McQuay AGS 140DH Installation Manual

Download

Page 1

Installation and Maintenance Manual

IMM AGSD3

Air-Cooled Screw Compressor Chiller

AGS 140DS/H - AGS 210DS/H, Packaged AGS 140DM/F – AGS 210DM/F, Remote Evaporator

60 Hertz, R-134a

Group: Chiller Part Number:: 331376001 Date: FEB 2008 Supersedes: DEC 2007

Page 2

Table of Contents

Introduction..............................................3

General Description.............................3

Nomenclature ......................................3

Inspection ............................................3

Field Wiring Diagram.............................38

Remote Evaporator ...............................44

Piping Layout.....................................44

Field Wiring (Remote Evaporator).....45

Installation and Start-up ..........................4

Handling...............................................4

Location ...............................................5

Service Access ....................................5

Clearance Requirements.....................6

Restricted Airflow.................................7

Vibration Isolator Location.................13

Chilled Water Pump...........................16

Kit Components .................................45

Refrigerant Line Sizing ......................46

Remote Evaporator Dimensions & Weights

...............................................................

Physical Data, Standard Efficiency....53

Vibration Isolators..............................55

Solid State Starters................................57

Water Piping......................................16

System Water Volume.......................17

Variable Speed Pumping...................17

Evaporator Freeze Protection............18

Operating Limits:................................19

Component Location .............................64

Major Component Location................64

Power Panel.......................................66

Control Panel.....................................67

Flow Switch........................................19

Refrigerant Charge............................20

Glycol Solutions.................................20

Water Flow and Pressure Drop.............21

Physical Data ........................................23

Dimensions & Weights..........................25

Lifting, Mounting, and Total Weights..28

Electrical Data.......................................30

Field Wiring........................................30

Standard Efficiency............................31

High Efficiency...................................35

BAS Interface.....................................37

System Maintenance.............................68

Preventative Maintenance Schedule.70

Warranty Statement...............................71

Service...................................................71

Liquid Line Filter-Driers......................71

Compressor Slide Valves...................72

Electronic Expansion Valve (EXV).....72

Evaporator .........................................72

Charging Refrigerant .........................72

St andard Controls..............................73

Controls, Settings and Functions.......76

Troubleshooting Chart.......................77

Periodic Maintenance Log.................78

Unit controllers are LONMARK certified

with an optional

communications module

LONWORKS

Manufactured in an ISO Certified Facility

in design and construction at anytime without notice. ™® The following are trademarks or registered trademarks of their respective companies: BACnet from ASHRAE;

LONMARK, LonTalk, LONWORKS, and the LONMARK logo are managed, granted and used by LONMARK International under a license gr anted by

Echelon Corporation; Compliant Scroll from Copeland Corporation; E l ectroFin from AST ElectroFin Inc.; Modbus from Schneider Electric; FanTrol, MicroTech II, Open Choices, and SpeedTrol from McQuay International

2 IMM AGSD3

Page 3

Introduction

General Description

McQuay AGS air-cooled water chillers are complete, self-contained automatic refrigerating units that include the latest in engineered components arranged to provide a compact and efficient unit. Each unit is completely assembled, (except remote evaporator applications) factory wired, evacuated, charged, tested and comes complete and ready for installation. Each unit consists of two air-cooled condenser sections with integral subcooler sections, two semi-hermetic, singlescrew compressors with solid-state starters, a two-circuit shell-and-tube direct expansion evaporator, and complete refrigerant piping. Each compressor has an independent refrigeration circuit. Liquid line components included are manual liquid line shutoff valves, charging ports, filter-driers, sight-glass/moisture indicators, solenoid valves and electronic expansion valves. A discharge shutoff valve is included and a compressor suction shutoff valve is optional. Other features include compressor heaters, evaporator heaters for freeze protection, automatic one-time pumpdown of each refrigerant circuit upon circuit shutdown, and an advanced fully integrated microprocessor control system.

AGS units are available as standard efficiency (model DS) and high efficiency units (DE). The high efficiency units have certain larger components to improve efficiency.

The units are optionally available with the evaporator shipped separately for remote mounting indoors.

Information on the operation of the unit MicroTech II controller is in the OM AGSD3 manual.

Nomenclature

A G S - XXX D S

Rotary Screw Compressor

Air-Cooled

Global

Nominal Tons

S=Standard Efficiency, Packaged Unit M=Standard Efficiency, Remote Evaporator E= High Efficiency, Packaged Unit F= High Efficiency, Remote Evaporator.

Design Vi ntage

Inspection

When the equipment is received, carefully check all items against the bill of lading to check for a complete shipment. Check all units for damage upon arrival. All shipping damage must be reported to the carrier and a claim must be filed with the carrier. Check the unit’s serial plate 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 shown on page

23.

IMM AGSD3 3

Page 4

Installation and Start-up

Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.

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.

Start-up by McQuayService is included on all units sold for installation within the USA and Canada and must be performed by them to initiate the standard limited product warranty. Two-week prior notification of start-up is required. The contractor should obtain a copy of the Start-up Scheduled Request Form from the sales representative or from the nearest office of McQuayService.

Escaping refrigerant can displace air and cause suffocation. Immediately evacuate and ventilate the equipment area. If the unit is damaged, follow Environmental Protection Agency (EPA) requirements. Do not expose sparks, arcing equipment, open flame or other ignition source to the refrigerant.

Handling

Avoid rough handling shock due to impact or dropping the unit. Do not push or pull the unit.

WARNING

Never allow any part of the unit to fall during unloading or moving, as this can result in serious damage.

To lift the unit, lifting tabs with 2½" (64 mm) diameter holes are provided on the base of the unit. All lifting holes must be used when lifting the unit. Spreader bars and cables should be arranged to prevent damage to the condenser coils or unit cabinet (see

DANGER

Improper lifting or moving unit can result in property damage, severe personal injury or death. Follow rigging and moving instructions carefully

Figure 1).

Figure 1, Required Lifting Method

NOTES:

1. All rigging points on a unit must be used. See location and weights at lifting points beginning on page unit.

2. Crosswise and lengthwise spreader bars must be used to avoid damage to unit. Lifting cables from the unit mounting holes up must be vertical.

3. The number of condenser sections, and fans can vary from this diagram.

23 for a specific size

4 IMM AGSD3

Page 5

Location

Locate the unit carefully to provide proper airflow to the condenser. (See Figure 2on page 6 for required clearances).

Due to the shape of the condenser coils on the AGS chillers, it is recommended that the unit be oriented so that prevailing winds blow parallel to the unit length, thus minimizing the wind effect on condensing pressure and performance. If low ambient temperature operation is expected, optional louvers should be installed if the unit has no protection against prevailing winds.

Using less clearance than shown in condenser and could have a significant detrimental effect on unit performance.

See Restricted Airflow beginning on page For pad-mounted units, it is recommended that the unit be raised a few inches with suitable

supports, located at least under the mounting locations, to allow water to drain from under the unit and to facilitate cleaning under it

Figure 2 can cause discharge air recirculation to the

7 for further information.

Service Access

Compressors, filter-driers, and manual liquid line shutoff valves are accessible on each side or end of the unit. The evaporator heater is located on the barrel.

The control panels are located on the end of the chiller. The left-hand control box contains the unit and circuit microprocessors as well as transformers, fuses and terminal. The right-hand panel contains a circuit breaker and solid state starter for each compressor plus fuses, fan VFD (optional) and fan contactors. A minimum of four feet of clearance is required in front of the panels.

The side clearance required for airflow provides sufficient service clearance. On all AGS 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 must be removed for access to wiring terminals at the top of the motor.

WARNING

Disconnect, lockout and tag all power to the unit before servicing condenser fan motors or compressors. Failure to do so can cause bodily injury or death.

Do not block access to the sides or ends of the unit with piping or conduit. These areas must be open for service access. Do not block any access to the control panels with a field-mounted disconnect switches.

IMM AGSD3 5

Page 6

Clearance Requirements

Figure 2, Clearance Requirements

5ft (1.5m)if open fence or 50% open wall 6ft (1.8m)

4ft (1.2m) For electric panel access

if solid wall (see note 3 for pit)

No obstructions. Recommended area required for unit operation, air flow and maintenance access.

5ft (1.5m)if open fence or 50% open wall 6ft (1.8m)

if solid wall (see note 3 for pit)

See notes 2 & 4 concerning wall height at unit sides.

No obstructions allowed above unit at any height

Air Flow

3ft (1m) for service

See Note 5

Wall or Fence

Notes:

1. Minimum side clearance between two units is 12 feet (3.7 meters).

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 (2.4 meters) 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 6 feet (1.8 meters),

provided no solid wall above 6 feet (1.8 meters) is closer than 12 feet (3.7 meters) to the opposite side of the unit.

5. Do not mount electrical conduits where they can block service access to compressor controls, refrigerant

driers or valves.

6. There must be no obstruction of the fan discharge.

7. Field installed switches must not interfere with service access or airflow.

8. The evaporator can be removed from the side of the unit and may require the temporary removal of a

coil section support post. See dimension drawings beginning on page

9. If the airflow clearances cannot be met, see the following pages on Restricted Airflow.

25 for details.

6 IMM AGSD3

Page 7

Restricted Airflow

General

The clearances required for design operation of AGS air-cooled condensers are described in the previous section. Occasionally, these clearances cannot be maintained due to site restrictions such as units being too close together or a fence or wall restricting airflow, or both.

The McQuay AGS chillers have several features that can mitigate the problems attributable to restricted airflow.

• The shape of the condenser section allows inlet air for these coils to come in from both sides

and the bottom. All the coils on one side serve one compressor. Every compressor always has its own independent refrigerant circuit.

• The MicroTech II™ control is proactive in response to off-design conditions. In the case of

single or compounded influences restricting airflow to the unit, the microprocessor will act to keep the compressor(s) running (at reduced capacity) as long as possible, rather than allowing a shut-off on high discharge pressure.

Figure 3, Coil and Fan Arrangement

The following sections discuss the most common situations of condenser air restriction and give capacity and power adjustment factors for each. Note that in unusually severe conditions, the MicroTech II controller will adjust the unit operation to remain online until a less severe condition is reached.

IMM AGSD3 7

Page 8

Case 1, Building or Wall on One Side of One Unit

The existence of a screening wall, or the wall of a building, in close proximity to an air-cooled chiller is common in both rooftop and ground level applications. Hot air recirculation on the coils adjoining the wall will increase compressor discharge pressure, decreasing capacity and increasing power consumption.

When close to a wall, it is desirable to place chillers on the north or east side of them. It is also desirable to have prevailing winds blowing parallel to the unit’s long axis. The worst case is to have wind blowing hot discharge air into the wall.

Figure 4, Unit Adjacent to Wall

Figure 5, Adjustment Factors

5 ft.

(1.5m)

6 ft.

(1.8m)

5 ft.

(1.5m)

6 ft.

(1.8m)

8 IMM AGSD3

Page 9

Case 2, Two Units Side By Side

Two or more units sited side by side are common. If spaced closer than 12 feet (3.7 meters), or 8 feet (2.5 meters), depending on size, it is necessary to adjust the performance of each unit. Circuits adjoining each other are affected. NOTE: This case applies only to two units side by side. See Case 3 for three or more parallel units. If one of the two units also has a wall adjoining it, see Case 1. Add the two adjustment factors together and apply to the unit located between the wall and the other unit.

Mounting units end to end will not necessitate adjusting performance. Depending on the actual arrangement, sufficient space must be left between the units for access to the control panel door opening and/or evaporator tube removal. See “Clearance” section of this guide for requirements for specific units.

Figure 6, Two Units Side by Side

Figure 7, Adjustment Factor

3.0

2.0

1.0

(2.7)

(3.0)

(3.3)

(3.6)

6.0

4.0

2.0

(2.7)

(3.0)

(3.3)

(3.6)

IMM AGSD3 9

Page 10

Case 3, Three or More Units Side By Side

When three or more units are side by side, the outside units (chillers 1 and 3 in this case) are influenced by the middle unit only on their inside circuits. Their adjustment factors will be the same as Case 2. All inside units (only chiller 2 in this case) are influenced on both sides and must be adjusted by the factors shown below.

Figure 8, Three or More Units

Chiller 1 Chiller 2 Chiller 3

Figure 9, Adjustment Factor

4.0

3.0

2.0

1.0

(4.6)

(4.9)

(5.2)

(5.5)

8.0

6.0

4.0

2.0

(4.6)

(4.9)

(5.2)

(5.5)

10 IMM AGSD3

Page 11

Case 4, Open Screening Walls

Decorative screening walls are often used to help conceal a unit either on grade or on a rooftop. These walls should be designed such that the combination of their open area and distance from the unit do not require performance adjustment. It is assumed that the wall height is equal to or less than the unit height when mounted on its base support. This is usually satisfactory for concealment. If the wall height is greater than the unit height, see Case 5, Pit Installation.

The distance from the ends of the unit to the end walls must be sufficient for service, opening control panel doors, and pulling evaporator tubes, as applicable.

If each side wall is a different distance from the unit, the distances can be averaged, providing either wall is not less than 8 feet (2.4 meters) from the unit. For example, do not average 4 feet and 20 feet to equal 12 feet.

Figure 10, Open Screening Walls

Figure 11, Wall Free Area vs. Distance

IMM AGSD3 11

Page 12

Case 5, Pit/Solid Wall Installation

Pit installations can cause operating problems and great care must be exercised if they are to be used on an installation. Recirculation and restriction can both occur. A solid wall surrounding a unit is substantially the same as a pit and the data presented in this case should be used.

Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit. The grating material and installation design must be strong enough to prevent such accidents, yet provide abundant open area or serious recirculation problems will occur. Have any pit installation reviewed by the McQuay sales office prior to installation to discuss whether it has sufficient airflow characteristics. The installation design engineer must approve the work and is responsible for design criteria.

Figure 12, Pit Installation

Figure 13, Adjustment Factor

12 IMM AGSD3

Page 13

Vibration Isolator Location

Spring-Flex Locations

NOTE: See dimension drawings for mounting point location.

Table 1, Standard Efficiency with Aluminum Fin Condensers

Unit

Size

140DS to

170DS

190DS to

210DS

M1 M2 M3 M4 M5 M6

CP-2 CP-2 CP-2 CP-2 CP-2 CP-2

White White White White Gray Gray

CP-2 CP-2 CP-2 CP-2 CP-2 CP-2

White White White White White White

Table 2, High Efficiency with Aluminum Fin Condensers

Unit Size

149DE to

190DE

M1 M2 M3 M4 M5 M6

CP-2 CP-2 CP-2 CP-2 CP-2 CP-2

White White White White Gray Gray

Table 3, Standard Efficiency with Copper Fin Condensers

Unit Size

140DS to

210DS

CP-4 CP-4 CP-4 CP-4 CP-4 CP-4

Orange Orange Orange Orange Orange Orange

Mounting Location

Mounting Locations

M3 M4 M5 M6

Spring Kit

Number

330904106

330904126

Spring Kit

Number

330904126

Spring Kit

Number

330904127

Table 4, High Efficiency with Copper Fin Condensers

Unit Size

140DE to

210DE

M1 M2 M3 M4 M5 M6

CP-4 CP-4 CP-4 CP-4 CP-4 CP-4

Orange Orange Orange Orange Orange Orange

Mounting Locations

Spring Kit

Number

330904127

IMM AGSD3 13

Page 14

R-I-S Locations

NOTE: See dimension drawings for mounting point location.

Table 5, Standard Efficiency with Aluminum Fin Condensers

Unit Size

140DS to

210DS

1 2 3 4 5

RP-4 330904133 RP-4 RP-4 RP-4

Green Green Green Green Red

Table 6, High Efficiency with Aluminum Fin Condensers

Unit Size

140DE to

190DE

RP-4 RP-4 RP-4 RP-4 RP-4 RP-4

Green Green Green Green Red Red

Table 7, Standard Efficiency with Copper Fin Condensers

Unit Size

170DS to

210DS

1 2 3 4 5 6

RP-4 RP-4 RP-4 RP-4 RP-4 RP-4

Green Green Green Green Green Green

R-I-S Mountings

3 4 5 6

R-I-S Mountings

RP-4

Red

R-I-S Kit Number

330904133

R-I-S Kit Number

330904133

R-I-S Kit Number

330904125

Table 8, High Efficiency with Copper Fin Condensers

Unit Size

170DE to

190DE

1 2 3 4 5 6

RP-4 RP-4 RP-4 RP-4 RP-4 RP-4

Green Green Green Green Green Green

R-I-S Mountings

R-I-S Kit

Number

330904125

14 IMM AGSD3

Page 15

Figure 14,CP-4 Spring Flex Mounting Figure 15, RP-4 Rubber-in-Shear

Mounting

IMM AGSD3 15

Page 16

Chilled Water Pump

It is recommended that the chilled water pumps' starters be wired to, and controlled by, the chiller's microprocessor. The controller will energize the pump whenever at least one circuit on the chiller is enabled to run, whether there is a call for cooling or not. Wiring connection points are shown in Figure 22 on page 38.

Water Piping

Due to the variety of piping practices, follow the recommendations of local authorities. They can supply the installer with the proper building and safety codes required for a proper installation.

Design the piping 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 and 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 (i.e., expansion tank or regulating

valve).

5. Water temperature and pressure indicators located at the evaporator inlet and outlet to aid in

unit servicing. Any connections should be made prior to filling the system with water.

6. A strainer to remove foreign matter from the water before it enters the pump. Place the strainer

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.

NOTE: A 20 mesh strainer must 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 the evaporator and causing damage or decreasing its performance. Care must also be exercised if welding pipe or flanges to the evaporator connections to prevent any weld slag from entering the vessel.

7. Any water piping to the unit must be protected to prevent freeze-up if below freezing

temperatures are expected.

CAUTION

If a separate disconnect is used for the 115V supply to the unit, it should power the entire control circuit, not just the evaporator heaters. It should be clearly marked so that it is not accidentally shut off during cold seasons. Freeze damage to the evaporator could result. If the evaporator is drained for winter freeze protection, the heaters must be de-energized to prevent burnout.

8. If the unit is used as a replacement chiller on a previously existing piping system, flush the

system thoroughly prior to unit installation. Perform regular chilled water analysis and chemical water treatment immediately at equipment start-up.

16 IMM AGSD3

Page 17

9. In the event glycol is added to the water system as a late addition 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.

10. For ice making or low temperature glycol operation, a different freezestat pressure value is

usually required. The freezestat setting can be manually changed through the MicroTech II

controller. Make a preliminary leak check prior to insulating the water piping and filling the system. Include a vapor barrier with the piping insulation 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.

System Water Volume

All chilled water systems need adequate time to recognize a load change, respond to that load change and stabilize, without undesirable short cycling of the compressors or loss of control. In air conditioning systems, the potential for short cycling usually exists when the building load falls below the minimum chiller plant capacity or on close-coupled systems with very small water volumes.

