Gardner Denver ELECTRA-SAVER Operating And Service Manual
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Gardner Denver ELECTRA-SAVER Operating And Service Manual

Stationary base–mounted compressor with optional es+ controller
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13–9/10–641 SP
GARDNER DENVER
7th Edition
September, 1995
ELECTRA–SAVER
ELECTRA–SAVER II
STATIONARY BASE–MOUNTED
COMPRESSOR
WITH OPTIONAL ES+ CONTROLLER
DOMESTIC MODELS
40 – 100 HP
EBH, EBM, EBP & EAP
INTERNATIONAL MODELS
EBM_ _B – 60 – 100 HP (45 – 75 KW)
OPERATING AND
SERVICE MANUAL

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Summary of Contents for Gardner Denver ELECTRA-SAVER

  • Page 1 13–9/10–641 SP GARDNER DENVER 7th Edition September, 1995 ELECTRA–SAVER ELECTRA–SAVER II STATIONARY BASE–MOUNTED COMPRESSOR WITH OPTIONAL ES+ CONTROLLER DOMESTIC MODELS 40 – 100 HP EBH, EBM, EBP & EAP INTERNATIONAL MODELS EBM_ _B – 60 – 100 HP (45 – 75 KW)
  • Page 2 They are ready to respond and assist you by pro- Your authorized distributor can support your Gardner viding fast, expert maintenance and repair services. For the location of your local authorized Gardner Denver Air Compressor distributor refer to the yellow pages of your phone directory or contact: Distribution Center: Factory: Gardner Denver Machinery Inc.
  • Page 3 FOREWORD Gardner Denver Rotary Screw compressors are the result of advanced engineering and skilled manufacturing. To be assured of receiving maximum service from this machine the owner must exercise care in its operation and main- tenance. This book is written to give the operator and maintenance department essential information for day–to–day operation, maintenance and adjustment.
  • Page 4 INSTRUCTIONS FOR ORDERING REPAIR PARTS When ordering parts, specify Compressor MODEL, required per unit, quantity is indicated in parenthesis. Method of Cooling, HORSEPOWER and SERIAL SPECIFY EXACTLY THE NUMBER OF PARTS RE- NUMBER (see nameplate on unit). The Serial Number QUIRED.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS REMANUFACTURED AIR ENDS ..............FOREWARD .
  • Page 6 INDEX Compressor ....... Actuator, Turn Valve ..... . . Addition of Oil Between Changes .
  • Page 7 INDEX Water–Cooled Units ..... Electric Motor Grease Recommendations ..Electric Motor Regreasing Interval ... Low Demand Mode Operation .
  • Page 8 INDEX Oil Cooler Oil Pressure Differential ..Relief Valve ......Remote On/Off .
  • Page 9 INDEX Transformer, Control ..... . . Other ....... . . Power Failure .
  • Page 10 LIST OF ILLUSTRATIONS Figure # Description Page Figure 1–1 Compression Cycle ............Figure 1–2 Starter Box .

  • Page 11: Section 1, General Information

    SECTION 1 GENERAL INFORMATION FIGURE 1–1 – COMPRESSION CYCLE COMPRESSOR – The Gardner Denver Rotary Screw ervoir (C). Each rotor cavity follows the same “fill–com- compressor is a single stage, positive displacement press–discharge” cycle in rapid succession to produce rotary machine using meshing helical rotors to effect a discharge air flow that is continuous, smooth and compression.

  • Page 12: Figure 1-2 Starter Box

    FIGURE 1–2 – STARTER BOX FIGURE 1–3 – PACKAGE – CONTROLLER & STARTERS FIGURE 1–4 – PACKAGE – DRIVE MOTOR & AIR FILTER 13–9/10–641 SP Page 2...

