

400

300

4/0

500

350

500

350

250

2

2

1

1

2

2

1

1

1

1

500

500

#4/0

500

300

600

500

#4/0

500

350

600

500

250

500

350

600*

600

250

#3/0

400

600*

600

250

#3/0

400

600*

600

250

#3/0

400

2

2

2

2

1

2

2

2

2

1

2

2

2

1

1

2

2

2

1

1

2

2

1

1

2

2

2

2

2

1

HUB

3.0

3.0

2.0

3.0

2.5

3.0

3.0

2.0

3.0

2.5

3.0

3.0

2.5

3.0

2.5

3.0

3.0

2.5

2.0

2.5

3.0

3.0

2.5

2.0

2.5

3.0

3.0

2.5

2.0

2.5

NOMINAL

SIZE

2.5

2.5

3.0

2.5

2.0

3.0

2.5

3.0

2.5

2.5

FIELD FUSE SIZE

800

800

500

400

300

1000

800

500

450

350

1000

1000

500

450

350

1000

1000

500

450

350

1000

1000

500

450

350

1000

1000

500

500

400

RECOM-

MENDED

700

600

400

300

250

800

700

450

400

300

MAXIMUM

1000

800

500

450

350

1000

1000

600

500

400

800

700

450

350

300

800

800

500

400

350

1000

1000

600

500

400

1000

1000

600

500

400

1000

1000

600

500

400

1200

1000

600

500

400

32

IOMM ALS

Table 32, Single Point Connection, ALS 205-425

ALS

UNIT

SIZE

205A

220A

235A

250A

265A

280A

300A

315A

330A

340A

360A

370A

VOLTS

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380*

460

575

380*

460

575

HZ

60

60

60

60

60

60

60

60

60

60

60

60

MINIMUM

CIRCUIT

AMPACITY

(MCA)

525

433

349

558

460

370

597

492

395

626

516

414

649

535

429

672

554

444

723

596

481

756

623

502

789

650

523

818

674

542

859

707

569

882

726

584

POWER SUPPLY

QTY.

FIELD WIRE

WIRE

GUAGE

6

6

6

6

6

2

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

300

#4/0

#3/0

300

#4/0

#3/0

350

250

#3/0

400

300

#4/0

400

300

#4/0

500

300

#4/0

500

350

250

500

400

250

600

400

300

600

500

300

600

500

300

600

500

350

QTY.

380A

380*

460

575

60

905

745

599

6

6

6

600

500

350

2

2

2

380* 931 6 600 2

425A 460 60 770 6 600 2

575 619 6 350 2

Note: Table based on 75

°

C field wire except for 380V ALS 360, 370, and 425 which require 90

°

C field wire,

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

HUB

3.0

3.0

2.5

3.0

3.0

2.5

3.0

3.0

2.5

3.0

3.0

2.0

3.0

3.0

2.0

3.0

2.5

2.0

3.0

2.5

2.0

3.0

2.0

2.0

3.0

2.5

2.0

2.5

2.0

2.0

2.5

2.0

2.0

NOMINAL

SIZE

2.0

2.0

1.5

2.0

2.0

1.5

2.5

2.0

1.5

FIELD FUSE SIZE

1000

800

700

1000

800

700

1000

800

700

1000

800

600

1000

800

600

800

700

600

800

700

600

800

600

500

800

700

500

700

600

500

800

600

500

RECOM-

MENDED

600

500

400

700

500

450

700

600

450

MAXIMUM

1000

800

600

1000

800

700

800

700

600

1000

800

600

1000

800

700

1000

800

700

800

700

500

800

700

600

800

600

500

800

700

500

700

600

500

800

600

500

600

500

450

700

500

450

IOMM ALS

33

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

470

429

259

214

171

470

429

259

214

171

484

439

284

219

176

416

381

230

190

152

410

375

226

187

150

MINIMUM

CIRCUIT

AMPS

(MCA)

329

301

182

150

122

329

301

182

150

122

410

375

226

187

150

Table 33, Multiple Point Connection, ALS 125-204

ALS

UNIT

SIZE

125A

140A

155A

170A

175A

185A

195A

204A

VOLTS HZ

60

60

60

60

60

60

60

60

250

#4/0

300

#4/0

#2/0

250

#4/0

300

#4/0

#2/0

250

#4/0

300

#4/0

#3/0

#4/0

500

#4/0

#3/0

#1/0

#4/0

#3/0

#4/0

#3/0

#2/0

6

6

3

3

6

6

3

3

3

3

3

3

6

6

3

6

6

3

3

3

3

3

6

3

3

6

3

3

3

3

3

3

3

3

3

3

3

3

3

3

ELECTRICAL CIRCUIT #1

POWER SUPPLY

FIELD WIRE

QTY

WIRE

GAUGE QTY

HUB

HUB

SIZE

400

350

#3/0

#1/0

#1

1

1

1

1

1

3.0

2.5

2.0

1.5

1.5

400

350

#3/0

#1/0

#1

#4/0

500

#4/0

#3/0

#1/0

2

1

1

1

1

1

1

1

1

1

3.0

2.5

2.0

1.5

1.5

2.0

3.0

2.0

2.0

1.5

2

2

1

1

2

2

1

1

1

1

1

1

2

2

1

2

2

1

1

1

1

1

2

1

1

2.5

2.0

2.5

2.0

1.5

2.5

2.0

2.5

2.0

1.5

2.5

2.0

2.5

2.0

2.0

2.0

2.0

2.0

2.0

1.5

2.0

3.0

2.0

2.0

1.5

600

500

350

250

225

600

500

350

250

225

700

600

400

300

250

500

500

300

250

200

500

500

300

250

200

400

400

225

200

150

500

500

300

250

200

FIELD FUSING

REC MAX

Fuse

SIZE

FUSE

SIZE

400

400

225

200

150

500

500

300

250

200

500

500

300

250

200

700

600

350

300

250

800

700

400

350

250

800

700

400

350

250

800

700

450

350

300

700

600

350

300

250

700

600

350

300

250

470

429

259

214

171

470

429

259

214

171

484

439

264

219

176

470

429

259

214

171

464

423

255

211

169

MINIMUM

CIRCUIT

AMPS

(MCA)

