Page 2 - Table of Contents; BAS/McQuay Remote Panel Interface32; Manufactured in an; ISO Certified; facility
2 IMM AGS-DP-1 Table of Contents Introduction ....................................... 3 General Description................................... 3 Nomenclature ............................................ 3 Inspection .................................................. 3 Installation and Start-up.........
Page 3 - Introduction; General Description; or BACnet; Nomenclature; A G S - XXX D P; Inspection; Note
IMM AGS-DP-1 3 Introduction General Description McQuay AGS-DP air-cooled water chillers are complete, self-contained, automatic refrigerating units that include the latest in engineered components, arranged to provide a compact and highly efficient unit. Each unit is completely assembled, factory wi...
Page 4 - Installation and Start-up; WARNING; Sharp edges and coil surfaces are a potential injury hazard.; Handling; To lift the unit, lifting tabs with 2; DANGER; Figure 1, Required Lifting Method
4 IMM AGS-DP-1 Installation and Start-up Note : Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations, and experienced with this type of equipment. WARNING Sharp edges and coil surfaces are a potential injury hazard. Avoid cont...
Page 6 - Clearance Requirements; Figure 2, Clearance Requirements, AGS 226DP – 501DP
6 IMM AGS-DP-1 Clearance Requirements Figure 2, Clearance Requirements, AGS 226DP – 501DP 5’-0” if open fence or 50% open wall6’-0” if solid wall (see note 3 for pit) 5’-0” if open fence or 50% open wall6’-0” if solid wall (see note 3 for pit) No obstructions.Recommended arearequired for unitoperati...
Page 7 - Restricted Airflow; General; The MicroTech II
IMM AGS-DP-1 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 restrictin...
Page 8 - Case 1, Building or Wall on One Side of One Unit; Figure 4, Unit Adjacent to Wall
8 IMM AGS-DP-1 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 compr...
Page 9 - Case 2, Two Units Side By Side; Figure 6, Two Units Side by Side
IMM AGS-DP-1 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) it is necessary to adjust the performance of each unit; circuits adjoining each other are affected. If one of the two units also has a wall adjoining it, see Case...
Page 10 - Case 3, Three or More Units Side By Side; Figure 8, Three or More Units
10 IMM AGS-DP-1 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...
Page 11 - Case 3, Open Screening Walls; and 20 feet to equal 12 feet.
IMM AGS-DP-1 11 Case 3, 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 t...
Page 13 - NOTE; : All spring isolators have four same color springs per housing.; Isolator Dimensions
IMM AGS-DP-1 13 Vibration Isolators Vibration isolators are recommended for all roof-mounted installations or wherever vibration transmission is a consideration. The following section "Lifting and Mounting Weights" contains the location of unit lifting holes and the load at each location. Mo...
Page 16 - Lifting and Mounting Weights; Figure 16, AGS 226DP – AGS 251DP Lifting and Mounting Locations
16 IMM AGS-DP-1 Lifting and Mounting Weights Figure 16, AGS 226DP – AGS 251DP Lifting and Mounting Locations AGS226AGS251 AGS226AGS251 AGS226AGS251 AGS226AGS251 Figure 17, AGS 276DP - AGS 301DP Lifting and Mounting Locations 2 (51) Typical Spacing for Isolator Mounting (8) 88.0 (2235.2) Table 7, AGS...
Page 17 - Figure 18, AGS 351Dp – AGS 391DP Lifting and Mounting Locations; Figure 19, AGS 401DP - AGS 501DP Lifting and Mounting Locations
IMM AGS-DP-1 17 Table 8, AGS 226DP - AGS 301DP Lifting and Mounting Weights (Copper Fin) Lifting Weight for Each Point lb (kg) Mounting Loads for Each Point lb. (kg) AGS Model L1 L2 L3 L4 L5 L6 M1 M2 M3 M4 M5 M6 M7 M8 Lbs. 2499 3359 2879 2879 3359 2499 1920 2562 1918 2559 2559 1918 2562 1920 226DP (...
Page 19 - Chilled Water Pump; enabled; Drain Valves at Initial Start-up; Water Piping; CAUTION
IMM AGS-DP-1 19 Chilled Water Pump It is required that the starter(s) for the chilled water pump 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 no...
Page 20 - For protection down to 0
20 IMM AGS-DP-1 8. If the unit is used as a replacement chiller on a previously existing piping system, flush the system thoroughly prior to unit installation. Then regular chilled water analysis and chemical water treatment is recommended at equipment start-up. 9. In the event glycol is added to th...
Page 21 - Table 13, Freeze Protection
IMM AGS-DP-1 21 1. A power failure will prevent pumpdown and there is a potential for freezing outdoor equipment in systems using 100 percent water as the chilled fluid. 2. Unit shutdown due to a fault will cause immediate compressor shutdown without the pumpdown cycle. This situation can be remedie...