  • Page 13: Figure 1-5 Package - Oil Filter, Oil Level Gauge, Mixing Valve, Minimum Pressure Valve

    OIL LEVEL GAUGE FIGURE 1–5 – PACKAGE – OIL FILTER, OIL LEVEL GAUGE, MIXING VALVE, MINIMUM PRESSURE VALVE & CHECK VALVE FIGURE 1–6 – PACKAGE – AIR/OIL FLOW DIAGRAM 13–9/10–641 SP Page 3...
  • Page 14 SAFETY PRECAUTIONS Safety is everybody’s business and is based on your use of good common sense. All situations or circumstances cannot always be predicted and covered by established rules. Therefore, use your past experience, watch out for safety hazards and be cautious. Some general safety precautions are given below: Failure to observe these notices could result in injury to or death of personnel.
  • Page 15 Failure to observe these notices could result in damage to equipment. Stop the unit if any repairs or adjustments on or around the compressor are required. Disconnect the compressor unit from its power source, tag and lockout be- fore working on the unit – this machine is automatically controlled and may start at any time.
  • Page 16 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077 13–9/10–641 SP Page 6...
  • Page 17 DECALS 216EAQ077 222EAQ077 217EAQ077 221EAQ077 208EAQ077 13–9/10–641 SP Page 7...

  • Page 18: Section 2, Installation

    SECTION 2 INSTALLATION GENERAL – On receipt of the unit, check for any dam- LOCATION – The compressor should be installed, age that may have been incurred during transit. Report whenever possible, in a clean, well–lighted, well–venti- any damage or missing parts as soon as possible. lated area with ample space all around for mainte- nance.

  • Page 19: Figure 2-2 Air Flow Chart

    Minimum Air Flow * For Compression And Cooling – Cubic Feet/Minute (Cubic Meters/Minute) If the compressor unit base is raised HP (KW) Air Cooled Water Cooled above floor level, the space between the floor and the base bottom must be 40 &...

  • Page 20: Figure 2-3 Cold Weather Installation

    Refer to Engineering Data Sheet 13–9–411, available Monitor the unit carefully during start–up and op- from an authorized Gardner Denver distributor, for the eration to be sure it is functioning normally. advantages of using the heat recovered from rotary compressors.

  • Page 21: Figure 2-4 Inlet Line Lengths

    Length of Inlet Line Diameter of Pipe Size 0 to 10 Feet (0 to 3 Meters) ........Same as Compressor Inlet Opening 10 to 17 Feet (3 to 5 Meters) .

  • Page 22: Figure 2-6 Aftercooler Approximate Water Flow

    AFTERCOOLER (DOMESTIC) Approx. Water Temperature to Heat Exchanger Water Pressure Gallons/minute Maximum Drop @ 90 F Water Flow Water Temp. Model 60 F. 70 F. 80 F. 90 F. GPM* 40 HP EBHSHB 26.0 50 HP EBHSJB 26.0 Less than 1 PSI 60 HP EBMSKC 26.0...

  • Page 23: Figure 2-7 Series Piping

    * (OPTIONAL) WATER CONTROL VALVE AND WATER SHUTOFF VALVE MUST BE ORDERED SEPARATELY. FIGURE 2–7 – SERIES PIPING FIGURE 2–8 – PARALLEL PIPING blowdown valve piped to the outside with a pipe size the (43 C). If water cooler than 60 F is used, high water same as the blowdown valve outlet connection.
  • Page 24 justment instructions and maximum allowable lubricant temperature. Failure to properly ground the com- ELECTRICAL WIRING – Standard Units – The Elec- pressor package could result in con- tra–Saver compressor is factory wired for all starter troller malfunction. to motor and control connections for the voltage speci- fied on the order.
  • Page 25 ELECTRIC MOTOR GREASE RECOMMENDATIONS (–30 to 50 C) MANUFACTURER TRADE NAME CHEVRON SRI #2 SHELL DOLIUM R EXXON UNIREX #2 EXXON POLYREX ELECTRIC MOTOR REGREASING INTERVAL Relubrication Type of Service Typical Examples Rating Interval Up to 150 HP (112 KW) 18 Months Standard One–...

  • Page 26: Section 3, Starting & Operating Procedures

    Air Filter – Inspect the air filter to be sure it is clean red “ADD OIL” range. Do not mix different type and tightly assembled. Refer to Section 6, “Air Fil- oils. The unit is shipped filled with Gardner Denver ter,” page 57, for complete servicing instructions. AEON 9000 SP Lubricating Coolant which is Be sure the inlet line, if used, is tight and clean.
  • Page 27 System Pressure – Set the controls to the de- Check all screws and latches for tightness. Be sired load pressure. DO NOT EXCEED THE sure doors are closed and latched. MAXIMUM OPERATING PRESSURE ON THE STARTING THE UNIT – Observe the following starting COMPRESSOR NAMEPLATE.

