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Protocol™ Installation and

Service Manual

Proto_Aire Units

Summary of Contents for Proto-Aire

Page 1: ...9 20 2005 Installation Manual Hussmann Part 0385841 ...

Page 2: ...ts 33 REFRIGERATION PIPING 40 Overview 40 Refrigeration Line Piping 40 Refrigeration Cycle 41 Protocol with 3 Pipe Gas Defrost 42 Protocol with Heat Reclaim 43 Protocol with Split Suction 44 Oil Cycle 45 Liquid Injection 46 Vapor Injection 47 Field Piping 48 Water Loop Piping 49 Overview 49 Water Loop Guidelines 49 Pipe Connections 49 Isolation Valves 49 Strainers 49 Air Vent Valves 50 Tie Ins to ...

Page 3: ...ith Field supplied transformer 74 Terminal Connections 75 120V Circuit Logic 75 24V Circuits 75 Electronic Oil Level Control 75 Satellite Short Cycle Control Relay 76 Control and Compressor Wiring 77 PCS without Vapor Wiring 77 PCS with Vapor Wiring 78 CPC Danfoss Comtrol without Vapor Wiring 79 CPC Danfoss Comtrol with Vapor Wiring 80 Controller Wiring 81 PCS 81 CPC 82 CPC Einstein 83 Danfoss 84 ...

Page 4: ...tions 106 Suction Pressure Sensor 106 Suction Pressure Input 106 Temperature Input 107 All Additional Pressure Temperature Inputs 107 Programming the Optional In store Alarm and Auto Dialer 107 Troubleshooting Guide 108 Electrical Questions 109 Trouble Shooting Alarms 113 Service 115 Recommended Maintenance 116 Sample Protocol Checklist 118 ...

Page 5: ...oncealed the claim must be made to the carrier Apparent Loss or Damage If there is an obvious loss or damage it must be noted on the freight bill or express receipt and signed by the carrier s agent otherwise carrier may refuse claim The carrier will supply the necessary claim forms Concealed Loss or Damage When loss or damage is not apparent until after equipment is uncrated a claim for concealed...

Page 6: ...SSOR CODES VOLTAGE K 208 230 M 460 3 60 P 575 3 60 U 380 3 50 REFRIGERANT J 134a P R507 V R22 S 404a OF PARALLEL COMPRESSORS OF SATELLITE COMPRESSORS FRAME TYPE V Vertical H Horizontal A AIR COOLED W WATER COOLED P PROTOCOL L LOW PROFILE H HIGH EFFICIENCY PROTOCOL PROTO AIRE DESIGNATION The unit nomenclature is part of the UL code requirements and must be included on the legend as well as the data...

Page 7: ...an Proto Aire 145 lb Standard 200 option Field Supplied and Installed Water Components The Protocol comes equipped with a flow control shutoff valve for servicing the plate heat exchanger All other water loop components must be field supplied and installed A 16 20 mesh strainer 1 mm is required immediately upstream of each Protocol Accessibility All Standard Control Panel Doors require 40 inches c...

Page 8: ...each panel is held in place by two nuts Remove the nuts at the bottom of the panel then lift up and out Horizontal Units At the top a bracket in a channel supports each panel At the bottom each panel rests on two studs and is held in place by nuts Remove the nuts at the bottom of the panel then slide the panel out at the bottom and down 4 ...

Page 9: ...the top assembly forward until the back clips disengage Lift the top off Reverse procedure to install For some under table applications it may be desirable to remove the finished top panel to reduce the Protocol unit s height by two inches To separate the top panel assembly remove it and take out the screws holding the finished top panel to the sub panel The sub panel MUST be installed even when t...

Page 10: ...for lifting or moving the unit For strap rigging run the straps under the top level of compressor mounting channel Vibration Pads Vibration Isolation Pads are supplied with each Protocol unit To adjust for slightly uneven floors place 16 gauge galvanized steel shims between the vibration pads and the floor shims must be field supplied One vibration pad is installed under each upright channel Verti...

Page 11: ...Protocol Installation and Service Manual TYPICAL PIPING ELECTRICAL HOOKUP Vertical Units 7 ...

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Page 24: ...Protocol Installation and Service Manual Horizontal Units 20 ...

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Page 37: ...Protocol Installation and Service Manual Proto_Aire Units 33 ...

