AAON LZ Series Installation Operation & Maintenance
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AAON LZ Series Installation Operation & Maintenance

Chillers and outdoor mechanical rooms
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Chillers and Outdoor Mechanical Rooms
Installation, Operation,
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings
exactly could result in serious injury,
death or property damage.
Be sure to read and understand the
installation, operation and service
instructions in this manual.
Improper
installation,
alteration, service or maintenance can
cause serious injury, death or property
damage.
A copy of this IOM should be kept with
the unit.
& Maintenance
adjustment,
LZ Series
WARNING
Do not store gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
 Do not try to light any appliance.
 Do not touch any electrical switch.
 Do not use any phone in your
building.
 Leave the building immediately.
 Immediately call you gas supplier
from a phone remote from the
building. Follow the gas supplier's
instructions.
 If you cannot reach your gas
supplier call the fire department.
Startup
and
service
performed by a Factory Trained
Service Technician.
must
be

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Summary of Contents for AAON LZ Series

  • Page 1 LZ Series Chillers and Outdoor Mechanical Rooms Installation, Operation, & Maintenance WARNING WARNING FIRE OR EXPLOSION HAZARD Do not store gasoline or other flammable vapors and liquids in the Failure to follow safety warnings vicinity of this or any other appliance.

  • Page 3: Table Of Contents

    Table of Contents Codes and Ordinances ....................... 19 Receiving Unit ........................... 19 Storage ............................20 Outdoor Mechanical Room ....................... 20 Wiring Diagrams ........................21 General Maintenance ......................... 21 Chiller Primary Pumping ......................21 Chiller Primary/Secondary Pumping ..................22 Condensing Boilers ........................22 Makeup Water ...........................
  • Page 4 Condenser Fan Motors ......................64 Water Make Up Valve ......................64 Water Treatment System ....................... 65 Sequence of Operation for LZ Series units without Diagnostics .......... 65 Sequence of Operation for LZ Series units with Diagnostics ..........66 Pump Maintenance ........................ 67 Fan Motor Maintenance ......................
  • Page 5 Figure 7 - LZ Base ........................27 Figure 8 - Lifting Points ........................ 28 Figure 9 - LZ Series Example Lifting Detail ................29 Figure 10 - Vestibule Exhaust Fan....................29 Figure 11 - Water Pipe Flashing Installation ................30 Figure 12 –...
  • Page 6 Figure 22 - Correct Joint Connection.................... 39 Figure 23 - Incorrect Joint Connection ..................39 Figure 24 - Typical Vertical Vent Piping ..................40 Figure 25 - Vertical Termination of Air Intake and Vent Piping ..........40 Figure 26 - Evaporative-Condensed Chiller Section Layout ............45 Figure 27 - Fan with the HUB on the top and RET on the bottom.
  • Page 7 AAON LZ Series Features and Options Introduction Energy Efficiency Installation and Maintenance • • Staged or Variable Speed R-410A Scroll Double Wall Rigid Polyurethane Foam Compressors Injected Panel Construction • • Oil-Free Magnetic Bearing R-134a Lighted Walk-In Service Vestibule •...
  • Page 8 Safety Attention should be paid to the following statements: NOTE - Notes are intended to clarify the unit installation, operation and maintenance. CAUTION - Caution statements are given to prevent actions that may result in equipment damage, property damage, or personal injury. WARNING - Warning statements are given to prevent actions that could result in equipment damage, property damage, personal injury or death.