Some of the things the designer should consider when looking at water volume are the minimum cooling load, the minimum chiller plant capacity during the low load period and the desired cycle time for the compressors.

Assuming that there are no sudden load changes and that the chiller plant has reasonable turndown, a rule of thumb of “gallons of water volume equal to two to three times the chilled water gpm flow rate” is often used.

A properly designed storage tank should be added if the system components do not provide sufficient water volume.

Variable Speed Pumping

Variable water flow involves reducing the water flow through the evaporator as the load decreases. McQuay chillers are designed for this duty, provided that the rate of change in water flow is slow, and the minimum and maximum flow rates for the vessel are not exceeded.

The recommended maximum change in water flow is 10 percent of the change per minute. The water flow through the vessel must remain between the minimum and maximum values listed

on page occur. If the flow exceeds the maximum rate, excessive pressure drop and tube erosion can occur.

22. If flow drops below the minimum allowable, large reductions in heat transfer can

IMM AGSD3 17

Page 18

Evaporator Freeze Protection

AGS chillers are equipped with thermostatically controlled evaporator heaters that help protect against freeze-up down to -20°F (-28°C).

NOTE: The heaters come from the factory connected to the control power circuit. The control power can be rewired in the field to a separate 115V supply (do not wire directly to the heater). See the field wiring diagram on page accidental deactivation of the heater during freezing temperatures. Exposed chilled water piping also requires protection.

For additional protection, at least one of the following procedures should be used during periods of sub-freezing temperatures:

1. Adding of a concentration of a glycol anti-freeze with a freeze point 10 degrees F below

the lowest expected temperature. This will result in decreased capacity and increased pressure drop.

Note: Do not use automotive grade antifreezes as they contain inhibitors harmful to chilled water systems. Use only glycols specifically designated for use in building cooling systems.

2. Draining the water from outdoor equipment and piping and blowing the chiller tubes dry

from the chiller. Do not

38. If this is done, mark the disconnect switch clearly to avoid

energize the chiller heater when water is drained from the vessel.

CAUTION

If fluid is absent from the evaporator, the evaporator heater must be de-energized to avoid burning out the heater and causing damage from the high temperatures.

3. Providing operation of the chilled water pump, circulating water through the chilled water

system and through the evaporator.

Table 9, Freeze Protection

Temperature

°F (°C)

20 (6.7) 16 18 11 12

10 (-12.2) 25 29 17 20

0 (-17.8) 33 36 22 24

-10 (-23.3) 39 42 26 28

-20 (-28.9) 44 46 30 30

-30 (-34.4) 48 50 30 33

-40 (-40.0) 52 54 30 35

-50 (-45.6) 56 57 30 35

-60 (-51.1) 60 60 30 35

Notes:

1. These figures are examples only and cannot be appropriate to every situation. Generally, for an extended margin of protection, select a temperature at least 15°F lower than the expected lowest ambient temperature. Inhibitor levels should be adjusted for solutions less than 25% glycol.

2. Glycol of less than 25% concentration is not recommended because of the potential for bacterial growth and loss of heat transfer efficiency.

Ethylene Glycol Propylene Glycol Ethylene Glycol Propylene Glycol

For Freeze Protection For Burst Protection

Percent Volume Glycol Concentration Required

18 IMM AGSD3

Page 19

Operating Limits:

Maximum standby ambient temperature, 130°F (55°C) Maximum operating ambient temperature, 125°F (51.7°C) Minimum operating ambient temperature (standard), 35°F (2°C) Minimum operating ambient temperature (optional low-ambient control), 0°F (-18°C) Leaving chilled water temperature, 40°F to 60°F (4°C to 16°C) Leaving chilled fluid range (with anti-freeze), 20°F to 60°F (-7°C to 16°C). Unloading is not

permitted with fluid leaving temperatures below 30°F (-1°C). Operating Delta-T range, 6 degrees F to 16 degrees F (10.8 C to 28.8 C) Maximum operating inlet fluid temperature, 76°F (24°C) Maximum startup inlet fluid temperature, 90°F (32°C) Maximum non-operating inlet fluid temperature, 100°F (38°C) NOTE: Contact the local McQuay sales office for operation outside any of these limits.

Two series of units are available with the AGS-D chillers.

Standard Efficiency,

model number following the “D” vintage designation (i.e. AGS 200DS

designated by a "S" (or “M” with remote evaporator) as the last digit in the

or AGS 200DM) are

designed to meet ASHRAE 90.1 efficiency standard. They provide the lowest dollar per ton price.

High Efficiency,

model number (i.e. AGS 200DE

designated by an "E" (or “F” with remote evaporator) as the last digit in the

or AGS 200DF) are designed for high efficiency operation. The high efficiency models have larger components, and/or more fans than the comparable standard efficiency models. This results in improved efficiency and the ability to operate at higher ambient air temperatures.

Flow Switch

A flow switch must be included in the chilled water system to prove that there is

Figure 16, Flow Switch

Flow direction

adequate water flow to the evaporator before the unit can start. It also serves to shut down the unit in the event that water flow is interrupted in order to guard against

1" (25mm) NPT flow

switch connection

Tee

evaporator freeze-up. A solid state flow switch that is factory-

mounted and wired in the chiller leaving water nozzle is available as an option.

A flow switch for field mounting and

1 1/4" (32mm) pipe

dia. min. before

switch

1 1/4" (32mm)

pipe dia. min.

wiring in the leaving chilled water is also available as an option from McQuay under ordering number 017503300. It is a paddletype 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 should be as shown in

Figure 17.

Table 10. Installation

Electrical connections in the unit control center should be made at terminals 60 and 67 from switch terminals Y and R. The normally open contacts of the flow switch should be wired between these

IMM AGSD3 19

Page 20

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) and have an insulation rating of 600 volts.

Table 10, Flow Switch Flow Rates

(NOTE)

Min.

Adjst.

Max.

Adjst.

Flow

Flow Lpm 11.4 22.9 35.9 38.6 Flow

Flow Lpm 27.7 53.4 81.8 90.8

NOTES:

1. A segmented 3-inch paddle (1, 2, and 3 inches) is furnished mounted, plus a 6-inch paddle loose.

2. Flow rates for a 3-inch paddle

3. Flow rates for a 6-inch paddle.

inch 4 5 6 8 Pipe Size

mm 102 (4) 127 (4) 153 (4) 204 (5)

gpm 65.0 125.0 190.0 205.0 Lpm 14.8 28.4 43.2 46.6 gpm 50.0 101.0 158.0 170.0

gpm 128.0 245.0 375.0 415.0 Lpm 29.1 55.6 85.2 94.3 gpm 122.0 235.0 360.0 400.0

Figure 17, Typical Field Water Piping

Suction

Vent

Out

Liquid

Drain

Notes:

1. Connections for vent and drain fittings are located on the top and bottom of the evaporator.

2. Piping must be supported to avoid putting strain on the evaporator nozzles.

Vibration

Eliminator

Valved

Pressure

Gauge

Flow

Switch

Vibration

Eliminator

Balancing

Valve

Water

Strainer

Gate

Valve

Flow

Gate

Valve

Protect All Field Piping

Flow

gainst Freezing

Refrigerant Charge

All packaged units are designed for use with R-134a and are shipped with a full operating charge. The operating charge for each unit is shown in the Physical Data Tables beginning on page packaged units, and page

53 for remote evaporator models. Model AGS-CM/CB with remote

23 for

evaporators are shipped with a full unit charge. Refrigerant must be added in the field for the evaporator and for the refrigerant lines.

Glycol Solutions

When using glycol anti-freeze solutions the chiller's capacity, glycol solution flow rate, and pressure drop through the evaporator can 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 11 for corrections when using propylene glycol and those in Table 12 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:

20 IMM AGSD3

Page 21

(

GPM

()( )

factorflowtons

)

−

TDelta

3. Pressure drop - To determine pressure drop through the evaporator when using glycol, enter

the water pressure drop curve at the water flow rate. Multiply the water pressure drop found there by the "PD" factor to obtain corrected glycol pressure drop.

4. Power - To determine glycol system kW, multiply the water sy stem kW by the factor

designated "Power".

Test coolant with a clean, accurate glycol solution hydrometer (similar to that found in service stations) to determine the freezing point. Obtain percent glycol from the freezing point table below. On glycol applications, the supplier normally recommends that a minimum of 25% solution by weight be used for protection against corrosion or that additional inhibitors should be employed.

NOTE: Do not use automotive antifreeze. Industrial glycols must be used. Automotive antifreeze contains inhibitors that will cause plating on the copper tubes within the chiller evaporator. The type and handling of glycol used must be consistent with local codes.

Table 11, Ethylene Glycol Factors

Freeze

E.G.

Point

oF o

26 -3.3 0.996 0.998 1.036 1.097

18 -7.8 0.988 0.994 1.061 1.219

7 -13.9 0.979 0.991 1.092 1.352

-7 -21.7 0.969 0.986 1.132 1.532

-28 -33.3 0.958 0.981 1.182 1.748

Capacity Power Flow PD

Water Flow and Pressure Drop

Adjust the chilled water flow through the evaporator to meet specified conditions. The flow rates must fall between the minimum and maximum values shown in the table on the following page. Flow rates below the minimum values shown will result in laminar flow that will reduce efficiency, cause erratic operation of the electronic expansion valve and could cause low temperature cutouts. On the other hand, flow rates exceeding the maximum values shown can cause erosion on the evaporator water connections and tubes.

Table 12, Propylene Glycol Factors

% P.G.

10 20 30 40 50

Freeze

Point

oF o

26 -3.3 0.991 0.996 1.016 1.092 19 -7.2 0.981 0.991 1.032 1.195

9 -12.8 0.966 0.985 1.056 1.345

-5 -20.6 0.947 0.977 1.092 1.544

-27 -32.8 0.932 0.969 1.140 1.906

Capacit

Power Flow PD

Measure the chilled water pressure drop through the evaporator at field-installed pressure taps. It is important not to include valve or strainer pressure drops in these readings.

IMM AGSD3 21

Page 22

Figure 18, Evaporator Pressure Drops

Minimum/Nominal/Maximum Flow Rates

AGS

MODEL

Standard Efficiency

140DS/DM A 201 3.72 12.7 11.1 321 8.51 20.2 25.4 535 21.18 33.7 63.2 160DS/DM A 233 4.83 14.7 14.4 372 11.16 23.5 33.3 621 27.74 39.2 82.8 170DS/DM A 246 15.5 2.8 8.4 393 24.8 6.8 20.3 655 41.3 20.5 61.2 190DS/DM B 200DS/DM B 283 4.49 17.9 13.4 453 10.42 28.6 31.1 756 26.24 47.7 78.3 210DS/DM B 302 4.99 19.0 14.9 483 11.63 30.4 34.7 804 29.29 50.7 87.4

High Efficiency

140DE/DF A 217 4.26 13.7 12.7 347 9.82 21.9 29.3 578 24.43 36.5 72.9 170DE/DF B 250 5.50 15.8 16.4 401 12.70 25.3 37.9 668 31.50 42.1 94.0 190DE/DF B 279 4.36 17.6 13.0 447 10.15 28.2 30.3 744 25.53 47.0 76.2

CURVE

22 IMM AGSD3

MINIMUM FLOW NOMINAL FLOW MAXIMUM FLOW

gpm ft l/s kpa gpm ft l/s kpa gpm ft l/s kpa

265 3.95 16.7 11.8 424 9.21 26.7 27.5 706 23.15 44.5 69.1

Page 23

Physical Data

Standard Efficiency

Table 13, Standard Efficiency, AGS 140DS – AGS 210DS

DATA

BASIC DATA

Unit Cap. @ ARI tons (kW) 137.0 (481.9) 155.2 (545.9) 163.7 (575.8) Unit Operating Charge lbs (kg) 170 (77) 170 (77) 170 (77) 170 (77) 170 (77) 170 (77) Cabinet Dimensions 229.2x88x100.1 229.2x88x100.1 229.2x88x100.1 L x W x H, in. (mm) (5821x2235x2542) (5821x2235x2542) (5821x2235x2542) Unit Operating Weight, lbs. (kg) 10990 (4985) 10990 (4985) 10990 (4985) Unit Shipping Weight, lbs (kg) 10415 (4724) 10415 (4724) 10415 (4724)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal Capacity, tons (kW) 70 (246) 70 (246) 70 (246) 85 (299) 85 (299) 85 (299) Minimum Capacity (% of Full Load) 12.5 12.5 12.5

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER

Pumpdown Capacity, lbs (kg) 399 (181) 399 (181) 399 (181) 399 (181) 399 (181) 399 (181) Coil Inlet Face Area, sq. ft. (sq m.) 131.8 (12.2) 131.8 (12.2) 131.8 (12.2) 131.8 (12.2) 131.8 (12.2) 131.8 (12.2)

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

No. of Fans/Circuit – 30 in. Fan Dia. 5 5 5 5 5 5 Fan Motor hp (kW) 2.0 (1.5) 2.0 (1.5) 2.0 (1.5) Fan & Motor RPM, 60Hz 1140 1140 1140 60 Hz Fan Tip Speed, fpm (m/s) 8950 (45.5) 8950 (45.5) 8950 (45.5) 60 Hz Total Unit Airflow, cfm (l/s) 108630 (51280) 108630 (51280) 108630 (51280)

EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE

Shell Dia.-Tube Length, in.(mm) 16x108 (406x2750) 16x108 (406x2750) 16x108 (406x2750) Water Volume, gallons (liters) 65.8 (249.4) 65.8 (249.4) 65.8 (249.4) Max. Water Pressure, psi (kPa) 152 (1048) 152 (1048) 152 (1048) Max. Refrigerant Press., psi (kPa) 350 (2413) 350 (2413) 350 (2413)

DATA

BASIC DATA

Unit Cap. @ ARI, tons (kW) 176.5 (620.8) 188.9 (664.4) 201.1 (707.4) Unit Operating Charge lbs (kg) 190 (86) 190 (86) 200 (91) 200 (91) 200 (91) 200 (91) Cabinet Dimensions 267.4x88x100.1 267.4x88x100.1 267.4x88x100.1 L x W x H, in. (mm) (6792x2235x2542) (6792x2235x2542) (6792x2235x2542) Unit Operating Weight (1), lbs. (kg) 11730 (5321) 11730 (5321) 11730 (5321) Unit Shipping Weight(1), lbs (kg) 11170 (5067) 11170 (5067) 11170 (5067)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal Capacity, tons (kW) 85 (299) 85 (299) 95 (335) 95 (335) 100 (352) 100 (352) Minimum Capacity (% of Full Load) 12.5 12.5 12.5

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE

Pumpdown Capacity, lbs (kg) 438 (199) 438 (199) 438 (199) 438 (199) 438 (199) 438 (199) Coil Inlet Face Area, sq. ft. (sq m.) 158.3 (14.7) 158.3 (14.7) 158.3 (14.7) 158.3 (14.7) 158.3 (14.7) 158.3 (14.7)

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

No. of Fans/Circuit – 30 in. Fan Dia 6 6 6 6 6 6 Fan Motor -- hp (kW) 2.0 (1.5) 2.0 (1.5) 2.5 (1.9) Fan & Motor RPM, 60Hz 1140 1140 1140 60 Hz Fan Tip Speed, fpm (m/s) 8950 (45.5) 8950 (45.5) 8950 (45.5) 60 Hz Total Unit Airflow, cfm (l/s) 130360 (61530) 130360 (61530) 137328 (64819)

EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE

Shell Dia.-Tube Length, in.(mm) 16x108 (406x2750) 16x108 (406x2750) 16x108 (406x2750) Water Volume, gallons (liters) 63.6 (241) 63.6 (241) 63.6 (241) Max. Water Pressure, psi (kPa) 152 (1048) 152 (1048) 152 (1048) Max. Refrigerant Press., psi (kPa) 350 (2413) 350 (2413) 350 (2413)

140DS 160DS 170DS

Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

190DS 200DS 210DS

Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

IMM AGSD3 23

Page 24

High Efficiency

Table 14, High Efficiency, AGS 140DE – AGS 190DE

DATA

BASIC DATA

Unit Cap. @ ARI tons (kW) 145.6 (512) 166.9 (586) 186.1 (654) Unit Operating Charge lbs (kg) 180 (82) 180 (82) 180 (82) 200 (91) 200 (91) 205 (93) Cabinet Dimensions 267.4x88x100.1 267.4x88x100.1 267.4x88x100.1 L x W x H, in. (mm) (6792x2235x2542) (6792x2235x2542) (6792x2235x2542) Unit Operating Weight, lbs. (kg) 11730 (5321) 11730 (5321) 11730 (5321) Unit Shipping Weight, lbs (kg) 11170 (5067) 11170 (5067) 11170 (5067)

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal Capacity, tons (kW) 70 (246) 70 (246) 70 (246) 85 (299) 85 (299) 95 (335) Minimum Capacity (% of Full Load) 12.5 12.5 12.5

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER

Pumpdown Capacity, lbs (kg)

Coil Inlet Face Area, sq. ft. (sq m.)

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

No. of Fans/Circuit – 30 in. Fan Dia. 6 6 6 6 6 6 Fan Motor hp (kW) 2.0 (1.5) 2.0 (1.5) 2.0 (1.5)

Fan & Motor RPM, 60Hz 1140 1140 1140 60 Hz Fan Tip Speed, fpm (m/s) 8950 (45.5) 8950 (45.5) 8950 (45.5) 60 Hz Total Unit Airflow, cfm (l/s) 130360 (61530) 130360 (61530) 130360 (61530)

EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE

Shell Dia.-Tube Length, in.(mm) 16x108 (406x2750) 16x108 (406x2750) 16x108 (406x2750) Water Volume, gallons (liters) 65.8 (249.4) 65.8 (249.4) 63.6 (241) Max. Water Pressure, psi (kPa) 152 (1048) 152 (1048) 152 (1048) Max. Refrigerant Press., psi (kPa) 350 (2413) 350 (2413) 350 (2413)

140DE 170DE 190DE

Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

438

(199)

158.3 (14.7)

438 (199) 438 (199) 438 (199) 438 (199) 438 (199)

158.3

(14.7)

158.3

(14.7)

158.3 (14.7)

24 IMM AGSD3

Page 25

M2M4M6

Dimensions & Weights

Standard Efficiency

Figure 19, Dimensions, AGS 140DS – 170DS

NOTES:

ISOLATOR MOUNTING HOLE LOCATIONS ON BOTTOM

1. SURFACE OF UNIT BASE LH EVAP SHOWN. RH OPTIONAL.2. CONNECTIONS OPPOSITE SIDE.3.

EVAPORATOR WATER CONNECTION SIZE IS 6" VICTAULIC.

