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Page Title: Refrigerant System
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TM  10-4130-239-14 1-9. EQUIPMENT DATA (CONT) Refrigerant System (cont) High pressure switch setting .   .286-304 psig (1,972-2,096 kN/M2) Low pressure switch setting . . . . . . . .   24 psig (165 kN/M2) Kits Support kit Gross weight . . . . . . . . . . . . . . . . . 47 lb (21 kg) Trailer mounting kit Gross weight . . . . . . . . . . . . . . . . . 69 lb (31 kg) See Appendix C located at end of manual for listing of contents of each   kit. Shippinq Container Length. . . . . . . . . . . . . . . . . . . . . 41 in (104 cm) Width. . . . . . . . . . . . . . . . . . . . . . .32 in(81 cm) Height. . . . . . . . . . . . . . . . . . . . . 44 in (112 cm) Approximate shipping weight. . . . . . . . . . . 679 lb (308 kg) Section  III. PRINCIPLES OF OPERATION 1-10. GENERAL OPERATION. The water chiller consists of three major components. A gasoline engine,   a refrigerant system, and a water system. a.    The gasoline engine powers the refrigerant compressor (B1) and water pump (P1). A centrifugal clutch on the engine drive shaft will allow the engine to start up and gain speed with a load or run even if the refrigerant compressor locks-up. To simplify starting the engine with the rope starter, a pneumatic timer switch (S8) is incorporated. This will allow pulling the rope without having to hold the starter switch (S3) at the same time. The engine speed is preset and governor controlled. b. The refrigerant system transfers heat absorbed in the evaporator (El) and discharges that heat to the condenser coil (Cl). Pressure switches (S1 and S2) prevent damage to components in the event of failures. c. Warm water flows into the water chiller through a hose. In the initial starting phase, water is by-passed around the thermostatic blending valve (V4) by the   “START-RUN” water control valve (V5). Once the engine is up to speed, the “START-RUN” valve is turned and water is run through the thermostatic valve. The valve will auto- matically either recirculate the water to reduce the temperature, or will open and allow more warm water into the system. Cool water will be available within three minutes of starting at the dispense nozzle. Water that is not dispensed will be returned to the water tank 1-6

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