  • Page 9 WARNING WARNING FIRE, EXPLOSION OR CARBON GROUNDING REQUIRED MONOXIDE POISONING HAZARD All field installed wiring must be Failure to replace proper controls completed by qualified personnel. could result in fire, explosion or Field installed wiring must comply with carbon monoxide poisoning. Failure to NEC/CEC, local and state electrical follow safety warnings exactly could code requirements.
  • Page 10 WARNING CAUTION PVC (Polyvinyl Chloride) and CPVC UNIT HANDLING (Chlorinated Polyvinyl Chloride) are vulnerable attack certain To prevent injury or death lifting chemicals. Polyolester (POE) oils that equipment capacity shall exceed unit are used in R-410A and other weight by an adequate safety factor. refrigerant systems will cause stress Always test-lift unit not more than 24 cracking of PVC or CPVC piping, even...
  • Page 11 CAUTION WARNING Some chemical coil cleaning Polyolester (POE) and Polyvinylether compounds are caustic or toxic. Use (PVE) oils are two types of lubricants these substances only in accordance used with R-410A R134a with manufacturer’s usage refrigeration systems. Refer to the instructions.
  • Page 12 LZ Series Feature String Nomenclature Model Options Unit Feature Options LZ A - 140 - C - A - 3 - F A C 0 E 0 0 0 0 : E 0 - 0 0 0 0 - 0 0 0 0 - 0 0 0 0 - 0 0 - 0 0 0...
  • Page 13 LZ Series Feature String Nomenclature Model Options Unit Feature Options 0 0 0 0 : E 0 - 0 0 LZ A - 140 - C - A - 3 - F A C 0 E - 0 0 - 0 0 0 0 - 0 0 0 0 - 0 0 - 0 0 0...
  • Page 14 LZ Series Feature String Nomenclature Model Options Unit Feature Options 0 0 - 0 0 LZ A - 140 - C - A - 3 - F A C 0 E 0 0 0 0 : E 0 - 0 0...
  • Page 15 LZ Series Feature String Nomenclature Model Options Unit Feature Options 0 0 - 0 0 0 0 - 0 0 - 0 0 LZ A - 140 - C - A - 3 - F A C 0 E 0 0 0 0 : E 0 - 0 0 0 0 - 0 0...
  • Page 16 LZ Series Feature String Nomenclature Model Options Unit Feature Options LZ A - 140 - C - A - 3 - F A C 0 E 0 0 0 0 : E 0 - 0 0 0 0 - 0 0 0 0 - 0 0 0 0 - 0 0 - 0 0...
  • Page 17 LZ Series Feature String Nomenclature Model Options Unit Feature Options LZ A - 140 - C - A - 3 - F A C 0 E 0 0 0 0 : E 0 - 0 0 0 0 - 0 0 0 0 - 0 0 0 0 - 0 0 - 0 0 0...
  • Page 18 29: Blank 35: Paint & Special Pricing Authorizations 0 = Standard B = Premium AAON Gray Paint Exterior E = Premium AAON Gray Paint Exterior + Shrink Wrap 30: Blank 0 = Standard X = Special Pricing Authorization + Premium AAON...

  • Page 19: Codes And Ordinances

    Codes and Ordinances LZ Series units have been tested and Receiving Unit certified, by TL, in accordance with UL When received, the unit should be checked Safety Standard 1995/CSA C22.2 No.

  • Page 20: Storage

    24 hours for units equipped with without the manufacturer’s consent may void crankcase heaters. the product warranty. Contact AAON Technical Support for assistance with handling damaged goods, repairs, and freight Never turn off the main power supply to the claims: (918) 382-6450.

  • Page 21: Wiring Diagrams

    CAUTION CAUTION FIELD WIRED CONNECTIONS Scroll compressors are directional and will be damaged by operation in Some units may require field wired the wrong direction. High pressure connections. Refer to the wiring switches on compressors have been diagrams contained within the unit to disconnected after factory testing.

  • Page 22: Chiller Primary/Secondary Pumping

    Condensing Boilers This flow switch closes when the velocity is AAON LZ chillers are available with factory above 0.7 feet per second. The closing flow installed condensing boilers. All boiler...

  • Page 23: Makeup Water

    initial startup, the boiler may have to be throughout the system, flashing could occur cycled several times to generate an adequate in the piping or the pump could cavitate. water level. There is an isolation valve on the inlet and outlet of the pressure-reducing valve for service.