CENTER OF ISOLATOR MOUNTING HOLE LOCATED 2.0IN5. FROM OUTSIDE EDGE OF UNIT BASE.

100.1

95.0

.875

FIELD CONTROL CONNECTIONS

38.8

COG

CONTROL

PANEL

.875

POWER KNOCKOUTS

COMP

CIRC #1

COMP

CIRC #2

.750

QTY.6

NOTE 1.

INLET OUTLET

EVAPORATOR

NOTE 2.

M1 M3 M5

L1 L3

25.6

40.5

COG

80.0

118.6

88.0 NOTE 5

86.0

55.9

NOTE 5

2.0

173.4

203.6

229.2

213.6

3.2

6.2

9.2

60.3

64.3

68.3

88.0

NOTE 3.& 4

AGS140-170DS - 10 FAN

ALL DIMENSIONS ARE IN DECIMAL INCHES

SCALE

NONE

3317178 00

17.1

REV.DRAWING NUMBER

Table 15, AGS140-170DS Shipping & Operating Weight, Center of Gravity Dimensions

Lifting Weights Mounting Weights COG Dimensions

AGS Model Type

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs lbs lbs lbs lbs lbs lbs (in.) (in.) (in.)

140-170DS Aluminum Fins 3231 1977 2142 1924 1429 10990 10415 90.95 39.07 44 140-170DS Copper Fins 3590 2593 2363 2218 1889 12940 12365 96.23 43.01 44

Operating

Weight

Shipping

Weight

X Y Z

IMM AGSD3 25

Page 26

Figure 20, Dimensions, AGS 190DS – 210DS

SCALE

NOTES:

ISOLATOR MOUNTING HOLE LOCATIONS

1. ON BOTTOM SURFACE OF UNIT BASE LH EVAP SHOWN. RH OPTIONAL.2. CONNECTIONS OPPOSITE SIDE.3. EVAPORATOR WATER CONNECTION SIZE IS 6" VICTAULIC.4. CENTER OF ISOLATOR MOUNTING HOLE LOCATED

2.0IN FROM OUTSIDE EDGE

100.1

95.0

.875 FIELD CONTROL KNOCKOUTS

38.8

COG

OF UNIT BASE.

CONTROL

PANEL

COMP

CIRC #1

COMP

CIRC #2

.750

QTY.6

NOTE 1.

.875

POWER

KNOCKOUTS

M1 M3

25.6

INLET OUTLET

EVAPORATOR

NOTE 2.

40.5

COG

80.0

118.6

193.5

217.7

213.6

88.0 NOTE 5

86.0

55.9

NOTE 5.

2.0

267.4

3.2

6.2

9.2

60.3

64.3

68.3

88.0

AGS190-210DS/AGS140-190DE - 12 FAN

ALL DIMENSIONS ARE IN DECIMAL INCHES

NOTE 3 & 4.

NON

*331717803001*

Table 16, AGS190-210DS Shipping & Operating Weight, Center of Gravity Dimensions

AGS Model Type

Lifting Weights Mounting Weights COG Dimensions L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

Operating

Weight

Shipping

Weight

X Y Z

lbs lbs lbs lbs lbs lbs lbs (in.) (in.) (in.)

190-210DS Aluminum Fins 3348 2237 2102 2005 1758 11730 11170 101.78 40.65 44 190-210DS Copper Fins 3714 2938 2301 2307 2322 13860 13305 108.08 44.42 44

17.1

26 IMM AGSD3

Page 27

High Efficiency

SCALE

Figure 21, Dimensions, AGS 140DE – 190DE

NOTES:

ISOLATOR MOUNTING HOLE LOCATIONS

1. ON BOTTOM SURFACE OF UNIT BASE LH EVAP SHOWN. RH OPTIONAL.2. CONNECTIONS OPPOSITE SIDE.3. EVAPORATOR WATER CONNECTION SIZE IS 6" VICTAULIC.4. CENTER OF ISOLATOR MOUNTING HOLE LOCATED

2.0IN FROM OUTSIDE EDGE

100.1

95.0

.875 FIELD CONTROL KNOCKOUTS

38.8

OF UNIT BASE.

CONTROL

COG

PANEL

M2 M4

COMP

CIRC #1

COMP

CIRC #2

M1 M3

.750

QTY.6

NOTE 1.

.875

POWER

KNOCKOUTS

25.6

40.5

80.0

COG

INLET OUTLET

EVAPORATOR

NOTE 2.

118.6

193.5

217.7

213.6

88.0 NOTE 5

86.0

55.9

NOTE 5.

2.0

267.4

3.2

6.2

9.2

60.3

64.3

68.3

88.0

NOTE 3 & 4.

AGS190-210DS/AGS140-190DE - 12 FAN

ALL DIMENSIONS ARE IN DECIMAL INCHES

NON

*331717803001*

Table 17, AGS140-190DE Shipping & Operating Weight, Center of Gravity Dimensions

Lifting Weights Mounting Weights COG Dimensions

AGS Model Type

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs lbs lbs lbs lbs lbs lbs (in.) (in.) (in.)

140-190DE Aluminum Fins 3348 2237 2102 2005 1758 11730 11170 101.78 40.65 44

140-190DE Copper Fins 3714 2938 2301 2307 2322 13860 13305 108.08 44.42 44

Operating

Weight

Shipping

Weight

X Y Z

17.1

IMM AGSD3 27

Page 28

Lifting, Mounting, and Total Weights

Vibration isolators are recommended for all roof-mounted installations or wherever vibration transmission is a consideration. Initially install the unit on shims or blocks at the illustrated "free height" of the isolator that is usually six inches for the McQuay isolators shown. When all piping, wiring, flushing, charging, etc. is complete, adjust the springs upward to load them and to provide clearance to free the blocks, which are then removed.

Installation of spring isolators requires flexible pipe connections and at least three feet of conduit flex tieins. Support piping and conduit independently from the unit to not stress connections.

There are separate weight and isolator tables for copper fin coils. All other coil types, such as ElectroFin and Blackfin, use the aluminum fin data.

NOTE: Dimensions for locating the mounting holes and lifting tabs are shown on the unit dimension drawings beginning on page

25.

Table ,18

AGS

Model

170DS 190DS 200DS 210DS

AGS

Model

170DE 190DE

Lifting, Mounting, and Total Weights, Packaged Unit, Aluminum Fins

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3231 1402 1977 858 2142 929 1924 835 1429 620 10990 4770 10415 4520 3348 1453 2237 971 2102 912 2005 870 1758 763 11730 5091 11170 4848 3348 1453 2237 971 2102 912 2005 870 1758 763 11730 5091 11170 4848 3375 1465 2293 995 2117 919 2028 880 1803 783 11895 5162 11335 4919

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3348 1453 2237 971 2102 912 2005 870 1758 763 11730 5091 11170 4848 3348 1453 2237 971 2102 912 2005 870 1758 763 11730 5091 11170 4848

Operating

Weight

Operating

Weight

Shipping

Weight

Shipping

Weight

Table 19, Lifting, Mounting and Total Weights, Packaged Unit, Copper Fins

AGS

Model

170DS 190DS 200DS 210DS

AGS

Model

170DE

190DE

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3590 1558 2593 1125 2363 1025 2218 963 1889 820 12940 5616 12365 5366 3714 1612 2938 1275 2301 999 2307 1001 2322 1008 13860 6015 13305 5774 3714 1612 2938 1275 2301 999 2307 1001 2322 1008 13860 6015 13305 5774 3742 1624 2993 1299 2317 1005 2331 1012 2367 1027 14030 6089 13470 5846

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3714 1612 2938 1275 2301 999 2307 1001 2322

100

Operating

Weight

Operating

Weight

13860 6015 13305 5774

Shipping Weight

28 IMM AGSD3

Page 29

Table 20, Lifting and Mounting Weights, Remote Evap, Aluminum Fins

AGS

Model

170DM 190DM 200DM 210DM

AGS

Model

170DF 190DF

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3235 1404 1362 591 2156 936 1785 775 944 410 9770 4240 9195 3991 3276 1422 1694 735 2082 903 1861 808 1304 566 10495 4555 9940 4314 3276 1422 1694 735 2082 903 1861 808 1304 566 10495 4555 9940 4314 3297 1431 1786 775 2091 908 1890 820 1381 599 10725 4655 10165 4412

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3276 1422 1694 735 2082 903 1861 808 1304 566 10495 4555 9940 4314 3276 1422 1694 735 2082 903 1861 808 1304 566 10495 4555 9940 4314

Operating

Weight

Operating

Weight

Shipping

Weight

Shipping

Weight

Table 21, Lifting and Mounting Weights, Remote Evap Copper Fins

AGS

Model

170DM 190DM 200DM 210DM

AGS

Model

170DF 190DF

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3591 1558 1982 860 2371 1029 2078 902 1411 613 11720 5086 11145 4837 3641 1580 2399 1041 2280 990 2166 940 1878 815 12650 5490 12080 5243 3348 1453 2237 971 2102 912 2005 870 1758 763 11730 5091 11170 4848 3662 1589 2490 1081 2287 993 2192 951 1951 847 12860 5581 12305 5340

Lifting Weights Mounting Weights

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg

3641 1580 2399 1041 2280 990 2166 940 1878 815 12650 5490 12080 5243 3641 1580 2399 1041 2280 990 2166 940 1878 815 12650 5490 12080 5243

Operating

Weight

Operating

Weight

Shipping

Weight

Shipping

Weight

IMM AGSD3 29

Page 30

Electrical Data

Field Wiring

General

Wiring must comply with all applicable codes and ordinances. Warranty does not cover damage to the equipment caused by wiring not complying 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.

AGS units can be ordered with main power wiring for either multiple-point power (standard) or single-point connection (optional).

If the standard multiple-point power wiring is ordered, two separate power connections are made to the disconnect switch on the power panel. See the dimension drawings beginning on page Separate disconnects are required for each electrical circuit if the McQuay optional factory-mounted disconnects are not ordered.

If the optional single-point power connection is ordered, a single power connection is made to a power block (or optional disconnect switch) in the unit power panel. A separate disconnect is required if the McQuay optional factory-mounted disconnect is not ordered. Isolation circuit breakers for each circuit are included.

23 for entry locations.

It can be desirable to have the unit evaporator heaters on a separate disconnect switch from the main unit power supply so that the unit power can be shut down without defeating the freeze protection provided by the evaporator heaters. See the field wiring diagram on page

38 for connection details.

The 115-volt control transformer is factory mounted and wired.

CAUTION

If a separate disconnect is used for the 115V supply to the unit, it must power the entire control circuit, not just the evaporator heaters. It must be clearly marked so that it is not accidentally shut off during cold seasons. Freeze damage to the evaporator could result. If the evaporator is drained for winter freeze protection, the heaters must be de-energized to prevent heater burnout.

CAUTION

AGS unit compressors are single-direction rotation compressors and can be damaged if rotated in the wrong direction. 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) for single or multiple point wiring arrangements. The solid-state starters contain phase reversal protection. DO NOT ALTER THE WIRING TO THE STARTERS.

30 IMM AGSD3

Page 31

Standard Efficiency

Table 22, Optional Single-Point Connection, Without Pump Package

AGS

UNIT

SIZE

140DS

160DS

170DS

190DS

200DS

210DS

Notes

1. Table based on 75°C field wire. Complete notes are on page

2. Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.

3. The AGS200DS/M is only available with a solid state starter for 208V and 230V applications. Wye-Delta starters are not available for 208V and

VOLTS

575 244 3 250 MCM 1 2.5 300 300 460 292 3 350 MCM 1 3.0 350 400 230 584 6 (2) 350 MCM 2 3.0 700 800 208 642 6 (2) 400 MCM 2 3.0 800 800 575 266 3 300 MCM 1 2.5 300 350 460 318 3 400 MCM 1 3.0 350 400 230 636 6 (2) 400 MCM 2 3.0 700 800 208 700 6 (2) 500 MCM 2 3.0 800 800 575 284 3 300 MCM 1 2.5 350 400 460 339 3 500 MCM 1 3.0 400 450 230 678 6 (2) 500 MCM 2 3.0 800 800 208 746 6 (2) 500 MCM 2 3.0 1000 1000 575 289 3 350 MCM 1 2.5 350 400 460 346 3 500 MCM 1 3.0 400 450 230 691 6 (2) 500 MCM 2 3.0 800 800 208 761 12 (2) 2-250 MCM 2 3.0 1000 1000 575 323 3 400 MCM 1 3.0 400 450 460 386 6 (2) 3/0 AWG 2 2.0 450 500 230 772 12 (2) 2-250 MCM 2 3.0 1000 1000 208 852 12 (2) 2-300 MCM 2 3.5 1000 1000 575 348 3 500 MCM 1 3.0 400 450 460 416 6 (2) 4/0 AWG 2 2.5 500 500

230V applications for this model. Model AGS 210DS/M is not available for 208/230 volt applications.

MIN. CIRCUIT

AMPACITY

(MCA)

FIELD WIRE

QTY WIRE GA QTY NOM. SIZE RECOM. MAX.

POWER SUPPLY

FIELD SUPPLIED

HUB (IN.)

37.

Table 23, Multiple-Point Connection, Without Pump Package

ELECTRICAL CIRCUIT 1 (COMPRESSOR 1) ELECTRICAL CIRCUIT 2 (COMPRESSOR 2)

FIELD FUSE OR

BREAKER SIZE

AGS UNIT SIZE

140DS

160DS

SIZE

FIELD FUSE

BREAKER

SIZE

REC. MAX.

MIN.

CIRCUIT

VOLTS

AMP-

ACITY (MCA)

575 134 3 1/0 AWG 1 1.5 175 225 134 3 1/0 AWG 1 1.5 175 225 460 160 3 2/0 AWG 1 2 200 250 160 3 2/0 AWG 1 2 200 250 230 321 3 400 MCM 1 3 400 500 321 3 400 MCM 1 3 400 500 208 353 3 500 MCM 1 3 450 600 353 3 500 MCM 1 3 450 600 575 134 3 1/0 AWG 1 1.5 175 225 157 3 2/0 AWG 1 1.5 200 250 460 160 3 2/0 AWG 1 2 200 250 187 3 3/0 AWG 1 2 225 300 230 321 3 400 MCM 1 3 400 500 373 3 500 MCM 1 3 450 600 208 353 3 500 MCM 1 3 450 600 411 6 (2) 4/0 AWG 2 2.5 500 700

POWER SUPPLY POWER SUPPLY

FIELD WIRE

QTY WIRE GA QTY

FIELD

SUPPLIED

HUB (IN.)

NOM.

MIN.

CIRCUIT

AMP-

ACITY

(MCA)

FIELD WIRE

QTY WIRE GA QTY

SUPPLIED

HUB (IN.)

FIELD

NOM.

SIZE

FIELD

FUSE OR

BREAKER

SIZE

REC. MAX.

(Continued next page.)

IMM AGSD3 31

Page 32

Multiple-Point Connection, no pump package (continued)

ELECTRICAL CIRCUIT 1 (COMPRESSOR 1) ELECTRICAL CIRCUIT 2 (COMPRESSOR 2)

NOM.

SIZE

FIELD FUSE

BREAKER

SIZE

REC. MAX.

37.

MIN.

CIRCUIT

AMPACITY

(MCA)

FIELD WIRE

QTY WIRE GA QTY

SUPPLIED

HUB (IN.)

FIELD

NIT

VOLTS

IZE

575 157 3 2/0 AWG 1 1.5 200 250 157 3 2/0 AWG 1 1.5 200 250

70DS

90DS

00DS

10DS

460 187 3 3/0 AWG 1 2 225 300 187 3 3/0 AWG 1 2 225 300 230 373 3 500 MCM 1 3 450 600 373 3 500 MCM 1 3 450 600 208 411 6 (2) 4/0 AWG 2 2.5 500 700 411 6 (2) 4/0 AWG 2 2.5 500 700 575 159 3 2/0 AWG 1 1.5 200 250 159 3 2/0 AWG 1 1.5 200 250 460 190 3 3/0 AWG 1 2 225 300 190 3 3/0 AWG 1 2 225 300 230 380 3 500 MCM 1 3 450 600 380 3 500 MCM 1 3 450 600 208 418 6 (2) 4/0 AWG 2 2.5 500 700 418 6 (2) 4/0 AWG 2 2.5 500 700 575 178 3 3/0 AWG 1 2 225 300 178 3 3/0 AWG 1 2 225 300 460 212 3 4/0 AWG 1 2 300 350 212 3 4/0 AWG 1 2 300 350 230 425 6 (2) 4/0 AWG 2 2.5 600 700 425 6 (2) 4/0 AWG 2 2.5 600 700 208 469 6 (2) 250 MCM 2 2.5 600 800 469 6 (2) 250 MCM 2 2.5 600 800 575 191 3 3/0 AWG 1 2 250 300 191 3 3/0 AWG 1 2 250 300 460 228 3 4/0 AWG 1 2 300 350 228 3 4/0 AWG 1 2 300 350

Notes

1. Table based on 75°C field wire. Complete notes are on page

2. Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.

3. The AGS200DS/M is only available with a solid state starter for 208V and 230V applications. Wye-Delta starters are not available for 208V and 230V applications for this model. Model AGS 210DS/M is not available for 208/230 volt applications.

MIN.

CIRCUIT

AMPACITY

(MCA)

QTY WIRE GA QTY

POWER SUPPLY POWER SUPPLY

FIELD WIRE

FIELD

SUPPLIED

HUB (IN.)

NOM.

SIZE

FIELD FUSE

BREAKER

SIZE

REC. MAX.

Table 24, Std. Efficiency, Compressor and Condenser Fan Motor Amp Draw

AGS UNIT SIZE

140DS

160DS

170DS

190DS

(Continued next page)

VOLTS

CIRC. #1 CIRC. #2

575 98 98 10 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 115 115 10 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 230 230 10 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 253 253 10 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352 575 98 116 10 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 115 136 10 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 230 272 10 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 253 299 10 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352 575 116 116 10 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 136 136 10 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 272 272 10 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 299 299 10 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352 575 116 116 12 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 136 136 12 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 272 272 12 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 299 299 12 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352

RATED LOAD

AMPS

NO. OF

FAN

MTRS

FAN

MTRS

FLA

(EA)

FAN

MTRS

LRA (EA)

Solid State Wye-Delta

Inrush / LRA (Note X) LRA CIRC. #1 CIRC. #2 CIRC. #1 CIRC. #2

32 IMM AGSD3

Page 33

Std. Efficiency, Compressor and Condenser Fan Motor Amp Draw (Continued)

AGS

UNIT

SIZE

200DS

210DS

Notes:

1. For solid state starters, inrush amps are determined by the solid state starter.

2. Table based on 75°C field wire.

3. Complete notes are on page

4. The AGS200DS/M is only available with a solid state starter for 208V and 230V applications.

5. Model AGS 210DS/M is not available for 208/230 volt applications.

VOLTS

RATED LOAD AMPS

CIRC. #1 CIRC. #2

575 131 131 12 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 154 154 12 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 308 308 12 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 340 340 12 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352 575 139 139 12 3 20.0 297 / 821 297 / 821 257 / 821 257 / 821 460 163 163 12 4.1 23.0 349 / 893 349 / 893 288 / 893 288 / 893

37.

