1-4 Refrigeration System Specifications
CSR-20 & CSR-40, September 1999
Refrigeration System
*DO NOT use or add standard synthetic or mineral oils to the refrigeration system. If Ester based oil becomes contaminated with
moisture or with standard oils, dispose of properly — DO NOT USE!
Compressor Model No.:
CSR-20SL, CSR-40 & CSR-40SL ZM18K4E-TFD-279, Hermetic Scroll
Refrigerant Charge:
CSR-20SL, CSR-40 & CSR-40SL 4.1 Kg (9.0 lb) R-404A
Water-Cooled Condenser-Receiver Tank (Option) 5.0 Kg (11.0 lb) R-404A
Compressor Oil Capacity 1.77 liter (60 oz.)
Compressor Oil Type Polyol Ester Based Type (required), TK Part No. 203-433*
High Pressure Cutout Switch: Cutout 3243 +/- 48 kPa, 32.43 +/- 0.48 bar, 470 +/- 7 psig
Cutin 2588 +/- 262 kPa, 25.88 +/- 2.62 bar, 375 +/- 38 psig
Water Pressure Switch (Option): Open 117 +/- 21 kPa, 1.17 +/- 0.20 bar, 17 +/- 3 psig
Close 35 +/- 21 kPa, 0.35 +/- 0.20 bar, 5 +/- 3 psig
High Pressure Relief Valve: Relief Pressure 3447 +520/-104 kPa, 34.47 +5.20/-1.04 bar, 500 +75/-15 psig
Reset 2758 kPa, 27.58 bar, 400 psig
Liquid Injection Control: Compressor Start Liquid injection valve opens for 5 minutes on each compressor start
Power Limit or Modulation Cool Liquid injection valve opens continuously during Power Limit and
Modulation Cool modes
Compressor Discharge Temperature Control Energizes (Opens) Liquid Injection Valve at 138 C (280 F)
De-energizes (Closes) Liquid Injection Valve at 132 C (270 F)
Compressor Shutdown (Auto Reset) at 148 C (298 F)
Liquid Injection Valve (Compressor): Voltage 24 Vac
Cold Resistance 5.6 ohms
Warm Gas Bypass Solenoid Valve: Voltage 24 Vac
Cold Resistance 5.6 ohms
Modulation Valve: Voltage 12 Vdc
Current Draw 0 to 0.4 amperes, valve open
0.4 to 1.4 amperes, valve modulates to close
Above 1.4 amperes, valve closed
Resistance 7.6 ohms at 24 C (75 F) ambient
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