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Heatcraft Refrigeration Products H-IM-72A, Инструкция по установке, эксплуатации и обслуживанию

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13

Table 5B.  Recommended Line Sizes for R-404A and R507 (continued)  *

         SUCTION LINE SIZE

  LIQUID LINE SIZE

     SUCTION TEMPERATURE

      Receiver to

-20˚F

             -30˚F

            -40˚F

 Expansion Valve

SYSTEM

Lengths

   Equivalent Lengths

    Equivalent  Lengths

Equivalent Lengths

CAPACITY

100'

150'

200'

25'

50'

75'

100'

150'

200'

25'

50'

75'

100'

150'

200'

25'

50'

75'

100' 150'

200'

BTU/H

1/2

1/2

1/2

3/8

3/8

1/2

1/2

1/2

5/8

3/8

1/2

1/2

1/2

5/8

5/8

3/8

3/8

3/8

3/8

3/8

3/8

1,000

5/8

7/8

7/8

1/2

1/2

5/8

5/8

7/8

7/8

1/2

1/2

5/8

5/8

7/8

7/8

3/8

3/8

3/8

3/8

3/8

3/8

3,000

7/8

7/8

7/8

5/8

5/8

5/8

7/8

7/8

7/8

1/2

5/8

5/8

7/8

7/8

7/8

3/8

3/8

3/8

3/8

3/8

3/8

4,000

7/8

7/8

7/8

5/8

5/8

7/8

7/8

7/8

7/8

5/8

5/8

7/8

7/8

7/8

1 1/8

3/8

3/8

3/8

3/8

3/8

3/8

6,000

7/8

1 1/8 1 1/8

5/8

7/8

7/8

7/8

1 1/8

1 1/8

5/8

7/8

7/8

7/8

1 1/8 1 1/8

3/8

3/8

3/8

3/8

3/8

3/8

9,000

1 1/8

1 1/8 1 1/8

7/8

7/8

7/8

1 1/8

1 1/8

1 1/8

7/8

7/8

7/8

1 1/8

1 1/8 1 1/8

3/8

3/8

3/8

3/8

3/8

1/2

12,000

1 1/8

1 1/8 1 3/8

7/8

7/8

1 1/8

1 1/8

1 1/8

1 3/8

7/8

7/8

1 1/8

1 1/8

1 1/8 1 3/8

3/8

3/8

3/8

3/8

1/2

1/2

15,000

1 1/8

1 3/8 1 3/8

7/8

1 1/8

1 1/8

1 1/8

1 3/8

1 3/8

7/8

1 1/8

1 1/8

1 1/8

1 3/8 1 3/8

3/8

3/8

3/8

1/2

1/2

1/2

18,000

1 3/8

1 3/8 1 3/8

1 1/8 1 1/8

1 1/8

1 3/8

1 3/8

1 3/8

1 1/8

1 1/8

1 1/8

1 3/8

1 3/8 1 3/8

3/8

3/8

1/2

1/2

1/2

1/2

24,000

1 3/8

1 3/8 1 5/8

1 1/8 1 1/8

1 3/8

1 3/8

1 3/8

1 5/8

1 1/8

1 1/8

1 3/8

1 3/8

1 3/8 1 5/8

3/8

1/2

1/2

1/2

1/2

1/2

30,000

1 3/8

1 3/8 1 5/8

1 1/8 1 3/8

1 3/8

1 3/8

1 3/8

1 5/8

1 1/8

1 3/8

1 3/8

1 3/8

1 5/8 1 5/8

1/2

1/2

1/2

1/2

1/2

5/8

36,000

1 5/8

1 5/8 1 5/8

1 1/8 1 3/8

1 3/8

1 3/8

1 5/8

1 5/8

1 1/8

1 3/8

1 3/8

1 3/8

1 5/8 1 5/8

1/2

1/2

1/2

1/2

5/8

5/8

42,000

1 5/8

1 5/8 1 5/8

1 1/8 1 3/8

1 3/8

1 3/8

1 5/8

1 5/8

1 1/8

1 3/8

1 3/8

1 3/8

1 5/8 1 5/8

1/2

1/2

1/2

5/8

5/8

5/8

48,000

1 5/8

1 5/8 1 5/8

1 3/8 1 3/8

1 3/8

1 5/8

1 5/8

2 1/8

1 3/8

1 3/8

1 3/8

1 5/8

1 5/8 2 1/8

1/2

1/2

1/2

5/8

5/8

5/8

54,000

1 5/8

1 5/8 2 1/8

1 3/8 1 3/8

1 5/8

1 5/8

1 5/8

2 1/8

1 3/8

1 3/8

1 5/8

1 5/8

1 5/8 2 1/8

1/2

1/2

5/8

5/8

5/8

5/8

60,000

1 5/8

1 5/8 2 1/8

1 3/8 1 5/8

1 5/8

1 5/8

1 5/8

2 1/8

1 3/8