  • Page 28: Section 4, Controls & Instrumentation

    SECTION 4 CONTROLS & INSTRUMENTATION GENERAL DESCRIPTION – The Gardner–Denver the key is released, the control will resume its normal rotary screw compressor is prewired with all controls, operation as required. motor, and starter for the voltage and horsepower at An optional control may be wired into the “Auto Sentry the time of ordering.

  • Page 29: Figure 4-1 Auto Sentry-Es+ Display

    ing periods of moderate to high demands, this mode is The automatic time delay is adjustable from 5 to 20 identical to the constant–run mode described above. minutes. If the controller operates unloaded for this pe- riod with no demand, the compressor drive motor is During low demand periods, the controller will open the halted to eliminate its power consumption.
  • Page 30 AUTO–SENTRY –ES+ CONTROL DISPLAY warrant shutting down the compressor. Some of these are normal maintenance procedures, and are intended The display above the keypad is used to provide oper- to serve as a reminder to perform routine service. Oth- ating information to the user. If a shutdown has oc- ers are conditions which can reduce the maximum curred, the display will indicate the cause.
  • Page 31 er operation. These are disabled if no sensor is installed. Connection Failure – The ES+ controller checks input connectors and will shutdown if they become un- Machine damage will occur if com- plugged. pressor is repeatedly restarted after Other Shutdowns – The controller runs continuous high temperature stops operation.

  • Page 32: Figure 4-2 Flowchart For Set-Up Programming, Auto Sentry-Es

    FIGURE 4–2 – FLOW CHART FOR SET–UP PROGRAMMING AUTO SENTRY–ES+...
  • Page 33 The “SET” switch is located on the bottom of the con- function is to prevent too frequent motor starting, troller chassis, on the side behind the program keypad and to allow the motor a ’cool–down’ period before area. If the switch is toward the center of the controller, stopping.
  • Page 34 If the advisory message is on, it must be cleared Normally it is desirable to set this to the same val- as noted in step 1. ue on all sequenced units to equalize running hours. Different values may be programmed, if This completes the maintenance adjustments.
  • Page 35 errors will be encountered if ’zeroing’ is done with In the top line, “SYSTEM VOLUME” is displayed. pressure at the transducer. If large errors are de- The bottom line may be selected as “SMALL”, tected, the controller will demand that the trans- “MEDIUM”, or “LARGE”.
  • Page 36 mote starters may require a little more time. Set draw. This will heat the motor beyond its design, and back to zero to proceed to the next step. will normally trip the overload relay to prevent motor failure. The ES+, however, will automatically reduce In the top line, “AUX SD MESSAGE”...
  • Page 37 loaded compressors. This storage may be an air re- The receiver should also be sized to prevent excessive ceiver, or may be the volume of air in a large distribution drops or rapid rises in pressures during the operation system. In either case, the compressors must be piped as described below.
  • Page 38 it must have its pigtail plugged into the unused one step, and so forth until all units are back into the se- jack. All installations will have two such units. quence mode. During this procedure, the system is not deprived of air. Program all members of the system, as described in This is due to one of the outstanding features of the the programming procedure on previous pages.
  • Page 39 Delay timer does not begin timing until the preceding show ’minor’ pressure variations between one com- member of the system is loaded. pressor’s discharge point and another compressor’s discharge. These points will also vary from the actual system storage (normally the air storage receiver). SEQUENCED SYSTEM CHECKOUT The “AUTO SENTRY–ES+”...
  • Page 40 If the compressor was already stopped in automatic or clude all pressures and temperatures, and a reports of sequence modes, it will remain stopped and will not re- internal service data. This is accessible with a PC or start until the contact is closed. The display will flash PLC with an appropriate communications port.

  • Page 41: Figure 4-3 Schematic Tubing Diagram

    211ECM797–A (Ref. Drawing) FIGURE 4–3 – SCHEMATIC TUBING DIAGRAM Blowdown Valve (FIGURE 4–3) – This valve normal- ly is used for control functions, but also serves to relieve reservoir pressure following a shutdown. The blow- down valve is a two–way solenoid valve which is piped into the oil reservoir outlet ahead of the minimum pres- sure valve.