329

301

182

150

122

404

369

223

184

148

410

375

226

187

150

250

#4/0

300

#4/0

#2/0

250

#4/0

300

#4/0

#2/0

250

#4/0

300

#4/0

#3/0

250

#4/0

250

#4/0

#2/0

250

#4/0

300

#4/0

#2/0

6

6

3

3

6

6

3

3

3

3

3

3

6

6

3

6

6

3

3

3

3

3

6

6

3

6

3

3

3

6

3

3

3

3

3

3

3

3

3

3

ELECTRICAL CIRCUIT #2

POWER SUPPLY

FIELD WIRE

QTY

WIRE

GAUGE QTY

HUB

HUB

SIZE

400

350

#3/0

#1/0

#1

1

1

1

1

1

3.0

2.5

2.0

1.5

1.5

#4/0

500

#4/0

#3/0

#1/0

#4/0

500

#4/0

#3/0

#1/0

2

1

1

1

2

1

1

1

1

1

2.0

3.0

2.0

2.0

1.5

2.0

3.0

2.0

2.0

1.5

1

1

1

1

1

1

1

1

1

1

1

1

2

2

1

2

2

1

1

1

1

1

2

2

1

2.5

2.0

2.5

2.0

1.5

2.5

2.0

2.5

2.0

1.5

2.5

2.0

2.5

2.0

2.0

2.5

2.0

2.5

2.0

1.5

2.5

2.0

2.5

2.0

1.5

600

500

350

250

225

600

500

350

250

225

700

600

400

300

250

600

500

350

250

225

600

500

350

250

225

500

500

300

250

200

500

500

300

250

200

FIELD FUSING

REC MAX

FUSE

SIZE

FUSE

SIZE

400

400

225

200

150

500

500

300

250

200

700

600

350

300

250

700

600

350

300

250

800

700

400

350

250

800

700

400

350

250

800

700

450

350

300

800

700

400

350

250

800

700

400

350

250

34

IOMM ALS

Table 34, Multiple Point Connection, ALS 205-280

ALS

UNIT

SIZE

205A

220A

235A

VOLTS

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

HZ

60

60

60

250A

265A

208

230

380

460

575

208

230

380

460

575

60

60

410

375

227

187

150

410

375

227

187

150

280A

208

230

380 60

464

423

256

460

575

211

170

Note: Circuit #3 continued on next page

3

3

6

6

3

6

6

3

3

3

3

3

6

3

3

329

302

182

150

122

410

375

227

184

150

MIN.

CIRCUIT

AMPS

(MCA)

329

302

182

150

122

6

6

3

3

3

3

3

3

3

3

3

3

3

3

3

ELECTRICAL CIRCUIT #1

POWER SUPPLY

FIELD WIRE

QTY

WIRE

GAUGE QTY

HUB

HUB

SIZE

400

350

#3/0

#1/0

#1/0

1

1

1

1

1

2.5

2.5

1.5

1.25

1.25

400

350

#3/0

#1/0

#1/0

300

250

#4/0

#3/0

#1/0

1

1

1

1

1

1

1

1

1

1

2.5

2.5

1.5

3

3

1.25

1.25

2

1.5

1.25

300

250

#4/0

#3/0

#1/0

300

250

#4/0

#3/0

#1/0

350

300

250

#4/0

#2/0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

3

3

2

1.5

1.25

3

3

2

1.5

1.25

3.5

3

2

2

1.5

464

423

256

211

170

410

375

227

187

150

464

423

256

211

170

410

375

223

187

150

410

375

227

187

150

329

302

182

150

122

MIN.

CIRCUIT

AMPS

(MCA)

600

500

300

250

200

600

500

300

250

200

700

600

350

300

250

400

400

250

200

175

600

500

300

250

200

FIELD FUSING

REC MAX

FUSE

SIZE

FUSE

SIZE

400

400

250

200

175

500

500

300

250

200

500

500

300

250

200

700

600

350

300

250

700

600

350

300

250

700

600

350

300

250

800

700

400

350

250

300

250

#4/0

#3/0

#1/0

350

300

250

#4/0

#2/0

350

300

250

#4/0

#2/0

6

6

3

3

3

3

3

6

6

3

6

6

3

3

3

6

6

3

3

6

6

3

3

3

3

3

3

3

3

3

ELECTRICAL CIRCUIT #2

POWER SUPPLY

FIELD WIRE

QTY

WIRE

GAUGE QTY

HUB

HUB

SIZE

400

350

#3/0

#1/0

#1/0

1

1

1

1

1

2.5

2.5

1.5

1.25

1.25

300

250

#4/0

#3/0

#1/0

300

250

#4/0

#3/0

#1/0

1

1

1

1

1

1

1

1

1

1

3

3

2

3

3

1.5

1.25

2

1.5

1.25

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

3.5

3

2

2

1.5

3

3

2

1.5

1.25

3.5

3

2

2

1.5

700

600

350

300

250

600

500

300

250

200

700

600

350

300

250

600

500

300

250

200

600

500

300

250

200

FIELD FUSING

REC MAX

FUSE

SIZE

FUSE

SIZE

400

400

250

200

175

500

500

300

250

200

700

600

350

300

250

700

600

350

300

250

800

700

400

350

250

700

600

350

300

250

800

700

400

350

250

IOMM ALS

35

36

Table 34, Multiple Point Connection, ALS 205-280 (Continued)