Page 22 - Flow Switch; Table 14, Flow Switch Flow Rates
22 IMM AGS-DP-1 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 10 ° F lower than the expected lowest ambient temperature. Inhibitor levels should be adjusted for solutions less than 25% g...
Page 23 - Water Connections
IMM AGS-DP-1 23 Figure 20, Flow Switch Figure 21, Typical Field Water Piping Vent Drain Vibration Eliminator Flow Switch Balancing Valve Gate Valve Gate Valve Water Strainer Vibration Eliminator Valved Pressure Gauge In Out Protect All Field Piping Against Freezing Notes : 1. Connections for vent an...
Page 24 - Pressure drop; consistent with local codes.; Table 15, Ethylene Glycol Factors
24 IMM AGS-DP-1 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 (Cap) correction factor to find the chiller’s capacity when using glycol. 2. Flow - To determine flow (or delta-T) knowing delt...
Page 26 - Physical Data; Table 17, Physical Data, AGS 226DP – AGS 27DP
26 IMM AGS-DP-1 Physical Data Table 17, Physical Data, AGS 226DP – AGS 27DP AGS MODEL NUMBER 226DP 251DP 276DP DATA Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2 BASIC DATA Unit Cap. @ ARI Conditions, tons (kW) 220.5 (774) 243.9 (856) 270.5 (951) Unit Operating Charge lbs (kg) 298 (135) 298 (135) 298 (135) 32...
Page 28 - Dimensional Data
28 IMM AGS-DP-1 Dimensional Data Figure 23, Dimensions, AGS 226DP – AGS 301DP Note : 1. S ee page 16 f or lif t ing loc at ions , m ount ing loc at ions , weight s and m ount ing loads . 2. A llow one-inc h m anuf ac t uring t oleranc e. DWG. 330556901-R3 LOCATION FAR SIDE 12.0 (304.8) POWER ENTRY A...
Page 30 - Wind Baffles and Hail Guards; Figure 25, Installation Sequence
30 IMM AGS-DP-1 Wind Baffles and Hail Guards Wind Baffles/Hail Guards are a field installed option that are used to stabilize unit operation in high wind areas and to assist in operation at low ambient temperatures. Figure 25 shows a typical panel assembly on an AGS unit. The actual number of panels...
Page 31 - Table 21, Packing List; Figure 26, Components
IMM AGS-DP-1 31 Table 21, Packing List Description Part Number Bubble Number Vertical Support Rib 074758501 1 Top Cover 330409401 2 Front Panel 330409501 3 ¼ - 20 x ½” Screw (Place in Poly Bag) 046093807 Figure 26, Components VERTICAL SUPPORT RIB TOP COVER FRONT PANEL REAR (AGAINST UNIT) TOP Rib, In...
Page 32 - BAS/McQuay Remote Panel Interface; BAS Interface; Protocols Supported; Table 23, Standard Protocol Data; The interface kits on the MicroTech II controller are as follows:; Remote Operator Interface Panel; IOM MT II
32 IMM AGS-DP-1 BAS/McQuay Remote Panel Interface BAS Interface Connection to the chiller for all building automation systems (BAS) protocols is at the unit controller. An optional interface module, depending on the protocol being used, may have been factory-installed in the unit controller (or it c...
Page 33 - Electrical Data; Field Wiring
IMM AGS-DP-1 33 Electrical Data Field Wiring General Wiring must comply with all applicable codes and ordinances. Damage to the equipment caused by wiring not complying with specifications is not covered under warranty. An open fuse or circuit breaker indicates a short, ground, or overload. Before r...
Page 38 - Electrical Data Notes; Allowable voltage limits; point power connections.; Optional Protocol Selectability Connection
38 IMM AGS-DP-1 Electrical Data Notes 1. Allowable voltage limits Unit nameplate 460V/60Hz/3Ph: 414V to 506V Unit nameplate 575V/60Hz/3Ph: 518V to 632V 2. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus 100% of RLA of all other loads in the circuit. 3. Single ...
Page 39 - Field Wiring Diagram; Figure 27, Typical Field Wiring Diagram, Circuit #1 Control Box
IMM AGS-DP-1 39 Field Wiring Diagram Figure 27, Typical Field Wiring Diagram, Circuit #1 Control Box Note: Field-wired control connections are made in the control panel for circuit 1 only. LABEL DWG. 330803901 REV. 0D TO COMPRESSOR(S) AND FAN MOTORS DISCONNECT (BY OTHERS) 3 PHASE POWER SUPPLY GND LU...