NO. OF

FAN

MTRS

FAN

MTRS

FLA (EA)

FAN

MTRS

LRA (EA)

Solid State Wye-Delta

Inrush / LRA (Note X) LRA

CIRC. #1 CIRC. #2 CIRC. #1 CIRC. #2

Table 25, Standard Efficiency, Customer Wiring Information with Single-Point Power

POWER BLOCK

AGS UNIT SIZE

VOLTS

140DS

160DS

170DS

190DS

200DS

210DS

Notes:

1. Terminal size amps are the maximum amps that the power block is rated for.

2. Complete notes are on page

3. Data based on 75°C wire.

4. Model AGS 210DS/M is not available for 208/230 volt applications.

(Std. Short Circuit Current Rating)

TERMINAL

SIZE AMPS

575 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 400 #3/0-500kcmil (2/PH) 460 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 500 #3/0-500kcmil(2/PH) 230 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1000 250-500kcmil (4/PH) 208 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1200 250-500kcmil (4/PH) 575 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 450 #3/0-500kcmil(2/PH) 460 380 #4 - 500kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 600 #3/0-500kcmil(2/PH) 230 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1200 250-500kcmil(4/PH) 208 1400 1/0 - 750kcmil (4/PH) 1200 250-500kcmil (4/PH) 1400 300-600kcmil(5/PH) 575 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 500 #3/0-500kcmil(2/PH) 460 380 #4 - 500kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 600 #3/0-500kcmil(2/PH) 230 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1200 250-500kcmil(4/PH) 208 1400 1/0 - 750kcmil (4/PH) 1200 250-500kcmil (4/PH) 1400 300-600kcmil(5/PH) 575 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 500 #3/0-500kcmil(2/PH) 460 620 #6 - 500kcmil (2/PH) 400 #3/0-500kcmil (2/PH) 600 #3/0-500kcmil(2/PH) 230 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1200 250-500kcmil(4/PH) 208 1400 1/0 - 750kcmil (4/PH) 1200 250-500kcmil (4/PH) 1400 300-600kcmil(5/PH) 575 380 #4 - 500kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 600 #3/0-500kcmil(2/PH) 460 620 #6 - 500kcmil (2/PH) 600 #3/0-500kcmil (2/PH) 700 #1/0 - 500kcmil(3/PH) 230 1400 #1 - 500kcmil (2/PH) 1200 250-500kcmil (4/PH) 1400 300-600kcmil(5/PH) 208 1400 1/0 - 750kcmil (4/PH) 1200 250-500kcmil (4/PH) 1400 300-600kcmil(5/PH) 575 620 #6 - 500kcmil (2/PH) 600 #3/0-500kcmil (2/PH) 600 #3/0-500kcmil(2/PH) 460 620 #6 - 500kcmil (2/PH) 600 #3/0-500kcmil (2/PH) 700 #1/0 - 500kcmil(3/PH)

CONNECTION LUG

RANGE PER PHASE

37.

DISCONNECT SWITCH

(Std. Short Circuit Current Rating)

TERMINAL

SIZE

AMPS

CONNECTION LUG

RANGE PER PHASE

DISCONNECT SWITCH (High

Interrupt or High Short Circuit

Current Rating)

TERMINAL

SIZE AMPS

CONNECTION LUG

RANGE PER PHASE

IMM AGSD3 33

Page 34

Table 26, Standard Efficiency, Wiring w/ Std. Multi-Point Disconnect Switches

DISCONNECT SW-CIRCUIT #1 DISCONNECT SW-CIRCUIT #2

CONNECTION LUG

RANGE PER PHASE

37.

TERMINAL

SIZE AMPS

CONNECTION LUG

RANGE PER PHASE

AGS UNIT

SIZE

140DS

160DS

170DS

190DS

200DS

210DS

NOTES:

VOLTS

575 225 #6 - 350 kcmil Cu 225 #6 - 350 kcmil Cu 460 300 #3/0 - 500 kcmil Cu (2/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 230 600 #3/0 - 500 kcmil Cu (2/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 208 600 #3/0 - 500 kcmil Cu (2/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 575 200 #6 - 350kcmil (1/PH) 225 #6 - 350 kcmil Cu 460 225 #6 - 350kcmil (1/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 230 450 #3/0-500kcmil(2/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 208 500 #3/0-500kcmil(2/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 575 300 #3/0 - 500 kcmil Cu (2/PH) 225 #6 - 350 kcmil Cu 460 350 #3/0 - 500 kcmil Cu (2/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 230 700 #1/0 - 500 kcmil (3/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 208 700 #1/0 - 500 kcmil (3/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 575 300 #3/0 - 500 kcmil Cu (2/PH) 225 #6 - 350 kcmil Cu 460 350 #3/0 - 500 kcmil Cu (2/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 230 700 #1/0 - 500 kcmil (3/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 208 700 #1/0 - 500 kcmil (3/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 575 300 #3/0 - 500 kcmil Cu (2/PH) 250 #6 - 350 kcmil Cu 460 350 #3/0 - 500 kcmil Cu (2/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 230 700 #1/0 - 500 kcmil (3/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 208 800 #1/0 - 500 kcmil (3/PH) 700 #1/0 - 500 kcmil (3/PH) 575 350 #3/0 - 500 kcmil Cu (2/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 460 400 #3/0 - 500 kcmil Cu (2/PH) 350 #3/0 - 500 kcmil Cu (2/PH)

1. Terminal size amps are the maximum amps that the power block is rated for.

2. Complete notes are on page

3. Data based on 75°C wire.

4. Model AGS 210DS/M is not available for 208/230 volt applications.

TERMINAL

SIZE AMPS

34 IMM AGSD3

Page 35

High Efficiency

Table 27, High Efficiency, Electrical Data, Optional Single-Point

AGS UNIT SIZE

140DE

170DE

190DE

Notes

1. Table based on 75°C field wire.

2. Complete notes are on page

3. Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.

VOLTS

MIN. CIRCUIT

AMPACITY

(MCA)

575 249 3 250 MCM 1 2.5 300 300 460 298 3 350 MCM 1 3 350 400 230 597 6 (2) 350 MCM 2 3 700 800 208 657 6 (2) 400 MCM 2 3 800 800 575 271 3 300 MCM 1 2.5 300 350 460 325 3 400 MCM 1 3 350 400 230 649 6 (2) 400 MCM 2 3 700 800 208 715 6 (2) 500 MCM 2 3 800 800 575 308 3 350 MCM 1 2.5 350 400 460 368 3 500 MCM 1 3 400 500 230 736 6 (2) 500 MCM 2 3 800 800 208 812 12 (2) 2-250 MCM 2 3 1000 1000

37.

FIELD WIRE FIELD SUPPLIED HUB (IN.)

QTY WIRE GA QTY NOM. SIZE RECOM. MAX.

POWER SUPPLY

Table 28, High Efficiency, Electrical Data, Standard Multi-Point Connection

ELECTRICAL CIRCUIT 1 (COMPRESSOR 1) ELECTRICAL CIRCUIT 2 (COMPRESSOR 2)

FIELD FUSE OR BREAKER SIZE

AGS UNIT SIZE

VOLTS

575 137 3 1/0 AWG 1 1.5 175 225 137 3 1/0 AWG 1 1.5 175 225

140DE

170DE

190DE

Notes:

1. Table based on 75°C field wire.

2. Complete notes are on page

3. Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.

460 164 3 2/0 AWG 1 1.5 200 250 164 3 2/0 AWG 1 1.5 200 250 230 327 3 400 MCM 1 3.0 400 500 327 3 400 MCM 1 3.0 400 500 208 360 3 500 MCM 1 3.0 450 600 360 3 500 MCM 1 3.0 450 600 575 137 3 1/0 AWG 1 1.5 175 225 159 3 2/0 AWG 1 1.5 200 250 460 164 3 2/0 AWG 1 1.5 200 250 190 3 3/0 AWG 1 2 225 300 230 327 3 400 MCM 1 3.0 400 500 380 3 500 MCM 1 3 450 600 208 360 3 500 MCM 1 3.0 450 600 418 6 (2) 4/0 AWG 2 2.5 500 700 575 159 3 2/0 AWG 1 1.5 200 250 178 3 3/0 AWG 1 2 225 300 460 190 3 3/0 AWG 1 2.0 225 300 212 3 4/0 AWG 1 3.5 300 350 230 380 3 500 MCM 1 3.0 450 600 425 6 (2) 4/0 AWG 2 2.5 600 700

208 418 6

MIN.

CIRCUIT

AMPACITY

(MCA)

POWER SUPPLY POWER SUPPLY

FIELD WIRE

QTY WIRE GA QTY

(2) 4/0

AWG

37.

FIELD

SUPPLIED

HUB (IN.)

NOM.

2 2.5 500 700 469 6 (2) 250 MCM 2 2.5 600 800

SIZE

FIELD FUSE

OR.

BREAKER

SIZE

REC. MAX.

MIN.

CIRCUIT

AMPACITY

(MCA)

FIELD WIRE

QTY WIRE GA QTY

FIELD

SUPPLIED

HUB (IN.)

NOM.

SIZE

FIELD FUSE

OR.

BREAKER

SIZE

REC. MAX.

IMM AGSD3 35

Page 36

Table 29, High Efficiency, Compressor and Condenser Fan Motor Amp Draw

AGS UNIT SIZE

140DE

170DE

190DE

Notes:

1. Table based on 75°C field wire.

2. For solid state starters, inrush amps are determined by the solid state starter.

3. Complete notes are on page on page

VOLTS

RATED LOAD AMPS

CIRC. #1

575 98 98 12 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 115 115 12 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 230 230 12 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 253 253 12 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352 575 98 116 12 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 115 136 12 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 230 272 12 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 253 299 12 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352 575 116 131 12 2.4 12.8 297 / 821 297 / 821 257 / 821 257 / 821 460 136 154 12 3.3 20.0 349 / 893 349 / 893 288 / 893 288 / 893 230 272 308 12 6.6 40.0 698 / 1852 698 / 1852 579 / 1852 579 / 1852 208 299 340 12 7.3 40.0 768 / 2352 768 / 2352 735 / 2352 735 / 2352

CIRC.

NO. OF

FAN

MTRS

37.

FAN

MTRS

FLA (EA)

FAN

MTRS

LRA (EA)

Solid State

Inrush / LRA (Note X)

CIRC.

Wye-Delta

CIRC.

Table 30, High Efficiency, Customer Wiring Information, Optional Single-Point Power

POWER BLOCK DISCONNECT SWITCH

AGS

UNIT

VOLTS

SIZE

575 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 400 #3/0-500kcmil(2/PH)

140DE

170DE

190DE

Notes:

1. Terminal size amps are the maximum amps that the power block is rated for.

2. Complete notes are on page

3. Data based on 75°C wire.

460 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 500 #3/0-500kcmil(2/PH) 230 620 #6 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1000 250-500kcmil(4/PH) 208 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1000 250-500kcmil(4/PH) 575 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 450 #3/0-500kcmil(2/PH) 460 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 500 #3/0-500kcmil(2/PH) 230 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1000 250-500kcmil(4/PH) 208 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1200 250-500kcmil(4/PH) 575 335 #6 - 400kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 500 #3/0-500kcmil(2/PH) 460 380 #4 - 500kcmil (1/PH) 400 #3/0-500kcmil (2/PH) 600 #3/0-500kcmil(2/PH) 230 760 #2 - 500kcmil (2/PH) 800 #1-500kcmil (3/PH) 1200 250-500kcmil(4/PH) 208 1400 1/0 - 750kcmil (4/PH) 800 #1-500kcmil (3/PH) 1200 250-500kcmil(4/PH)

(Std. Short Circuit Current Rating) (Std. Short Circuit Current Rating)

TERMINAL

SIZE AMPS

CONNECTION LUG

RANGE PER PHASE

37.

TERMINAL SIZE AMPS

CONNECTION LUG

RANGE PER PHASE

DISCONNECT SWITCH (High

Interrupt or High Short Circuit

Current Rating)

TERMINAL

SIZE AMPS

CONNECTION LUG

RANGE PER PHASE

LRA

CIRC.

36 IMM AGSD3

Page 37

Table 31, High Efficiency, Wiring w/ Standard Multi-point Power and Disconnect Switches

AGS

UNIT SIZE

140DE

170DE

190DE

Notes:

1. Terminal size amps are the maximum amps that the power block is rated for.

2. Complete notes are on page

3. Data based on 75°C wire.

VOLTS

575 200 #6 - 350 kcmil Cu (1/PH) 200 #6 - 350 kcmil Cu (1/PH) 460 250 #6 - 350 kcmil Cu (1/PH) 250 #6 - 350 kcmil Cu (1/PH) 230 500 #3/0 - 500 kcmil Cu (2/PH) 500 #3/0 - 500 kcmil Cu (2/PH) 208 500 #3/0 - 500 kcmil Cu (2/PH) 500 #3/0 - 500 kcmil Cu (2/PH) 575 200 #6 - 350 kcmil Cu (1/PH) 225 #6 - 350 kcmil Cu (1/PH) 460 250 #6 - 350 kcmil Cu (1/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 230 500 #3/0 - 500 kcmil Cu (2/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 208 500 #3/0 - 500 kcmil Cu (2/PH) 700 #3/0 - 500 kcmil Cu (2/PH) 575 225 #6 - 350 kcmil Cu (1/PH) 225 #6 - 350 kcmil Cu (1/PH) 460 300 #3/0 - 500 kcmil Cu (2/PH) 300 #3/0 - 500 kcmil Cu (2/PH) 230 600 #3/0 - 500 kcmil Cu (2/PH) 600 #3/0 - 500 kcmil Cu (2/PH) 208 600 #3/0 - 500 kcmil Cu (2/PH) 700 #3/0 - 500 kcmil Cu (2/PH)

DISCONNECT SW-CIRCUIT #1 DISCONNECT SW-CIRCUIT #2

TERMINAL

SIZE

AMPS

CONNECTION LUG

RANGE PER PHASE

37.

TERMINAL

SIZE

AMPS

CONNECTION LUG

RANGE PER PHASE

Electrical Data Notes

1. The field wire size designation is explained in the table to the right that defines the number of wires and conduit recommended. A “2” in parenthesis (2) indicates that two conduits are required.

2. Allowable voltage limits Unit nameplate 208V/60Hz/3PH: 187V to 229V Unit nameplate 230V/60Hz/3Ph: 207V to 253V Unit nameplate 460V/60Hz/3Ph: 414V to 506V Unit nameplate 575V/60Hz/3Ph: 517V to 633V Maximum of 2 percent voltage unbalance.

3. 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. Wire size ampacity for separate 115V control circuit power is 15 amps.

4. Compressor RLA values are for wire sizing purposes only but do reflect normal operating current draw at unit rated capacity.

5. Single point power supply requires a single disconnect to supply electrical power to the unit.

6. Multiple point power supply requires two independent power circuits.

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.

9. External disconnect switches or breakers must be field supplied. Note: On single point power units a non-fused disconnect switch in the cabinet is available as an option.

10. All wiring must be done in accordance with applicable local and national codes.

11. Recommended time delay fuse size or breakers is equal to 175% 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 breakers is equal to 225% of the largest compressor-motor RLA plus 100% of remaining compressor RLAs and the sum of condenser fan FLAs.

Power Limitations:

1. Voltage within ± 10 percent of nameplate rating.

2. Voltage unbalance not to exceed 2% with a resultant current unbalance of 6 to 10 times the voltage unbalance per NEMA MG-1, 1998 Standard.

Sample No. of Wires No. of Conduit

350 MCM 3 1

2-250 MCM 6 1

(2) 250 MCM 6 2

(2) 2-250 MCM 12 2

BAS Interface

Optional Open Choices™ BAS interfaces: the locations and interconnection requirements for the various standard protocols are found in their respective installation manuals, obtainable from the local McQuay sales office, www.mcquay.com, and also shipped with each unit.

Modbus IM 743 L

IMM AGSD3 37

ONWORKS IM 735 BACnet IM 736

Page 38

Field Wiring Diagram

Figure 22, Typical Field Wiring Diagram

Continued next page Continued nex

page

38 IMM AGSD3

Page 39

Typical Field Wiring Diagram, Continued

Continued from previous page Continued from previous page

IMM AGSD3 39

Page 40

Figure 23, AGS 120C - 210C Unit Controller Schematic

OUTSIDE AIR TEMP (S07)

DEMAND LIMIT (S10)

EVAP. WATER TEMP. RESET (S11)

EVAP. LEAVING WATER TEMP (S08)

EVAP. ENTERING WATER TEMP (S09)

813

812

J11

J12

B-

A+

GND

NO1

NO2

NO3

BLACK WHITE GROUND

EVAPORATOR PUMP 1

EVAPORATOR PUMP 2

803

804 805

806 814

BLK

RED

BLK

RED

801

802

GND +VDC

B4 BC4

B5 BC5

800

SHIELD

BLK RED

4-20MA 4-20MA

SHIELD

NO4

J13

DIGITAL OUTPUTS

J14

J15

NO5

NO6

NO7

NO8

NC8

UNIT ALARM

UNIT SWITCH

REMOTE SWITCH

EVAP. FLOW SWITCH

MODE SWITCH

FACTORY INSTALLED

FLOW SWITCH

897

BLU

800

RS1

WHTBRN

807

CHWI

MS1

60 67

808

809

810

811

ID1

ID2

ID3

ID4

ID5

ID6

ID7

ID8

IDC1

CONTROLLER

40 IMM AGSD3

Page 41

Unit Controller Schematic Continued

FU12

890

115V OUTLET

850

853

(p LAN) TO CIRCUIT CONTROL BOXES

BLACK

WHITE GROUND

(TERMINATE A T EACH CONTROLLER)

EVAPORATOR PUMP 1

EVAPORATOR PUMP 2

UNIT ALARM

FU11

FU10

LINE 1

LOAD 1

822

823

824

829

830

REC

851

1 2

854

120V

526

24V

(SEE LINE 301)

(SEE LINE 307)

HTR-EVAP

LINE 2

LOAD 2

ABR

891

HEATER

C-BOX

HEATER

CHWR

SCHEM. 330590301 REV. 0D

120V

852

855

VFD ONLY

821820

(SEE LINE 306)

LINE

LOCATION

-301

-302

-303

-304

-305

-306

-307

-308

-309

-310

-311

-312

-313

-314

-315

-316

-317

-318

-319

-320

-321

-322

-323

-324

-325

-326

-327

-328

-329

-330

-331

-332

-333

-334

-335

-336

-337

-338

-339

-340

-341

-342

-343

-344

-345

-346

-347

-348

-349

-350

-351

-352

-353

-354

-355

-356

-357

-358

-359

-360

-361

-362

-363

-364

CONTACT

NO.