1 5/8

1 5/8

1 5/8

1 5/8 2 1/8

1/2

1/2

5/8

5/8

5/8

5/8

66,000

1 5/8

1 5/8 2 1/8

1 3/8 1 5/8

1 5/8

1 5/8

1 5/8

2 1/8

1 3/8

1 5/8

1 5/8

1 5/8

1 5/8 2 1/8

1/2

5/8

5/8

5/8

5/8

5/8

72,000

1 5/8

2 1/8 2 1/8

1 5/8 1 5/8

1 5/8

1 5/8

2 1/8

2 1/8

1 5/8

1 5/8

1 5/8

1 5/8

2 1/8 2 1/8

5/8

5/8

5/8

5/8

5/8

7/8

78,000

2 1/8

2 1/8 2 1/8

1 5/8 1 5/8

1 5/8

2 1/8

2 1/8

2 1/8

1 5/8

1 5/8

1 5/8

2 1/8

2 1/8 2 1/8

5/8

5/8

5/8

5/8

7/8

7/8

84,000

2 1/8

2 1/8 2 5/8

1 5/8 2 1/8

2 1/8

2 1/8

2 1/8

2 5/8

1 5/8

1 5/8

2 1/8

2 1/8

2 1/8 2 5/8

5/8

5/8

5/8

7/8

7/8

7/8

90,000

2 1/8

2 5/8 2 5/8

1 5/8 2 1/8

2 1/8

2 1/8

2 5/8

2 5/8

1 5/8

2 1/8

2 1/8

2 1/8

2 5/8 2 5/8

5/8

5/8

7/8

7/8

7/8

7/8

120,000

2 5/8

2 5/8 2 5/8

2 1/8 2 1/8

2 1/8

2 5/8

2 5/8

2 5/8

2 1/8

2 1/8

2 5/8

2 5/8

2 5/8 2 5/8

5/8

7/8

7/8

7/8

7/8

1 1/8

150,000

2 5/8

2 5/8 3 1/8

2 1/8 2 1/8

2 5/8

2 5/8

2 5/8

3 1/8

2 1/8

2 1/8

2 5/8

2 5/8

2 5/8 3 1/8

7/8

7/8

7/8

7/8

1 1/8

1 1/8

180,000

2 5/8

3 1/8 3 1/8

2 1/8 2 5/8

2 5/8

2 5/8

3 1/8

3 1/8

2 1/8

2 5/8

2 5/8

2 5/8

3 1/8 3 1/8

7/8

7/8

7/8

1 1/8 1 1/8

1 1/8

210,000

2 5/8

3 1/8 3 1/8

2 5/8 2 5/8

2 5/8

3 1/8

3 1/8

3 5/8

2 5/8

2 5/8

2 5/8

3 1/8

3 1/8 3 5/8

7/8

7/8

1 1/8 1 1/8 1 1/8

1 3/8

240,000

3 1/8

3 5/8 3 5/8

2 5/8 2 5/8

3 1/8

3 1/8

3 5/8

4 1/8

2 5/8

2 5/8

3 1/8

3 5/8

3 5/8 4 1/8

7/8

1 1/8 1 1/8 1 1/8 1 3/8

1 3/8

300,000

3 5/8

3 5/8 4 1/8

2 5/8 3 1/8

3 1/8

3 5/8

3 5/8

4 1/8

2 5/8

3 1/8

3 5/8

3 5/8

4 1/8 4 1/8 1 1/8 1 1/8 1 1/8 1 3/8 1 3/8

1 5/8

360,000

3 5/8

3 5/8 4 1/8

3 1/8 3 5/8

3 5/8

4 1/8

4 1/8

4 1/8

3 1/8

3 5/8

3 5/8

4 1/8

4 1/8 4 1/8 1 1/8 1 1/8 1 3/8 1 3/8 1 5/8

1 5/8

480,000

3 5/8

3 5/8 4 1/8

3 1/8 3 5/8

3 5/8

4 1/8

4 1/8

5 1/8

3 1/8

3 5/8

3 5/8

4 1/8

4 1/8 5 1/8 1 1/8 1 3/8 1 3/8 1 5/8 1 5/8

1 5/8

600,000

5 1/8

5 1/8 5 1/8

4 1/8 5 1/8

5 1/8

5 1/8

5 1/8

6 1/8

4 1/8

 5 1/8

 5 1/8

 5 1/8

5 1/8  6 1/8 1 1/8  1 3/8 1 3/8  1 5/8 1 5/8

2 1/8

720,000

5 1/8

5 1/8 5 1/8

4 1/8 5 1/8

5 1/8

5 1/8

6 1/8

6 1/8

5 1/8

5 1/8

5 1/8

5 1/8

6 1/8 6 1/8 1 3/8 1 3/8 1 5/8 2 1/8 2 1/8

2 1/8

900,000

* NOTES:
1.

Sizes that are highlighted indicate maximum suction line sizes that should be used for risers.  Riser size should not exceed
horizontal size.  Properly placed suction traps must also be used for adequate oil return.
All sizes shown are for O.D. Type L copper tubing.

2.

Suction line sizes selected at pressure drop equivalent to 2˚F.  Reduce estimate of system capacity accordingly.

3.

