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What is the fan speed relationship to suction pressure?


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2005-08-18 15:38:31
2005-08-18 15:38:31

for a given air conditioner: the faster the condenser (outdoor) fan the lower the suction pressure. the faster the evaporator (indoor) fan the higher the suction pressure.


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The fan powered by a motor creates suction which pulls the dust into the cleaner nozzle (head) into the bag, filters or cyclones.

Fan regulators are similar to light dimmers. Their function is to control the speed of the fan. The regulator uses resistances for the speed of the fan. It acts as a divider and the speed changes based on the resistance.

Remember that suction refers to the low side, and is showing you what is happening with in the evaporator coil. Higher than normal pressures indicate the refrigerant is not transferring its heat into the air passing through evaporator coil. You need to assess the air flow, are the filter or coil dirty, or is the ducting blocked, fan speed set up correctly. Try cleaning coils and a light weight filter, then recheck pressures.

IT COULD THAT YOUR SYSTEM IS EITHER OVERCHARGED OR UNDER CHARGED. ALSO CHECK YOUR FURNACE FILTER.AND MAKE SURE YOUR OUTDOOR UNIT is clear of dirt and obstructions. --------------------------------------------------------------- There are several reasons for a compressor to overheating High compression ratios are the result of either lower than normal suction pressures or higher than normal discharge pressures. Changes in suction pressure will affect the compression ratio more rapidly than changes in the discharge pressure. For this reason, it is important to keep the suction pressure at its highest possible value. Causes of low suction pressure can include incorrect sizing of components, misadjusted or defective metering devices (TXVs), loss of refrigerant charge, plugged driers or strainers, and excessive suction line pressure drop. Although not as sensitive to change as the suction pressure, the discharge pressure can still greatly affect the compression ratio. Keeping the discharge pressure within normal operating conditions is still important. Causes of high discharge pressure can include dirty condensing coils, undersized discharge line, a blockage or recirculation of condenser air, erratic condenser fan operation, refrigerant overcharge, noncondensibles in the system, and an undersized condenser.

Downdraft systems have a suction unit (fan) mounted below the cooking surface and a vent pipe going outside. When the fan is on, the suction pulls the air containing the smoke and odors down and pushes them out the exhaust vent.

The external static pressure of a fan is the pressure measured at the discharge of the fan and includes all the duct losses from the fan until it reaches the discharge point. When measuring the external static pressure you must subtract the velocity pressure of the airstream from the total pressure measured by the gage. External static pressure is not total static pressure. Total static pressure is the difference between the external static pressure and the measured pressure at the fan inlet. If the pressure is measured at the inlet duct you must also subtract the velocity pressure from the measured pressure.

same as low speed relay its call fan mode

This fan has three speed settings, low, medium and high.

Okay, to get the static pressure in your duct to from 0.5" water gauge (w.g.) to 1.5"w.g., you could add another fan in series. Or, depending on your existing fan and motor size, you may be able to speed up your current fan to the pressure value desired. Additional airflow would be dampered down.

There are three speed settings for this fan and it rotates 90 degress.

FD or Forced Draft Fans supply combustion air to the boiler. Different combustion controls demand a supply of combustion air in different ways but what they have in common they control the FD fan to provide enough air for complete combustion in the boiler furnace. In most systems in use today the ID or Induced Draft fan sucks the products of combustion from the boiler furnace, through the various passes of the boiler and pushes it out the chimney. How much or how fast this fan works is based on furnace pressure. The ID fan control set point is based on combustion side furnace pressure. If the furnace pressure goes up the ID fan removes more air to lower the pressure. As the furnace pressure goes down the ID fan removes less air. This air flow out of the boiler is referred to as draft. Both the FD and ID can be controlled by various means. The air flow can be restricted in the plenum or ducts by dampers or louvers or the speed of the fan can be changed by mechanical means from a fixed speed driver. Also the speed of the fan can be changed by the use of a variable steam turbine or an electric motor with VFD (Variable Frequency Drive)

A regulator controls the speed of a fan by limiting the amount of power being output. This allows a single fan to operate at many different speeds.

They were brother and sister

Fans are activated by the PCM using engine coolant temperature, vehicle speed, and air conditioning high side pressure status to determine coolant fan operation.

There should be a smaller plastic box behind the fuse box in the engine compartment. There you will find the high speed fan relay as well as the low speed fan relay.Good Luck

yes,certain amount of electricity is wanted for the fan to rotate.and then if the fan rotates at slow speed less amount is needed and at high speed more is needed.GOT IT

no need to check, just replace the whole fan that has a little control module in the fan itself to control the speed as well

The optimal fan speed depends on the size of the heatsink and the clock rate of your processor. As such, there is no single answer.

A fan regulator is a crucial component that serves to increase or decrease the speed of your fan according to your needs.

if fan make a loud noise your fan clutch is bad

Mean of rpm is in fan is that in a minute how much revulation is completed by a fan.

Through a restrictive process of limiting the amount of electricity to the fan motor.

The fan speed is really dependent on the size of the heatsink. A large heatsink can use a slower fan, while a smaller one will need a much faster fan.

To understand why air rushes into a vacuum cleaner nozzle we need to trace air flow in the machine. Let's do that. The motor in a vacuum cleaner spins a fan, and the fan moves air. The air intake for the fan is connected to ducting that is routed to the nozzle. As the fan forces air out in its exhaust stream, it creates low pressure on the suction side of the fan. This low pressure (a partial vacuum) is felt along the air path to the nozzle. At the nozzle, outside air pressure forces air into the ducting where air pressure is lower. The moving air has picked up debris and carries it along. That debris ends up in a bag or filtered dirt canister or someplace else where it can accumulate and be collected for disposal. This applies to machines that have bags or filters to get the debris out of the air stream before it goes through the motor to keep it cool. Some machines isolate the motor from the air stream created by the fan, and the motor is cooled by another fan. These "direct" vacuums operate in a way that sees the air stream and the debris pass through the fan and be driven into a bag. The operation of the fan has created a low pressure area along the ducting between it (the fan) and the nozzle. Outside air pressure, being greater than the low pressure created by the fan and ducted to the nozzle, forces air into the nozzle.

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