Page 40 - Solid State Starters; Operating Messages; Meaning
40 IMM AGS-DP-1 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. Th...
Page 41 - Fault Codes; Table 29, Fault Codes
IMM AGS-DP-1 41 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. OLL The motor thermal overload content has reached 100%, and the motor has stopped. The motor cannot be restarted until the overloaded m...
Page 42 - Starter Preventative Maintenance; During commissioning:
42 IMM AGS-DP-1 Num ber Descri pti on Control l ed S top Auto Reset 37 Current I m bal anc e Y Y 38 G round F aul t Y N 39 No Current A t Run N Y 40 S hort ed/ O pen S CR N N 41 Current W hi l e S t opped N N 47 S t ac k P rot ec t i on F aul t N Y 48 B ypas s Cont ac t or F aul t (on S T O P i nput...
Page 43 - Figure 28, Trouble Shooting Guide
IMM AGS-DP-1 43 Figure 28, Trouble Shooting Guide Low or Missing Line? Phase Order Fault Thermal Trip? Interlock Open? Wiring OK? High Ambient? In-Line OK? Circuit Breaker OK? Fuses OK? Does Problem Still Exist Bad Air Circulation? Motor Overloaded? Wiring OK? Swap Any 2 Power Leads Correct and Wait...
Page 46 - Table 30, Solid State Starter Settings
46 IMM AGS-DP-1 Table 30, Solid State Starter Settings No. Operating Parameter Default Range of Setting P1 Motor Full Load Amps (FLA) Note 1 1A 1 to 9999A P2 Motor Rated Load Amps (RLA) Note 2 1A 1 to 9999A P3 Motor Service Factor 1.08 1.00 to 1.99 P4 Motor Overload cless 10 Off, 1 to 40 P5 Initial ...
Page 47 - LED Display
IMM AGS-DP-1 47 Operation LED Display • View parameters, messages and faults • Shows software version on power-up Programming • Press PARAM to enter the menu and then UP or DOWN to reach the desired parameter. • Press ENTER to show the present value of the parameter. • Press UP or Down to change the...
Page 48 - Component Location; Major Component Location
48 IMM AGS-DP-1 Component Location Major Component Location Figure 29, Two-Compressor Unit Cutaway Oil Separator #1 Two-Circuit Flooded Evaporator Control/Power Panel Circuit #1 Condenser Section Circuit #2 Compressor #2 Control/Power Panel Circuit #2 Compressor #1
Page 49 - Figure 30, Piping Schematic
IMM AGS-DP-1 49 Figure 30, Piping Schematic DISCHARGE TUBING SIGHT GLASS AIR FLOW WATER OUT WATER IN LIQUID TUBING EXPANSION VALVE SCHRADER VALVE CHARGING VALVE SIGHT GLASS CONDENSER ASSEMBLY AIR FLOW AIR FLOW AIR FLOW CONDENSER ASSEMBLY CHARGING VALVE LIQUID SHUT-OFF VALVE SCHRADER VALVE FILTER DRI...
Page 50 - Power Panel
50 IMM AGS-DP-1 Power Panel Each compressor and its associated refrigerant circuit and controlled devices have a dedicated power and control system. They are contained in a duplex panel, the outer box containing the MicroTech II microprocessor with related accessories and the inner box containing th...
Page 51 - Control Panel
IMM AGS-DP-1 51 Control Panel The control panel for Circuit #1 is shown below. The panel for circuit #2 and #3 is similar but does not contain the Unit Controller. Distributed control architecture enhances unit reliability. Each compressor circuit has its own microprocessor controller so that if one...
Page 52 - Optional Features; Controls; Electrical
52 IMM AGS-DP-1 Optional Features There are a number of options that may or may not be present on any specific unit. These options can affect unit control operation and how a unit is installed and wired. Controls Ice Storage The unit is equipped with control logic to handle the low temperatures asso...
Page 53 - Unit
IMM AGS-DP-1 53 High- Short Circuit Current Protection The control panels and single point connection box (if ordered) will have the high short circuit current rating as shown below. A high interrupt circuit breaker is included. 115 Volt Convenience Outlet A 10.0 amp, 115-volt convenience outlet mou...
Page 54 - Start-up and Shutdown; NOTICE; until ready for start-up or the unit may start unintentionally.; Switches; There is a single; Temporary Shutdown; going through a proper shutdown/pumpdown sequence.
54 IMM AGS-DP-1 Start-up and Shutdown NOTICE McQuayService personnel or factory authorized service agency must perform initial start-up in order to activate warranty. CAUTION Most relays and terminals in the unit control center are powered when S1 is closed and the control circuit disconnect is on. ...
Page 55 - Start-up After Temporary Shutdown
IMM AGS-DP-1 55 CAUTION The unit has a one-time pumpdown operation. When the CS switches are in the Off position the unit will pump down once and not run again until the switches are moved to the On position. If the CS switches are in the On position and the load has been satisfied, the unit will do...
