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15

Preventive Maintenance

Air Cooled Condensing Units

Quarterly

1) Visually inspect unit 
  •  Look for signs of oil stains on interconnection piping and  

    condenser coil. Pay close attention to areas around solder  

    joints, building penetrations and pipe clamps. Check any  

    suspect areas with an electronic leak detector. Repair any  

    leaks found and add refrigerant as needed.  
  •  Check condition of moisture indicator/sightglass in the  

    sight glass if so equipped. Replace liquid line drier if there  

    is indication of slight presence of moisture. Replace  

    refrigerant, oil and drier if moisture concentration is  

    indicated to be high. 
  •  Check moisture indicator/sightglass for flash gas. If found  

    check entire system for refrigerant leaks and add refrigerant 

    as needed after repairing any leaks. 
  • 

Check compressor sightglass (if equipped) for proper oil level. 

  •  Check condition of condenser. Look for accumulation of dirt  

    and debris (clean as required). 
  •  Check for unusual noise or vibration. Take corrective action 

    as required. 
  •  Inspect wiring for signs of wear or discoloration and repair  

     if needed. 
  •  Check and tighten all flare connections.

 

Semi-Annually

2) Repeat all quarterly inspection items. 

 

3) Clean condenser coil and blades 
  •  Periodic cleaning can be accomplished by using a brush,  

    pressurized water and a commercially available foam coil  

    cleaner. If foam cleaner is used, it should not be an acid  

    based cleaner. Follow label directions for appropriate use. 
  • Rinse until no residue remains.
4) Check operation of condenser fans 
  •  Check that each fan rotates freely and quietly. Replace any  

    fan motor that does not rotate smoothly or makes excessive 

    noise. 
  •  Check all fan blade set screws and tighten as required. 
  •  Check all fan blades for signs of cracks, wear or stress. 

    Pay close attention to the hub and spider. Replace blades  

    as required. 
  •  Verify that all motors are mounted securely. 
  •  Lubricate motors if applicable. Do not lubricate permanently  

    sealed, ball bearing motors.
5) Inspect electrical wiring and components 
  •  Verify that all electrical and ground connections are secure, 

    tighten as required. 

  •  Check condition of compressor and heater contactors. Look  

    for discoloration and pitting. Replace as required. 
  •  Check operation and calibration of all timers, relays  

 

    pressure controls and safety controls.

  •  Clean electrical cabinet. Look for signs of moisture, dirt,  

    debris, insects and wildlife. Take corrective action as  

    required. 
  •  Verify operation of crankcase heater by measuring amp  

    draw. 
6)  Check refrigeration cycle 

 

  •  Check suction, discharge and net oil pressure readings. If  

    abnormal take appropriate action. 
  •  Check operation of demand cooling, liquid injection or 

    unloaders if so equipped. 
  •  Check pressure drop across all filters and driers. Replace  

    as required. 
  •  Verify that superheat at the compressor conforms to  

    specification. (30°F to 45°F) 
  •  Check pressure and safety control settings and verify  

    proper operation.

Annually

7) In addition to quarterly and semiannual maintenance checks,  

  submit an oil sample for analysis 

 

  •  Look for high concentrations of acid or moisture. Change oil  

    and driers until test results read normal. 
  •  Investigate source of high metal concentrations, which 

    normally are due to abnormal bearing wear. Look for liquid  

    refrigerant in the crankcase, low oil pressure or low super- 

    heat as a possible source.

Replacement Parts

Whenever possible, replacement parts are to be obtained 

from a local wholesaler authorized to sell one of Heatcraft 

Refrigeration Productsʼ  brands. Replacement parts which 

are covered under the terms of the warranty statement 

on page 2 of this manual, will be reimbursed for total part 

cost only. The original invoice from the parts supplier 

must accompany all warranty claims for replacement part 

reimbursement. Heatcraft Refrigeration Products reserves 

the right to adjust the compensation amount paid on any 

parts submitted for warranty reimbursement when a parts 

supplierʼ s original invoice is not provided with a claim. 

You may obtain information regarding local authorized 

wholesalers by calling the Heatcraft Refrigeration Products 

Replacement Parts Center at 1-800-686-7278 between the 

hours of 7:30 AM to 4:30 PM Central Time.