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Page 44: ...erial and use 35 silver solder for dissimilar metals Liquid and suction lines must be free to expand and contract independently of each other Do not clamp or solder them together Run supports must allow tubing to expand and contract freely Do not exceed 100 feet without a change of direction or an offset Plan proper pitching expansion allowance and P traps at the base of all suction risers Use lon...

Page 45: ...r glycol or air condenser depending on the type used The receiver acts as a vapor trap and supplies the Liquid Line with quality liquid refrigerant A Liquid Line Filter Drier removes water and other contaminants from the refrigerant The liquid branch line supplies liquid refrigerant to the Thermostatic Expansion Valve TXV which in turn feed refrigerant to the cases evaporator coils These coils pic...

Page 46: ...pass the TXV A pressure differential solenoid valve needs to be installed in the main liquid line to insure proper flow during defrost The pressure differential solenoid valve is factory installed in a vertical or horizontal Protocol Ensure that during defrost no more than 45 lbs or 20 of the total load is in defrost at any given time Case Suction Line Filter S S Case S Case Case Liquid Branch Lin...

Page 47: ...alve ensures that back flow through the heat reclaim coil is eliminated when heat reclaim is not used Refer to specific manufacturers guidelines for sizing reclaim coils In the case of water heat reclaim a 10 check valve should be used to bypass the water tank in the case that the pressure drop across the tank become excessive Suction Filter Angle Valve Liquid Branch Line Suction Branch Line Case ...

Page 48: ...rotocol unit The use of split suction allows for greater efficiency due to the fact that the compressors are operating closer to the desired suction temperature Suction Filters Liquid Branch Line Suction Branch Line Case Case Case Case Split Suction Headers Compressors Turba Shed Oil Separator Discharge Header Sight Glass Liquid Line Filter Drier Receiver Condenser 44 ...

Page 49: ...level control which feeds oil into the compressor through a solenoid valve Electronic oil regulators monitor oil levels The units are powered by a 24V power supply When the oil level in the compressor drops below sightglass the fill light comes on and the oil solenoid is energized If after 90 seconds the oil level does not rise above sightglass the unit opens the compressor control circuit If oil ...

Page 50: ...ssor has its own shutoff valve injection solenoid valve and supply hose When the compressor is off the solenoid valve is de energized via a current sensing relay mounted at the compressor contactor Note On units with remote air cooled condensers liquid refrigerant must be piped to the liquid injection stub out at the back of the Protocol unit Turba Shed Oil Separator Condenser Receiver Compressors...

Page 51: ...atic expansion valve and a heat exchanger which helps to ensure vapor is sent to the compressor as well as sub cooling the main refrigerant before it goes to the TXV and evaporator in the case T urba Shed O ilSeparator C ondenser R eceiver C om pressors L iquidL ine Filter D rier SuctionH eader C ase C ase C ase C ase Liquid Branch Line Suction Branch Line SightG lass SuctionL ine Filter V aporInj...

Page 52: ...rs are not required with Protocol Installations Protocol Produce Cases Produce Islands Produce Room Produce Islands Produce Cases Example of Improper Field Piping 48 Produce Room Produce Cases Produce Cases Produce Islands Produce Islands Protocol Example of Proper Field Piping ...

Page 53: ...ne type cutter to get a clean square cut remove any burrs Use Purple Primer on both pipe and fitting before gluing Apply glue to both pipe and fitting and join with a twisting motion Hold joint together for approximately 30 seconds to allow glue to set Allow to dry for 24 hours before putting in to service Where it is necessary to connect plastic and metal pipe DO NOT USE A THREADED CONNECTION A c...

Page 54: ...ts axial movement of the pipe Supports should provide a smooth bearing surface that conforms to the bottom of the pipe and should be a minimum of 2 inches wide Exposure to Direct Sunlight Piping that will be exposed to direct sunlight should be shaded or covered A thin layer of insulation is adequate for this Leak Check Check for leaks in the piping before startup by filling with pressurized water...

Page 55: ...e or propylene glycol such as Dow Chemical s Dowtherm SR 1 or Dowfrost Consult local regulations as to which type ethylene or propylene to use Propylene glycol is generally considered non toxic while ethylene glycol is somewhat toxic DO NOT USE AUTOMOTIVE GRADE GLYCOL Use a refractometer to check the glycol concentration at least once a year The pumping station has a low fluid pressure switch set ...