Recommended liquid line size may increase with reverse cycle hot gas systems.

4.

If system load drops below 40% of design, consideration to installing double suction risers should be made.

Содержание H-IM-72A

Страница 1: ...465 6016 WWW HEATCRAFTRPD COM E MAIL HRPD FEEDBACK HEATCRAFT COM Parallel Parallel Parallel Parallel Parallel Compressor Compressor Compressor Compressor Compressor Systems Systems Systems Systems Systems Installation Installation Installation Installation Installation Installation Operation and Maintenance Guide Parallel Compressor Systems Replaces H IM 72A ...

Страница 2: ...fety Switch Table 12 Oil Charges Approved Copeland Lubricants Carlyle Compressors Approved Carlyle Lubricants Oil Pressure Table 13 O6D E Oil Pressure History 21 Table 14 Oil Safety Switch Table 15 Part Load Performance Mult Table 16 Required Differential Pressure Three Phase Voltage Monitor 22 Sight Glass Moisture Indicator Figure 10 Sight Glass Safety Relief Devices Figure 11 Direct Type Relief ...

Страница 3: ...rier of the damage immediately Request an immediate joint inspection with the carrier Do not repair the unit until inspected by carrier s representative Care should be exercised when uncrating units to prevent damage The system is shipped with a holding charge of dry nitrogen Check to see that pressure is still in the unit upon receipt Report lack of pressure immediately to the Heatcraft service d...

Страница 4: ... must be made for the parallel rack and all other equipment installed in the same area as the parallel units The location and installation of all equipment should be in accordance with all local and national code requirements While each unit is constructed with a welded steel base frame adequately designed to withstand vibration the natural pulsating action of the interconnected motor compressors ...

Страница 5: ...e structural beams to support the weight of the unit and service personnel The design of the beams supports must minimize deflection and attendant vibration transmission Due to the weights involved a structural analysis by a qualified engineer may be required before mounting Also for sound sensitive applications unit vibration isolators should be used UNIT VIBRATION ISOLATION Under certain critica...

Страница 6: ...nce be increased whenever possible Care should be taken to see that ample room is left for maintenance work through access doors and panels When the unit is in an area where it is enclosed by three walls the unit must be installed under the guidelines for unit installations in pits Decorative Fences Fences may be installed closer than the four foot 1 2 m lateral minimum except on the control panel...