  • Page 42: Figure 4-6 Inlet Valve

    The internal parts will come out after the cap has been removed. Repair kits are available from your local authorized Gardner Denver Machinery distributor. Inlet Valve (FIGURE 1–4, page 2, and FIGURE 4–6) – The Inlet valve restricts the inlet to control delivery and closes to unload the compressor.

  • Page 43: Figure 4-8 Turn Valve - Turn Valve Units Only

    vent damage to the inlet valve from “slamming.” The regulator should be set for 25–30 psig. Shuttle Valve (FIGURE 4–7) – Also known as a double check valve, the shuttle valve is a device which will take two (2) supply signals and allow the one with the highest pressure to pass through.
  • Page 44 the actuator. When looking at the rear of the compres- only – use the keypad “STOP/RESET” for normal con- sor, the adjusting screw on the right on the compressor trolled stopping. adjusts the fully closed (full–load) position of the valve. The full load position of the actuator may be checked by removing the adjusting screw at the unloaded end of the actuator (left side of the compressor) and using...
  • Page 45 heaters should be selected and adjusted based on the Discharge motor nameplate amps and the instructions located in- Compressor Manifold side the cover of the enclosure. Wye–delta starters Delivery Inlet Valve Turn Valve Pressure employ three contactors which are controlled sequen- tially to provide low current starting.

  • Page 46: Figure 4-9 Control Schematic - Compressor Unloaded - Constant Speed Mode

    225ECM797–A (Ref. Drawing) FIGURE 4–9 – CONTROL SCHEMATIC – COMPRESSOR UNLOADED – CONSTANT SPEED MODE EBH & EBM UNITS ONLY...

  • Page 47: Figure 4-10 Control Schematic - Compressor At Full Load - Constant Speed Mode

    226ECM797–A (Ref. Drawing) FIGURE 4–10 – CONTROL SCHEMATIC – COMPRESSOR AT FULL LOAD – CONSTANT SPEED MODE EBH & EBM UNITS ONLY...

  • Page 48: Figure 4-11 Control Schematic - Compressor Unloaded - Low Demand Mode Or Auto Mode

    227ECM797–A (Ref. Drawing) FIGURE 4–11 – CONTROL SCHEMATIC – COMPRESSOR UNLOADED – LOW DEMAND MODE OR AUTO MODE EBH & EBM UNITS ONLY...

  • Page 49: Figure 4-12 Control Schematic - Compressor At Full Load, Turn Valve Units Only

    214ECM797–A (Ref. Drawing) FIGURE 4–12 – CONTROL SCHEMATIC – COMPRESSOR AT FULL LOAD EAP UNITS ONLY...

  • Page 50: Figure 4-13 Control Schematic - Compressor Fully Unload - Low Demand Mode Switch Off, Turn Valve Units Only

    215ECM797–A (Ref. Drawing) FIGURE 4–13 – CONTROL SCHEMATIC – COMPRESSOR FULLY UNLOADED – LOW DEMAND MODE SWITCH OFF EAP UNITS ONLY...

  • Page 51: Figure 4-14 Control Schematic - Compressor Fully Loaded - Low Demand Mode Switch On

    216ECM797–A (Ref. Drawing) FIGURE 4–14 – CONTROL SCHEMATIC – COMPRESSOR FULLY LOADED – LOW DEMAND MODE SWITCH ON EAP UNITS ONLY...

  • Page 52: Figure 4-15 Wiring Diagram - 214Ecp546

    FIGURE 4–15 – WIRING DIAGRAM – 214ECP546 (WYE–DELTA – EBM & EBP UNITS ONLY)

  • Page 53: Figure 4-16 Wiring Diagram - 218Ecp546

    FIGURE 4–16 – WIRING DIAGRAM – 218ECP546 (FULL VOLTAGE – EBM & EBP UNITS)

  • Page 54: Figure 4-17 Wiring Diagram - 215Eap546

    FIGURE 4–17 – WIRING DIAGRAM – 215EAP546 (WYE–DELTA – EAP UNITS ONLY)
  • Page 55 Air/oil under pressure will cause severe personal injury or death. Shut OIL SPECIFICATIONS (Domestic and International) – down compressor, relieve system of The factory fill compressor lubricant is Gardner Denver all pressure, disconnect, tag and AEON 9000 SP lubricating coolant which can be lockout power supply to the starter used for year–round operation.