  • Page 24: Pressure Relief Valve

    is correct, replace the pipe plug over the Dual Pumps charging valve for protection. When redundant pumping is required, factory installed dual pumps or two single pumps can Purge air from system before placing tank be ordered. A dual pump is a pump with two into operation.

  • Page 25: Pipe Insulation

    Outdoor Mechanical Room Placement open area under the condenser section. The AAON LZ Series is designed for outdoor applications and can be mounted at ground Unit specific curb drawing is included with level or on a rooftop.

  • Page 26: Figure 3 - Curb Mounting With Dimensions

    Figure 3 - Curb Mounting with Dimensions Figure 4 - Curb End Detail Figure 5 - Steel Mounting Rail with Dimensions...

  • Page 27: Figure 6 - Concrete Pad Mounting With Dimensions

    Figure 6 - Concrete Pad Mounting with Dimensions Figure 7 - LZ Base...

  • Page 28: Lifting And Handling

    Lifting and Handling Carefully lower and align unit with utility If cables or chains are used to hoist the unit openings. Lower the unit until the unit skirt they must be the same length and care should fits around the curb. Make sure the unit is be taken to prevent damage to the cabinet.

  • Page 29: Vestibule Exhaust Fan

    Figure 9 - LZ Series Example Lifting Detail Lifting slot locations are unit specific. Unit must be rigged at all marked lifting points. Vestibule Exhaust Fan Prior to unit operation of units with service vestibules the exhaust fan shipping support...

  • Page 30: Water Connection

    The maximum operating pressure refrigerants, even in trace amounts, in for AAON LZ Series unit is 125 psi. Install a PVC or CPVC piping system will the flashing provided by AAON according to result in stress cracking of the piping the steps in Figure 11.

  • Page 31: Temporary Drain - Evaporative Condenser

    A separate access door is also provided to the evaporator pumping package compartment. See Figure 36 for information on leak checking these doors. End Flashing Installation On all LZ Series units the cabinet width will overhang the shipping trailer on each side.

  • Page 32: Boiler Gas Connection

    Refer to feature B on the LZ Series personal injury, or death. unit feature string to determine which line of the table to use. For example, a unit with feature B = A3CC will have a 2”...

  • Page 33: Table 2 - Unit Gas Pipe Information, Feature B4 = A-J

    Table 2 - Unit Gas Pipe Information, Feature B4 = A-J Heating Feature Boiler Gas Header Input Inlet Gas Pipe Conn. Size Capacity Pressure Size Type (CFH) 6-14” W.C. C or D 6-14” W.C. C or D 1 1/2 KBN400 6-14”...

  • Page 34: Table 3 - Unit Gas Pipe Information, Feature B4 = K-N

    Table 3 - Unit Gas Pipe Information, Feature B4 = K-N Heating Feature Boiler Gas Header Inlet Gas Input Pipe Conn. Size Capacity Pressure Size Type (CFH) C or 2,000 2-5 psi 1 1/2 C or 4,000 2-5 psi FBN2000 C or 6,000 2-5 psi...

  • Page 35: Sidewall Direct Boiler Venting

    Sidewall Direct Boiler Venting For units with Lochinvar Knight XL and SYNC boilers (feature B4 = A, B, C, D, E, F, G, H, or K), the air intake and vent piping runs from each boiler through the sidewall of the unit into the supplied sidewall vent termination.

  • Page 36: Figure 17 - Typical Flue Vent Piping

    Figure 17 - Typical Flue Vent Piping...

  • Page 37: Vertical Direct Boiler Venting

    3. Attach vent piping to the flue pipe adapter on the boiler at one end and run through the sidewall of the unit at the other end. All Vent pipes and fittings are CPVC. Vent piping must be pitched at a minimum of 1/4 inch per foot back to the boiler.

