Piping Coil
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More Great Information on Piping Coil:
Solenoid Valve Applications - Evaporator Temperature Control by Saphia
A solenoid valve installed in the liquid line as close to the evaporator as possible, in conjunction with a narrow differential thermostat, is an excellent temperature control. By mounting the thermostat bulb in the supply or discharge air across the evaporator, the temperature swing is limited only by the differential of the thermostat.
This type of temperature control can be used on a single or multiple evaporator system and is particularly useful on multiplexed systems with evaporators at different temperatures.
Defrost Pump Down
In situations where the condensing unit is installed in a low ambient, such as on a rooftop in northern climates, and the evaporator is operating at a temperature above the ambient, a pump down solenoid valve should be used. This allows the pressure control to be set at a cut out of 1 to 2 psi and the cut in to be set at a pressure below the pressure corresponding to the ambient temperature. This will ensure that the condensing unit will start after cooling down during the defrost.
When a system has a defrost pump down solenoid valve, a thermostat should be used in series with the defrost time clock to control the temperature of the space or fixture. An alternative to the thermostat would be an evaporator pressure regulator.
Note: System diagrams are for illustrative purposes and are intended to show application of solenoid valves only.
Heat Reclaim Systems
Basically, there are two types of heat reclaim systems: the series system and the parallel system.
In the series system, during normal operation, the discharge gas is condensed completely in the condenser. During the heating mode, the normally opened solenoid valve closes off the condenser and the normally closed solenoid opens to allow the discharge gas to flow into the heat reclaim coil. Complete condensation can occur in the heat reclaim coil if so designed, but manufacturers often prefer to take advantage of all the sensible heat available but only part of the latent heat, depending on the condenser for complete condensation.
In the parallel systems there are, in effect, two separate condensers. During normal operation, the condenser is used for complete condensation of the discharge gas. In the heat reclaim mode the discharge gas is completely condensed in the heat reclaim coil, thus maximizing the use of both sensible and latent heat. Some manufacturers recommend installing a 1/4-inch line from the heat reclaim coil, at its lowest point, back to the receiver to ensure the proper drainage of oil and liquid refrigerant during the off cycle. Other manufacturers suggest the installation of a pressure control, to ensure that the system will switch from the heat reclaim mode to the condenser in the event of fan stoppage or clogged filters.
Split Evaporator â" Humidity Control
There are often times when the air temperature is satisfactory but the humidity level is too high. This can be remedied by using only half the evaporator to dehumidify the air without excessive cooling and the addition of auxiliary heat. This can best be accomplished by using a normally open solenoid valve on one half of the evaporator controlled by a humidistat.
Hot Gas Defrost System
Hot gas defrost offers an excellent alternative to electric or air defrost. In this system the hot compressor discharge gas is routed to the outlet of the evaporator. This hot gas warms the evaporator, thaws any frost that has accumulated, condenses into a liquid, and flows into the common liquid line to feed the other evaporators.
In order for this system to work properly, check valves must be installed to allow flow around the expansion valves. A pressure reducing valve should be used in the liquid line to provide a pressure differential between the condensed refrigerant leaving the defrosting evaporator and the common liquid line.
The system shown is drawn with only two evaporators but it is recommended that only 25 percent of any multiplexed system be hot gas defrosted at any given time.
An alternative to the hot gas defrost system is the cool gas defrost, which uses the gas from the top of the receiver to defrost the evaporators. Because the cool gas defrost operates at a lower temperature, the thermal expansion of the refrigeration lines is reduced. This often eliminates the need for special piping techniques and leaks caused at line connections by excessive thermal flexing.
Capacity Control System
A simple method of providing compressor unloading is to use a solenoid valve connecting the discharge and suction lines of the compressor. The solenoid valve is controlled by a pressure control which responds to suction pressure. When the switch closes, it opens the normally closed solenoid valve and discharge gas is short circuited back to the suction side of the compressor.
In order to prevent overheating of the compressor, a thermostatic expansion valve should be installed to provide cooling to the compressor suction gas. An alternative method consists of injecting hot gas into the evaporator inlet. This prevents overheating of the compressor and increases the velocity of the gas through the evaporator.
This type of unloading should not be attempted without thorough analysis of solenoid valve and expansion valve sizing.
Liquid Line Shut-Off
In an effort to obtain a higher efficiency rating on residential and commercial air conditioning systems, a normally closed solenoid valve typically is installed in the liquid line located near the air handler or furnace. In this case, the solenoid valve is wired in parallel with the contactor circuit (24 VAC) and may require a larger transformer to accommodate the valve.
As an alternative method, a normally closed solenoid valve may be located in the liquid line near the condensing unit and wired directly to the compressor motor terminal box. This solution improves system efficiency and maintains the refrigerant charge in the condenser coil during the off-cycle of the compressor which prevents refrigerant migration when long piping runs are used.
If the solenoid valve application requires a fail-safe or open mode, a normally open solenoid valve may be used. In this instance, the valve may also be located in the condensing unit and wired in series with the compressor crankcase heater.
Ningbo Lida Pneumatic Complete Sets Co.,Ltd. specializing pneumatic components,solenoid valve,air cylinder & pneumatic fittings that these are inexpensive.It has with more than 15years.
Article Source: http://www.earticlesonline.com/Article/Solenoid-Valve-Applications---Evaporator-Temperature-Control/773669
when i press my gas petal my car does not accelerate what can i do to fix it?
have changed the spark plug wires, sp's, alternator, removed cat converters to straight pipes, coil packs,
sorry pedal*, its a 97 ford crown vic police, i have it in gear and running but when i press the pedal it does not accelerate nor do the rpm's go up
fluid levels are all fine i have not checked the fuel pump (idk why) but i have changed the air filter, tranny is not slipping
car will crank and run for a min before it idles to low and cuts off, it will move in gear and is possible to drive but wont accelerate over 5-10mph, had new battery, didnt help, machanics all say its one thing i fix that and it doesnt fix the main problem
What kind of car you have? Check throttle position sensor (TPS). Also mass airflow sensor (MAF). Is "check engine" light on? It should turn on after you start your car and turn it of few times while keep having that throttle problem. The code will tell you most probable cause. Also your fuel pressure regulator may not work properly, or even your fuel pump. What happens when you push your gas pedal, nothing, engine dies, becomes erratic or revs up but really slowly? Give us complete description of a problem. Lots of time it would be just some old vacuum hose breaking off the intake manifold. Vacuum leak will cause that.
I bet you check engine will read "multiple cylinder misfire detected". Yep, it`s a vacuum leak dude. Big one, you should be able to tell where by just listening around the intake manifold.
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