Summary of Contents for H-IM-FL1A

Page 1: ...riers Sight Glasses 5 Refrigerant Oils 6 Phase Loss Monitor 7 Recommended Refrigerant Piping Practices 7 Refrigeration Pipe Supports 7 Suction Lines 8 Suction Line Risers 8 Liquid Lines 8 Evacuation and Leak Detection 11 Refrigerant Charging Instructions 12 Field Wiring 12 Check Out and Start Up 12 Operational Check Out 13 System Balancing Compressor Superheat 13 System Troubleshooting Guide 14 Pr...

Page 2: ...turerʼs recommendations or if the serial number has been altered defaced or removed MOTOR COMPRESSORS Motor compressors furnished by SELLER are subject to the standard warranty terms set forth above except that motor compressor replacements or exchanges shall be made through the nearest authorized wholesaler of the motor compressor manufacturer not at SELLERʼs factory and no freight shall be allow...

Page 3: ...d Location Requirements for Air Cooled Condensing Units and Remote Condensers Units in Pits The top of the unit should be level with the top of the pit and side distance increased to 2W If the top of the unit is not level with the top of pit discharge cones or stacks must be used to raise discharge air to the top of the pit This is a minimum requirement Decorative Fences Fences must have 50 free a...

Page 4: ...ess Provide adequate space at the compressor end of the unit for servicing Provide adequate space on the connection side to permit service of components Spring Mounted Compressor Compressors are secured rigidly to make sure there is no transit damage Before operating the unit it is necessary to follow these steps a Remove the upper nuts and washers b Discard the shipping spacers c Install the neop...

Page 5: ... drier The sight glass is designed to give a visual indication of moisture content in the system Generally it requires no field service However in cases of extreme acid formation in a system after a compressor burnout the acid may damage the sensing element or etch the glass This would require that the sight glass be replaced along with the liquid line drier after any compressor motor burnout CAUTI...

Page 6: ...introduction of the Polyol ester lubricants Table 3 below summarizes which oils lubricants are approved for use in Copeland compressors Polyol Ester Lubricants Hygroscopicity Ester lubricants POE have the characteristic of quickly absorbing moisture from the ambient surroundings This is shown graphically in Figure 3 where it can be seen that such lubricants absorb moisture faster and in greater qu...

Page 7: ... the base of each suction riser of four 4 feet or more to enhance oil return to the compressor e For desired method of superheat measurement a pressure tap should be installed in each evaporator suction line in the proximity of the expansion valve bulb f When brazing refrigerant lines an inert gas should be passed through the line at low pressure to prevent scaling and oxidation inside the tubing ...

Page 8: ...superheat at the compressor Figure 6 Suction P Traps Slope 1 4 per 10 ft toward compressor Suction Lines NOTE If the suction line must rise to a point higher than the suction connection on the evaporator a suction line trap at the outlet of the evaporator must be provided Horizontal suction lines should slope away from the evaporator toward the compressor at the rate of 1 4 inch per 10 feet for go...

Page 9: ...Tee Straight Through 1 2 2 3 4 4 5 7 8 10 12 14 16 Table 4 Pressure Loss of Liquid Refrigerants in Liquid Line Risers Expressed in Pressure Drop PSIG and Subcooling Loss F Liquid Line Rise in Feet 10ʼ 15ʼ 20ʼ 25ʼ 30ʼ 40ʼ 50ʼ 75ʼ 100ʼ Refrigerant PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F R22 4 8 1 6 7 3 2 3 9 7 3 1 12 1 3 8 14 5 4 7 19 4 6 2 24 2 8 0 36 3 12 1 48 4 16 5 R134a 4...

Page 10: ... 1 3 27 26 39 63 86 1 24 134a 64 2 2 57 14 26 40 61 1 91 1 3 8 22 63 5 3 50 27 42 64 93 1 33 R507 404A 55 0 4 98 40 58 95 1 32 1 87 134a 90 9 3 65 20 37 57 87 1 30 1 5 8 22 90 0 4 96 37 59 90 1 33 1 88 R507 404A 78 0 7 07 56 82 1 35 1 86 2 64 134a 158 6 34 34 64 98 1 51 2 24 2 1 8 22 156 8 61 65 1 03 1 57 2 30 3 26 R507 404A 134 12 25 98 1 43 2 35 3 23 4 58 134a 244 9 78 52 99 1 51 2 32 3 47 2 5 8...