  • Page 38: Figure 21 - Typical Vertical Air Intake Piping

    2. Attach air intake piping to the air inlet CAUTION connector on the boiler and run vertically through the roof of the unit. The air intake JOINT CONNECTIONS pipes and fittings will either be all PVC or all stainless steel components. The female end of each component incorporates a sealing gasket and a mechanical locking bond.

  • Page 39: Figure 22 - Correct Joint Connection

    3. Insert the male end into the female section. 5. Attach vent piping to the vent connector on Push the units together and turn them until the boiler and run vertically through the roof half of the bead on the male end is covered by of the unit.

  • Page 40: Figure 24 - Typical Vertical Vent Piping

    Figure 24 - Typical Vertical Vent Piping Figure 25 - Vertical Termination of Air Intake and Vent Piping...

  • Page 41: Boiler Condensate Drain

    5. After the crane rigging is removed, come- alongs should be attached to the nearest The AAON low ambient head pressure lifting lugs of both sections on each side control is used to operate a refrigerant system base rail. The two sections should then down to 0°F outside air temperature.

  • Page 42: Electrical

    start a system because the refrigerant will and signal wires in the same conduit can migrate to the cold part of the system cause electrical interference. (condenser) and make it difficult for refrigerant to flow. Table 4 - Nameplate Voltage Markings Nameplate Min/Max The low ambient system maintains normal...
  • Page 43 WARNING CAUTION CONVENIENCE OUTLETS AND Scroll compressors are directional SERVICE LIGHTS and will be damaged by operation in the wrong direction. High pressure Convenience outlet and service light switches on compressors have been circuits are wired to the incoming disconnected after factory testing. power side of the disconnect.

  • Page 44: Variable Speed Compressors

    Three phase voltage imbalance will cause Model LZ- Model LZ - Compressor motor overheating and premature failure. Air- Evap- VFD Range The maximum allowable imbalance is 5%. Cooled Condensed (Hz) 208V, 230V, 460V and 575V Units Voltage imbalance is defined as 100 times the 045, 055, 053, 061, 45-65Hz...

  • Page 45: Figure 26 - Evaporative-Condensed Chiller Section Layout

    cap. The pipes must be sealed to the cap once A field cutout must be made in the wall if the the piping is complete to prevent any leaks in evaporative-condensed chiller piping is to go the unit from penetrating into the building. through the unit wall.
  • Page 46 3. Before applying power, review the MCS Startup Controller manual provided with the (See back of the manual for startup form) chiller. Understand the operation of the controller display panel as well as the WARNING MCS Connect PC program. Electric shock hazard. Shut off all 4.

  • Page 47: Condenser Fan Pitch Adjustment

    Test the chiller operation by changing the are equipped with balancing valves on each Run/Stop switch to “Run”, and enabling one heat exchanger. Flow should be balanced system at a time. The compressors should not between the two evaporators by a hydronic be placed in “Manual On”...

  • Page 48: Figure 27 - Fan With The Hub On The Top And Ret On The Bottom

    circle, in the form of washers, and/or longer bolts, or an additional balancing nut. Bushing Bushing Number the blades and blade sockets, so that they are replaced into their original position. Bushing Mount Bushing Mount Figure 28 - Bushing Mount Location 4.

  • Page 49: Table 8 - Condenser Fan Pin Location (Bushing Mount)

    5-6 ft-lbs. of torque. Multi-Wing W Series Black Glass Reinforced Polypropylene Fan Blade Pitch Angle Setting Instructions Contact your local AAON representative to acquire the new pitch pins for the fan blades. Figure 31 - Pitch Insert Note original position of retaining plates, center boss and all hardware including 4.

  • Page 50: Boiler System Startup

    manuals provided with each boiler for Fan Assembly Bushings The fan assembly bushings should be proper operation of boiler controls. tightened to the specifications listed in the following table. 5. Verify that the rotation of all pumps is correct. The rotations have been checked Table 10 - Fan Assembly Bushing Torque at the factory, so if any motors that are not Specifications...