TERMINAL BLOCK

ND LEAD NUMBERS

TB1

820, 822, 85

853, 890

821, 891

852, 855 801, 807

897, 830

812

800, 802, 81

75 60

2 2

897, 809

810

67 68

811

69 803 70

806

804

805

814

73 81

829

823

851, F2-283

854, F3-2 824

NOTE: TB1-75 THRU

TB1-89 ARE FIELD

WIRING TERMINALS.

IMM AGSD3 41

Page 42

Figure 24, AGS 120C - 210C Circuit Controller Schematic

(SEE LINE 693) TO T5

122

EVAP PRESS TRANSDUCER (S01)

0-5 VDC

SLIDE LOAD

INDICATOR

RED

WHT

BLK

DISCHARGE PRESS TRANSDUCER (S02)

RED

WHT

BLK

21 VDC

DC GROUND

SUCTION TEMP. (S04) DISCHARGE TEMP. (S05)

N/A ON NON-VFD UNITS

140

FAN VFD

EXV DRIVER

(SEE DETAIL 1)

CIRCUIT SWITCH

STARTER FAULT

VFD FAULT

142

TB1-

127

164

DIFFERENTIAL PRESSURE SWITCH

MECHANICAL HIGH PRESSURE FAULT

SLIDE LOAD

INDICATOR

4-20MA

220

GREEN

DETAIL 2 - THERMISTOR CARD

MOTOR

J3-1

GUARDISTOR

170 171

1 2

LP*

REMOTE EVAP. ONLY. IN SERIES WITH 170

NOTES: 1) * - REPRESENTS CIRCUIT

2) ONE HUNDRED SERIES FOR CIRCUIT #1

3) TWO HUNDRED SERIES FOR CIRCUIT #2

116

114 113 120

BIAS 5

BIAS G

0-10VDC

TB1-

164

N/A ON NON-VFD UNITS

142

GRN

BLK

130

OLS

J3-2

25 26

SCOM

FLT

COM NO

143

DPS

C 1

MHPR

2 4

120V

SHIELD

SA-

SB+

SHLD

165

24V

RED BLK

RED

WHT

121

882 883 137 138

TB191

165

TB1-

143 143

139 (SEE LINE 687)

123

J1 J2

1 3

124 125

141

126

BLACK WHITE GREEN

128

165

129

131

132

133

134

135

136

ID13H

IDC13

ID14H

B4 BC4

B5 BC5

VG VGD

Y1 Y2 Y3

ID1 ID2

ID3

ID4

ID5

ID6

ID7 ID8

IDC1

GND

ID9

ID10

ID11

ID12

IDC9

ID13

ID14

(LOWER LEVEL)

CONTROLLER

GND A+

B-

J11

J12

GND

NO1

NO2

NO3

120

OHMS

FAN 1

N/A ON VFD UNIT

FAN 2

FAN 3

FAN 4

NO4

NO5

NO6

NO7

FAN 5

FAN 6

J13

OUTPUTS

DIGITA L

J14

MJ MJ

NO8

J15

NC8

COMPRESSOR

NO9

SSS CONTACT

NO10

J16

OIL SEP.

NO11

HEATER

NO12

J17

NC12

NO13

J18

NC13

C12

C13

18840

185

42 IMM AGSD3

Page 43

Circuit Controller Schematic Continued

33059040

(

)

103

115V

FIELD INSTALLED ON REMOTE EVAPORATOR

120V

FU7

102 101

2 1

D3 CARD

910

174

105

(p LAN) TO OTHER CIRCUIT CONTROLLERS AND UNIT CONTROLLER

BLACK

(RESISTOR USED ONLY A T END OF DAISY CHAIN)

WHITE GROUND

180 181

TERMINATE AT EACH CONTROLLER

CB11

184

MHP

1 2

144

146

148

150 151

USED ON AGS130-210 UNITS ONLY

USED ON AGS210 UNITS ONLY

(TO TB1-1) 161

185

172

173

152

154 155

160

162

(SEE LINE 690)

LOAD SOLENOID

UNLOAD SOLENOID

120V

24V

GRN

186

175 176

ECONOMIZER

189

CB12

190

177

AGS190-210C

ONLY

HTR-OIL SEP.

HEATER

FIELD CONNECTED

REMOTE EVAPORATOR

TO: TB1-1

191 192

(SEE LINE 694)

LIQ

BIAS

BLOCK

880

881 882

883

MHPR

182

M*1

C1 C2

M*2

C2C1

M*3

C2C1

M*4

C2C1

M*5

C2C1

M*6

C2C1

SSS RUN

ANALOG OUTPUT J4-Y3

EXV

MOTOR

116 117TO: TB1-2

HEM.

117

179178

TO UNIT CONTROLLER BTO UNIT CONTROLLER A+ TO CIRCUIT CONTROLLER J4 TO CIRCUIT CONTROLLER J4

183

145

147

149

153

163

187

197

126

PID

BLACK WHITE

GREEN

RED

195 196

24V AC

PUMPDOWN

120V

TB1-40 139

PUMPDOWN

1 REV. 0D

DETAIL 1

EXV

DRIVER

LINE

NO.

-601

-602

-603

-604

-605

-606

-607

-608

-609

-610

-611

-612

-613

-614

-615

-616

-617

-618

-619

-620

-621

-622

-623

-624

-625

-626

-627

-628

-629

-630

-631

-632

-633

-634

-635

-636

-637

-638

-639

-640

-641

-642

-643

-644

-645

-646

-647

-648

-649

-650

-651

-652

-653

-654

-655

-656

-657

-658

-659

-660

-661

-662

-663

-664

-665

-666

-667

-668

-669

-670

-671

-672

-673

-674

-675

-676

-677

-678

-679

-680

-681

-682

-683

-684

-685

-686

-687

-688

-689

-690

-691

-692

-693

-694

-695

-696

-697

-698

-699

-700

-701

TERMINAL BLOCK

AND LEAD NUMBERS

TB*1

1 105, 114, 116, 160

180

1 2

183, 145

147, 149, 151, 153

155, 161, 187, 197

113, 101, 117, 179

181, MHP-1

MHP-2, 182, 184 122, 124, 127

142, BLK, 130, 2-OIL

WHT, 129

21 22

3-OIL, 135

3-SLIDE, 133

1-SLIDE, 137 2-SLIDE, 138

172, 1-LOAD

27 28

173, 1-UNLOAD

143 30 176, 177 93 174, 178

188, 18949

123, 125, 140

40 40

132, RED, 134

1-OIL, 136, 139

40 50

163, 2-LOAD, 2-UNLOAD, 19 91

165 PE

GRN - OIL, DPS PE

GRN, LOAD, UNLOAD

IMM AGSD3 43

Page 44

Remote Evaporator

This section contains data that is unique to AGS-DM/F remote evaporator models including:

• Refrigerant piping on page

• Dimensions on page

• Vibration isolators on page

• Physical data on page

Data common to both packaged and remote evaporator models are:

• Electrical data on page

• Evaporator pressure drop, on page

Piping Layout

Figure 25 shows the piping layout for one of the two refrigerant circuits for AGS units with a remote evaporator. Economizers may or may not be on any given circuit. Note that the refrigerant specialties are field installed adjacent to the evaporator. The outdoor unit, the evaporator, and a kit of refrigerant components are shipped as separate pieces. The outdoor unit is shipped with an operating charge of refrigerant. Refrigerant for the evaporator and field refrigerant piping is furnished by the contractor and must be added in the field.

The location and size of the refrigerant (and water) connections are shown on the dimension drawings beginning on page right.

NOTE: All field piping, wiring, and procedures must be performed in accordance with ASHRAE, EPA, and industry standards.

48.

53.

30.

44.

55.

22.

48. Looking at the control panel, circuit #1 is on the left, #2 on the

LIQUID

TUBING

LIQUID SHUT-OFF

ALV

Figure 25, Piping Schematic (Remote Evaporator)

SCHRADER

VALVE

(HEADER)

CONDENSOR

ASSEMBLY

SCHRADER

VALVE

STUB TUBE

DISCHARGE

TUBING

AIR

FLOW

OUTSIDE AIR

TEMPERATURE

SOLENOID

VALVE

SCHRADER

VALVE

THERMAL

EXPANSION

VALVE

SHUT-OFF BALL VALVE

DISCHARGE

FIELD

CONNECTION

POINT

FILTER

DRIER

TRANSDUCER (WH1, WH2)

SCHRADER

VALVE

SOLENOID

VALVE

FIELD INSTALLED LIQUID LINE COMPONENTS

SCHRADER

VALVE

(WAA)

ECONOMIZER FLASH GAS TO COMPRESSOR INTERSTAGE

SCHRADER

VALVE

CHARGING

VALVE

SCHRADER

VALVE

FILTER

DRIER

FLOW

AIR

FLOW

SCHRADER

VALVE

AIR

ECONOMIZER

DISCHARGE

TEMP. SENSOR

(WD1, WD2)

RELIEF

VALVE

SCHRADER

VALVE

SIGHT

GLASS

FLOW

EXPANSION

VALVE

FRAME 3200

COMPRESSOR

FIELD

CONNECTION

POINT

SUCTION

TUBING

(WOE TEMP.

SENSOR)

SUCTION

SHUT-OFF

VALVE

STUB TUBE

(WIE TEMP.

SENSOR)

DX EVAPORATOR

CHARGING

VALVE

SCHRADER

VALVE

RELIEF

VALVE

FIELD PIPING

SHOWN DASHED

WATER INWATER OUT

SCHRADER

VALVE

SUCTION

TRANSDUCER

(WL1, WL2)

SUCTION

TEMP. SENSOR

(ST1, ST2)

44 IMM AGSD3

Page 45

Field Wiring (Remote Evaporator)

Field wiring connections from the remote evaporator to the outdoor unit are shown on Figure 22 on

38. Additionally, sensor connections 2, 3, and 4 below, are required:

page

1. The electronic expansion valve has a 30-feet long cable attached and can be used, as is, when

the outdoor unit is less than 30 feet away. Beyond that, a junction box must be located within 30 feet of the evaporator, and up to 70 additional feet of 14GA wire connected from the cable to the unit, allowing up to a total distance of 100 feet (30 feet of cable and up to 70 feet of 14GA).

2. Two evaporator water temperature sensors with 100 feet of cable coiled in the unit control

panel for extension to the evaporator and insertion in fittings located on the side of the inlet and outlet nozzles.

3. One suction line refrigerant temperature sensor per circuit with 100 feet of cable coiled in the

unit control panel for extension to the evaporator. Place the sensor in a brazed well (provided in kit, installed in the field) on the suction line in a straight-flat area, close to the suction line pressure transducer. Install with heat conductive compound and insulate well. If installed on a horizontal pipe run, locate between the 2-4 o’clock position.

4. One suction line pressure transducer per circuit with 100 feet of cable coiled in the unit control

panel for extension to the evaporator. Mount the transducer in the suction line, 2-3 feet from the evaporator head, on the top or side of the pipe. Connection is ¼-inch flare with a flare Schrader.

Figure 26, Remote Evaporator Field Wiring

MCQUAY JUNCTION BOX

W2 W3

MCQUAY

JUNCTION BOX

(ON BASE RAIL)

DETAIL VIEW OF

FIELD JUNCTION BOX

DETAIL VIEW OF

RW RW

L2 L3

FIELD SUPPLIED

R2 R2 R3

R1 W1

R3 W3

SOLENOID

JUNCTION BOX

R2 W2

SOLENOID

LEGEND

3 CIRCUIT UNITS ONLY WIRE NUTS RED 14GA WIRE (MIN.)

WHITE 14GA WIRE (MIN.)

FIELD

SOLENOID

FIELD SUPPLIED

331687601 REV.00

Kit Components

The kit shipped with the unit has the following components for field installation: Filter-drier and cores Sight glass Charging Valve Electronic expansion valve Solenoid valve Evaporator vent and drain plugs Filter-drier cores for economizer piping

IMM AGSD3 45

Page 46

Refrigerant Line Sizing

Layout and size the refrigerant piping in accordance with the latest edition of the ASHRAE Handbook. A line sizing guide can be found below. Keep the refrigerant suction line pressure drop at close to a maximum of 2-degree F. drop in saturated temperature. Each of the two suction line’s velocity must be sufficient to carry oil when considering a capacity reduction of 25% in each circuit.

NOTE: A piping schematic diagram must be submitted to McQuay through the local sales office, and approved, before unit can be shipped. The diagram must show pipe size, elevations, length of runs and fittings.

NOTE: The following applies to all size units:

• Do not run refrigerant piping underground.

• Maximum linear line length can not exceed 75 feet.

• Maximum total equivalent length (TEL) can not exceed 180 feet.

• The evaporator can not be located more than 15 feet above the outdoor unit.

• The evaporator can not be located more than 20 feet below the outdoor unit.

• Suction line connection at unit = 3 5/8 inches

• Suction line connection at evaporator = 4 1/8 inches.

• Liquid line connection at the unit = 1 3/8.

• Liquid line connection at the evaporator = 1 5/8.

• A piping drawing showing altitudes, line lengths, slopes and all fittings, using Form SF 99006

(Revised 5/02), must be sent to the McQuay Technical Response Center for review prior to entering a unit order.

• When facing the unit control box, the left-hand compressor is circuit # 1, and the right-hand is

compressor # 2. With mix-matched compressor sizes, #1 is the smallest.

Table 32, Fitting Equivalent Feet of Pipe

Line Size

In. OD

2 5/8 29.00 69.0 1.0 6.0 4.1 3 1/8 35.0 84.0 1.0 7.5 5.0 3 5/8 41.0 100.0 1.0 9.0 5.9 4 1/8 47.0 120.0 1.0 10.0 6.7

Angle Valve Globe Valve Ball Valve

Table 33, Recommended Horizontal or Downflow Suction Line Size

AGS

Model

AGS140D

AGS160

170 to 210

Circuit

Both 3 5/8 3 5/8 3 5/8

#1 3 5/8 3 5/8 3 5/8 #2 3 5/8 3 5/8 3 5/8

Both 3 5/8 1.00 3 5/8 1.51 3 5/8 2.01 4 1/8 1.36 4 1/8 1.63

Up to 50

Equiv. Ft.

Size PD Size PD Size PD Size PD Size PD

NOTE: “Size” is tubing size in inches, “PD” is the pressure drop in equivalent degrees F. The line pressure drop can be interpolated by feet.

Up to 75

Equiv. Ft.

Table 34, Recommended Upflow Suction line Size

AGS

Model

AGS140D

AGS160

170 to 210

Circuit

Both

#1 #2

Both 3 5/8 1.00 3 5/8 1.51 3 5/8 2.01

Up to 50

Equiv. Ft.

Size PD Size PD Size PD

3 5/8 3 5/8 3 5/8 3 5/8 3 5/8 3 5/8 3 5/8 3 5/8 3 5/8

NOTE: “Size” is tubing size in inches, “PD” is the pressure drop in equivalent degrees F. The line pressure drop can be interpolated by feet.

Up to 75

Equiv. Ft.

Up to 100 Equiv. Ft.

90 Degree Std.

Radius Elbow

Up to 125 Equiv. Ft.

3 5/8 3 5/8 4 1/8

90 Degree Long

Radius Elbow

Up to 150 Equiv. Ft.

3 5/8 3 5/8 4 1/8

46 IMM AGSD3

Page 47

Table 35, Recommended Liquid line Size.

AGS

Model

AGS140D

AGS160

170 to 210

Circuit

Both

#1 #2

Both 1 3/8 1.30 1 3/8 1.95 1 3/8 2.6 1 3/8 3.25 1 3/8 3.90

Up to 50

Equiv. Ft.

Size PD Size PD Size PD Size PD Size PD

1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8

NOTE: “Size” is tubing size in inches, “PD” is the pressure drop in equivalent degrees F. The line pressure drop can be interpolated by feet.

Up to 75

Equiv. Ft.

Up to 100 Equiv. Ft.

Up to 125

Equiv. Ft.

Up to 150

Equiv. Ft.

IMM AGSD3 47

Page 48

Remote Evaporator Dimensions & Weights

Standard Efficiency

Figure 27, Dimensions, AGS 140DM – 170DM (Remote Evaporator)

M2 M4 M6

L2 L4

NOTES:

ISOLATOR MOUNTING HOLE LOCATIONS

1. ON BOTTOM SURFACE OF UNIT BASE

CENTER OF ISOLATOR MOUNTING HOLE LOCATED

2.0IN FROM OUTSIDE EDGE2.OF UNIT BASE.

100.1

.875

FIELD CONTROL

ONNECTIONS

95.0

38.8

COG

3.2

6.2

9.2

CONTROL

PANEL

60.3

64.3

68.3

88.0

COMP

CIRC #1

COMP

CIRC #2

.750

QTY.6

NOTE 1.

.875 POWER KNOCKOUTS

M1 M3

25.6

40.5

78.8

80.0

COG

AGS140-170DM - REMOTE EVAP 10 FAN

ALL DIMENSIONS ARE IN DECIMAL INCHES

SCALE

NONE

3.625 SUCTION

CONNECTIONS

1.375 LIQUID

CONNECTIONS

173.4

203.6

*331717802001*

4.2

229.2

32.5

17.1

88.0

86.0

66.3

49.4

38.6

21.7

2.0 0

NOTE 2.

Table 36, AGS140-170DM Shipping & Operating Weight, Center of Gravity Dimensions

Lifting Weights Mounting Weights COG Dimensions

AGS Model Type

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs lbs lbs lbs lbs lbs lbs (in.) (in.) (in.)

140-170DM Aluminum Fins 3235 1362 2156 1785 944 9770 9195 79.88 42.01 44 140-170DM Copper Fins 3591 1982 2371 2078 1411 11720 11145 87.76 45.87 44

Operating

Weight

Shipping

Weight

X Y Z

48 IMM AGSD3

Page 49

Figure 28, AGS 190DM & 210DM (Remote Evaporator)

M2 M4 M6

NOTES:

ISOLATOR MOUNTING HOLE LOCATIONS

1. ON BOTTOM SURFACE OF

CENTER OF ISOLATOR MOUNTING HOLE LOCATED

2.0IN FROM

.875 FIELD CONTROL KNOCKOUTS

OUTSIDE EDGE OF UNIT BASE.

100.1

95.0

38.8

COG

3.2

6.2

UNIT BASE.