Страница 7: ...rallel unit insure that all fuses and motor protective devices are in place and that all wiring is secure A complete wiring diagram for troubleshooting the unit will be found inside the control panel cover REFRIGERANT PIPING The system as supplied by Heatcraft was thoroughly cleaned and dehydrated at the factory Foreign matter may enter the system by way of the field piping required Therefore care...

Страница 8: ...eptable pressure drop at maximum load conditions The two lines normally are different in size with the larger line trapped as shown The smaller line must be sized to provide adequate velocities and acceptable pressure drop when the entire minimum load is carried in the smaller riser Figure 6 Double Suction Risers In operation at maximum load conditions gas and entrained oil will be flowing through...

Страница 9: ...y on hot gas lines to prevent line breakage This is critical on long straight runs of generally 70 or more where expansion loops must be provided and hangers should allow for longitudinal movement of the piping On a refrigeration system with gas defrost the refrigerant lines expand and contract with temperature changes The suction line normally has the greatest movement since it has the largest te...

Страница 10: ...rigerants In Liquid Line Risers Expressed in Pressure Drop PSIG and Subcooling Loss F Liquid Line Rise in Feet 10 15 20 25 30 40 50 75 100 Refrigerant PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F PSIG F R12 5 4 2 8 8 1 4 2 10 7 5 4 13 4 6 9 16 1 8 3 21 5 11 3 26 9 14 3 40 3 22 4 53 7 31 0 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 R502 4 9 1 5 7 ...

Страница 11: ... 26 39 63 86 1 24 12 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 502 404A 55 0 4 98 40 58 95 1 32 1 87 12 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 502 404A 78 0 7 07 56 82 1 35 1 86 2 64 12 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 502 404A 134 12 25 98 1 43 2 35 3 23 4 58 12 134a 244 9 78 52 99 1 5...

Страница 12: ... 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 1 3 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 1 5 8 2 1 8 1 5 8 1 5 8 1 5 8 84 000 1 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 1 5 8 1 5 8 1 5 8 90 000 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 2 5 8 1 5 8 1 5 8 2 1 8 120 000 1...

Страница 13: ...2 5 8 5 8 5 8 5 8 5 8 72 000 1 5 8 2 1 8 2 1 8 1 5 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 1 5 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 5 8 5 8 5 8 5 8 5 8 7 8 78 000 2 1 8 2 1 8 2 1 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 5 8 5 8 5 8 5 8 7 8 7 8 84 000 2 1 8 2 1 8 2 5 8 1 5 8 2 1 8 2 1 8 2 1 8 2 1 8 2 5 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 2 5 8 5 8 5 8 5 8 7 8 7 8 7 8 90 000 2 1 8 2 ...

Страница 14: ...1 3 8 1 3 8 1 3 8 1 5 8 1 5 8 1 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 1 3 8 1 3 8 1 5 8 84 000 1 1 8 1 1 8 1 3 8 1 3 8 1 3 8 1 5 8 1 1 8 1 3 8 1 3 8 1 3 8 1 5 8 1 5 8 1 3 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 1 3 8 1 5 8 1 5 8 90 000 1 1 8 1 3 8 1 3 8 1 3 8 1 5 8 1 5 8 1 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 120 000 1 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 1 3 8 ...

Страница 15: ... 8 5 8 5 8 72 000 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 1 2 1 2 5 8 5 8 5 8 7 8 78 000 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 1 3 8 1 5 8 2 1 8 2 1 8 2 1 8 2 1 8 1 2 5 8 5 8 5 8 5 8 7 8 84 000 2 1 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 1 3 8 1 5 8 2 1 8 2 1 8 2 1 8 2 1 8 1 2 5 8 5 8 5 8 7 8 7 8 90 000 2 1 8 2 1 8 2 1 8 1...

