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Resumen del manual
. with capacities in the 15-ton range. is> Carrier Corporation 1 977 Form 50DQ-6P Reliability and efficiency in commercial and industri Energy and operating expense. They get first consideration these days. Especially in plans for heating and cooling systems for commercial, industrial, or educational buildings. Heat pumps — especially Carrier heat pumps — look good on both points. They are electric — so energy supply is available. They also make very efficient use of power — particularly in heating, where it counts most. And they are reliable, so operating expense is kept to a minimum. The Carrier Model 50DQ016 offers 15 nominal tons of cooling . . . with airflows up to 6300 cfm. It is completely self-contained in a weather-resistant steel cabinet, piped, wired, charged and tested at the factory. It can be mounted outdoors on a slab, or on the roof, using a factory-designed rooftop adapter and roof curb. Installation is simplified to save time and money. You can count on consistent performance from a heating and cooling system planned around the Carrier Model 50DQ016 heat pump. It can be applied in almost any climate for year-round operation. Carrier engineered this heat pump to include built-in safeguards that keep downtime and interruptions to a minimum. © A time-tested, high-efficiency compressor — The Model 06D. Semihermetic type. Rugged cast- iron housing. It has been in use in heat pumps for more than 20 years, and has a remarkable record for durability and efficiency. It’s fully protected against overcurrent and overtemperature conditions, and has crankcase heaters to prevent dilution of oil by refrigerant when the unit is shut down. s Loss of charge protection — An internal thermostat in the discharge line prevents damage to the system. A pressurestat in the liquid line also provides freeze-up protection. Time Guard® circuit — Compressor cannot restart for at least five minutes after stopping for any reason. This prevents compressor short cycling. O Suction line accumulator — Protects compressor against slugging during low temperature operation and defrost cycle. © Automatic defrost system — Keeps coil frost-free at temperatures below 45 F. An air pressure switch senses frost build-up on coil and activates defrost system every 45 minutes if required. o Emergency heat control —Energizes auxiliary electric heat if compressor becomes inoperative. Can be manually set to energize electric heaters and lock out the compressor. Requires use of thermostat with emergency heat switch and indicator light. ] — Discharge Shutoff Valve 2 — Capacity Control Valve Location 3 — Terminal Box Location 4 — Discharge Valve Assembly 5 — Suction Shutoff Valve 6 — Polished Crankshaft 7 — Vane-Type Oil Pump 8 — Oil Reservoir Showing Screen and Intake Line 9 — Crankcase Oil Heater Location 2 The Reverse Cycle principle key to heat pump economy The heat pump moves or pumps heat, just as its name indicates. As a heating unit, it takes advantage of the fact that even cold, outdoor air contains heat that can be recovered for indoor use. Since it recovers heat, the heat pump produces far more energy than it uses. (Depending on outdoor air temperature, it can actually produce two to three units of heat energy for every unit of electrical energy it uses.) During summer months, the unit can be set to reverse its operating cycle, taking heat from living areas and pumping it to the outdoors. The heat pump’s cost-saving reverse cycle principle uses refrigerant circulated within a compact, closed circuit coil to absorb and transfer heat from one area to another. The process always starts with the evaporator (cooling) coil absorbing heat from the air around it, and ends with the condenser (heating) coil releasing heat to surrounding air. As shown in the diagram, the reverse cycle principle makes double use of the two coils in the single-package heat pump. The coils alternate as evaporator or condenser, depending on whether heating or cooling is required. Heating cycle. Cold refrigerant circulating in the evaporator makes the coil colder than surrounding outdoor air, and heat is absorbed. Refrigerant is then brought to a high pressure in the compressor, becoming very hot. Hot refrigerant flows thru the condenser coil, which is now hotter than air circulating over it. Indoor air received thru the unit’s return air duct is warmed by the hot coil and distributed by the indoor air fan thru the supply air duct to heat the entire building. Cooling cycle. The two coils exchange roles as evaporator and condenser. Although reversed, system operation is exactly the same. Refrigerant passing thru evaporator coil makes it colder than indoor air passing over it, so heat is removed from the indoors. Refrigerant passes thru the compressor and gains more heat. Hot refrigerant makes the condenser coil hotter than outdoor air, and the coil loses heat. The heat transfer cycle is now ready to be repeated. Accessories ® R...