Page 57 - System Maintenance; Figure 31, Compressor Oil Filter
IMM AGS-DP-1 57 System Maintenance General On initial start-up and periodically during operation, it will be necessary to perform certain routine service checks. Among these are checking the liquid line sight glasses, evaporator sight glasses, and oil separator sight glasses, plus taking a full set ...
Page 58 - Electrical Terminals; power before continuing with following service.; Condensers; should be taken not to damage the fins during cleaning.; Liquid Line Sight Glass
58 IMM AGS-DP-1 Electrical Terminals DANGER Electric shock hazard and risk of personal injury or death exists. Turn off all power before continuing with following service. Periodically check electrical terminals for tightness and tighten as required. Condensers The condensers are air-cooled and cons...
Page 59 - Evaporator Sight Glass
IMM AGS-DP-1 59 NOTE : Exceeding normal charge can result in abnormally high discharge pressure and relief valve discharge, or cause low discharge superheat resulting in oil loss into the system. An element inside the sight glass indicates the moisture condition corresponding to a given element colo...
Page 60 - Preventative Maintenance Schedule; Monthly operations include all weekly operations.; Warranty Statement; Limited Warranty
60 IMM AGS-DP-1 Preventative Maintenance Schedule PREVENTATIVE MAINTENANCE SCHEDULE OPERATION WEEKLY MONTHLY (Note 1) ANNUAL (Note 2) General Complete unit log and review (Note 3) X Visually inspect unit for loose or damaged components and visible leaks X Inspect thermal insulation for integrity X C...
Page 61 - Service; forth by the EPA regarding refrigerant reclamation and venting.; injury or death. Multiple power sources can feed the unit.; Liquid Line Filter-Driers; Table 32, Liquid Line Filter-Drier Pressure Drop; The following is the procedure for changing the filter-drier core:
IMM AGS-DP-1 61 Service CAUTION 1. Service on this equipment is to be performed by qualified refrigeration personnel familiar with equipment operation, maintenance, correct servicing procedures, and the safety hazards inherent in this work. Causes for repeated tripping of equipment protection contro...
Page 62 - Compressor Slide Valves
62 IMM AGS-DP-1 1. On the circuit controller, under the "SET EXV SPs (2)", change the "Service Pumpdown" set point from "No" to "Yes". 2. If the circuit status is "Off:PumpDwnSw", move the circuit pumpdown switch from "Pumpdown and Stop" to "Auto...
Page 63 - Why does the AGS flooded evaporator use subcooling control?
IMM AGS-DP-1 63 Evaporator The evaporator is a flooded, shell-and-tube type with water flowing through the tubes and refrigerant flowing up the shell over the tubes. The tubes are internally enhanced to provide extended surface and turbulent flow of water through the tubes. Normally no service work ...
Page 66 - Charging Oil; Standard Controls; in the Operation Manual OM AGS.; Thermistor sensors; - This sensor is located on the evaporator water
66 IMM AGS-DP-1 Charging Oil The oil separator is equipped with two sight glasses that are used to indicate oil quantity. Oil charge determination must be done at, or near, full load. It may be normal to see the oil below the bottom sight glass while running at part load conditions due to oil laying...
Page 69 - Fan Stages with VFD Option; Table 33, Staging with VFD; Staging Up; Table 34, Forced Staging; Staging Down; Saturated Condenser Refrigerant
IMM AGS-DP-1 69 Fan Stages with VFD Option The VFD option must always be enabled. The first two fans are controlled by the fan VFD. This leaves 6 stages of fan control available with 8 fan circuits, and 4 stages available on 6 fan circuits. Although fans 5/6 and 7/8 are controlled by one contactor e...
Page 70 - active stage down deadband.; Low ambient start
70 IMM AGS-DP-1 When a stage down occurs, or the saturated temperature rises back within the Stage Down deadband, the Stage Down Error Accumulator is reset to zero. The accumulator is also held at zero after startup until either the outside ambient temperature is less than, or equal to 75 ° F (23.9 ...
Page 71 - Controls, Settings and Functions
IMM AGS-DP-1 71 Controls, Settings and Functions Table 35, Controls DESCRIPTION FUNCTION SYMBOL SETTING RESET LOCATION Compressor Heaters To provide heat to drive off liquid refrigerant when compressor is off. HTR1-COMPR On, when compressor is off. N/A On the Compressor Compressor Solenoid - Load Lo...
Page 72 - Troubleshooting Chart; Table 36, Troubleshooting
72 IMM AGS-DP-1 Troubleshooting Chart Table 36, Troubleshooting PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS Compressor will not run. 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 breaker...
Page 73 - Periodic Maintenance Log; General Actions to be Taken
IMM AGS-DP-1 73 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 Compressor #3 Number of starts Compre...