  • Page 56: Figure 5-1 Flow Diagram

    221ECM797–A (Ref. Drawing) FIGURE 5–1 – FLOW DIAGRAM...

  • Page 57: Figure 5-2 Oil Flow Diagram - Remote Overhead Mounted

    201EAP797 (Ref. Drawing) 218ECM797 (Ref. Drawing) FIGURE 5–2 – OIL FLOW DIAGRAM – REMOTE OVERHEAD MOUNTED 13–9/10–641 SP Page 47...

  • Page 58: Figure 5-3 Cooler Drain Detail

    All materials used in Gardner Denver compressor units are compatible with AEON 9000 SP Lubricating Coolant. Use caution when selecting down- stream components such as air line lubricating bowls, gaskets and valve trim. AEON 9000 SP Synthetic Lubricant is not compatible with low nitrile Buna N or acrylic paints.
  • Page 59 age, the thermal mixing valve (H) remains on the pack- ADDITION OF OIL BETWEEN CHANGES must be age. Control group part number 200ECM4002 will be made when the oil level is in the red range on the gauge mounted on package at the factory. This group controls as read while the unit is on.

  • Page 60: Figure 5-4 Oil Level Gauge

    pleted when upgrading or changing the type of lubri- cant. Thoroughly drain system: – Drain oil from air end and cooler while hot. – Break low point connections and drain oil from pipe runs. – Dump oil from the filter and reinstall used fil- ter.

  • Page 61: Figure 5-6 Approximate Oil System Capacities

    Gardner Denver offers a free oil analysis program with the AEON lubricants and we recommend a sam- If the drained oil and/or the oil filter element are ple be sent in at 100 hours on a new unit.
  • Page 62 Add oil, if necessary, to bring level to the center of the green range on the gauge. On unloaded operation and after shutdown some oil will Air/oil under pressure will cause drain back into the oil reservoir and the oil level gauge severe personal injury or death.

  • Page 63: Figure 5-7 Thermostatic Mixing Valve Element

    It is mandatory that any water cooled unit be installed in a shelter heated to temperatures above freezing (32 F., 0 C). Oil cooler malfunction may be traced by checking pres- sure at oil inlet and outlet. At normal operating air ser- vice pressure (65 to 150 psig, 4.5 to 10.3 Bars) with the unit warm, a pressure drop of 3 to 15 psi (.2 to 1 Bar) can be expected between the oil inlet and the oil outlet.

  • Page 64: Figure 5-8 Water Control Valve

    To decrease water flow (increase compressor dis- charge air temperature) turn the adjusting screw from left to right, increasing spring tension. To increase wa- ter flow (decrease compressor discharge air tempera- ture) turn the adjusting screw in the opposite direction. The groove at the lower edge of the adjusting screw is an index line for use with the index scale 0 to 8 in obtain- ing a desired setting.

  • Page 65: Figure 5-10 Oil Separator

    separator housing to the compressor cylinder is not clogged or pinched off, the check valve in the oil return line is functioning properly, and there is not water or an oil/water emulsion in the oil. Oil carryover malfunctions of the oil separator are usu- ally due to using elements too long, heavy dirt or var- nish deposits caused by inadequate air filter service, use of improper oil or using oil too long for existing...
  • Page 66 Removal Of Oil Separator For Inspection Or Re- condition. Compressor should be at operating temper- placement: ature at the time of checks. One–half hour of loaded op- eration is usually sufficient to reach level–out operating temperatures. Air and Oil Discharge Temperature – 165 to 195 F (74 to 91 C) –...

  • Page 67: Section 6, Air Filter

    Never use elements that are damaged, ruptured or wet. Never use gaskets that won’t seal. Keep spare Use only genuine Gardner Denver air elements and gaskets on hand to re- filter elements on Gardner Denver duce downtime. Store elements in a compressor units.
  • Page 68 Pressure drop through a filter with a freshly tube when required by ramming a clean dry cloth cleaned element is below three (3) inches (76 through the tube. Wipe the inside of the filter body to mm) of water with the compressor running at full remove any dirt falling from the inlet tube before rein- load –...