  • Page 51: Boiler Sequence Of Operations

    BMS system can access and modify all Maintenance necessary points. General Each individual boiler is provided with flow Qualified technicians must perform routine balancing valves. Flow should be balanced service checks and maintenance. This between the two evaporators by a hydronic includes reading recording...

  • Page 52: Suction Filter Removal Instructions

    Suction Filter Removal Instructions Refrigerant Liquid Line Filter Driers 1. Shut down operation of the unit Each refrigerant circuit contains a liquid line 2. Close both shut-off valves to isolate replaceable core filter drier. Replacement is the suction filter recommended when there is excessive pressure drop across the assembly or moisture is indicated in a liquid line sight glass.

  • Page 53: Evaporator/Heat Exchangers

    Unit being charged must be at or near full load conditions before adjusting the charge. Adjusting Refrigerant Charge All AAON chillers are shipped with a full Units equipped with hot gas bypass must factory charge. Periodically adjusting the have the hot gas bypass valve closed to get charge of a system may be required.

  • Page 54: Table 12 - Acceptable Refrigeration Circuit Values

    Checking Liquid Sub-cooling sub-cooling should be measured with both Measure the temperature of the liquid line as compressors in a refrigeration system it leaves the condenser coil. running. Read the gauge pressure at the liquid line close to the point where the temperature was Compare calculated superheat to Table 12 for taken.

  • Page 55: Table 13 - R-134A Refrigerant Temperature-Pressure Chart

    Table 13 - R-134a Refrigerant Temperature-Pressure Chart PSIG PSIG PSIG °F °F °F...

  • Page 56: Table 14 - R-410A Refrigerant Temperature-Pressure Chart

    Table 14 - R-410A Refrigerant Temperature-Pressure Chart F F F F F PSIG PSIG PSIG PSIG PSIG 78.3 142.2 234.9 364.1 540.1 80.0 144.8 238.6 369.1 547.0 81.8 147.4 242.3 374.2 553.9 83.6 150.1 246.0 379.4 560.9 85.4 152.8 249.8 384.6 567.9 87.2...

  • Page 57: Lubrication

    (see approved products list under the "Recommended Coil Cleaners” coverage. E-Coated Coil Maintenance Record document is available on the AAON section. website. Step two is to use the approved salt/chloride remover under the "Recommended Chloride WARNING Remover”...
  • Page 58 Recommended Chloride Remover – Step 2 100 psig to avoid damaging the unit and coil fin edges. CHLOR*RID® Concentrate, assuming it is used in accordance with the manufacturer's directions on the container for proper mixing, has been approved for use on E-coated coils CAUTION to remove chlorides/salts &...

  • Page 59: Microchannel Coil Cleaning

    middle). Work in sections/panels Using a pump up sprayer, fill to the ensuring that all areas are covered and appropriate level with potable water kept wetted. and add the correct amount of 7. Apply the cleaner to unit interior air CHLOR*RID®...
  • Page 60 #1 Simple Green performance fall off, and potentially leaks Simple Green is available from AAON Parts requiring coil replacement. Supply (Part# T10701) biodegradable with a neutral 6.5 pH. Documented routine cleaning Recommendation is to use it at a 4 to 1 mix.

  • Page 61: Evaporative-Condensed Chiller

    A spray that is too hard will bend the fins. Spray from the fan side AAON testing has determined that unless a of the coil. chemical has a neutral pH (6-8) it should not be used.

  • Page 62: Severe Operating Conditions Service

    Follow local and national codes in locating WARNING the evaporative-condensed chiller, but as minimum the sump must be 15 feet from the Batch-loading chemicals into the unit nearest intake. is NOT PERMITTED. The control system must regulate the chemical feed. WARNING The evaporative-cooled condenser Severe Operating Conditions Service...

  • Page 63: Warranties

    Cleanliness The coil is leak tested before shipment. Dirt and debris may accumulate in the sump AAON will not be responsible for loss of during shipping and storage. The sump refrigerant. It is the responsibility of the should be cleaned prior to startup to prevent installer to verify that the system is sealed clogging the water distribution system.