Page 56: ...col installation using direct return piping Two major factors stand out 1 Balancing to attain the correct water flow for each Protocol and 2 Balancing the system for Piping Head Loss Since these factors have nearly unlimited combinations finding the appropriate setting for each combination is unrealistic However if these factors are separated their effect on the system can easily be defined 52 ...

Page 57: ...for Each Protocol If the store were designed so that each Protocol condenser was supplied from and returned to a Very Large Box and the piping to each condenser was identical then flow rate GPM would be proportional to the Degrees of Closure on each Circuit Setter 53 ...

Page 58: ...Protocol Installation and Service Manual Very Large Box Very Large Box Pump Station Water Cooled Condenser 54 ...

Page 59: ...ows the installer to estimate the adjustments required for the Circuit Setters It is designed to provide a starting place Since each installation is unique all Protocol units must be carefully monitored during store startup Once all Protocol units are running the water loop must be checked and final balancing performed Table 1 shows a proportional Closure for the Circuit Setter based on Protocol G...

Page 60: ...ows a proportional Closure for the Circuit Setter based on Length of Piping Run Table 2 Length of Run Closure 1000 0 950 1 900 2 850 3 800 4 750 5 700 6 650 7 600 8 550 9 500 10 450 11 400 12 350 13 300 14 250 15 200 16 150 17 100 18 50 and below 19 56 ...

Page 61: ...rotocol in the Table 2 value row Add the two values logged for each Protocol Locate the lowest Total Subtract it from each Protocol Unit s Total to get Presetting Closure Important Note Length of Run includes both the supply and return piping Example Protocol A B C D E F G H I Table 1 Value 11 9 14 12 15 7 15 11 8 Table 2 Value 9 14 5 8 11 9 10 12 18 Total 20 23 19 20 26 16 25 23 26 Lowest Total 1...

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Page 63: ...mum Current Ampacity MCA and Maximum Over Current Protective Device MOPD Protocol components are wired as completely as possible at the factory with all work completed in accordance with the National Electrical Code All deviations required by governing electrical codes will be the responsibility of the installer The lugs on the convenience switch in the convenience switch box are sized for copper ...

Page 64: ...rotocol provides one NO NC pilot duty relay for remote alarm The field connection pins are located in the convenience switch panel Temperature Sensors and Defrost Termination Thermostats Use shielded and grounded Belden Cable 8762 or equivalent between control panel and case sensors or thermostats Important Shielded cable must be used The shield wire must be attached to the panel liner on the cont...

Page 65: ... legend for door switch kits M115 or M116 The switch is mounted to the cooler doorframe and controls the field installed liquid line solenoid and evaporator fans For Gas Defrost applications M116 includes a check valve to bypass the liquid line solenoid valve Panel Voltages The Protocol Control Panels contain voltages 24V PC Board POWERLINK Control Circuits Electronic oil level control 120V and 20...

Page 66: ...trolled systems Use a Digital Multimeter DMM to measure voltage amperage milliamperes or ohms If a range is exceeded the display will show OL overload Alarm LEDs One exterior and one interior Alarm LED assist in preliminary troubleshooting Alarm Light on Control Board Alarm Relay Light Exterior Alarm Light Condition ON OFF OFF ON ON ON OFF ON OFF OFF ON ON Okay Monitoring Alarm Switchback Compress...

Page 67: ...Protocol Installation and Service Manual Typical wiring diagram for Temperature Sensor and Klixon wiring Individual wiring may vary See page 102 for details on control types 63 ...

Page 68: ...Protocol Installation and Service Manual Electrical Legend 64 ...

Page 69: ...Protocol Installation and Service Manual Main Power Wiring 208V Two Wide Protocol 65 ...

Page 70: ...Protocol Installation and Service Manual 208V 5 or 6 Compressor Protocol 66 ...

Page 71: ...Protocol Installation and Service Manual 460V Two Wide Protocol 67 ...

Page 72: ...Protocol Installation and Service Manual 460V 5 or 6 Compressor Protocol 68 ...

Page 73: ...Protocol Installation and Service Manual 460V Two Wide Protocol with Factory installed transformer 69 ...

Page 74: ...Protocol Installation and Service Manual 460V Two Wide Protocol with Field supplied transformer 70 ...

