Weak current College】 【room air-conditioning installation process.

<br> <br> Refrigeration piping installation <br> In should be carefully before installing, make sure that the refrigeration pipes clean and dry. Should take the following steps: <br> A. dehumidification of compressor or filtering drying device is exposed to .the atmosphere of time should be as short as possible (recommends a maximum of one to two minutes). <br> B. use only special copper tubes for refrigeration and sealed to prevent pollution. Water often contains wax and other pollutants caused by failures. .<br> C. field installation systems, the use of permanent suction-line dry filter and hydraulic hose drying filter. <br> D. suction pipe to compressor direction every 10 inch tilt 1 / 2 inches. <br> E. each suction .tube bottom mounted suitable set oil pipe, to increase the oil return to the compressor. <br> F. in the refrigeration piping welding, pipe should be filled into the low pressure of inert gas to prevent oxidation and scale the tube wall, best use .of dry nitrogen. <br> G. liquid pipeline in the suction and only use suitable silver welding alloys or 95 / 5 solder, and in the exhaust pipe only uses high-silver solder alloy brazing. <br> H. to avoid damaging the .shock takeover of internal connectors, and the shock tube connections, such as application, melting point as EAST-FLO 900F-1200F silver welding alloy brazing. <br> I. solder paste or fluxes amounts to as much as possible restrictions to prevent internal weld .point of pollution. Flux only adds in the joint Department of the convex, must not be added in the valleys. In brazing with wet cloth to wipe away excess flux. <br> J. If the suction or exhaust pipe installation, you must press .the shock absorber factory requirements. Copeland Copelametic semi-enclosed motor compressor best location should be installed in parallel with the crankshaft is, as far as possible, and compressor. If the shock absorber is sealed connectors, you can prevent condensation water freezing and damage to .the bellows joints, this kind of shock absorbers can be installed vertically. Recommended soft solder fill interface as a seal. And at right angles to the horizontal crankshaft is not advisable. Because the compressor motor made of stress, could damage the bellows and refrigeration piping .. <br> K. need two vacuum valves, one in the suction pipes, the other one is installed in the reservoir fluid is a liquid pipeline in the vicinity. <br> L. good in all pipe connections, you must make the entire .leak detection system. Refrigerants and dry nitrogen or dry carbon dioxide, the entire system pressure to the pressure of not more than, 175 lb / 2 inch (PSIG) (about 12.3kg/cm2) for leak detection. It is best to use electronic .leak because it on a tiny leaks have higher sensitivity. Prior to the injection of a refrigerant system should find time to 1 lb / 2 inch absolute pressure (PSIA) (about 0.07kg/cm2) or less and seal placed 12 hours as further leak .detection system. Air slightly infiltrated the system vacuum reading will be reduced. If you find that air leakage, the whole system should be leak detection and repair again, as a qualified installer, the system must closely does not leak. <br> M. .last leak after exposure to high temperature environment of refrigeration piping heat insulation layer of protection should be to reduce the heat absorption and prevent liquids pipeline within the Flash gas. Suction pipe if it is exposed, it should have insulation layer of protection to prevent open condensate .. <br> Condensation water pipe installation <br> Good action must do the following: <br> A. pipe arrangement should be inclined to make it sufficient to use gravity to exclude condensate, defrosting or clean the formation of sewage. <br> .B. all fittings to connect to the local pipe operation method. <br> C. refrigeration plant condensate pipe to pass water bends received open drainage Department. If you are not permitted for water-cooled systems, condensing pipe directly connected to the sewer pipe .. <br> D. water pipe size should be at minimum water pressure can provide requirements. <br> E. control devices such as: solenoid valve, control valve or may lead to fluid energy impact of manual valve should be fitted with straight pipes .and air bags to absorb these shocks. Electric control valve or pressure control valve should be installed in the water and condenser inlet - must not be mounted on the condenser and drainage pipes. If the water pressure is too large, you should use a pressure reducing .valve, because water valve allowed working pressure usually 150PSIG, pressure is higher than this value will cause damage to the condenser. <br> F. you must check the pump performance and direction. <br> G. leaks. <br> <br .