Страница 16: ...8 1 1 8 1 3 8 1 3 8 1 3 8 1 1 8 50 1 5 8 1 3 8 1 3 8 1 3 8 1 3 8 1 3 8 1 3 8 1 3 8 100 2 1 8 1 3 8 1 3 8 1 3 8 1 5 8 1 3 8 1 5 8 1 3 8 50 1 5 8 1 5 8 1 5 8 1 3 8 1 5 8 1 5 8 1 5 8 1 5 8 100 2 1 8 1 5 8 1 5 8 1 3 8 1 5 8 1 5 8 1 5 8 1 5 8 50 2 1 8 1 5 8 1 5 8 1 5 8 1 5 8 1 5 8 1 5 8 2 1 8 100 2 1 8 1 5 8 1 5 8 1 5 8 2 1 8 1 5 8 2 1 8 2 1 8 50 2 1 8 1 5 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 100 2 5 ...

Страница 17: ...agram for the unit will have to be consulted to determine how to best force the fans to operate for this step 4 With all compressor and control breakers and toggle switches turned off apply power to the unit If the unit is using a phase monitor the green light must come on before going any further See instructions for phase protector elsewhere in this manual A red light indicates incorrect phasing...

Страница 18: ...ld the Priority I design returns the liquid to the condenser through a liquid drain manifold Hot discharge gas is injected into the suction line at the parallel rack and flows to the evaporator being defrosted The discharge gas will condense into liquid as it flows through the cold evaporator The liquid exits the coil at the distributor side port then flows through the liquid line by pass check va...

Страница 19: ...ion of the oil and eventual failure of the bearings and piston rings In extreme cases the compressor will fail as a result of the diluted oil High suction superheat will result in excessive discharge temperatures that can cause a breakdown of the oil This action results in piston ring wear piston and cylinder wall damage Also as the superheat increases the suction pressure decreases resulting in r...

Страница 20: ...ose normally available to an electronic controller Usually the more steps available the better the load can be matched Copeland Compressors Table 8 3D 4D 6D Solid State Modules Control Voltage Model Copeland Copeland T I Number Kit Number Number Number 115 230 Volts 3D FSM 4D 6D 998 0524 00 071 0524 00 31AA 1600E Table 9 Typical Voltage Ranges Voltage 60 Hertz Rating 50 Hertz Rating Code Rating Mi...

Страница 21: ...0 ICI Emkarate RL68H Lubrizol Lubrikuhl 2916S Mobil Arctic EAL 68 Castrol SW68 Lubrizol ISO68 also sold under Texaco Capella HFC 68NA brand Medium temperature applications only POE Copeland Ultra 22CC Mobil EAL Arctic 22 CC ICI Emkarate RL32CF Thermal Zone 22CC Bitzer Screw Copeland Contour Screw compressor lubricant Solest 170 Oil Pressure The O6D and O6E oil pump is a positive displacement vane ...

Страница 22: ...ssor based voltage and phase sensing circuit constantly monitors the three phase voltages to detect harmful power line conditions When a harmful condition is detected the phase monitor output relay is deactivated after a specified trip delay The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time Restart Delay The trip delay prevents nu...

Страница 23: ...ve heat When a Vessel containing liquid refrigerant is shut off from other parts of the system a rise in temperature will cause a rise in pressure If the Vessel is completely filled with liquid a small rise in temperature will cause a rapid and excessive rise in pressure due to the expansion of the liquid If the Vessel contains both liquid and vapor which is normal for Refrigerant Receivers the pr...

Страница 24: ...SETTING RELIEF DEVICE CAPACITY SOFT COPPER TUBE O D SCHEDULE 40 PIPE LBS AIR MIN 3 8 1 2 5 8 1 2 3 4 1 1 1 4 1 1 2 2 10 3 1 2 19 1 4 61 108 445 12 2 1 2 12 1 4 44 75 308 14 2 9 1 2 32 56 228 18 5 1 4 19 1 4 33 137 20 4 1 4 16 28 110 371 25 2 1 2 9 1 2 18 72 238 30 2 7 12 49 165 35 2 5 1 4 9 37 121 40 3 1 2 7 28 93 366 50 2 1 2 4 18 60 233 70 3 9 30 119 257 80 2 7 23 91 198 90 2 5 18 72 156 125 3 1...