Page 75: ...Protocol Installation and Service Manual 460V 5 or 6 Compressor Protocol with Field supplied transformer 71 ...

Page 76: ...Protocol Installation and Service Manual 600V Two Wide Protocol 72 ...

Page 77: ...Protocol Installation and Service Manual 600V 5 or 6 Compressor Protocol 73 ...

Page 78: ...Protocol Installation and Service Manual 600V Two Wide Protocol with Field supplied transformer 74 ...

Page 79: ...mpressor Contactor Coils Valve Solenoids External Alarm Light 24V Circuits The printed circuit control boards with attached relay coils are 24V The POWERLINKS are powered by a 24V DC supply used to control electric defrost heaters Each POWERLINK power supply will drive up to 5 POWERLINKS at once and require 2 seconds to recharge an internal DC capacitor between operations If the POWERLINK power su...

Page 80: ...essor goes into pumpdown mode It is a single shot time delay relay When the low pressure control opens on a decrease in pressure the short cycle control relay becomes energized and starts timing After 3 minutes regardless of the action of the low pressure control this relay will close thereby re engaging the control circuit and allowing the compressor to run again 76 ...

Page 81: ...Protocol Installation and Service Manual Control and Compressor Wiring PCS without Vapor Wiring 77 ...

Page 82: ...Protocol Installation and Service Manual PCS with Vapor Wiring 78 ...

Page 83: ...Protocol Installation and Service Manual CPC Danfoss Comtrol without Vapor Wiring 79 ...

Page 84: ...Protocol Installation and Service Manual CPC Danfoss Comtrol with Vapor Wiring 80 ...

Page 85: ...Protocol Installation and Service Manual Controller Wiring PCS 81 ...

Page 86: ...Protocol Installation and Service Manual CPC 82 ...

Page 87: ...Protocol Installation and Service Manual CPC Einstein 83 ...

Page 88: ...Protocol Installation and Service Manual Danfoss 84 ...

Page 89: ...Protocol Installation and Service Manual Comtrol 85 ...

Page 90: ...ools liquid refrigerant through a heat exchanger and injects vapor via a port on the compressor at a mid pocket interstage pressure The HE series is available in horizontal units and 3 wide vertical frame units with air or water cooled options However when selecting horizontal models they MUST BE accessible from the Top When sizing EVI Low Temp compressors DO NOT EXCEED 85 of capacity rating Also ...

Page 91: ...p cases and one for low temp cases Only the liquid to the low temp cases will be subcooled to 50 F The liquid to the medium temp cases will be at the condensing temperature Units with low temp ZFKV compressors must insulate the liquid line to the low temp cases walk ins coolers since the refrigerant is at a subcooled temperature Also suction line sizing should take into account the lower liquid te...

Page 92: ...circuit but it has an additional fan control circuit The fan control circuit ensures that the fans will not turn on during the defrost cycle It should be noted that off time defrost is achieved by turning the refrigeration valve off For unit cooler fan wiring see page 87 Defrost Circuit Control Off time Sequence of Operation Control Board energizes the Defrost Board Relay Coil which open the Main ...

Page 93: ...the Control Board Note Only 20 of the cases may be defrosted at once because of the requirement to keep a refrigeration load on the compressors to provide gas for defrost Electric Defrost Control Board locks out certain compressors to cover heater Amp draw Control Board energizes two Defrost Board Relay Coils for each Defrost Circuit 1 The first closes the POWERLINK 2 The second opens the Electric...

Page 94: ...ith Hot Gas Defrost When you have the special case of heat reclaim with hot gas it is necessary to interlock the Main Liquid Line solenoid wiring with the heat reclaim valve wiring This wiring will ensure that heat reclaim does not take place while defrost is occurring 90 ...

Page 95: ...hting Control Control Board energizes one output relay for each lighting circuit PCO control can have up to two lighting circuits Each lighting circuit has a schedule which determines when the output is turned on and when the output turns off 91 ...

Page 96: ...lowing drawing shows the wiring to control the fans in a unit cooler Defrost termination by klixon may connect back to the controller relay board based on individual customer specs See job specific board layout sheets and wiring diagrams for your individual installation 92 ...

Page 97: ...wiring for a typical Protocol with a remote condenser In the event that the condenser is ordered with control boards attached these boards must be connected back to the controller with communication cable in a manner appropriate for the individual controller The board addressing and the controller program should be checked to verify that the boards are addressed correctly and the controller is pro...