CONTROL

PANEL

9.2

60.3

64.3

L2 L4

COMP

CIRC #1

COMP

CIRC #2

.750

QTY.6

NOTE 1.

.875

POWER

KNOCKOUTS

M1 M3 M5

L1 L3

25.6

40.5

78.8

COG

80.0

3.625 SUCTION

CONNECTIONS

1.375 LIQUID

CONNECTIONS

193.5

217.7

68.3

88.0

AGS190,210DM/AGS140-170DF - REMOTE EVAP - 12 FAN

ALL DIMENSIONS ARE IN DECIMAL INCHES

SCALE

NONE

*331717804001*

88.0 NOTE 2

86.0

66.3

49.4

38.6

21.7 NOTE 2

2.0

267.4

32.4

17.1

4.2

Table 37, AGS190-210DM Shipping & Operating Weight, Center of Gravity Dimensions

AGS Model Type

190-210DM Aluminum Fins

190-210DM Copper Fins

Lifting Weights Mounting Weights COG Dimensions L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs lbs lbs lbs lbs lbs lbs (in.) (in.) (in.)

3276 1694 2082 1861 1304 10495 9940 92.65 43.61 44 3641 2399 2280 2166 1878 12650 12080 101.28 47.24 44

Operating

Weight

Shipping

Weight

X Y Z

IMM AGSD3 49

Page 50

High Efficiency

Figure 29, Dimensions, AGS 140DF – 170DF (Remote Evaporator)

M2 M4 M6

L2 L4

COMP

NOTES:

ISOLATOR MOUNTING HOLE LOCATIONS

1. ON BOTTOM SURFACE OF

CENTER OF ISOLATOR MOUNTING HOLE LOCATED

2.0IN FROM

.875 FIELD CONTROL KNOCKOUTS

OUTSIDE EDGE OF UNIT BASE.

100.1

95.0

38.8

COG

3.2

6.2

UNIT BASE.

CONTROL

PANEL

9.2

60.3

64.3

68.3

88.0

CIRC #1

COMP

CIRC #2

.750

QTY.6

NOTE 1.

.875

POWER

KNOCKOUTS

M1 M3 M5

L1 L3

25.6

40.5

78.8

COG

80.0

AGS190,210DM/AGS140-170DF - REMOTE EVAP - 12 FAN

ALL DIMENSIONS ARE IN DECIMAL INCHES

SCALE

NONE

3.625 SUCTION

CONNECTIONS

1.375 LIQUID

CONNECTIONS

193.5

*331717804001*

88.0 NOTE 2

86.0

66.3

49.4

38.6

21.7 NOTE 2

2.0

217.7

267.4

32.4

17.1

4.2

Table 38, AGS140-170DF Shipping & Operating Weight, Center of Gravity Dimensions

AGS Model Type

140-170DF Aluminum Fins

140-170DF Copper Fins

Lifting Weights Mounting Weights COG Dimensions

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs lbs lbs lbs lbs lbs lbs (in.) (in.) (in.)

3276 1694 2082 1861 1304 10495 9940 92.65 43.61 44

3641 2399 2280 2166 1878 12650 12080 101.28 47.24 44

Operating

Weight

Shipping

Weight

X Y Z

50 IMM AGSD3

Page 51

Figure 30, Dimensions, AGS 190DF (Remote Evaporator)

M2 M4

COMP

NOTES:

ISOLATOR MOUNTING HOLE LOCATIONS

1. ON BOTTOM SURFACE CENTER OF ISOLATOR MOUNTING HOLE LOCATED

2.0IN FROM2.OUTSIDE EDGE OF UNIT BASE.

100.1

95.0

.875 FIELD CONTROL KNOCKOUTS

38.8

OF UNIT BASE.

CONTROL

PANEL

COG

CIRC #1

COMP

CIRC #2

.750

QTY.6

NOTE 1.

.875 POWER KNOCKOUTS

M1 M3

25.6

40.5

3.2

6.2

9.2

60.3

64.3

68.3

88.0

3.625 SUCTION

CONNECTIONS

1.375 LIQUID

CONNECTIONS

80.0

78.8

COG

150.6

193.5

217.7

AGS190DF - REMOTE EVAP - 12 FAN

ALL DIMENSIONS ARE IN DECIMAL INCHES

SCALENONE

*331717805001*

267.4

263.2

88.0

86.0

66.3

49.4

38.6

11.7

2.0 0

32.5

17.1

13.2 0

NOTE 2

Table 39, AGS190DF Shipping & Operating Weight, Center of Gravity Dimensions

Lifting Weights Mounting Weights COG Dimensions

AGS Model Type

L1, L2 L3, L4 M1, M2 M3, M4 M5, M6

lbs lbs lbs lbs lbs lbs lbs (in.) (in.) (in.)

190DF Aluminum Fins

190DF Copper Fins

3276 1694 2082 1861 1304 10495 9940 92.65 43.61 44

3641 2399 2280 2166 1878 12650 12080 101.28 47.24 44

Note: Models 140-160 are currently still in development; all data is preliminary and for informational purposes only.

Operating

Weight

Shipping

Weight

X Y Z

IMM AGSD3 51

Page 52

Remote Evaporators

Figure 31, Remote Evaporator Dimensions

NOTES:

1. Liquid line connection is 1 5/8-inch IDS flange.

2. All dimensions are in inches (mm).

3. Insulated with ¾-inch Armaflex or equal UL approved insulation.

4. Tube side (refrigerant) maximum working pressure: 350 psig @ 175°F.

5. Shell side (water) maximum working pressure: 152 psig.

COND.

AGS MODEL

140DM to 170DM

140DF to 170DF

190DM to 210DM

190DF

MODEL

NUMBER

330904451

330904452

'A' 'B' 'C' 'D' 'E' 'F' 'G'

20.3

11.0

(280)

11.0

(280)

16.0

(406)

16.0

(406)

(515)

20.3

(515)

13.2

(334)

13.2

(334)

DIMENSIONAL DATA, inches (mm)

'H'

I.D.S.

90.2

17.8

(2292)

90.2

(2292)

(452)

17.8

(452)

121.2

(3078)

121.2

(3078)

4 1/8 (105)

'J' 'K' 'L' 'M'

9.2

103.9

114.9

(234)

9.2

(234)

(2640)

103.9

(2640)

(2918)

114.9

(2918)

108.3

(2750)

108.3

(2750)

'N'

DIA.

18.5

(470)

18.5

(470)

52 IMM AGSD3

Page 53

Physical Data, Standard Efficiency

Table 40, Standard Efficiency, AGS 140DM – AGS 210DM (Remote Evaporator)

DATA

BASIC DATA

Unit Cap. @ ARI tons (kW) 137.0 (481.4) 155.2 (545.4) (163.7 (575.7) Unit Operating Charge lbs (kg) 167 (76) 167 (76) 167 (76) 167 (76) 167 (76) 167 (76) Cabinet Dimensions 229.2x88x100.1 229.2x88x100.1 229.2x88x100.1 Unit Operating Weight, lbs. (kg) 9770 9770 9770 Unit Shipping Weight, lbs (kg) 9195 9195 9195

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal Capacity, tons (kW) 70 (246) 70 (246) 70 (246) 85 (299) 85 (299) 85 (299) Minimum Capacity (% of Full Load) 15 15 15

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

No. of Fans/Circuit – 30 in. Fan Dia. 5 5 6 6 6 6 Fan Motor hp (kW) 2.0 (1.5) 2.0 (1.5) 2.0 (1.5) Fan & Motor RPM, 60Hz 1140 1140 1140 60 Hz Fan Tip Speed, fpm (m/s) 8950 (45.5) 8950 (45.5) 8950 (45.5) 60 Hz Total Unit Airflow, cfm (l/s) 108630 (51280) 108630 (51280) 108630 (51280)

REMOTE EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE

Shell Dia.-Tube Length, in.(mm) 16x108 (406x2750) 16x108 (406x2750) 16x108 (406x2750) Water Volume, gallons (liters) 63.6 (241) 63.6 (241) 63.6 (241) Refrigerant Charge, lbs (kg) 2.6 (1.2) 2.6 (1.2) 2.6 (1.2) 2.6 (1.2) 2.6 (1.2) 2.6 (1.2) Operating Weight lbs (kg) 1675 (759) 1675 (759) 1675 (759) Shipping weight, lbs (kg) 1330 (605) 1330 (605) 1330 (605) Max. Water Pressure, psi (kPa) 152 (1048) 152 (1048) 152 (1048) Max. Refrigerant Press., psi (kPa) 350 (2413) 350 (2413) 350 (2413)

140DM 160DM 170DM

Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

DATA

BASIC DATA

Unit Cap. @ ARI tons (kW) 176.5 (575.8) 188.9 (664.4) Unit Operating Charge lbs (kg) 187 (85) 197 (90) 197 (90) 197 (90)) 197 (90) 197 (90) Cabinet Dimensions 267.4x88x100.1 267.4x88x100.1 267.4x88x100.1 Unit Operating Weight, lbs. (kg) 10495 10495 10495 Unit Shipping Weight, lbs (kg) 9940 9940 9940

COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal Capacity, tons (kW) 85 (299) 100 (352) 100 (352) 100 (352) Minimum Capacity (% of Full Load) 15 15 15

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

No. of Fans/Circuit – 30 in. Fan Dia. 6 6 6 6 6 6 Fan Motor hp (kW) 2.0 (1.5) 2.0 (1.5) 2.5 (1.9) Fan & Motor RPM, 60Hz 1140 1140 1140 60 Hz Fan Tip Speed, fpm (m/s) 8950 (45.5) 8950 (45.5) 8950 (45.5) 60 Hz Total Unit Airflow, cfm (l/s) 130360 (61530) 130360 (61530) 137328 (64819)

REMOTE EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE

190DM 200DM 210DM

Ckt 1 Ckt 2 Ckt 1 Ckt 2

Ckt 1 Ckt 2

201.1 (707.4)

105 (370) 105 (370)

IMM AGSD3 53

Page 54

High Efficiency

Table 41, High Efficiency, AGS 1470DF – AGS 190DF (Remote Evaporator)

DATA

BASIC DATA

Unit Cap. @ ARI tons (kW) 145.6 (512) 166.9 (587) 180.6 (635.2) Unit Operating Charge lbs (kg) 177 (81) 177 (81) 177 (81) 177 (81) 207 (94) 207 (94) Cabinet Dimensions

L x W x H, in. (mm) Unit Operating Weight, lbs. (kg) 10495 10495 10495 Unit Shipping Weight, lbs (kg) 9940 9940 9940

Nominal Capacity, tons (kW) 70 (246) 85 (299) 70 (246) 85 (299) 85 (299) 85 (299) Minimum Capacity (% of Full Load) 15 15 15

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER

Pumpdown Capacity, lbs (kg) 438 (199) 438 (199) 438 (199) 438 (199) 438 (199) 438 (199) Coil Inlet Face Area, sq. ft. (sq m.) 158.3 (14.7) 158.3 (14.7) 158.3 (14.7) 158.3 (14.7) 158.3 (14.7)

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

No. of Fans/Circuit – 30 in. Fan Dia.

Fan Motor hp (kW) 2.0 (1.5) 2.0 (1.5) 2.0 (1.5) Fan & Motor RPM, 60Hz 1140 1140 1140 60 Hz Fan Tip Speed, fpm (m/s) 8950 (45.5) 8950 (45.5) 8950 (45.5) 60 Hz Total Unit Airflow, cfm (l/s) 130360 (61530) 130360 (61530) 130360 (61530)

REMOTE EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE

Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

140DF 170DF 190DF

267.4x88x100.1

(6792x2235x2542)

COMPRESSORS, SCREW, SEMI-HERMETIC

6 6 6 6 6 6

267.4x88x100.1

(6792x2235x2542)

267.4x88x100.1

(6792x2235x2542)

158.3 (14.7)

54 IMM AGSD3

Page 55

Vibration Isolators

For Remote Evaporator Units. The vibration isolator specific locations and the kit numbers shown on the following two pages are based on the weights shown on the previous page.

Rubber-in-Shear

Table 42, Standard Efficiency with Aluminum Fin Condensers

Unit Size

140DM to

170DM

190DM to

210DM

1 2 3 4 5 6

RP-4

Green

RP-4

Green

RP-4

Green

RP-4

Green

Table 43, High Efficiency with Aluminum Fin Condensers

Unit Size

140DF to

170DF

1 2 3 4 5 6

RP-4

Green

RP-4

Green

R-I-S Mounting Locations

RP-4

Red

RP-4

Red

R-I-S Mounting Locations

RP-4

Red

RP-4

Red

RP-4

Red

RP-4

Red

RP-4

Black

RP-4

Red

RP-4

Black

RP-4 Black

RP-4

Red

RP-4 Black

R-I-S Kit

Number

330904134

330904124

R-I-S Kit

Number

330904134

190DF

RP-4

Green

RP-4

Green

RP-4

Red

RP-4

Red

RP-4

Red

Table 44, Standard Efficiency with Copper Fin Condensers

Unit Size

140DM to

210DM

1 2 3 4 5 6

RP-4

Green

RP-4

Green

R-I-S Mountings

RP-4

Green

RP-4

Green

RP-4

Red

Table 45, High Efficiency with Copper Fin Condensers

Unit Size

140DF to

190DF

1 2 3 4 5 6

RP-4

Green

RP-4

Green

R-I-S Mountings

RP-4

Green

RP-4

Green

RP-4

Red

RP-4

Red

RP-4

Red

RP-4

Red

330904124

R-I-S Kit

Number

330904133

R-I-S Kit Number

330904133

IMM AGSD3 55

Page 56

Spring-Flex

Table 46, Standard Efficiency with Aluminum Fin Condensers

Unit Size

140DM

170DM 190DM

210DM

CP-2 CP-2 CP-2 CP-2 CP-2 CP-2

White White Gray Gray Orange Orange

CP-2 CP-2 CP-2 CP-2 CP-2 CP-2

White White Gray Gray Green Green

Spring-Flex Mountings

3 4 5 6

Table 47, High Efficiency with Aluminum Fin Condensers

Unit Size

140DF to

190DF

1 2 3 4 5

CP-2 CP-2 CP-2 CP-2 CP-2

White White Gray Gray Green

Spring-Flex Mountings

CP-2

Green

Table 48, Standard Efficiency with Copper Fin Condensers

Unit Size

140 DM

170DM 190DM

210DM

1 2 3 4 5

CP-4 CP-4 CP-2 CP-2 CP-2

Orange Orange White White Green

CP-4 CP-4 CP-4 CP-4 CP-2

Orange Orange Orange Orange White

Spring-Flex Mountings

CP-2

Green

CP-2

White

Spring=Flex

Number

330904128

330904129

Spring=Flex

Number

330904129

Spring=Flex Kit

Number

330904130

330904132

Kit

Table 49, High Efficiency with Copper Fin Condensers

Unit Size

140DF to

190DF

1 2 3 4 5

CP-4 CP-4 CP-4 CP-4 CP-2

Orange Orange Orange Orange White

Spring-Flex Mountings

CP-2

White

Spring=Flex

Kit

Number

330904132

56 IMM AGSD3

Page 57

Solid State Starters

Solid state starters are standard on all AGS units. A solid state starter uses a silicon-controlled rectifier (SCR) power section to allow a motor to be brought to full speed with a reduced initial voltage that increases to full line voltage over a given time. The McQuay motor starter, custom designed for this specific application, is microprocessor controlled. Along with this starting technique, the motor starter also provides protection for the motor and monitors its load conditions.

The starter offers:

• Solid state design.

• Closed-loop motor current control.

• Programmable motor protection.

• Programmable operating parameters.

• Programmable metering options.

The three-phase starter contains a six-SCR power section with two SCRs per phase connected in inverse parallel. This power section is capable of providing maximum torque per amp throughout the motor’s speed-torque curve with minimal motor and starter heating. At the same time, the starter continually monitors the amount of current being delivered to the motor, thus helping to protect the motor from overheating or drawing excessive current. The starter will automatically stop the motor if the line-to-line current is not within acceptable ranges, or if the current is lost in a line. The motor current scaling is set according to the motor size and the specific application. The starter circuitry is contained on a single printed circuit board, which contains all the logic and SCR gate drive circuitry.

Operating messages are displayed on a three-character LED display located in the unit control panel. The LED display on the control card displays:

• Operating messages that indicate the status of the motor and/or starter.

• Operating parameters that are programmed into the starter.

• Fault codes that indicate a problem with the motor application or starter.

Operating Messages

Possible operating messages are as follows:

Message Meaning noL Line voltage is not present.

rdy Line voltage is present and starter is ready.

acc Motor is accelerating after a start command has been received.

uts The motor has achieved full speed.

run Motor is operating at full speed, and ramp time has expired.

dCL A Stop command was received and the motor is decelerating with the set

deceleration profile.

OL OL will alternately blink with the normal display on the LED display when motor

thermal overload content has reached 90% to 99% of its capacity.

IMM AGSD3 57

Page 58

OLL The motor thermal overload content has reached 100%, and the motor has

stopped. The motor cannot be restarted until the overloaded motor has cooled and OLt is displayed.

OLt The motor thermal overload content has been reduced to 60% or less, and the

motor can be restarted.

ena Passcode protection is enabled.

dis Passcode is disabled.

oxx xx = overload thermal content in percentage. Press the Down button to toggle to

this display.

cxx xx = pending fault.

no Attempted to change a passcode protected parameter without proper security.

… Three decimal places blink when remote display is active.

Fxx xx Fault Code

Table 50, Fault Codes

Number Description

00 No Fault -- -01 UTS Time Limit Expired Y Y 02 Motor Thermal Overload Trip Y N 10 Phase Rotation Error, Not A-B-C N Y 12 Low Line Frequency N Y 13 High Line Frequency N Y 15 Input Power Not Three phase N Y 21 Low Line L1-L2 Voltage Y Y 22 Low Line L2-L3 Voltage Y Y 23 Low Line L3-L1 Voltage Y Y 24 High Line L1-L2 Voltage Y Y 25 High Line L2-L3 Voltage Y Y 26 High Line L3-L1 Voltage Y Y 27 Phase loss N Y 28 No Line Voltage N Y 30 I.O.C. (Instantaneous Overcurrent) N N 31 Overcurrent Y N 37 Current Imbalance Y Y 38 Ground Fault Y N 39 No Current At Run N Y 40 Shorted/Open SCR N N 47 Stack Protection Fault N Y 48 Bypass Contactor Fault (on STOP input) Y N 50 Control Power Low N Y

Controlled

Stop

Continued next page

Number Description

Controlled

Stop

Auto

Reset

Auto

Reset

58 IMM AGSD3

Page 59

51 Current Sensor Offset Error -- N 52 Burden Switch Error N N 60 Thermistor Trip N N 61 Stack OT Switch Trip N N 71 Analog Input Trip Y Y 82 Modbus Time-out Y Y 94 CPU Error – Software Fault N N 95 CPU Error – Parameter Storage Fault N N 96 CPU Error – Illegal Instruction Trap N N 97 CPU Error – Software Watchdog Fault N N 98 CPU Error – Spurious Interrupt N N N 99 CPU Error – Program Storage Fault N N

Starter Planned Maintenance

During commissioning:

• Torque all power connections during commissioning. This includes factory-wired components.