  • Page 64: Pump Operation

    Condenser Fan Motors If the water in the sump is below the low The direct drive condenser motors on AAON probe, it will not allow the condenser pump evaporative-condensed chillers are 1200 rpm or the sump heater to operate.

  • Page 65: Water Treatment System

    Sequence of Operation for LZ Series units treatment of evaporative-condensed chillers. without Diagnostics This system consists of a controller, three...

  • Page 66: Sequence Of Operation For Lz Series Units With Diagnostics

    3 psi and open at 1 psi. temperature is below 35°F. A Johnson Controls S350C measures the Sequence of Operation for LZ Series units water temperature in the pump discharge line. with Diagnostics If the sump water temperature exceeds These units operate the same way as 105°F, the cooling system will be shut down...

  • Page 67: Pump Maintenance

    ambient temperature is below 32°F, the door. This process will require at least two (2) condenser pump will not operate. As the people. ambient temperature increases, the condenser pump will activate at 35°F. As the ambient 1. Identify and locate the leak(s). temperature decreases, the condenser pump 2.

  • Page 68: Bearings - Lubrication

    Bearings - Lubrication Air Inlet Every 6 months or after a prolonged shut Inspect the air inlet louvers and mist down. Use waterproof, lithium based grease. eliminators into the condenser section on a Below 32°F - Esso Exxon or Beacon 325. monthly basis to remove any paper, leaves or Above 32°F - Mobil Mobilox EP2, Shell other debris that may block the airflow.

  • Page 69: Water Quality

    Guidelines eliminators. Approximately 22% of the total heat of rejection is accomplished with the de- 6.5 to 9.0 superheater. Water usage of the AAON Hardness as CaCO 500 PPM Max evaporative-condensed chiller Alkalinity as CaCO...

  • Page 70: Mechanical Cleaning

    525,000 ( Btu hr ⁄ ⁄ Replacement Parts = 2.63 gpm Parts for AAON equipment may be obtained from your local AAON representative. When Assuming 4 cycles of concentration: ordering parts reference the unit serial number and part number. Bleed Rate 2.63...

  • Page 71: Water Pressure Reducing Valve

    Appendix - Water Piping Component Information Water Pressure Reducing Valve Water Pressure Reducing Valves designed to reduce incoming water pressure to protect plumbing system components and reduce water consumption. Overview Standard construction includes Z3 sealed spring cage and corrosion resistant adjusting cage screws for outdoor/waterworks pit installations ...
  • Page 72 Capacity Note: Use a pressure gauge downstream to adjust and verify the pressure setting. Troubleshooting High System Pressure If the downstream system pressure is higher than the set pressure under no flow conditions, the cause could be thermal expansion, pressure creep or dirt/debris on the seat.

  • Page 73: Water Pressure Relief Valve

    seals and prevents any water from escaping Water Pressure Relief Valve from the system. Overview ASME Rated, Design Certified and Listed by The float vent can also operate as an anti- C.S.A vacuum device since it will permit air to enter the system when it must be drained.
  • Page 74 Operating Range: Minimum working pressure: 1.45psi (10 kPa) Maximum working pressure: 150psi (10 bars) Temperature Range: 33°F – 240°F (5°C – 116°C) Performance The figure below shows the installation of the vent valve for the venting of air while the fluid is circulating in the system and the required increase in pipe size in order to obtain proper separation of air from water.

  • Page 75: Pumps - Installation And Operating Instructions

    Maintenance No maintenance is normally necessary. However, if the FV-4M1 is disassembled for inspection or cleaning it is important that when re-assembling to ensure that the spring loaded lever properly engages under the float collar Dimensions – Weights: contact Armstrong quoting the equipment Pumps - Installation and Operating serial number.
  • Page 76 experienced, steps should be taken to With the straps in place, using a spacer bar if minimize contact or warn operators/users that necessary to protect the motor fan cover, the normal operating conditions will whole assembly can now be lifted securely. exceeded.