Страница 25: ...e drops to a predetermined level The latching mechanism inside the manual reset model is trip free The electrical contacts will cutout even if the reset button is held fully depressed The control can only be reset when the pressure returns to a predetermined level Liquid Level Switch S 9400 Level Switch Series OPTION Not available on all systems or receivers Figure 14 Table19 Level Switch Table CA...

Страница 26: ...l work properly Low Pressure Oil System This type system is normally used for parallel compressors and uses three basic components Oil Separator Oil Reservoir and Oil Level Regulators The common discharge is piped to the inlet of the oil separator and the outlet of the oil separator is piped to the condenser An oil return line is brought from the oil separator to the top valve of the oil reservoir...

Страница 27: ...t 20 psig higher than the highest suction pressure group This valve can be adjusted by removing the external cap and rotating the adjusting spring in or out as required The valve currently used is manufactured by Parker and is a model A7 constant pressure expansion valve with a range of 0 to 90 psig Temprite Part No is 67070000 An alternative valve manufactured by Sporlan is Model ADRI 11 4 0 90 T...

Страница 28: ...ss If the separator is not feeding on single or low pressure systems the sight glass will have little or no movement and normally will appear empty If the separator is feeding the sight glass will show a rush of oil and foam past the glass Most of the time viewing this sight glass can prevent having to open the system To check the oil level in the separator if the separator has a drain shut off th...

Страница 29: ...t compressor and make a complete electrical check 4 Make sure the suction line adjacent to the compressor is clean Install a liquid line filter drier or a replaceable cartridge designed for cleanup into the suction line shell 5 Install a burnout core in the liquid line shell 6 If the refrigerant is removed from the system follow the evacuation procedure found on page 17 of this manual 7 Start the ...

Страница 30: ...ntained at the desired pressure by supplying discharge gas to it through an adjustable outlet regulator Further power savings may be realized by directing only the hot gas to the top of the receiver to minimize the mixing of cold liquid and hot gas As a result subcooled liquid is fed to the evaporators resulting in increased refrigeration effect and efficiency Also the amount of hot gas that would...

Страница 31: ...bient should be near minimum system outdoor temperature to allow the system pressures to drop below the regulator pressure settings Before adjusting make sure that all manual opening stems on the regulators are set for automatic operation It may be necessary to temporarily deactivate the low pressure cut out controls to keep the compressors running during adjustment 6 The regulators should be pres...

Страница 32: ...stable from 0 to 80 psig with one complete turn equal to approximately 4 psi change Adjustments should be made in small increments allowing for the system to stabilize after each turn 6 Vary the evaporator load to test at various conditions that the suction pressure does not fall below the predetermined set point 7 Replace the seal cap on the adjusting stem Control Settings The following tables ar...

Страница 33: ...ontacts on compressor fan motor contactors Check appearance of control panel interior Check appearance of exterior conduit junction boxes Check appearance of insulation Check operation of auxiliary equipment Quarterly With unit in stable operation record all operating conditions Suction discharge liquid refrigerant pressure s and temperature s System superheat liquid subcooling ambient temperature...

Страница 34: ...ht replace stator 6 High discharge pressure 6 Eliminate cause of excessive pressure 7 Tight compressor 7 Check oil level Correct binding Unit operates 1 Control contacts sticking in closed position 1 Clean points or replace control long or 2 Insufficient refrigerant in system 2 Check for leaks Repair and add charge continuously 3 Dirty condenser 3 Clean condenser 4 Air or non condensables in syste...

Страница 35: ...w 6 Check means for regulating condensing temperature 7 Improper TXV 7 Check for proper sizing Little or No 1 Clogged suction oil strainer 1 Clean oil pressure 2 Excessive liquid in crankcase 2 Check crankcase heater Reset TXV for higher superheat Check liquid line solenoid valve for proper operation 3 Low oil pressure safety switch defective 3 Replace 4 Worn oil pump 4 Replace 5 Oil pump reversin...

Страница 36: ... Design SST Group __________________ Group __________________ Group _________________ Compressor Model Serial No __________________ __________________ Group __________________ Compressor Model Serial No __________________ __________________ Group __________________ Compressor Model Serial No __________________ __________________ Group __________________ Compressor Model Serial No _________________...

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