  • Page 69: Section 7, Coupling

    SECTION 7 COUPLING (17 N–M) (37 N–M) (1.6 mm to 3.2 mm) FIGURE 7–1 – INSTALLATION OF COUPLING CUSHIONS Working through the coupling guard opening, cen- ter the coupling over the gap between the shafts, maintaining the gap as shown in FIGURE 7–1 be- tween the ends of the jaws on one coupling body Rotating machinery...

  • Page 70: Section 8, Maintenance Schedule

    SECTION 8 MAINTENANCE SCHEDULE SERVICE CHECK LIST – Air Filter – Operating conditions determine frequency Every 125 Hours Operation of service. If the “CHANGE AIR FILTER” message is Check for dirt accumulation on oil/aftercooler core displayed, air filter requires servicing or changing. See faces and the cooling fan.

  • Page 71: Section 9, Trouble Shooting

    SECTION 9 TROUBLE SHOOTING SYMPTOM POSSIBLE CAUSE REMEDY Compressor fails to start. 1. Wrong lead connections. 1. Change leads. 2. Blown fuses in control 2. Replace fuse. box. 3. Motor starter overload 3. Reset and investigate heaters tripped. cause of overload. 4.
  • Page 72 3. Ruptured oil separator 3. Replace element. element. 4. Loose assembly. 4. Tighten all fittings and gaskets. 5. Foam caused by use of 5. Use Gardner Denver incorrect oil. AEON 9000 SP Lubricating Coolant. 6. Inoperative minimum 6. Clean out or replace valve.
  • Page 73 9. Check oil reservoir tempera– ture and if low, change thermal mixing valve element to higher temperature. Gardner Denver factory remanufactured replacement compressor air end units are available from your authorized distributor, on an exchange basis, for all rotary screw compressor units. 13–9/10–641 SP...

  • Page 74: Section 10, Trouble Shooting Controls

    SECTION 10 TROUBLE SHOOTING CONTROLS AUTO SENTRY ES+ CONTROLLER DISPLAY MODES The normal display indicates the package service pressure, the airend discharge, the total running hours, and one of the following operating modes. The green light will be on for any operating mode, whether the compressor is run- ning or not.
  • Page 75 The compressor schematic area has red shutdown and yellow service advisory indicator lights. AIR FILTER yellow indicates that the filter needs to be changed DISCH THERM yellow indicates high temperature operation DISCH THERM red indicates a high temperature shutdown SEPARATOR yellow indicates the separator needs to be changed SEPARATOR red indicates a change separator shutdown...
  • Page 76 SHUTDOWN TROUBLESHOOTING GUIDE All shutdowns are indicated on the keypad by the word “SHUTDOWN” on the top line of the display, and one of the following messages on the lower line of the display. The red indicator in the Status area will be steadily lit while the conditions exist, and will flash after the condition has been corrected.
  • Page 77 SHUTDOWN TROUBLESHOOTING GUIDE (Continued) Message Action Needed HIGH DISCH TEMP This indicates that the controller has detected temperature in excess of the pro- grammed high temperature limit at the airend discharge. The most common cause for this is inadequate package cooling. Ensure proper air flow for air- cooled units, or adequate cooling water for water cooled units.
  • Page 78 SHUTDOWN TROUBLESHOOTING GUIDE (Continued) Message Action Needed MAIN STARTER The controller has attempted to start the compressor, but did not receive a re- turn signal from the starter’s auxiliary contact. If the starter does not pick up when attempting to start, check that connector 9 of the controller is plugged in firmly, and check the starter coil.
  • Page 79 CONTROLS TROUBLESHOOTING GUIDE The following are recommended service actions. Observe all instructions noted elsewhere in this manual. All electri- cal service is to be performed only by a qualified electrician. Symptom Recommended Action No display, Check incoming power to the compressor unit. Ensure that the disconnect is compressor stopped on and that fuses have not blown (or circuit beaker tripped).
  • Page 80 CONTROLS TROUBLESHOOTING GUIDE (Continued) Symptom Recommended Action Low reservoir pressure The ES+ controller will maintain a minimum pressure in the oil reservoir while in CONSTANT mode in CONSTANT or in other modes while the blowdown valve is closed. This or other modes before occurs only after initially loading the compressor unit.
  • Page 81 Company’s judgment is proved not to be as warranted. Gardner Denver Machinery Inc. (the “Company”) war- Labor shall be limited to the amount specified in the rants to each original retail purchaser (“Purchaser”) of Company’s labor rate schedule.

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