  • Page 77: Pump Piping - General

    impeller. On split coupled units, any air Pump Piping - General trapped in the casing as the system is filled CAUTION must be removed by the manual air vent in the seal flush line. Close-coupled units are Use Caution. Piping may carry high fitted with seal flush/vent lines piped to the temperature fluid.

  • Page 78: General Care

    significantly less than the nameplate head WARNING value it is typically permissible to throttle the discharge isolation valve until the actual Electric shock hazard. Before operating head is equal to the nameplate attempting to perform any service or value. maintenance pumping unit, disconnect power source to the driver,...
  • Page 79 Mechanical Seal CAUTION Mechanical seals require no special attention. The mechanical seal is fitted with a flush line. Double Check Prior to Startup The seal is flushed from discharge of the pump casing on split-coupled pumps and is flushed/vented to the suction on close Note coupled pumps.

  • Page 80: Dual Pump Specific Information

    Noise Levels Estimated Pumping Unit Sound Power Level, Decibels, A-Weighted, at 1 m (3 ft.) from unit. Vibration Levels Vertical In-Line pumps are designed to meet vibration levels set by Hydraulic Institute Standard HI Pump Vibration 9.6.4. Standard levels are as detailed below: Dual Pump Specific Information Procedure for Isolation of One Side 1.
  • Page 81 3. Allow the pressure to equalize in the two Locking casings, if necessary, by opening seal 1. Loosen discharge side set screw (11) to flush line interconnected valve. release the locking handle (3). 4. Unlock the discharge valve as per 2.
  • Page 82 the center pin in the locking arm recess, locking arm (4) towards the pump to be secure with set screw (11). isolated. The locking handle (3) should be raised to between 45 degrees and the Suction Valve vertical position. Manual Operation The suction side valve is designed for use as This handle should not be rotated past the a manually operated isolation valve.

  • Page 85: Horizontal And Vertical Expansion Tanks

    fluid has exited the diaphragm area and Horizontal and Vertical Expansion Tanks proper charging will occur. ASME PRE-PRESSURIZED DIAPHRAGM EXPANSION TANKS If the pre-charge adjustment is necessary, oil FOR HEATING & COOLING SYSTEMS and water free compressed air or nitrogen gas may be used.

  • Page 86: Suction Guides

    Installation The Suction Guides may be installed in any arrangement feasible the arrangement of the pump flange bolt-holes. Suction Guides Introduction Suction Guides are designed for bolting directly onto the suction flange of horizontal or vertical shaft centrifugal pumps. Operating Limits Inspection The suction guide is designed to be a four- Suction Guides are thoroughly tested and...

  • Page 87: Glycol Auto Fill Unit

    Temporary strainer must be removed Standard Unit following system clean up. When the system pressure drops below the set point on the pressure switch, the GLA After all debris has been removed from the pump is started adding fluid from the GLA system, or a maximum of 24 running hours, tank into the HVAC system.
  • Page 88 Glycol is sometimes subject to bacterial changeover. attack and can become slimy as a result. AAON recommend the addition of a suitable The other switches should first be set lower biocide. The dosage should be calculated on than the required pressure by turning the...