• Check all of the control wiring in the package for loose connections.

During the first month after the starter has been put in operation:

• Re-torque all power connections every two weeks. This includes factory-wired components.

• Inspect cooling fans (if applicable) after two weeks for proper operation.

After the first month of operation:

• Re-torque all power connections every year.

• Clean any accumulated dust from the starter using a clean source of compressed air.

• Inspect the cooling fans every three months for proper operation.

• Clean or replace any air vent filters on the starter every three months.

NOTE: If mechanical vibrations are present at the installation site, inspect the connections more frequently.

IMM AGSD3 59

Page 60

Figure 32, Trouble Shooting Guide

NoNoN

NoN

Start

Replace

Fuses

Replace

Circuit

Breaker

Correct

Inline Fault

Fuses OK?

Circuit

Breaker OK?

Yes

In-LineOK?

Yes

Correct Power

Source

Problem

Yes

Low or Missing

Phase Order

ThermalTrip?

Yes

Wiring OK?

Control Card

Line?

Yes

Fault

oYes

Yes

Interlock

Open?

Yes Yes

Replace

Swap Any

2Power

Leads

High

Ambient?

Correct and

Wait to Cool

Yes

Circulation?

Bad Air

Correct

Interlock

State

Correct Wiring

DoesProblem

Still Exist

Yes

Go to Page 39

Correct Wiring

Return To

Service

Return To

Service

Wiring OK?

Yes

Correct and

Wait to Cool

Overloaded?

Lower Motor

Motor

Yes

Load

60 IMM AGSD3

Page 61

From Previous Page

Current

Imbalance Fault?

Yes

Correct Wiring

Replace

Defective

SCRs

Wiring Good?

Yes Yes

Motor

Winding Short?

SCRs OK?

Yes Yes

All Gate

Pulses Present?

No Yes

Replace

Control Card

Yes

Fuses Blown or

Breaker Tripped?

Replace Fuse

or Reset Breaker

Motor Pro

Repair or

Replace Motor

Contact

Benshaw

For Assistance

lem?

CT Burden

Switches Set

Correctly?

lace

Control Card

Check Jum

Parameters

ers

and CTs

Return to

Normal

Operation

Does Pro

Still Exist?

Yes

Contact

McQuay

For Assistance

lem

IMM AGSD3 61

Page 62

FLOW CHART DETAILS:

1. Fuses Determine if power line fuses have been installed, and if they are

operating properly.

2. Circuit Breaker Determine if the circuit breaker is off, or has tripped and

disconnected the line from the starter.

3. Power Line Voltage Verify that line voltage is present, and that it is the correct

voltage.

4. Phase Order Fault If Fault Codes F1 or F2 are displayed on the control card LED

display, exchange any two incoming power line cable connections.

5. Heat Sink Switch Investigate whether heat sink thermal switch is open.

6. Safety Device Determine if an equipment protection device attached to the

starter is disabling the start command.

7. Wiring Connections Verify that the wiring connections are correct and that the

terminations are tightened.

8. Air Temperature Investigate whether the air temperature surrounding the heat sink

is hot.

9. Air Circulation Determine if the airflow around the heat sink fins is being

restricted, or if a fan has failed.

10. Motor Overload Determine if the motor’s load is too large for the motor size.

11. Current Imbalance Fault If Fault Codes F23 or F24 are displayed on the control card LED

display, diagnose and correct the cause of the current imbalance parameter P16.

12. Motor Winding Problem Conducting a megger test of the motor can identify an internal

motor winding problem. NOTE: To avoid damaging the starter isolate the motor before conducting the megger test.

WARNING

Hazardous voltages exist at the starter terminals. Lock out and tag all power sources before making resistance measurements to avoid personal injury or death.

13. SCRs This step can help determine if a problem exists with the SCRs.

Using a multi-meter or similar device, measure the resistance between:

• L1 terminal and T1 terminal

L2 terminal and T2 terminal

•

L3 terminal and T3 terminal

•

The resistance should be more than 50k ohms. Measure the gate resistance between the white and red of each twisted pair (6

14. Gate Pulses

total). The gate resistance should be between 8 and 50 ohms

This step can help to determine if the control card is functioning

properly. Check for gate firing voltage between 0.3 and 1.5 volts when the card is operating.

15. Motor Current

Determine if motor current signal scaling is correct.

62 IMM AGSD3

Page 63

Solid State Starter Settings

Operating Parameters Settings for Default Value and Settable Range:

Table 51, Starter Settings

No. Operating Parameter Default Range of Setting

P1 P2 P3 P4 P5 P6 P7 P8

P9 P10 P11 P12 P13 P14 P15

P16

P17 P18 P19 P20 P21 P22

P23 P24

P25 P26 P27 P28 P29 P30 P31 P32

Motor Full Load Amps (FLA) 1A 1 to 9999A

Motor Rated Load Amps (RLA) 1A 1 to 9999A

Motor Service Factor 1.25 1-1.99

Motor Overload Class 10 1-40,Off Initial Motor Starting Current 225% 50 - 400% Max. Motor Starting Current 300% 100 – 800%

Motor Ramp Time 7 sec 0 - 300 sec

UTS time 10 sec 1 - 900 sec

Stop Mode Cos Coast/Voltage decel Deceleration Level 1 40% 0 – 100% Deceleration Level 2 20% 0 – 50%

Deceleration Time 2 sec 1 – 180 sec

Default Meter Display 0(Status) 0-19 Overcurrent Trip Level 140% Off, 50 to 800%RLA Overcurrent Trip Time 2 sec Off, .1 – 90 sec

Rated RMS Voltage 460

Overvoltage Trip Level 10% Off, 1 – 40% rated volts

Undervoltage Trip Level 10% Off, 1 – 40% rated volts

Over/Under Voltage Delay Time 1 Sec .1-90 Sec

Current Imbalance Trip Level 40% 5 - 40%

Controlled Fault Stop Off Off, On

Auto Fault Reset Delay Time 60 Off, 1 – 120 sec

CT Ratio 2640

Control Source Ter Terminal/Network

Modbus Address 2 1 - 247

Modbus Baud Rate 19.2 Kbps 1.2,2.4,4.8,9.6,19.2 kbps

Modbus Timeout 1 sec Off, 1 – 120 sec

Analog Output Function 1 1 - 11

Analog Output Span 100% 1 – 125%

Analog Output Offset 0% 0 – 99%

Passcode 0-9999 Fault Log Display faults

100,110,120,200,208,220,230,24

0,350,380,400,415,440,460,480,

500,525,575,600,660,690,1000

72,96,144,288,864,2640,2880,57

60,8000,14400,28800

IMM AGSD3 63

Page 64

Component Location

Major Component Location

Figure 33, Unit Cutaway View

Power Panel

Suction Connection for Remote Evaporators (2)

Control Panel

Chilled Water Inlet

Two-circuit DX Evaporator

Filter-drier (2)

Chilled Water

Electronic

Expansion

Valve (2)

Liquid Connection for Remote

64 IMM AGSD3

Page 65

Figure 34, Piping Schematic, One of Two Circuits

SCHRADER

VALVE

(HEADER)

CONDENSOR

ASSEMBLY

ECONOMIZER

SCHRADER

DISCHARGE

TUBING

AIR

FLOW

VALVE

OUTSIDE AIR

TEMPERATURE

(WAA)

ECONOMIZER FLASH GAS TO COMPRESSOR INTERSTAGE

SCHRADER

VALVE

SOLENOID

VALVE

THERMAL

EXPANSION

VALVE

SOLENOID

VALVE

LIQUID TUBING

LIQUID SHUT-OFF VALVE

CHARGING

VALVE

SCHRADER

VALVE

SCHRADER

VALVE

AIR

FLOW

FILTER DRIE

AIR

FLOW

SCHRADER

VALVE

DISCHARG

TRANSDUCER

(WH1, WH2)

DISCHARGE

TEMP. SENSOR

(WD1, WD2)

RELIEF

VALVE

SCHRADER

SIGHT

GLASS

VALVE

FLOW

EXPANSION

VALVE

FRAME 3200

COMPRESSOR

(WOE TEMP .

SENSOR)

SUCTION

SHUT-OFF (OPTIONAL)

SUCTION

TUBING

RELIEF

VALVE

(WIE TEMP.

SENSOR)

DX EVAPORATOR

VALVE

TRANSDUCER

(WL1, WL2)

TEMP. SENSOR

CHARGING

VALVE

WATER INWATER OUT

SUCTION

(ST1, ST2)

The above diagram illustrates one of the two circuits of an AGS chiller. The evaporator has two single-pass circuits with water passing over baffles on the shell side.

The vertical and slanted coils on one side of the unit comprise a condensing circuit. Models may have none, one, or two external economizer circuits consisting of a brazed-plate heat exchanger and expansion valve (not shown on the above diagram).

Figure 35, Compressor-mounted Components

Mechanical High

Pressure Cutout Switch

Compressor Relief Valve

Oil Heater

Optical Oil Level Sensor

IMM AGSD3 65

Page 66

Power Panel

The power panel is located on the front of the unit, to the right of the control panel.

Figure 36, Power Panel Components (Optional Single Point Power)

Contol

Transformer

and fuses

Breaker,

Circuit #1

Breaker,

Circuit #3

Unit

Disconnect

Switch

Breaker, Circuit #2

Starter,

Circuit #1

Starter,

Circuit #3

Line

Terminals

Starter, Circuit #2

NOTE: A three-compressor unit with standard solid state starters is illustrated. Breaker and starter #3 are absent on AGSD3 two-compressor models.

66 IMM AGSD3

Page 67

Control Panel

The control panel is located on the front of the unit, to the left of the power panel.

Figure 37, Control Panel Components

MicroTech II Controller, CP1

Expansion I/O Controllers

Switch and Fuse Panel

NOTE: A two-compressor unit is illustrated.

Location for Optional 115V Outlet

Expansion Valve Drivers, One Per Circuit

IMM AGSD3 67

Page 68

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 sight glasses, and the compressor oil level sight glass. In addition, check the MicroTech II controller temperature and pressure readings with gauges and thermometers to see that the unit has normal condensing and suction pressure and 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 log be copied and a report be completed on a regular basis. The log will serve as a useful tool for a service technician in the event service is required.

Initial start-up date, vibration readings, compressor megger readings and oil analysis information should be kept for reference base-line data.

Compressor Maintenance

Since the compressor is semi-hermetic, no yearly compressor maintenance is normally required; however, vibration is an excellent check for proper mechanical operation. Compressor vibration contributes to a decrease in unit performance and efficiency and indicates that maintenance is required. It is recommended that the compressor be checked with a vibration analyzer at, or shortly after, start-up and again on an annual basis. The load should be maintained as closely as possible to the load of the original test and only one compressor should be running at a time. The initial vibration analyzer test provides a benchmark of the compressor and, when performed routinely, can give a warning of impending problems.

Lubrication

No routine lubrication is required on AGS 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.

Figure 38, Compressor Oil Filter

Compressor oil must be ICI RL68HB, McQuay Part Number 735030446 in a 1-gallon container. This is 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.

The oil filter resides in the compressor housing as

Oil Sight Glass

The top of the oil level should be visible in the sight glass. If the glass is completely filled with oil at all times, the circuit is overcharged with oil. If only refrigerant is visible in the glass, the circuit has insufficient oil.

A mechanical oil pressure differential switch is mounted on the unit frame adjacent to each compressor and will shut down the compressor at a differential pressure greater than 25 psi. The switch has automatic reset but is locked out by the MicroTech II control, which must be reset through the software. A gauge can be put across the switch to actually measure the pressure drop. The normal pressure drop is 5 to 6 psi. Change the filter at 15 psi.

Oil Filter

Housing

shutoff valve require pumping down the circuit in order to change the filter.

shown in

Figure 38. Units without a suction service

68 IMM AGSD3

Page 69

Electrical Terminals

DANGER

Electric equipment can cause electric shock with a risk of severe personal injury or death. Turn off, lock out and tag all power before continuing with following service. Panels can have more than one power source..

CAUTION

Periodically check electrical terminals for tightness and tighten as required. Always use a back-up wrench when tightening electrical terminals..

Condensers

The condensers are air-cooled and constructed of 3/8" (9.5mm) OD 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 non-caustic, non-acidic, foaming coil cleaners available at most air conditioning supply outlets. Flush the coil from the inside out.

WARNING

Use caution when applying coil cleaners. They can contain potentially harmful chemicals. Wear breathing apparatus and protective clothing. Thoroughly rinse all surfaces to remove any cleaner residue. Do not damage the fins during cleaning.

If the service technician has reason to believe that the refrigerant circuit contains noncondensables, recovery of the noncondensables will be required, strictly following Clean Air Act regulations governing refrigerant discharge to the atmosphere. The service Schrader valves are located on both vertical coil headers 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. Recover the noncondensables 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 the unit off and repeat the procedure. Follow accepted environmentally sound practices when removing refrigerant from the unit.

Liquid Line Sight Glass

Observe the refrigerant sight glasses (one per circuit) weekly. A clear glass of liquid indicates that there is adequate refrigerant charge in the system to provide proper feed through the expansion valve. Bubbling refrigerant in the liquid line sight glass, during stable run conditions, may indicate that there can be an electronic expansion valve (EXV) problem since the EXV regulates liquid subcooling. Refrigerant gas flashing in the sight glass 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 page

22 for maximum allowable pressure drops).

An element inside the sight glass indicates the moisture condition corresponding to a given element color. If the sight glass does not indicate a dry condition after about 12 hours of operation, the circuit should be pumped down and the filter-drier changed. An oil acid test is also recommended.

Do not use the sight glass on the EXV body for refrigerant charging. Its purpose is to view the position of the valve.

Lead-Lag

A feature on all McQuay AGS 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 II 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

IMM AGSD3 69

Page 70

hours will cycle off first. The operator can override the MicroTech II controller, and manually select the lead circuit as circuit #1 or #2.

Preventative Maintenance Schedule

PREVENTATIVE MAINTENANCE SCHEDULE

OPERATION WEEKLY

General Complete unit log and review (Note 3) X Visually inspect unit for loose or damaged components and

visible leaks Inspect thermal insulation for integrity X Clean and paint as required X

Electrical Sequence test controls X Check contactors for pitting, replace as required X Check terminals for tightness, tighten as necessary X Clean control panel interior X Clean control box fan filter (Note 7) X Visually inspect components for signs of overheating X Verify compressor and oil heater operation X Megger compressor motor X

Refrigeration/Oil Leak test X Check liquid line sight glasses for clear flow X Check compressor oil sight glass for correct level (oil charge) X Check filter-drier pressure drop (see manual for spec) X Check oil filter pressure drop (Note 6) X Perform compressor vibration test X Perform oil analysis test on compressor oil X

Condenser (air-cooled) Clean condenser coils (Note 4) X Check fan blades for tightness on shaft (Note 5) X Check fans for loose rivets and cracks, check motor brackets X Check coil fins for damage and straighten as necessary X

MONTHLY

(Note 1)

Notes:

1. Monthly operations include all weekly operations.

2. Annual (or spring start-up) operations include all weekly and monthly operations.

3. Log readings can be taken daily for a higher level of unit observation.

4. Coil cleaning can be required more frequently in areas with a high level of airborne particles.

5. Be sure fan motors are electrically locked out.

6. Replace the filter if pressure drop exceeds 20 psi.

7. The weekly fan filter cleaning schedule can be modified to meet job conditions.

ANNUAL

(Note 2)

70 IMM AGSD3

Page 71

W arranty Statement

Limited Warranty

McQuay’s written Limited Product Warranty, along with any extended warranty expressly purchased is the only warranty. Consult your local McQuay Representative for warranty details. Refer to Form 430285Y. To find your local McQuay Representative, go to www .mcquay.com.

Service

CAUTION

1. Service on this equipment must be performed by trained, experienced refrigeration

personnel familiar with equipment operation, maintenance, correct servicing procedures, and the safety hazards inherent in this work. Causes for repeated tripping of equipment protection controls must be investigated and corrected.

2. Anyone servicing this equipment must comply with EPA requirements regarding

refrigerant reclamation and venting.

DANGER

Disconnect all power before doing any service inside the unit to avoid bodily injury or death.

MULTIPLE POWER SOURCES CAN FEED THE UNIT.

Liquid Line Filter-Driers

Replace the filter-drier cores any time excessive pressure drop is read across the filter-drier and/or when bubbles occur in the sight glass with normal subcooling. There is one, two-core drier in each circuit. Models AGS 180 to 210 have economizers that incorporate an additional filter-drier that should also be checked. The maximum recommended pressure drop across the filter-drier is 7 psi at full load.

The filter-driers should also be changed if the moisture indicating liquid line sight glass indicates excess moisture in the system, or an oil test indicates the presence of acid.

High acid cores may be used temporarily, but replaced after two day use.

The following is the procedure for changing the filter-drier core:

The standard unit pumpdown is set to stop pumpdown when 20 psig (138 kPa) suction pressure is reached. To fully pump down a circuit beyond 20 psig (138 kPa) for service purposes, a "Full Pumpdown" service mode can be activated using the keypad.

With Full Pumpdown = Yes, then the next time the circuit is pumped down, the pumpdown will continue until the evaporator pressure reaches 15 psig (103 kPa) or 120 seconds have elapsed, whichever occurs first. Upon completing the pumpdown, the "FullPumpDwn" setpoint is automatically changed back to "No".

The procedure to perform a full service pumpdown for changing the filter-drier core is as follows:

1. Under the "Alarm Spts", change the "FullPumpDwn" setpoint from "No" to "Yes".

2. Move the circuit switch to the OFF position. The compressor will unload to minimum slide

position and the unit will pump down.

IMM AGSD3 71

Page 72

3. Upon completing the full pumpdown per step 3, the "FullPumpDwn" setpoint is automatically

changed back to "No" which reverts back to standard 20 psig (138 kPa) pumpdown stop pressure.

4. If the pumpdown does not go to 15 psig (103 kPa) on the first attempt, one more attempt can

be made by repeating the above steps. Do not repeat "FullPumpDwn" more than once to avoid excessive screw temperature rise under this abnormal condition.

5. The circuit is now in the deepest pumpdown that can be achieved by the use of the compressor.

Close the two liquid line shutoff valves upstream of the filter-drier, on the circuit to be serviced plus the optional suction shutoff valve. Manually open the EXV, then remove the remaining refrigerant from the evaporator by the use of a refrigerant recovery unit.