ALS MINIMUM

ELECTRICAL CIRCUIT #3

POWER SUPPLY

UNIT

SIZE

205A

220A

235A

250A

265A

280A

VOLTS

410

375

227

187

150

410

375

227

187

150

CIRCUIT

AMPS

(MCA)

410

375

227

187

150

464

423

256

211

170

464

423

256

211

170

464

423

256

211

170

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

HZ

60

60

60

60

60

60

6

6

3

3

6

6

3

3

3

3

3

3

6

6

3

6

6

3

3

3

3

3

6

6

3

FIELD WIRE

QTY

6

6

WIRE

GAUGE

300

250

3

3

3

#4/0

#3/0

#1/0

300

250

#4/0

#3/0

#1/0

300

250

#4/0

#3/0

#1/0

350

300

250

#4/0

#2/0

350

300

250

#4/0

#2/0

350

300

250

#4/0

#2/0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

QTY

1

1

HUB

HUB

SIZE

3.0

3.0

1

1

1

2.0

1.5

1.25

3.0

3.0

2.0

1.5

1.25

3.5

3.0

2.0

2.0

1.5

3.5

3.0

2.0

2.0

1.5

3.5

3.0

2.0

2.0

1.5

3.0

3.0

2.0

1.5

1.25

700

600

350

300

250

700

600

350

300

250

700

600

350

300

250

600

500

300

250

200

600

500

300

250

300

FIELD

FUSING

REC MAX

FUSE FUSE

SIZE SIZE

600

500

300

250

200

700

600

350

300

250

700

600

350

300

250

700

600

350

300

250

800

700

400

350

250

800

700

400

350

250

800

700

400

250

250

IOMM ALS

Table 35, Multiple Point Connection, ALS 300-425

ALS

UNIT

SIZE

300A

315A

330A

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

HZ

60

60

60

MIN.

CIRCUIT

AMPS

(MCA)

693

630

382

315

254

693

630

382

315

254

753

684

415

342

275

ELECTRICAL CIRCUIT #1 & 3

POWER SUPPLY

FIELD WIRE

QTY

WIRE

GAUGE QTY

HUB

HUB

SIZE

6

6

6

3

3

6

6

6

3

3

6

6

6

3

3

500

400

250

400

250

500

400

250

400

250

500

500

300

500

300

2

2

1

1

1

2

2

1

1

2

2

1

1

1

1

3.0

2.5

3.0

2.5

2.0

3.0

2.5

3.0

2.5

2.0

3.0

3.0

3.0

3.0

2.0

FIELD FUSING

REC MAX

FUSE

SIZE

800

800

450

400

350

800

800

450

400

350

1000

800

500

400

350

FUSE

SIZE

800

800

500

450

350

340A

360A

60

60

822

746

453

373

300

753

684

415

342

275

6

6

6

3

3

6

3

6

6

3

600

500

300

500

350

500

500

300

500

300

2

2

1

1

1

1

1

2

2

1

3.0

3.0

3.0

3.0

2.5

3.0

3.0

3.0

3.0

2.0

1000

800

500

400

350

1000

1000

500

450

400

370A

380A

208*

230

380

460

575

208*

230

380

460

575

60

60

822

746

453

373

300

865

784

476

392

315

6

6

6

3

3

6

6

6

3

3

600

500

300

500

350

600

600

350

600

400

2

2

1

1

1

2

2

1

1

1

3.0

3.0

3.0

3.0

2.5

3.0

3.0

3.5

3.0

2.5

1000

1000

500

450

400

1000

1000

500

450

400

425A

208*

230

380

460

60

892

808

489

404

6

6

6

3

600

600

350

600

2

2

1

1

3.0

3.0

3.0

3.0

1200

1000

500

500

1200

1000

600

500

575 325 3 400 1 2.5

400 400

Note: Table based on 75

°

C field wire except 208V ALS 370 and 380 which require 90

°

C field wire

1000

1000

600

500

400

1000

1000

600

500

400

1000

800

500

450

350

1000

1000

600

500

400

800

800

500

450

350

1000

800

500

450

350

865

784

476

392

315

865

784

476

392

315

892

808

489

404

325

822

746

453

373

300

807

732

444

366

294

MIN.

