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SWS 2652 HFС 134a
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Airwell SWS 2652 HFС 134a [28/82] English

Airwell SWS 2652 HFС 134a [28/82] English

Page 27

English

General Description

7.4 Refrigerant circuits

Every single SWS unit has two complete refrigerant

circuits, one per compressor. Each refrigerant circuit

includes: a service valve for refrigerant filling, shutoff

valves for suction lines (on request), as well as for the

delivery and liquid lines, a thermostatic expansion

valve with external equalizer, a solenoid valve to

start/stop the compressor, a dehydrating cartridge

filter, a sight glass with humidity indicator, a differen-

tial oil pressure switch. The moto-evaporating SWR

units, which derive from the SWS versions, are

marked by the absence of condensers, are provided

with shutoff cocks on the delivery and liquid lines, so

as to allow the connection of remote condensers.

Each circuit is also provided with safety devices, in

accordance with PED 97/23/EC: HP pressure

switches, pressure transducers, safety valves provid-

ing protection in case of fire or in the case of a mal-

function of compressors.

7.5 Evaporator

All units are equipped with a single direct-expansion

refrigerant/water exchanger of shell and tube type,

with several refrigeration circuits. The tube bundle

can be removed for any inspections or maintenance.

The heat exchangers are insulated with 19mm-thick

anti-condensate closed-cell polyethylene material.

The insulating material is not UV-ray-proof.

7.6 Condenser

All units are provided with two condensers (one per

circuit). The heat exchanger is of shell and tube type,

with square plates, preset for opening for inspection,

cleaning and maintenance purposes.

SWS refrigeration diagram

9 Sight glass

10 Thermostatic valve

11 Evaporator

12 Safety valve

13 Suction cock (optional)

14 Nonreturn valve (optional)

15 Solenoid valve (optional)

16 Capillary (optional)

Components:

1 Screw compressor

2 Screw compressor’s

delivery cock

3 Flexible hose - absorber

(ELN version only)

4 Silencer (ELN version only)

5 Condenser

6 Safety valve

7 Liquid cock

8 Filter

Safety devices:

A HP pressure switch

B LP pressure switch

C Transducer

D Differential water pressure switch

Filling/discharge and

pressure/intakes Freon

Note: the units are equipped with two re-

frigeration circuits. Only one circuit is

illustrated for the sake of simplicity.

Manuale SWS-SWR EN1.qxp 05/11/06 14:18 Pagina 27

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