Page 11: ...CFCʼs There is a view that even small quantities of chlorine may act as a catalyst encouraging copper plating and or corrosion and should therefore be avoided WARNING HFC 134a has been shown to be combus tible at pressure as low as 5 5 psig at 350 F when mixed with air at concen trations more than 60 air by volume At lower temperature higher pressures are required to support combustion Therefore a...

Page 12: ...ng until system has sufficient refrigerant for proper operation Do not overcharge Remember that bubbles in a sight glass may be caused by a restriction as well as a shortage of refrigerant i Do not leave unit unattended until the system has reached normal operating conditions and the oil charge has been properly adjusted to maintain the oil level at the center of the sight glass CAUTION Extreme car...

Page 13: ...ve at the evaporator should be adjusted Operational Check Out After the system has been charged and has operated for at least two hours at normal operating conditions without any indication of malfunction it should be allowed to operate overnight on automatic controls Then a thorough recheck of the entire system operation should be made as follows a Check compressor discharge and suction pressures...

Page 14: ... system 3 Check for leaks Repair and add charge 4 Low suction pressure 4 See corrective steps for low suction pressure 5 Variable head pressure valve 5 Check valve setting High suction pressure 1 Excessive load 1 Reduce load or add additional equipment 2 Expansion valve overfeeding 2 Check remote bulb Regulate superheat Low suction pressure 1 Lack of refrigerant 1 Check for leaks Repair and add ch...

Page 15: ... and components Verify that all electrical and ground connections are secure tighten as required Check condition of compressor and heater contactors Look for discoloration and pitting Replace as required Check operation and calibration of all timers relays pressure controls and safety controls Clean electrical cabinet Look for signs of moisture dirt debris insects and wildlife Take corrective acti...

Page 16: ...ATE MODULE R1 R4 RELAYS TD7 8 START TIMER FIELD WIRING FACTORY WIRING CB1 CB7 CIRCUIT BREAKERS F1 FUSE CLASS CC CCH CRANKCASE HEATERS C1 C4 COMPRESSOR CONTACTORS C1A1 C4A1 C1 C4 AUXILIARY CONTACTS C5 C12 CONDENSER FAN CONTACTORS FCT FAN CYCLE TEMP CONTROL LSV LIQUID LINE SOLENOID VALVE HPS HIGH PRESSURE SWITCH LPS LOW PRESSURE SWITCH LEGEND w 30 MIN TIME DELAY 25 A M1 M3 C5 25 A C6 25 A M5 M7 C7 2...

Page 17: ...TE MODULE R1 R4 RELAYS TD7 8 START TIMER FIELD WIRING FACTORY WIRING CB1 CB7 CIRCUIT BREAKERS F1 FUSE CLASS CC CCH CRANKCASE HEATERS C1 C4 COMPRESSOR CONTACTORS C1A1 C4A1 C1 C4 AUXILIARY CONTACTS C5 C12 CONDENSER FAN CONTACTORS FCT FAN CYCLE TEMP CONTROL LSV LIQUID LINE SOLENOID VALVE HPS HIGH PRESSURE SWITCH LPS LOW PRESSURE SWITCH LEGEND w 30 MIN TIME DELAY 25 A M1 M3 C5 25 A C6 25 A M5 M7 C7 25...

Page 18: ...18 Control Circuit Wiring Diagram for BACU51 and BACU59 ...

Page 19: ...19 Submittal ...

Page 20: ...20 Submittal ...

Page 21: ...t Serial ________________________________________ Compressor Model ____________________ Compressor Model _________________ Compressor Serial ____________________ Compressor Serial __________________ Electrical _________________ Volts __________________ Phase _______ Voltage at Compressor L1__________ L2 ___________ L3 ___________ Amperage at Compressor L1__________ L2 ___________ L3 ___________ Se...

Page 22: ...22 Notes ...

Page 23: ...23 Notes ...

Page 24: ...PLACE BOULEVARD STONE MOUNTAIN GA 30087 USA 770 465 5600 FAX 770 465 5990 WWW HEATCRAFTRPD COM Since product improvement is a continuing effort we reserve the right to make changes in specifications without notice Visit us online at www heatcraftrpd com ...

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