CIRCUIT

AMPS

(MCA)

693

630

382

315

254

753

684

415

342

275

753

684

415

342

275

600

600

350

600

400

600

600

350

600

400

1200

1000

600

500

400

600

500

300

500

350

600

500

300

500

350

6

6

3

3

6

6

6

6

3

3

6

3

6

6

3

6

6

6

3

3

6

3

6

6

3

6

6

3

3

6

6

6

6

3

3

6

6

6

3

3

ELECTRICAL CIRCUIT #2 & 4

POWER SUPPLY

FIELD WIRE

QTY

WIRE

GAUGE QTY

HUB

HUB

SIZE

500

400

250

400

250

2

2

1

1

1

3.0

2.5

3.0

2.5

2.0

500

400

300

400

250

500

500

300

500

300

2

2

1

1

2

2

1

1

1

1

3.0

3.0

3.0

3.0

2.0

3.0

3.0

3.0

3.0

2.0

2

2

1

1

2

2

1

1

1

1

1

1

2

2

1

2

2

1

1

1

1

1

2

2

1

3.0

3.0

3.5

3.0

2.5

3.0

3.0

3.5

3.0

2.5

3.0

3.0

3.0

3.0

2.5

3.0

3.0

3.0

3.0

2.5

3.0

3.0

3.0

3.0

2.5

1000

1000

500

450

400

1000

1000

500

450

400

1200

1000

600

500

400

1000

1000

500

450

350

1000

1000

500

450

400

1000

800

500

400

350

1000

800

500

400

350

FIELD FUSING

REC MAX

FUSE

SIZE

FUSE

SIZE

800

800

450

400

350

800

800

500

450

350

1000

800

500

450

350

1000

800

500

450

350

1000

1000

600

500

400

1000

1000

600

500

400

1200

1000

600

500

400

1000

1000

600

500

400

1000

1000

600

500

400

IOMM ALS

37

Compressor and Condenser Fan Motors

Table 36, Amp Draw, ALS 070-100

RATED LOAD AMPS ALS

UNIT

SIZE VOLTS HZ COMPRESSOR

070A

080A

090A

100A

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

60

60

60

60

343

310

188

155

124

343

310

188

155

124

240

218

132

109

88

300

272

165

136

109

5.8

2.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

FAN

MOTORS

FLA

(EACH)

5.8

5.8

3.4

2.8

2.3

5.8

2.8

3.4

2.8

2.3

8

8

8

8

8

6

6

6

6

6

NUMBER

OF

FAN

MOTORS

6

6

6

6

6

8

8

8

8

8

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

FAN

MOTORS

(EACH)

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

LOCKED ROTOR AMPS

COMPRESSOR

ACROSS-THE-LINE

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

REDUCED INRUSH

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

Table 37, Amp Draw, ALS 125-170

RATED LOAD AMPS

COMPRESSORS ALS

UNIT

SIZE

VOLTAGE HZ

NO. 1 NO. 2

125A

140A

155A

170A

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

60

60

60

60

240

218

132

109

88

240

218

132

109

88

300

272

165

136

109

300

272

165

136

109

300

272

165

136

109

240

218

132

109

88

300

272

165

136

109

343

310

188

155

124

FAN

MOTORS

FLA

(EACH)

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

NO. OF

FAN

MOTORS

10

10

10

10

10

10

10

10

10

10

12

12

12

12

12

12

12

12

12

12

FAN

MOTORS

(EACH)

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

LOCKED ROTOR AMPS

PER COMPRESSORP

ACROSS-THE-LINE REDUCED INRUSH

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

38

IOMM ALS

Table 38, Amp Draw, ALS 175-204

RATED LOAD AMPS

COMPRESSORS ALS

UNIT

SIZE

VOLTAGE HZ

175A

185A

195A

204A

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

208

230

380

460

575

60

60

60

60

NO. 1

300

272

165

136

109

343

310

188

155

124

343

310

188

155

124

343

310

188

155

124

NO. 2

343

310

188

155

124

343

310

188

155

124

343

310

188

155

124

343

310

188

155

124

FAN

MOTORS

FLA

(EACH)

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

7.8

7.2

4.1

3.6

3.0

5.8

5.8

3.4

2.8

2.3

NO. OF

FAN

MOTORS

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

FAN

MOTORS

(EACH)

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

30.5

27.6

20.0

13.8

11.5

LOCKED ROTOR AMPS

PER COMPRESSORP

ACROSS-THE-LINE

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

REDUCED INRUSH

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

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

Table 39, Amp Draw, ALS 205-280

RATED LOAD AMPS

COMPRESSORS ALS

UNIT

SIZE

VOLTAGE HZ

205A

220A

235A

250A

265A

280A

60

60

60

60

60

60

300

272

165

136

109

300

272

165

136

109

300

272

165

136

109

343

310

188

155

124

NO. 1

240

218

132

109

88

240

218

132

109

88

300

272

165

136

109

300

272

165

136

109

343

310

188

155

124

343

310

188

155

124

NO. 2

240

218

132

109

88

300

272

165

136

109

343

310

188

155

124

300

272

165

136

109

343

310

188

155

124

343

310

188

155

124

NO. 3

300

272

165

136

109

300

272

165

136

109

18

18

18

18

18

18

18

18

18

18

18

18

18

18

18

18

18

18

18

18

NO. OF

FAN

MOTORS

16

16

16

16

16

16

16

16

16

16

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

FAN

MOTORS

FLA

(EACH)

5.8

5.8

3.4

2.8

2.3

5.8

5.8

3.4

2.8

2.3

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

FAN

MOTORS

(EACH)