> Vacuum <br> Should be good high vacuum pump with brass or high vacuum tube (diameter at least 1 / 4 ") to connect to high-voltage parts of vacuum valve. If the compressor is maintenance of valve (suction valve), they .should remain closed. In the system should be installed to Micron Hg-high vacuum table. <br> In the vacuum table header and the vacuum pump should be equipped with stop valve for vacuum after detection system pressure. When the pump is connected to the .system, close the valve shut off the vacuum pump before don't. Vacuum pump should be pumping to 1500 Micron mercury - now through the dryer to lines to join some refrigerants to destroy the vacuum State, until the system pressure exceeds the "0" .PSIG. <br> Then repeat this step. <br> 1) open the compressor repair valve (if any), and the entire system vacuum to 500 microns of mercury. <br> 2) refrigerant to be pressure to 2PSIG and switch off .the pump. <br> 3) when the system is in high vacuum is in any case not to start and run the compressor or they will motor cavity air dielectric strength decreases causing serious damage to the motor coil. <br> <br> Operation .check <br> The filling system and under normal conditions for trouble-free operation at least 2 hours later, you can automatically control the operation of the condition of night, and then follow the steps below to perform a comprehensive review of the entire system: .<br> A. check compressor cylinder exhaust and inlet pressure, as it is not within the scope of the system design, to identify the cause and take corrective measures. <br> B. check the fluid lines and expansion valve, if there are .indications that require more refrigerant, then all connections and system components for leak detection, refrigerant leak before the patch is good. <br> C. OutlookRichard compressor crankcase oil level and, if necessary, come to the sight of the Central Office. <br .> D. check the thermostatic expansion valve superheat set value, the temperature of the package must be the suction full contact, valve superheat set too high, the cooling effect, and will result in oil. Superheat set too low can cause cooling capacity reduction and .refrigerant reflow and compressor bearing damage. Necessary to prevent the liquid refrigerant flow into the crankcase during normal operation, if the system is unable to obtain suitable control, you must immediately in front of the compressor suction on the installation of a gas-liquid separator, .liquid refrigerant to prevent entering the compressor. <br> E. use suitable instruments to carefully check the compressor terminals for voltage and current, voltage error must be limited in the compressor nameplate regulation value within 10% of positive and negative. If the voltage is .too high or too low, please notify the power companies. Normal current should not exceed nameplate rating of 120%. If current is too large, should immediately identified, corrective measures. In the three-phase motor-compressor, check each phase of the .load is balanced. <br> F. air cooled condenser, evaporator, etc. all fan, you should check whether the correct direction of rotation. To check whether the installation of the fan motor and fastening, if you use a belt drive, check .the tension of the belt, the motor if you require lubrication, oil should be injected. <br> G. Copland condensing unit on high voltage controller allowed by the maximum setting values are as follows: <br> R12, R22 and R502 <br .> Air cooling: 295psig (about 20kg/cm2) 395psig (about 27.5kg/cm2) <br> Water cooler: 295psig (about 20kg/cm2) 295psig (about 20kg/cm2) <br> Check the following: wind-cooling system ., you can turn off the fan motors or blocking the condenser inlet air; in the water cooling system should cut off the water supply. Observation of pressure table disconnect. Recheck all the safety and operation of the controller is functioning correctly, if necessary, be .adjusted. <br> H. check defrost controllers defrosting start and end points, the duration for the determination of defrosting. If you use a crankcase heater checks the heater. <br> I. check winter exhaust pressure controllers and pressure set value. < .br> J. check crankcase pressure regulating valve of the set value is appropriate. <br> K. adjust water cooling system of the water valve to maintain the required temperature of condensation. Check whether the normal pump functioning. <br> L. check .for installation instructions and control system wiring diagrams, for use in charge or owners. <br> <br> <br> <br>.