6. Loosen the cover bolts, remove the cap and replace the filters.

7. Evacuate and open valves. Evacuate the lines through the liquid line manual shutoff valve(s) to remove noncondensables that

could have entered during filter replacement. Perform a leak check before returning the unit to operation.

Compressor Slide Valves

The slide valves used for unloading the compressor are hydraulically actuated by pulses from the load/unload solenoid as controlled by the circuit controller. See OM AGS for details on the operation.

Electronic Expansion Valve (EXV)

The electronic expansion valve is located in each circuit’s liquid line entering the evaporator. The expansion valve meters the amount of refrigerant entering the evaporator to match the cooling

load. It does this by maintaining constant suction superheat. (Superheat is the difference between the actual refrigerant temperature of the gas as it leaves the evaporator and the saturation temperature corresponding to the evaporating pressure.) The EXV logic controls the superheat between 4°F at 0% slide position and 8°F at 100% slide position.

The position of the valve can be viewed at any time by using the MicroTech II controller keypad through the View Refrigerant menus. There are 6386 steps between closed and full open. There is also a sight glass on the EXV to observe valve movement and to check if it is open or closed visually.

Evaporator

The evaporator is a two-circuit, direct expansion, shell-and-tube type with water flowing through the shell and refrigerant flowing in one pass through the tubes. The tubes are internally enhanced to provide extended heat transfer surface. Normally, no service work is required on the evaporator other than cleaning the water side in the event of improper water treatment or contamination.

Charging Refrigerant

Note:

It is a good idea to record the normal values of refrigerant pressures, subcooling, superheat, and evaporator and condenser approach temperatures during startup by the McQuay service technician. This makes it easier to spot errant unit behavior.

72 IMM AGSD3

Page 73

Indications of a low refrigerant R-134a charge:

• Condenser subcoolong approaching 0 degrees F.

• Suction superheat higher than 10 to 12 degrees F.

• Bubbles in the sight glass.

Indications of a high refrigerant R-134a charge:

• Condenser pressure is abnormally high.

• Subcooling is abnormally high. Take note of the subcooling on the unit at startup and use this

value as a benchmark.

• EXV is at minimum position and discharge superheat is low (below 22 degrees F). The circuit

controller View Refrigerant Screen #7 displays the valve position and the valve range. The minimum position occurs when the valve position value remains at the lower limit of the range displayed.

AGS air-cooled screw compressor chillers are shipped factory-charged with a full operating charge of refrigerant; but there can be times when 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 beginning on page initial charge of 80% to 90% of the nameplate is assumed. Unit charge adjustment should be done at 100% load, at normal cooling outdoor temperature (preferably higher than 75°F (24°C), and with all fans on. Unit must be allowed to run 15 minutes or longer so that the condenser fan staging and load is stabilized at normal operating discharge pressure. For best results, charge with condenser pressure at design conditions.

23 for packaged units and page 53 for remote evaporator units. An

Each circuit of the evaporator has a sight glass located in the liquid line. If the unit can be run at close to ARI conditions (95°F ambient temperature and 44°F chilled water), there should be no bubbles in the sight glass, but this does not necessarily mean that the unit is correctly charged. Charge until the superheat and subcooling temperatures are within range. The discharge superheat should be above 22 degrees F.

Procedure to charge an undercharged AGS unit:

1. If a unit is low on refrigerant, 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 can be needed to locate small leaks. Do not use oil/refrigerant detection additives.

2. Add the charge to the system only through the evaporator charging valve.

3. The charge must be added at the 100% slide valve position and above conditions.

4. Add sufficient charge to clear the conditions listed above under “Indications of a low

refrigerant R-134a charge”.

5. Overcharging of refrigerant will raise the condenser pressure and increase the condenser

subcooling.

Standard Controls

NOTE: A complete explanation of the MicroTech II controller and unit operation is contained in the

Operation Manual OM AGS. Thermistor sensors

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.

IMM AGSD3 73

Page 74

Evaporator entering water temperature - This sensor is located on the evaporator water inlet connection and is used for monitoring purposes and return water temperature reset control.

Evaporator pressure transducer circuit #1, 2 - This sensor is located on the suction side of the compressor (evaporator outlet) and is used to determine saturated suction refrigerant pressure and temperature. It also provides low pressure freeze protection.

Condenser pressure transducer circuit #1, 2 - the sensor is located in the discharge line and is used to read discharge pressure and saturated refrigerant temperature (calculated). The transducer will signal the controller to hold load or unload the compressor if a rise in head pressure occurs which is outside the MicroTech II controller setpoint limits. The signal is also used in the calculation of discharge superheat.

Liquid pressure transducer #1, 2 – located on the liquid line ahead of the EXV. It is used to determine liquid pressure and subcooling and is used to control the EXV.

Outside air - This sensor is located on the back of the control box. 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, 2 - The sensor is located in a well on the suction line. The purpose of the sensor is to measure refrigerant temperature and superheat.

Discharge line temperature circuit #1, 2 - The sensor is located in a well on the discharge line. It measures the refrigerant temperature and is used to calculate discharge superheat.

Demand limit - This requires a field connection of a 4-20 milliamp DC signal from an external source such as a building automation system. It will determine the maximum number of cooling stages that can 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 setpoint.

High condenser pressure control

MicroTech II control is equipped with high pressure transducers on each refrigerant circuit. The main purpose of the high pressure transducer is to maintain proper head pressure control. It also sends a signal to the MicroTech II control to unload the compressor in the event of an excessive rise in discharge pressure to 275 psig (1896 kPa). Also, MicroTech II control will inhibit additional circuit loading at 267 psig (1841 kPa). The high pressure switch trip setting is 282 psig (1944 kPa). The high pressure alarm is in response to the signal sent by the pressure transducer.

Mechanical high pressure equipment protection control

The high pressure equipment protection 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 set (non-adjustable) to open at 310 psig (2137 kPa) ±7 psig and reclose at 200 psig (1379 kPa) ±7 psig. Although the high pressure switch will close again at 200 psig (1379 kPa), the control circuit will remain locked out and it must be reset through the MicroTech II control.

The control is mounted on the rear of the compressor. See page

Compressor motor protection

65.

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 can indicate wiring or compressor motor problems. The overloads are manual reset and must be reset at the overload, as well as through the MicroTech II controller.

74 IMM AGSD3

Page 75

The compressors also have a solid state Guardister™ circuit that provides motor over temperature protection. The Guardister circuit has automatic reset and gives a Starter Fault (F75) that is cleared through the starter display and must also be reset through the MicroTech II control.

Head pressure control (standard)

The MicroTech II controller automatically cycles the condenser fans in response to condenser pressure. Each fan in a circuit is cycled independently for 4, 5 or 6 steps per circuit, depending on the unit size. This maintains head pressure and allows the unit to run at ambient air temperatures down to 35°F (1.7°C). The settings are adjustable through the controller.

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 the standard control is satisfactory down to outdoor temperatures of 35°F (-

1.7°C). Below this temperature, the VFD option is required to regulate the speed of the first fan on the circuit to adequately control the discharge pressure. The VFD option allows unit operation to 0°F (-17.8°C) outdoor temperature, assuming no greater than 5-mph wind.

Head pressure control (optional low ambient)

The optional low ambient control includes a variable frequency drive (VFD) on the first fan on each circuit. The remaining fans cycle based on discharge pressure. This control must be used for operation in ambient temperatures below 35°F (1.7°C) down to 0°F (-17.8°C).

NOTE: VFD and standard fan cycling will provide proper operating refrigerant discharge

pressures at the ambient temperatures listed for them, provided the coil is not affected by the existence of wind. Louvers must be utilized for low ambient operation if the unit is subjected to winds greater than 5 mph.

Compressor short cycling protection

The MicroTech II controller 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 20-minute start-to-start cycle. Both are adjustable through the MicroTech II control.

IMM AGSD3 75

Page 76

Controls, Settings and Functions

Table 52, Controls

DESCRIPTION FUNCTION SYMBOL SETTING RESET LOCATION

Compressor Heaters Compressor

Solenoid - Load Compressor Solenoid - Unload Evaporator Heaters Help prevent evaporator freeze-up HTR-EVAP 38oF (3.3oC) N/A Evap. Barrel Electronic Expansion Valve Board Electronic Expansion Valve Solid State Starter Thermistor Card Mechanical High High Pressure Switch MicroTech II Unit Controller MicroTech II Circuit Controllers

Oil Level Sensor Senses oil level in compressor OLS Fan VFD (Optional) Controls discharge pressure FAN VFD In controller code N/A Power Panel

Control Panel Heater

Lightning Arrestor High Oil Delta-P

Switch

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

Loads compressor LOAD N/A N/A

Unloads the compressor UNLOAD N/A N/A

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

To provide efficient unit refrigerant flow and control subcooling.

To provide motor temperature protection at about 220

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

To control unit functions. Refer to OM AGS. To control individual circuit functions. One per circuit. Refer to OM AGS.

Maintain controller operation To protect from high voltage spikes and

surges. Protects compressor from running with insufficient oil pressure

F (104oC).

HTR1-COMPR

EXV-DRIVER N/A N/A Control Panel

EXV In Controller Code N/A

K2 Fault

MHPR

UNIT CONTROLLER CIRCUIT CONTROLLER

HTR- CONTROL BOX

LA N/A N/A Power Panel

LPS Refer to OM AGS Auto

On, when compressor is off.

None, Inherent in design

Refer to OM AGS

N/A

N/A NC with oil

present

On at 40°F N/A Control Panel

N/A

Auto Power Panel

Auto Control Panel

Refer to OM AGS Refer to OM AGS

N/A

On the Compressor On the Compressor On the Compressor

In Main Liquid Line

Control Panel

Control Panel On

compressor

76 IMM AGSD3

Page 77

Troubleshooting Chart

Table 53, Troubleshooting

PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS

Compressor will not run.

Compressor Noisy or Vibrating

Compressor Overload K2 Tripped or Circuit Breaker Trip or Fuses Blown

Compressor Will Not Load or Unload

High Discharge Pressure

Low Discharge Pressure

Low Suction Pressure

Low Oil Level Trip

High Suction Pressure

1. Main power switch open.

2. Unit S1 system switch open.

3. Circuit switch, CS in pumpdown position.

4. Chilled water flow switch not closed.

5. Circuit breakers open.

6. Fuse blown or circuit breakers tripped.

7. Compressor overload tripped.

8. Defective compressor contactor or contactor coil.

9. System shut down by protection devices.

10. No cooling required.

11. Motor electrical trouble.

12. Loose wiring.

1. Compressor Internal problem.

2. Oil injection not adequate.

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. Defective capacity control solenoids.

2. Unloader mechanism defective.

1. Noncondensables in the system.

2. Fans not running.

3. Fan control out of adjustment.

4. System overcharged with refrigerant.

5. Dirty condenser coil.

6. Air recirculation from fan outlet into unit coils.

7. Air restriction into unit.

1. Wind effect or a low ambient temperature.

2. Condenser fan control not correct.

3. Low suction pressure.

4. Compressor operating unloaded.

1. Inadequate refrigerant charge quantity.

2. 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. Suction valve (partially) closed.

8. Glycol in chilled water system

1. Insufficient oil.

2. Low discharge pressure.

1. Excessive load - high water temperature.

2. Compressor unloaders not loading compressor.

3. Superheat is too low.

4. System overcharged

1. Close switch.

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

3. Check circuit status on MicroTech II display. Close switch. Check pump operation for flow.

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. Overloads are manual reset. Reset overload at button on overload. Clear alarm on MicroTech II display.

8. Check wiring. Repair or replace contactor.

9. Determine type and cause of shutdown and correct problem before attempting to restart.

10. Check control settings. Wait until unit calls for cooling.

11. See 6,7,8 above.

12. Check circuits for voltage at required points. Tighten all power wiring terminals.

1. Contact McQuayService.

2. Check that oil sight glass has oil visible during steady operation Check pressure drop across oil filter and oil separator sight glasses

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.

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

2. Contact McQuayService .

1. Remove noncondensables from the condenser coil after shutdown per EPA regulations.

2. Check fan fuses and electrical circuits.

3. Check that fan setup in the controller matches unit fan number. Check MicroTech II condenser pressure sensor for proper operation.

4. Check discharge superheat and condenser subcooling. Remove the excess charge.

5. Clean the condenser coil.

6. Remove the cause of recirculation.

7. Remove obstructions near unit.

1. Protect unit against excessive wind into vertical coils.

2. Check that fan setup in the MicroTech II controller matches unit fan number. Check VFD fan on units with VFD option.

3. See corrective steps for low suction pressure.

4. See corrective steps for failure to load.

1. Check liquid line sight glass. Check unit for leaks. Repair and recharge to clear sight glass at full load, all fans on, 75°F min OAT..

2. Check pressure drop across the filter-drier. Replace filter-driers.

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. Open valve.

8. Check glycol concentration

1. Check oil line and separator sight glasses.

2. Faulty EXV.

1. Reduce load or add additional equipment.

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

3. Check superheat on MicroTech II display. Check suction line sensor installation and sensor.

4. Check charge, an overcharge raises suction pressure

IMM AGSD3 77

Page 78

Periodic Maintenance Log

Date of inspection: Address: Facility/job name: City/State: Unit model number: Physical location of unit: Unit serial number: Service technical (name): Software identification: Operating hours: Compressor #1 Compressor #2 Number of starts Compressor #1 Compressor #2 Follow up service required: Yes No

General Actions to be Taken

Upper part of report completed: Yes No Fill in above Compressor operation: Yes No Explain all “No” checks

1. Mechanical operation acceptable (noise, vibration, etc.)?

2. Look at cycling and cooling, is unit controlling at set points?

3. No refrigerant leaks (full liquid sight glass)?

4. Liquid line moisture indicator shows dry system?

5. Proper condensing fan operation?

6. Condenser coil clean?

7. No corrosion or paint problems?

Compressor electrical operation:

8. Satisfactory electrical operation?

9. MicroTech II hardware operation satisfactory?

10. MicroTech II software operation satisfactory?

11. Unit status

12. Circuit status 1 % Capacity Circuit status 2 % Capacity

13. Water temperature – Evaporator: Entering/Leaving

Circuit #1 Circuit #2

14. No. of fan states active:

15. Evaporator pressure:

16. Condenser pressure:

17. EXV position – Steps open or percent open:

18. Superheat:

19. Subcooling:

20. Liquid line temperature:

21. Outside air temperature:

22. Leaving evaporator setpoint temperature:

23. Reset option programmed? Yes

24. Is VFD included? Yes

25. Current alarm: ___ ___ ___ Circuit #1 ______ Circuit #2 ______

26. Previous alarm – Show all: Alarm Type Date

Circuit #1

Circuit #2

27. Compressor starts See note 1 Circuit #1 _________________

Circuit #2 _________________

28. Compressor run hours Circuit #1 _________________

Circuit #2 _________________

No Ice storage unit? Yes No No VFD operation OK? Yes No

Data from MicroTech II Controller:

Data at Job Site:

29. Volts: L1_____ L2_____ L3_____

30. Amps: Comp #1 Ph 1____ PH 2____ PH 3____

31. Amps: Comp #2 PH 1____ PH 2____ PH 3____

32. Vibration – Read every six months using IRD (or equal) unfiltered at flat on top of motor end: ______ In/Sec Comp #1

______ In/Sec Comp #2

NOTE 1: If the number of starts exceeds the number of run hours, the unit is short cycling. This must be corrected as it can reduce compressor life.

78 IMM AGSD3

Page 79

IMM AGSD3 79

Page 80

All McQuay equipment is sold pursuant to McQuay’s Standard Terms and Conditions of Sale and Limited Product Warranty.

This document contains the most current product information as of this printing. For the most up-todate product information, please go to www.mcquay.com

(800) 432-1342 • www.mcquay.com IMM AGSD

McQuay AGS 140DH Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

General Description

Nomenclature

Inspection

Installation and Start-up

Handling

Figure 1, Required Lifting Method

Location

Service Access

Clearance Requirements

Figure 2, Clearance Requirements

Restricted Airflow

General

Figure 3, Coil and Fan Arrangement

Case 1, Building or Wall on One Side of One Unit

Figure 4, Unit Adjacent to Wall

Figure 5, Adjustment Factors

Figure 6, Two Units Side by Side

Figure 7, Adjustment Factor

Case 3, Three or More Units Side By Side

Figure 8, Three or More Units

Figure 9, Adjustment Factor

Figure 10, Open Screening Walls

Figure 11, Wall Free Area vs. Distance

Case 5, Pit/Solid Wall Installation

Figure 12, Pit Installation

Figure 13, Adjustment Factor

Vibration Isolator Location

Spring-Flex Locations

Table 1, Standard Efficiency with Aluminum Fin Condensers

Table 2, High Efficiency with Aluminum Fin Condensers

Table 3, Standard Efficiency with Copper Fin Condensers

Table 4, High Efficiency with Copper Fin Condensers

R-I-S Locations

Table 5, Standard Efficiency with Aluminum Fin Condensers

Table 6, High Efficiency with Aluminum Fin Condensers

Table 7, Standard Efficiency with Copper Fin Condensers

Table 8, High Efficiency with Copper Fin Condensers

Chilled Water Pump

Water Piping

System Water Volume

Variable Speed Pumping

Evaporator Freeze Protection

Table 9, Freeze Protection

Operating Limits:

Flow Switch

Table 10, Flow Switch Flow Rates

Figure 17, Typical Field Water Piping

Refrigerant Charge

Glycol Solutions

Table 11, Ethylene Glycol Factors

Water Flow and Pressure Drop

Table 12, Propylene Glycol Factors

Figure 18, Evaporator Pressure Drops

Minimum/Nominal/Maximum Flow Rates

Physical Data

Standard Efficiency

Table 13, Standard Efficiency, AGS 140DS – AGS 210DS

High Efficiency

Table 14, High Efficiency, AGS 140DE – AGS 190DE

Dimensions & Weights

Standard Efficiency

Figure 19, Dimensions, AGS 140DS – 170DS

Table 15, AGS140-170DS Shipping & Operating Weight, Center of Gravity Dimensions

Figure 20, Dimensions, AGS 190DS – 210DS

Table 16, AGS190-210DS Shipping & Operating Weight, Center of Gravity Dimensions

High Efficiency

Figure 21, Dimensions, AGS 140DE – 190DE

Table 17, AGS140-190DE Shipping & Operating Weight, Center of Gravity Dimensions

Lifting, Mounting, and Total Weights

Table 19, Lifting, Mounting and Total Weights, Packaged Unit, Copper Fins

Table 20, Lifting and Mounting Weights, Remote Evap, Aluminum Fins

Table 21, Lifting and Mounting Weights, Remote Evap Copper Fins

Electrical Data

Field Wiring

General