23.7

21.4

14.4

10.7

11.5

23.7

21.4

14.4

10.7

11.5

LOCKED ROTOR AMPS

PER COMPRESSORP

ACROSS-THE-LINE

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

REDUCED INRUSH

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

IOMM ALS

39

Table 40, Motor Amps, ALS 300-425

RATED LOAD AMPS

COMPRESSORS ALS

UNIT

SIZE

VOLTAGE HZ

NO. 1 NO. 2 NO. 3 NO. 4

300A

315A

330A

340A

360A

370A

380A

425A

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

60

60

60

60

60

60

60

60

300

272

165

136

109

300

272

165

136

109

343

310

188

155

124

343

310

188

155

124

240

218

132

109

88

240

218

132

109

88

300

272

165

136

109

300

272

165

136

109

343

310

188

155

124

300

272

165

136

109

343

310

188

155

124

343

310

188

155

124

300

272

165

136

109

240

218

132

109

88

300

272

165

136

109

300

272

165

136

109

343

310

188

155

124

343

310

188

155

124

343

310

188

155

124

343

310

188

155

124

300

272

165

136

109

300

272

165

136

109

300

272

165

136

109

300

272

165

136

109

343

310

188

155

124

343

310

188

155

124

343

310

188

155

124

343

310

188

155

124

300

272

165

136

109

300

272

165

136

109

300

272

165

136

109

343

310

188

155

124

FAN

MOTORS

FLA

(EACH)

7.8

7.2

4.1

3.6

3.0

7.8

7.2

4.1

3.6

3.0

7.8

7.2

4.1

3.6

3.0

10.0

9.2

5.5

4.6

3.8

7.8

7.2

4.1

3.6

3.0

7.8

7.2

4.1

3.6

3.0

7.8

7.2

4.1

3.6

3.0

7.8

7.2

4.1

3.6

3.0

NO. OF

FAN

MOTORS

24

24

24

24

24

24

24

24

24

24

24

24

24

24

24

24

24

24

24

24

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

FAN

MOTORS

(EACH)

30.5

27.6

20.0

13.8

11.5

30.5

27.6

20.0

13.8

11.5

30.5

27.6

20.0

13.8

11.5

48.1

43.5

26.4

21.8

17.4

30.5

27.6

20.0

13.8

11.5

30.5

27.6

20.0

13.8

11.5

30.5

27.6

20.0

13.8

11.5

30.5

27.6

20.0

13.8

11.5

LOCKED ROTOR AMPS

PER COMPRESSORP

REDUCED INRUSH ACROSS-THE-

LINE

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

1459

1628

943

764

589

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

934

1042

604

489

377

40

IOMM ALS

Customer Wiring

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

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

Table 41, Customer Wiring with Single Point Connection (ALS 070-204)

ALS

UNIT SIZE

070A

080A

090A

100A

125A

140A

155A

170A

175A

185A

195A

204A

VOLTS HZ

60

60

60

60

60

60

60

60

60

60

60

60

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

950

840

840

840

840

950

840

840

840

840

950

840

840

840

WIRING TO UNIT POWER BLOCK

POWER BLOCK

TERMINAL SIZE

AMPS

CONNECTOR WIRE RANGE

(COPPER WIRE ONLY)

840

840

840

840

840

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

IOMM ALS

-

-

600

400

400

-

-

400

400

400

-

-

600

400

400

-

-

600

400

400

-

-

600

600

400

-

-

600

600

400

-

-

600

600

600

400

250

250

250

-

-

400

400

250

600

400

250

250

250

400

400

250

250

250

WIRING TO DISCONNECT SWITCH

OPTIONAL DISCONNECT SWITCH

SIZE

400

CONNECTOR WIRE RANGE

(COPPER WIRE ONLY)

(1) 250 to 500 MCM

(1) 250 to 500 MCM 400

400

150

150

(1) 250 to 500 MCM

(1) #2 to 3/0

(1) #2 to 3/0

(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

(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

(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

See note 9

See note 9

(1) 250 to 500 MCM

(1) 250 to 500 MCM

(1) #4 to 350 MCM

See note 9

See note 9

(1) 250 to 500 MCM

(1) 250 to 500 MCM

(1) 250 to 350 MCM

See note 9

See note 9

(2) 250 to 500 MCM

(1) 250 to 500 MCM

(1) 250 to 350 MCM

See note 9

See note 9

(2) 250 to 500 MCM

(1) 250 to 500 MCM

(1) 250 to 350 MCM

See note 9

See note 9

(2) 250 to 500 MCM

(1) 250 to 500 MCM

(1) 250 to 350 MCM

See note 9

See note 9

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(1) 250 to 350 MCM

See note 9

See note 9

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(1) 250 to 350 MCM

See note 9

See note 9

(2) 250 to 500 MCM

(2) 250 to 500 MCM

41

575 840 (2) #2 TO 600 MCM 400 (1) 250 to 350 MCM

42

IOMM ALS

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

380

460

575

Table 42, Customer Wiring With Single Point Connection, ALS 205-425

ALS

UNIT SIZE

205A

220A

235A

250A

265A

280A

300A

315A

330A

340A

360A

370A

380A

425A

VOLTS HZ

60

60

60

60

60

60

60

60

60

60

60

60

60

60

950

840

840

950

840

840

950

840

840

950

840

840

840

840

840

840

840

840

840

840

840

840

840

840

WIRING TO UNIT POWER BLOCK

POWER BLOCK

TERMINAL SIZE

AMPS

CONNECTOR WIRE RANGE

(COPPER WIRE ONLY)

840

840

840

840

840

840

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

840

840

840

840

840

840

840

840

840

840

840

840

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

(2) #2 to 600 MCM

1200

1200

800

1200

1200

800

1200

800

800

1200

800

800

1200

800

600

1200

800

600

800

800

600

1200

800

600

800

600

600

800

600

600

600

600

400

800

600

600

WIRING TO DISCONNECT SWITCH

OPTIONAL DISCONNECT SWITCH

SIZE

CONNECTOR WIRE RANGE

(COPPER WIRE ONLY)