  • Page 89: Flo-Trex Combination Valve

    7. Close the system-isolating valve. Armgrip Flange Adapter Installation 8. Open suction isolating valve. 1. Position the two halves of the Armgrip 9. Switch on unit, initially both pumps will flange adapter on the valve body ensuring run. As the pressure reaches the pump that the lugs on each half of the flange control switch threshold, the pumps will adapters are located between the anti-...
  • Page 90 Note: Care should be taken to ensure that Table A1. Armgrip Flange Adapter Details 125 psi/150 psi 250 psi/300 psi the gasket is not pinched or bent between Valve Size Ductile Iron Bolt Ductile Iron Bolt flanges. Size Size 5. Tighten remaining nuts evenly by 2-1/2 following bolting instructions, so that the flange faces remain parallel (as shown in...
  • Page 91 Flow Measurement with the valve in the Wide Open position Step 2. With valve in fully open position, Where approximate indication of flow is locate the pressure differential on left hand acceptable the Flo-Trex valve can be used. side of the Flo-Trex Performance Curve with Valve in Full Open Position chart and extend Step 1.
  • Page 92 Step 2. Record the size of the valve and stem Flow Measurement with the valve in the throttled position position using the flow indicator scale. Calculate the percentage of valve opening Step 1. The valve stem with its grooved rings based on the number of rings at the fully open and positioning sleeve indicates the throttled position.
  • Page 93 Step 5. On the Flo-Trex Performance Curve Operation with Valve in Full Open Position locate the To assure tight shut-off, the valve must be differential pressure obtained in Step 3 and closed using a wrench with 25 to 30 ft-lbs of project line horizontally across to intercept torque.
  • Page 94 Step 8. Open valve to balance set point as Seat Replacement recorded in Step 1. Step 1. Drain the system and remove valve from piping. Note: On valve sizes of 2-1/2 inch and 3 Step 2. Remove the body bolts from the body inch, the full open position is 5 turns, using an Allen Key.
  • Page 95 Flo-Trex Cross Section...
  • Page 96 LZ Series Startup Form Job Name:_____________________________________________ Date:____________ Address:____________________________________________________________________ ____________________________________________________________________________ Model Number:_______________________________________________________________ Serial Number:___________________________________________ Tag:___________ Startup Contractor:____________________________________________________________ Address:____________________________________________________________________ _____________________________________________________ Phone:____________ Pre Startup Checklist Installing contractor should verify the following items. 1. Is there any visible shipping damage? 2. Is the unit level? 3.
  • Page 97 Water/Glycol System 1. Has the entire system been flushed and pressure checked? 2. Have isolation valves to the chiller been installed? 3. Have isolation valves to the boiler been installed? 4. Has the entire system been filled with fluid? 5. Has air been bled from the heat exchangers and piping? 6.
  • Page 98 Compressors/DX Cooling Check Rotation Head Suction Crankcase Number Model # Pressure Pressure Heater PSIG PSIG Amps Refrigeration System 1 - Cooling Mode Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Refrigeration System 2 - Cooling Mode Saturated Line Pressure Sub-cooling Superheat...
  • Page 99 Refrigeration System 4 - Cooling Mode Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Refrigeration System 5 - Cooling Mode Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Refrigeration System 6 - Cooling Mode Saturated Line Pressure Sub-cooling Superheat...
  • Page 100 Condenser Fans Alignment Check Rotation Nameplate Amps________ Number Condenser Pumps Check Rotation Number...
  • Page 101 Pumping Package Flow (gpm) Chiller Pump #1 Chiller Pump #2 Chiller Pump #3 Chiller Pump #4 Chiller Building Pump #1 Chiller Building Pump #2 Boiler Building Pump #1 Boiler Building Pump #2 Boilers Boiler Water In Temperature ________°F Boiler Water Out Temperature ________°F Boiler Amps Boiler...
  • Page 102 This log must be kept with the unit. It is the responsibility of the owner and/or maintenance/service contractor to document any service, repair or adjustments. AAON Service and Warranty Departments are available to advise and provide phone help for proper operation and replacement parts.
  • Page 103 Literature Change History July 2015 Initial version. August 2016 Added a warning to empty the evaporative-condensed chiller condenser tank before lifting. Included the size for the makeup water connection. Changed e-coated condenser coil cleaning to 100 psi. January 2017 Added vestibule exhaust fan section. October 2017 Added figure to show LZ bases.
  • Page 104 Parts: For replacement parts, please contact your local AAON Representative. It is the intent of AAON to provide accurate and current product information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability.

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