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SINGLE COMPRESSOR CENTRIFUGAL CHILLERS

PEH/PHH 050,063,079,087,100,126

13600 Industrial Park Blvd.. P.O. Box 1551, Minneapolis, MN 55440

Содержание PEH050

Страница 1: ...SINGLE COMPRESSOR CENTRIFUGAL CHILLERS PEH PHH 050 063 079 087 100 126 13600 Industrial Park Blvd P O Box 1551 Minneapolis MN 55440...

Страница 2: ...L E S H O O T I N G G U I D E 20 22 McQUAY CENTRIFUGAL OPERATING LOG 23 M c Q U A Y S E R V I C E P R O G R A M S 24 17 18 18 18 18 18 18 19 19 INTRODUCTION GENERAL DESCRIPTION The McQuay Model PEH Ce...

Страница 3: ...l startup of the chiller he will be available to answer any ques tions and to instruct in proper operating procedures It is recommended that the operator maintain an operating log for each individual...

Страница 4: ...erating circuit When this switch is turned on its self contained light will energize and the control circuit is ready for automatic operation of the compressor The Load Recycling Thermostat LRT sensin...

Страница 5: ...ion after Box time delay 1lO F Auto Temp Oil Assures minimum compressor casting temperature at startup Section Temp CE126 compressor only Liquid Injection Solenoid LIS None None Refrig Piping None Ope...

Страница 6: ...T 104 F Auto Control Box None On units with refrigerant cooled oil cooler controls oil sump heater to maintain set temperature Sequence Relay SR None None Field Suoolied None Relay controlled by syste...

Страница 7: ...eveloped by McQuay Guardistor Motor Protection Positive protection against motor overheating is provided by the Guardistor system The heart of the Guardistor protective circuit are the thermistors emb...

Страница 8: ...FF Switch with light 26 Gauges 1 Operating Relays R1 R10 2 Surgegard Relay 3 Guardistor Relay 4 Oil Pump Time Delay Switch 5 Anti Recycle Time Delay Relay 6 Prelube Timer 7 Oil Pump Safety Timer 8 Sys...

Страница 9: ...e module will function as follows Red will light during unloading control action green will light during loading and amber will light when the load action is overridden by the current limit control Re...

Страница 10: ...held in that position Refer to Figure 7 for solenoid action Note that both solenoids cannot be energized simultaneously METERING VALVES The speed at which the capacity control vanes are opened or clos...

Страница 11: ...l pump for the CEO50 compressor is completely self contained within the compressor housing The assembly in cludes the pump pump motor oil heater and oil separator The oil is pumped through the oil dis...

Страница 12: ...erant flow and keeps the machine from short cycling under light load con ditions It also prevents surge during heat recovery operation OPERATING THE CHILLER The initial startup of the McQuay centrifug...

Страница 13: ...temperature Normally the compressor will load to full load according to the settings of the control module ramp up control OPERATING CHECKS 1 While operating under automatic control the operator shoul...

Страница 14: ...compressor cannot be restarted unless the switch is repositioned If the operator has the need to secure the chiller and pro hibit starting by unauthorized personnel removal of relay R7 from its plug i...

Страница 15: ...ation of the expansion valves Proper superheat set ting is 2 to 6 F at full load ELECTRICAL SYSTEM Maintenance of the electrical system involves the general re quirement of keeping contacts clean and...

Страница 16: ...ush out condenser and check for leaks Refer to the procedures of Preliminary Checks Before Starting before energizing the compressor circuit REPAIR OF SYSTEM PUMPING DOWN If it becomes necessary to pu...

Страница 17: ...prevent localized freezing Consult the chiller nameplate for the proper refrigerant charge With a near normal charge in the system final charging can best be accomplished with the unit running with th...

Страница 18: ...the actual chilled water temperature This signal is calibrated at the factory or by the McQuay Service technician performing the initial startup of the chiller This signal normally is adjusted to appr...

Страница 19: ...ential Since the LRT scale is not highly accurate a practical set ting can be made with the machine running Turn the dial clockwise to a higher temperature until the compressor stops At this point com...

Страница 20: ...cts 3 Oil pump 4 Relay action 5 Relay action 6 Valve positron 7 Oil pressure drop 8 Feed oil lines for temperature 9a Pump b Relief valve c Filter d Bearings and seals 10 Opening closing pressure 1 Ch...

Страница 21: ...OAD RECYCLE 1 Normal shutdown 2 Load recycle thermostat 3 Anti recycle thermostat 1 Chilled water temperature satisfied 2a Setting drift b Loss of bulb charge 3a Time delay not yet timed o 4 Low sourc...

Страница 22: ...rate 3 Observe suction pressure 4 Evaporator pressure drop 5 Superheat subcooling 6 Measure temperature 1 a Check 20 6 2 VD b Check load action 2 Remove one sensor lead 3 Jumper COM ISA 4 Verify conn...

Страница 23: ...DESIGN CONDITIONS LOG SHEET JOB NO CHILLER NO Compressor F L A Condenser Pump F L A Chiller Pump F L A CHILLER GPM PRESS DROP LVG TEMP ENT TEMP REFRIG TEMP CONDENSER GPM PRESS DROP LVG TEMP ENT TEMP R...

Страница 24: ...y of maintenance services through its Nationwide Service Organization and can tailor these services to suit the needs of the building owner Most popular among these services is the McQuay Com prehensi...