600

600

400

600

600

400

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(1) 250 to 350 MCM

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(1) 250 to 500 MCM

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(1) 250 to 500 MCM

(2) 500 to 750 MCM

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(2) 500 to 750 MCM

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(2) 500 to 750 MCM

(2) 250 to 500 MCM

(2) 250 to 500 MCM

(2) 400 to 700 MCM

(2) 400 to 700 MCM

(2) 250 to 500 MCM

(2) 500 to 750 MCM

(2) 400 to 700 MCM

(2) 250 to 500 MCM

(2) 500 to 750 MCM

(2) 400 to 700 MCM

(2) 250 to 500 MCM

(2) 500 to 750 MCM

(2) 400 to 700 MCM

(2) 250 to 500 MCM

(3) 500 to 750 MCM

(2) 400 to 700 MCM

(2) 250 to 500 MCM

(3) 500 to 750 MCM

(2) 400 to 700 MCM

(2) 400 to 700 MCM

(3) 500 to 750 MCM

(3) 500 to 750 MCM

(2) 400 to 700 MCM

(3) 500 to 750 MCM

(3) 500 to 750 MCM

(2) 400 to 700 MCM

IOMM ALS

43

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

Table 43, Customer Wiring With Multiple Point Power, ALS 125-204

ALS

UNIT SIZE

125A

140A

155A

170A

175A

185A

195A

204A

VOLTS HZ

60

60

60

60

60

60

60

60

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

TERMINAL SIZE (AMPS)

CKT 1 CKT 2

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

WIRING TO UNIT POWER BLOCK

POWER BLOCK

CONNECTOR WIRE RANGE (COPPER WIRE ONLY)

CKT 1 CKT 2

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

44

IOMM ALS

Table 44, Customer Wiring With Multiple Point Power, ALS 205A-280A

ALS

UNIT SIZES

205A

220A

235A

250A

265A

280A

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

HZ

60

60

60

60

60

60

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

TERMINAL SIZE (AMPS)

CKT 1 CKT 2 CKT 3

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

WIRING TO UNIT POWER BLOCK

POWER BLOCK

CONNECTOR WIRE RANGE (COPPER WIRE ONLY)

CKT 1 CKT 2 CKT 3

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

IOMM ALS

45

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

Table 45, Customer Wiring With Multiple Point Wiring, ALS 300A-425A

ALS

UNIT SIZE

300A

315A

330A

340A

360A

370A

380A

425A

VOLTS HZ

60

60

60

60

60

60

60

60

950

840

840

840

840

950

840

840

840

840

950

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

TERMINAL SIZE (AMPS)

CKT 1 CKT 2

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

840

950

840

840

840

840

950

840

840

840

840

950

840

840

840

840

WIRING TO UNIT POWER BLOCK

POWER BLOCK

CONNECTOR WIRE RANGE (COPPER WIRE ONLY)

CKT 1 CKT 2

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

(2) #2 TO 600 MCM

46

IOMM ALS

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 ALS300A-

425A 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 ALS185A-

ALS204A 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.

47

Table 46

Electrical Legend

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

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

51

52

Figure 28, Control Center Layout, ALS 205A-280A

Figure 29, Control Center Layout, ALS 300A-425A

IOMM ALS

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 start-

up. 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.

53

54

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

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

56

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.

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.

58

IOMM ALS

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.

59

60

Preventative Maintenance Schedule

PREVENTATIVE MAINTENANCE SCHEDULE

OPERATION WEEKLY MONTHLY

(Note 1)

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

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

X

X

X

X

X

ANNUAL

(Note 2)

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:

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.

X

X

X

X

IOMM ALS

Service

IOMM ALS

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

LOADING %

100%

75%

50%

25%

COMPRESSOR UN LOADING SOLENOID STATUS

TOP

SOLENOID

Energized

Energized

O f f

O f f

BOTTOM FRONT

SOLENOID

O f f

Energized

O f f

Energized

BOTTOM REAR

SOLENOID

Energized

O f f

Energized

O f f

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 (%)

100%

75%

50%

25%

MAXIMUM RECOMMENDED PRESSURE

DROP ACROSS FILTER DRIER PSIG (KPA)

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.

61

62

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.

IOMM ALS

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.

63

Figure 31,. Electronic expansion valve

64

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.

IOMM ALS

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.

65

66

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

°

F-

20

°

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.

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

DESCRIPTION SENSOR

NUMBER

S00

S01

S02

S03

S04

S06

S07

S08

S09

S11

S12

Evap. Leaving water temp.

Evap. Pressure transducer circ. #1

Evap. Pressure transducer circ. #2

Cond. Pressure transducer circ. #1

Cond. Pressure transducer circ. #2

Evap. Water temp reset

Demand limit

Evap. Entering water temp.

Outside air temp.

Total unit amps

Section temp. circ. #3

Figure 33, Sensor Locations, ALS 205-280

SENSOR

NUMBER

S13

S14

S15

S16

S17

S18

S19

S20

S21

S22

DESCRIPTION

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

Table 50, Sensor Location, ALS 205 - 280

DESCRIPTION SENSOR

NUMBER

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

SENSOR

NUMBER

S09

S10

S11

S12

S13

S14

S15

S16

DESCRIPTION

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

SENSOR

NUMBER

S17

S18

S19

S20

S21

S22

S23

DESCRIPTION

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

DESCRIPTION SENSOR

NUMBER

S00

S01

S02

S03

Evap leaving water temp

Low pressure transducer circ. #1

Low pressure transducer circ. #2

High pressure transducer circ. #1

SENSOR

NUMBER

S09

S10

S11

S12

S04

S06

S07

S08

High pressure transducer circ. #2

Evap water temp reset (field supplied)