Page 98: ...ice Manual Proto Aire Fan Wiring The following diagram shows the fan electrical wiring present in a Proto Aire At the bottom of the diagram the receiver and crankcase heaters are shown which are common to each type of Proto Aire 94 ...

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Page 101: ...Protocol Installation and Service Manual POWERLINK Operation 97 ...

Page 102: ... from each Protocol is a continuous current loop fed around the store You will need to connect to the COMMON and NORMALLY OPEN alarm terminals located in the convenience switch box of each Protocol unit See wiring diagram for proper connection methods IMPORTANT The Paralleled connection between the In Store Alarm box and the Auto Dialer is polarity sensitive Follow the wiring connections shown 98 ...

Page 103: ...lled through a large ball valve at the highest point in the system Use a funnel when pouring or pumping the glycol into the loop Water may be added with a hose The funnel provides an air break and ensures no glycol contamination of the water supply Where the high point is not accessible glycol must be pumped into the system Water charging from a utility supply line will require anti backflow equip...

Page 104: ...th no pressure drop from 150 psig Evacuation Nitrogen and moisture will remain in the system unless proper evacuation procedures are followed Nitrogen left in the system may cause excessive head pressure Moisture causes TXV ice blockage wax build up acid oil and sludge formation Do not simply purge the system because this procedure is illegal expensive harmful to the environment and may leave mois...

Page 105: ...downs check Merchandisers Electrical requirements and power supply Electrical connections tight and clean Proper fan operation Thermostat setting Walk in Coolers and Freezers Electrical requirements and power supply Electrical connections tight and clean Proper fan operation Thermostat setting Water Loop Electrical requirements and power supply Electrical connections tight and clean Proper pump op...

Page 106: ...en the two sight glasses Important Notice to the Installer The compressors and the Turba Shed must be closely monitored during startup because the POE oil does not return from the evaporators as quickly as mineral oil Compressor Motor Rotation To check compressor rotation use the following procedure 1 Install gauges on suction and discharge headers Be aware of Satellite and Split Suction Protocol ...

Page 107: ...mostatic Expansion Valve superheat adjustment Electronic Pressure Regulator settings Defrost scheduling and timing Condenser flow balance High and low pressure controls Thermostat settings Adjustments to electronic controls Electronic oil level controls Thoroughly inspect all field piping while the equipment is running and add supports where line vibration occurs Be sure additional supports do not...

Page 108: ...nt of sensors to defrost circuits can be repeated for A3 through A6 NOTE In the following examples the refers to a defrost circuit and or Aux sensor between 1 and 6 The same screens apply for all circuit and sensor attachments Temperature Termination Digital Mode When an Auxiliary Sensor is used to connect a defrost termination thermostat Klixon device to the control in order to terminate defrost ...

Page 109: ...ated above the evaporators 2 The control board will simultaneously switch the appropriate output relay for the defrosting circuit which will de energize the suction solenoid and energize the hot gas solenoid allowing discharge gas to flow through the coil and return through the liquid line 3 The defrost cycle can be either temperature terminated using a thermostat or time terminated No drip cycle ...

Page 110: ...efrost Operation 1 To initiate a defrost the control board will de energize the specific circuit solenoid 2 After the preset time for defrost has elapsed the unit will energize the solenoid allowing normal refrigeration Sensor Applications Suction Pressure Sensor This suction pressure input provides the electronic controller the necessary information to cycle the compressors on and off to maintain...

Page 111: ...into the control Suction Pressure Reset Enable Disable Suction Pressure Reset Setpoint High Alarm Low Alarm When this temperature input is used to monitor and alarm on temperature of a given display case the following information should be used High Alarm Low Alarm Alarm Activation Enabled Disabled Alarm Delay Circuit Attachment All Additional Pressure Temperature Inputs This temperature input has...

Page 112: ...nswering machine or pager The choice and decision of phone numbers is at the customer s discretion Troubleshooting Guide This section is to aid in the troubleshooting of electrical and electronic considerations of the Protocol Refrigeration System The manual assumes that the reader has a working knowledge of the electronic controller communications platform used in networking the Protocol Electron...

