valutazioni - 5, GPA: 4 ( )

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Incorrect inlet connection will result in poor system performance due to incorrect subcooling. The LIQUID-IN and LIQUID-OUT labels indicate water connections AS SUPPLIED FROM THE FACTORY. It is recommended that strainer with a minimum of 20 mesh be installed ahead of the condenser water inlet(s) to prevent debris from clogging or damaging the heat exchanger(s). There is a pressure-relief device on the condenser(s) of all 30HK, HWC, and HWS units. Most local codes require that this relief be vented directly to the outdoors. NOTE: The relief line must not be smaller than the relief valve outlet. Be sure to provide a way of draining and servicing the unit. 13 LEGEND Airflow Through Condenser Airflow Through AirHandling UnitPower WiringControl Wiring Chilled Water Piping ST — Field-Supplied StarterFD — Field-Supplied DisconnectFS — Field-Supplied Differential Flow Switch *Field Supplied. NOTES: Chiller must be installed 1. levelly to maintain proper compressor oil return. Wiring and piping shown are general points-of-connection guides only and are not intended for a specific installation. Wiring and piping2. shown are for a quick overview of system and are not in accordance with recognized standards. All wiring must comply with applicable local and national codes. 3. All piping must follow standard piping techniques. Refer to Carrier System Design Manual or appropriate ASHRAE (American Society4. of Heating, Refrigeration, and Air Conditioning Engineers) handbook for details. See Table 3 on page 17 for minimum systemfluid volume. This system may require the addition of a holding tank to ensure adequate5. volume. Fig. 13 — Typical Piping with Fluid-Cooled 30HWB Unit Shown NOTES: 1. Chiller must be installed levellyto maintain proper compressor oil return. 2. Wiring and piping shown are general points-of-connection guides only and are not intended for a specific installation. Wiring and piping shown are for a quick overview of system and are not in accordance with recognized standards. 3. All wiring must comply with applicable local and national codes. 4. All piping must follow standard piping techniques. Refer to Carrier System Design Manual part 3, Carrier E20-II. software Refrigerant Piping program, or appropriate ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) handbook for details on proper piping sizes and design. 5. See Table 3 on page 17 for minimum system fluid volume. This system may require the addition of a holding tank to ensure adequate volume. 6. Hot gas lines should rise above refrigerant level in condenser circuit. Double riser may be required; check compressor minimum capacity. 7. Trap should be installed on hot gas lines to prevent condenser oil and refrigerant vapor migration from accumulating on compressor heads during off cycle. 8. Pitch all horizontal lines downward in the direction of refrigerant flow. 9. For piping lengths greater than 50 ft, provide support to liquid and gas lines near the connections to the condenser coil. 10. For pressure relief requirements, see latest revision of ASHRAE Standard 15, Safety Code for Mechanical Refrigeration. Fig. 14 — Typical Piping with Air-Cooled 30HWA with Remote 09DK Unit Shown 15 30HWB CONDENSER — When facing the back of the unit, the condenser is the uninsulated heat exchanger located on the right-hand side. The water connections are on the right- hand side of the heat exchanger with the LIQUID-IN connection at the bottom, and the LIQUID-OUT connection at the top. A strainer with a minimum of 20 mesh must be installed ahead of the condenser water inlet to prevent debris from clogging or damaging the heat exchanger. To install the grooved end coupling (see Fig. 15): 1. Lubricate the gasket lips and stretch the gasket over the end of the pipe. Avoid twisting the gasket when installing. 2. Bring the pipe and heat exchanger coupling ends together into alignment. Slide the gasket so that it is centered over the ends. Apply a light film of lubricant to the gasket, or to the gasket recess of the coupling housing. Avoid twisting the gasket during installation. 3. Seat the coupling halves over the gasket and install the nuts and bolts. Tighten the nuts equally on both sides. 4. Alternately tighten the nuts with a wrench to draw the coupling halves together uniformly. The joint is now complete. 30HK, HWB, HWC, HWS UNITS — In order to minimize the water pressure drop in the system, use as few bends as possible in the field water piping, and run the lines as short as possible. Size the water lines according to the available pump pressure (not necessarily the connection size), especially on cooling tower applications. See Carrier System Design Manual, Part 3, Piping Design. See Fig. 16 for condenser pressure drops. Set water regulating valve to maintain design head pressure. Do not adjust to compensate for high head pressures caused by fouled condenser tubes, excess refrigerant, or the presence of noncondensables. Due to cha...

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