Demand limit (field supplied)

Evap entering water temp

S13

S14

S15

S16

DESCRIPTION

Outside air temp

Percent circuit amps circ. #1 & 3

Percent circuit amps circ. #2 & 4

Suction temp circ. #1

Suction temp circ. #2

Liquid line temp circ. #1

Liquid line temp circ. #2

Low pressure transducer circ. #3

SENSOR

NUMBER

S17

S18

S19

S20

S21

S22

S23

DESCRIPTION

High pressure transducer circ. #3

Suction temp circ. #3

Liquid line temp circ. #3

Low pressure transducer circ. #4

High pressure transducer circ. #4

Suction temp circ. #4

Liquid line temp circ. #4

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

72

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

IOMM ALS

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

MicroTech fan stage

Fan output relay on

Total fans operating

MicroTech fan stage

Fan output relay on

Total fans operating

MicroTech fan stage

Fan output relay on

Total fans operating

MicroTech fan stage

Fan output relay on

Total fans operating

MicroTech fan stage

Fan output relay on

Total fans operating

MicroTech fan stage

Fan output relay on

Total fans operating

MicroTech fan stage

Fan output relay on

Total fans operating

(Continued)

ALS070A THRU ALS 080A (FANS PER CKT=3)

0 1 2 3

-

1

1

2

2

3

1,2

4

ALS090A THRU ALS 100A (FANS PER CKT=4)

0

-

1

1

1

2

2

2

3

3

1,2

4

ALS125A THRU ALS140A (FANS PER CKT=5)

4

1,2,3

6

4

1,2,3

6

0

-

1

0

-

1

1

1

2

1

1

2

2

1,2

3

2

1,2

3

3

1,2,3

4

3

1,3

4

ALS205A THRU ALS220A (FANS PER CKT=5)

4

1,2,3,4

5

ALS155A THRU ALS170A (FANS PER CKT=6) (Note 1)

0 1 2 3 4

-

1

1

2

1,2

3

1,2,3

4

ALS175A THRU 204A (FANS PER CKT=7) (Note 2)

1,2,4

5

4

1,2,3

5

0

-

1

1

1

2

2

1,2

3

3

1,2,3

4

ALS205A THRU ALS220A (FANS PER CKT=6) (Note 3)

4

1,2,3,4

5

0

-

1

1

1

2

2

1,2

3

3

1,2,3

4

ALS235A THRU 280A (FANS PER CKT=7)

0 1 2 3

-

1

1

2

1,2

3

1,2,3

4

4

1,2,4

5

4

1,2,4

5

5

1,2,3,4

8

5

1,2,3,4

6

5

1,3,4

6

5

1,2,3,4

6

5

1,2,3,4

6

6

1,2,3,4

7

73

74

(Table 52 Continued)

MicroTech fan stage

Fan output relay on

Total fans operating

MicroTech fan stage

Fan output relay on

Total fans operating

ALS300A THRU ALS340A (FANS PER CKT=5)

0

-

1

1

1

2

2

1,2

3

3

1,2,3

4

ALS360A THRU ALS425A (FANS PER CKT=6)

0

-

1

1

1

2

2

1,2

3

3

1,2,3

4

4

1,2,3,4

5

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.

IOMM ALS

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

12 psig (84 kPa)

8 psig (56 kPa)

4 psig (28 kPa)

0 psig (0 kPa)

TIME

(SECONDS)

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.

75

76

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.

IOMM ALS

Figure 35, Hot Gas Bypass Piping

IOMM ALS

77

Controls, Settings and Functions

Table 54, Controls

Valve

DESCRIPTION

Compressor Heaters

Compressor

Solenoid - Top

Compressor

Solenoid - Bottom

Compressor

Solenoid - Bottom

Evaporator Heater

Electronic Expansion

Valve Board

Electronic Expansion

Gardister Relay

Liquid Presence Sensor

FUNCTION

To provide heat to drive off liquid refrigerant when compressor is off.

In circuit 1,2,3 and 4 energizes to load 50% of compressor capacity.

In circuit 1,2,3 and 4 energizes to unload 25% of compressor capacity.

In circuit 1,2,3 and 4 energizes to load 25% of compressor capacity.

Coiled around the evaporator to prevent freezing the water inside.

To provide power and step control to the EXV stepper motors commanded by the MCB250.

To provide efficient unit refrigerant flow and control superheat.

To provide motor temperature protection at about

220 o

F (104 o

C).

To protect compressor from starting with liquid or running without liquid.

SYMBOL

HTR1,2,3,4

CS11,21,

31,41

CS12,22,

32,42

CS13,23,

33,43

HTR5

EXV (Bd)

EXV

GD1,2,3,4

LPS1,2,3,4

On, when compressor is off.

N/A

N/A

N/A

38

SETTING o

F (3.3

N/A

None, o

C)

In Controller Code

Inherent in design

400 psig (2760 kPa)

RESET

N/A

N/A

N/A

N/A

N/A

N/A

N/A

Auto

Auto

LOCATION

On the Compressor

On the Compressor

On the Compressor

On the Compressor

On the Cooler

Control Box

On the Compressor main liquid line

Control Box

On the Compressor

Mechanical High

High Pressure Switch

MicroTech Unit

Controller

Motor Protector Relay

For UL, ETL, etc…safety code to prevent high pressure above the relief valve.

To control unit and all safeties. Refer to IM 549.

