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9.  Recommended suction line pipe size

The following chart gives the suction pipe size recommendations for 440 and 550 compressors.

These recommendations must be strictly adhered to ensure adequate refrigerant and oil flow back 

to the compressor. An undersized suction line will cause a pressure drop between the evaporator 

outlet and the compressor, and create poor refrigerant and oil flow at the compressor. Particularly at 

high revs and low evaporator temperatures.

Unicla Suction Filter Insert 

Part no: 43701-000290 

Must be used in conjunction with 

Unicla Suction Mesh Screen, and 

must be removed after 2-12 hours 

from initial commissioning. This is 

ideal for removal of fine particles 

from a new system. 

Unicla Suction Mesh Screen

Part no: 43701-000270 

Can be left in place in the suction 

port to ensure continual removal 

of heavier particles in the system, 

however regular inspections of 

this mesh screen must take place 

to ensure a permanent blockage 

does not occur.

10.  Compressor speed

The following chart gives the Unicla 

speed recommendation for UWX440 

and UWX 550 compressors. This 

should be strictly followed at all times.

11.  In-line suction mesh screen and filter insert

The Unicla inline mesh screen and filter insert should be used whenever there is risk of debris and 

fine particles entering the compressor through the suction line.

In the case of older systems where the compressor is replacing a previous failure, the system must be 

flushed and the filter should be strictly monitored to ensure a blockage does not occur. More than 

one filter maybe required over several hours to properly clean the particles in the suction line.

   

Rated  Temp  Press 

Pipe Size

  Temp  Press 

Pipe Size

  Temp  Press 

Pipe Size

  Temp  Press 

Pipe Size

  Temp  Press 

Pipe Size

  RPM 

(kW) 

Diff 

Diff 

mm (inch)

  Diff  Diff 

mm (inch)

  Diff  Diff 

mm (inch)

  Diff  Diff 

mm (inch)

  Diff  Diff 

mm (inch

   

 

(K)  (kpa) 

 

(K)  (kpa) 

 

(K)  (kpa) 

 

(K)  (kpa) 

 

(K)  (kpa) 

 

 1000 

12.1 

0.55 

5.7 

22 (7/8)

  0.29 

28 (1 1/8)

  0.48 

28 (1 1/8)

  0.58 

28 (1 1/8)

  0.87  8.9 

28 (1 1/8)

 1500 

18 

029 

28 (1 1/8)

  0.58 

28 (1 1/8)

  0.98  10 

28 (1 1/8)

  0.41  4.2 

35 (1 3/8)

  0.61  6.3 

35 (1 3/8)

 2000 

18 

0.29 

28 (1 1/8)

  0.94  9.6 

28 (1 1/8)

  0.54  5.6 

35 (1 3/8)

  0.65  6.7 

35 (1 3/8)

  0.99  10.1 

35 (1 3/8)

 2500 

26.7 

0.64 

6.5 

28 (1 1/8)

  0.44  4.5 

35 (1 3/8)

  0.74  7.6 

35 (1 3/8)

  0.89  9.1 

35 (1 3/8)

  0.56  5.7 

41 (1 5/8)

Unicla 550 series

3m Pipe Length

6m Pipe Length

10m Pipe Length

12m Pipe Length

18m Pipe Length

Compressor

series

Ideal 

operation 

speed rpm

Maximum 

continuous 

rpm

Maximum 

momentary 

rpm

440/550

1200-2500

3000

4500

7.

Installation of mesh screen only

Installation of mesh screen and filter insert

Summary of Contents for UWX440

Page 1: ...UWX550 and UWX440 Installation Guidelines...

Page 2: ...ining professional information using representative graphs charts and tables Manufacturers specifications must be consulted for specific guidelines and performance data Unicla published data specific...

Page 3: ...and screen 7 12 Oil injector 8 13 Discharge line analysis pressure and temperature 8 14 Refrigerantcharging 9 15 Compressor operation analysis report 10 Note This booklet is designed to assist the ins...

Page 4: ...solid particle and chemical contamination before compressor fitting Solid particle contamination will cause direct compressor damage and starvation due to blocked system filters and screens see sectio...

Page 5: ...the bolt then pull out Fig A Fig B Fig C 3 Fitting of discharge hose manifold Install the gasket Install Manifold Valve this is right hand view M10 x L60 Bolt Tightening tension 34 3 Nm 355 kg cm Con...

Page 6: ...nd this amount is excluded from the quantities recommend above Note Oil quantity calculations are contained in the Unicla Service Handbook Total system oil requirement is based on 20 and 30 of refrige...

Page 7: ...rvation of the compressor Warranty is void if these guidelines are not followed Unicla Oil Type Alternative Unidap 6 POE 68 Unidap 7 PAG 46 Recommended alternatives for Unicla Lubricant 6 Oil type and...

Page 8: ...point Oil Green colouration exposure to copper oxidation Operation OK Recommendation Monitor oil condition and change if necessary Sight Glass Oil level low half point Oil Normal clean and transparen...

Page 9: ...e Unicla inline mesh screen and filter insert should be used whenever there is risk of debris and fine particles entering the compressor through the suction line In the case of older systems where the...

Page 10: ...ual is required or reference to additional technical information for specifications and faults regarding condensing to air differentials NR not recommended as a continuous running phase superheat may...

Page 11: ...peration b If it is not possible to access the system at the evaporator or roof level then service points in suction and discharge lines away from the compressor are the next best option c If refriger...

Page 12: ...ut oC Discharge Temp oC Pressure Drop Temp Difference oC Liquid Line Temp oC Suct LineTemp at Comp oC Discharge Superheat oC Evap Temp oC Condensor m s Subcooling oC Suct LineTemp at Evap oC Evap Duct...

Page 13: ...Notes...

Page 14: ...Unicla International Limited Unit 1209 1210 12F Manhattan Centre 8 Kwai Cheong Rd Kwai Chung N T Hong Kong Phone 852 2422 0180 Fax 852 2422 0680 Email sales unicla hk Website www unicla hk...

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