Page 113: ...and ensure that the power wires are tightened down Important you should turn the compressor circuit breaker off before implementing this check Step A5 If the compressor wires are tight with the terminal box the compressor may be damaged internally and may need to be replaced Step A6 Problem appears to be located in the control circuit wiring most likely in one of the safeties Referring to the supp...

Page 114: ...clock is not running try changing the time to the correct setting You may want to consult the section on Electrical Noise contained within this manual Step B3 Enter the defrost circuit number you wish to turn ON and activate it Now exit and go to the Defrost Menu Observe the circuit you forced into defrost If the status indicates defrost proceed to Step B4 If the status does not indicate defrost g...

Page 115: ...peat this step Step B10 Electrical Wiring Check Use a digital voltmeter to verify where the circuit is being broken Power for defrost solenoids originates from the X1 terminal block passes through the fuse relay located on the defrost board and ends at the terminal block located in the power distribution block If the fuse on the defrost board has blown try replacing it with another fuse and repeat...

Page 116: ...ressure reading If the pressure reading of the gauge and the reading of the Hand Held controller is more than 2 psi check the pressure transducer offset which is available on the electronic control Step C2 Verify that the transducer range is set properly Select the pressure input you are currently having problems with and observe the transducer range Suction transducers should be selected for a 20...

Page 117: ...ted by the electronic control When a switchback alarm occurs the electronic control removes itself from control of the compressors Operation and cycling of the compressors will be controlled by a low pressure mechanical switch located inside the Protocol system which will cycle one half of the compressors The indication of alarm will be dependent upon which alarm device has been installed auto dia...

Page 118: ...serve the operation of compressor turning ON as indicated by X s The Protocol should begin to operate the compressors and suction pressure should be maintained If this does not occur you will need to further investigate the Protocol operation Alarm All Compressors Off This alarm is one of the three switchback alarms See the paragraph describing switchback The time delay for this condition is 60 mi...

Page 119: ...esting low side Always recapture test charge in approved recovery vessel for recycling The Water Loop should be tested for leaks using pressurized water DO NOT exceed 75 psig Service Compressor Replacement Before beginning removal of old compressor prepare replacement compressor as follows Verify Replacement compressor Electrical requirements Refrigerant application Capacity Piping hookup location...

Page 120: ...he system Isolate the Drier to be replaced and bleed off pressure into an approved recovery vessel Replace Pressurized leak test and bring back on line Recommended Maintenance Hussmann recommends the following maintenance for Protocol systems Twice a Month 1 Review store operating data a Graph the various temperatures and pressures for each unit look for unusual trends b Look through the alarm men...

Page 121: ...d be checked 4 If equipped with air cooled condenser inspect and clean as necessary Every Two Years Sample the closed loop fluid and have it analyzed If this fluid contains a Dow product Dowtherm or Dowfrost Dow can perform the analysis Call Dow at 1 800 447 4369 and ask for a fluid sampling kit Use only Mobil EAL Arctic 22 CC ICI Emkarate RL 32CF OR Copeland Ultra 22 CC Turba Shed is shipped with...

Page 122: ...urba Shed Between Glasses Pressure Differential Condenser Head Pressure 214 9 psig Water Temperature In OK Water Temperature Out OK Refrigerant 404a Receiver Level Liquid Sight Glass Foamy Compressor No 1 2 3 4 5 6 Model No ZF13K4 ZH13K2 ZH13K2 ZH13K2 ZF13K4 ZF15K4 Discharge Temperature 173 166 166 165 162 165 Amp Draw 10 2 10 7 10 8 11 2 10 2 12 5 Shell Temp at Oil Connect hot hot warm warm warm ...

Page 123: ...ength Superheat Suction Set Point Suction Pressure Suction Temperature Oil Turba Shed Pressure Differential Condenser Head Pressure Water Temperature In Water Temperature Out Refrigerant Receiver Level Liquid Sight Glass Compressor No 1 2 3 4 5 6 Model No Discharge Temperature Amp Draw Shell Temp at Oil Connect Float or Oil Connect Oil Control Magnet Cond Controller Alarms Time Date Displayed Note...

Page 124: ...le obligation under this warranty shall be limited to a period not to exceed five years from date of factory shipment On Hussmann refrigeration systems an additional 4 year extended warranty for the motor compressor assembly is available but must be purchased prior to shipment to be in effect Hussmann reserves the right to inspect the job site installation and reason for failure The motor compress...

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