MHPR1,2,3,4

MCB250

Refer to IM 549

N/A

Defined by application

N/A

Auto

Refer to IM 549

Auto

Control Box

Control Box

Overloads (Compressor)

Phase Voltage Monitor

To provide voltage isolation to the input board

(ADI).

to protect the compressor motor from over heating due to high amps.

to prevent reverse rotation of the motor and protect it from under/over voltage.

To provide 1 sec delay for reduced inrush.

MPR1,2,3,4

OL1-8

PVM1,2,3,4 N/A

Manual

Auto

Control Box

Control Box

Control Box

Reduced Inrush

Time Delay

Signal Converter To convert AC current signal volts to DC volts.

TD5,6,7,8

SIG.Con

V (SC)

SV5,6,9

Set 4Vdc for full load amps

0-75 psig

(0-517 kPa)

N/A

N/A

Control Box

Control Box

Solenoid Valve

Hot Gas Bypass

To allow the unit to run with very low load.

N/A Discharge LIne

Solenoid Valve

Liquid Line

Solenoid Valve

Liquid Injection

To provide a positive shut off of liquid refrigerant when power is lost.

To only allow liquid injection when the compressor is running.

To provide more uniform head pressure control.

SV1,2,7

SV3,4,8

N/A

N/A

N/A

N/A

Liquid Line

On Compressor

Liquid Injection

Above Control Box SpeedTrol Head

Pressure Control

SC11,21,

31,41

N/A N/A

Surge Capacitor To protect from high voltage spikes and surges.

C1,2,3,4 N/A N/A Control Box

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

1. Main power switch open.

2. Unit S1 system switch open.

3. Circuit switch PS1, PS2, PS3, PS4 in pumpdown position.

4. Evap flow switch not closed.

5. Circuit breakers open.

6. Fuse blown or circuit breakers tripped.

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.

POSSIBLE CORRECTIVE STEPS

1. Close switch.

2. Check unit status on MicroTech display. Close switch.

3. Check circuit status on MicroTech display. Close switch.

4. Check unit status on MicroTech display. Close switch.

5. Close circuit breakers.

6. Check electrical circuits and motor windings for shorts or grounds.

Investigate for possible overloading. Check for loose or corroded 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 or Vibrating

1. Compr. Internal problem.

2. Liquid injection not adequate.

1. Contact McQuayService

2. Check to assure liquid line sightglass is full during steady operation.

Compressor

Overload Relay

Tripped or Circuit

Breaker Trip or

Fuses Blown

1. Low voltage during high load condition.

2. Loose power wiring.

3. Power line fault causing unbalanced voltage.

4. Defective or grounded wiring in the motor.

5. High discharge pressure.

1. Check supply voltage for excessive voltage drop.

2. Check and tighten all connections.

3. Check supply voltage.

4. Check motor and replace if defective.

5. See corrective steps for high discharge pressure.

Compressor Will

Not Load or Unload

1. Defective capacity control solenoids.

2. Unloader mechanism defective.

1. Check solenoids for proper operation. See capacity control section.

2. Replace.

Compressor Liquid

Injection Protection

Trip

1. Liquid injection solenoid did not open at start.

2. Inadequate liquid to liquid injection at start due to a clogged filter drier or low charge.

3. Inadequate liquid to liquid injection during run.

1. Check and replace liquid injection solenoid.

2. Check liquid injection line sight glass. If flashing check filter drier 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.

High Discharge

Pressure

1. Discharge shutoff valve partially closed.

2. Noncondensables in the system.

3. Fans not running.

1. Open shutoff valve.

2. Purge the noncondensables from the condenser coil after shutdown.

3. Check fan fuses and electrical circuits.

IOMM ALS

79

High Discharge

Pressure

4. Fan control out of adjustment.

5. System overcharged with refrigerant.

6. Dirty condenser coil.

7. Air recirculation from outlet into unit coils.

8. Air restriction into unit.

4. Check that unit setup in MicroTech matches the unit model number.

Check MicroTech condenser pressure sensor for proper operation.

5. 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.

Low Discharge

Pressure

Low Suction

Pressure

High Suction

Pressure

1.

2.

3.

4.

Wind effect a low ambient temperature.

Condenser fan control not correct.

Low section pressure.

Compressor operating unloaded.

1. Protect unit against excessive wind into vertical coils.

2. Check that unit setup in MicroTech matches the unit model number.

Check SpeedTrol fan on units with SpeedTrol option.

3. See corrective steps for low suction pressure.

4. See corrective steps for failure to load.

1. Inadequate refrigerant charge quantity.

2. Inadequate liquid to liquid injection at start. Clogged liquid line filter-drier.

3. Expansion valve malfunctioning.

4. Insufficient water flow to evaporator.

5. Water temperature leaving evaporator is too low.

6. Evaporator tubes fouled.

7. Evaporator head ring gasket slippage.

8. Glycol in chilled water system

1. Check liquid line sightglass. Check unit for leaks. Repair and recharge to clear sightglass.

2. Check pressure drop across filter-drier. Replace cores.

3. Check expansion valve superheat and valve opening position.

Replace valve only if certain valve is not working.

4. Check water pressure drop across the evaporator and adjust gpm.

5. Adjust water temperature to higher value.

6. Inspect by removing water piping. Clean chemically.

7. Low suction pressure and low superheat both present may indicate an internal problem. Consult factory.

8. Check glycol concentration

1. Excessive load - high water temperature.

2. Compressor unloaders not loading compressor.

3. Superheat is too low.

1. Reduce load or add additional equipment.

2. See corrective steps below for failure of compressor to load.

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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