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- He suggests always using a trinary switch with electric fans, and tells us that a binary switch can be easily swapped out for a trinary switch as long as the binary switch is a female version that screws into a Schrader valve. He said, “If the switch is a male version that screws directly onto the receiver/drier, the refrigerant will need to be recovered before changing the switch, and then re-charged.” - Source: Internet
- For those who are using electric fans as a primary cooling component, he does recommend using a trinary switch to control the the fan(s). He said, “The fan control component of the trinary switch will be wired in parallel with the engine temperature switch so that either the engine temperature or A/C system pressure will engage the fan(s). This arrangement allows the vehicle to engage the fans when airflow is needed, either with engine temperature or the A/C pressure.” - Source: Internet
- The condenser fan is operated both for reasons of safety, i.e., to prevent the coolant pressure in the condenser from reaching the tightness pressure of the pipes in the air- conditioning system in which the coolant flows, and to maintain an acceptable performance of the air-conditioning system. A condensation pressure that is excessively high, in fact, causes a consequent increase in the coolant pressure in the evaporator and, hence, also of the conditioned air temperature at the evaporator outlet. - Source: Internet
- We often get asked about adding an additional (pusher) fan to the condenser, switched on when the A/C is turned on. Rick stated that an auxiliary fan isn’t needed if you have an efficient electric fan package. “Puller fans are inherently more efficient than a pusher design, so the best solution is to have a good puller fan package,” he said. - Source: Internet
- For the condition wherein actual high pressure P h is less than the critical pressure of the refrigerating fluid and the radiator operates as a condenser, the patent application referred to above teaches instead a radically different approach for controlling the switching-on and the rotational speed of the fan. In particular, for sub-critical operating conditions, there is suggested that condensation pressure P h be not controlled, and that, at one time: a) the super-cooling degree of the refrigerating fluid leaving the radiator be controlled and thereby kept within a predetermined range, by controlling the opening degree of an electronically controlled expansion valve, so as to enhance a coefficient of performance (COP) of the system; and b) the cooling capacity of the radiator be controlled by varying the fan speed in response to variations in the condensation pressure P h . This solution involves a major computational load for the electronic control unit of the air-conditioning system, since the latter has to implement both a control algorithm of the expansion valve and a control algorithm of radiator fan. - Source: Internet
- Another time when electric fans are used is when a front drive system is used, such as Vintage Air’s Front Runner system, which uses a serpentine belt system to drive all components. These systems typically won’t have a provision for using the mechanical fan, so a single or dual electric fan must be used. As with many of our applications, a shroud for the electric fans is available and should be used where applicable. We don’t typically recommend or offer a auxiliary (pusher) fan if your system is cooling properly. - Source: Internet
- So the two functions of the binary switch are to determine high or low pressure and to protect the compressor. The trinary switch will serve the same two functions, and add a third function: to engage an electric fan once the pressure reaches 254 psi. The trinary switch can be wired to provide a ground or +12 volt signal for fan engagement, but Rick warns us, “The trinary switch signal should only be used to trigger an electric fan relay, or provide an input to the engine control ECU, and never to provide current directly to the fans.” - Source: Internet
- (generally air) . Air-conditioning systems are further provided with a fan which is arranged downstream of the evaporator and is operated to push conditioned air into the passenger compartment of the motor vehicle, and a fan which is arranged in front of the condenser and is operated automatically to maintain, the coolant pressure in the condenser (condensation pressure) at optimal values in all operating conditions. Operation of the condenser fan determines, in fact, an increase in the air flowrate impinging upon the condenser, thus determining a reduction of the condensation pressure. - Source: Internet
- As you might guess, the binary switch provides two functions, while the trinary switch provides three functions. Rick tells us, “A Binary switch provides low and high pressure compressor, and system, protections. The switch will disengage the compressor – or prevent the clutch from engaging – at a low pressure less than 30 PSI or low/lost refrigerant condition. It will also disengage the compressor if system pressure builds in excess of 408 PSI, which is usually a lack of sufficient airflow through the condenser.” - Source: Internet
- Typically, the switching-on, switching-off , and the rotation speed of the condenser fan are controlled via a pressure switch calibrated on a number of threshold values of the condensation pressure. When each of these threshold values is exceeded, the condenser fan is operated at a corresponding rotation speed. In the majority of air-conditioning systems of modern motor vehicles, the condenser fan is operated at two levels , so that when a lower threshold value is exceeded the condenser fan is driven at a lower rotation speed, whereas when a higher threshold value is exceeded the condenser fan is driven at a higher rotation speed. - Source: Internet
- For a system with a mechanical fan as the primary cooling component, he added that an auxiliary pusher fan can help with cooling the condenser and radiator, because engine-driven fans are less efficient at lower RPMs. A good mechanical fan is often sufficient to keep an engine at operating temperature. Remember: the main reason auto manufacturers started switching to electric fans is because they started turning the engines sideways for front-wheel drive vehicles, so a mechanical fan was eliminated on those engines. Mechanical fans are still used on many rear wheel drive cars and trucks today. - Source: Internet
- If you do choose to add an auxiliary fan to assist with cooling, it’s not necessary to have that fan on at all times when the A/C is on. “There really isn’t any reason to run the fan when the vehicle is running down the highway,” Rick said. “Ram air will provide sufficient airflow if all proper ducts and inner fenders are in place.” When one is added, he recommends connecting an auxiliary fan in the same manner as a primary cooling fan: to be triggered with either temperature or pressure, and not full time. - Source: Internet
- Rick suggests that the condenser should not be mounted directly to the radiator, but should be at least 1/8-inch away from the radiator. He stated, “The 1/8-inch air gap will prevent direct contact heat transfer, and insure that the air flows through both the condenser and radiator.” However, if the condenser needs to be mounted further from the radiator, he suggests using a shroud to fill the gap between the two components to help insure the airflow passes through the radiator without escaping around it. - Source: Internet
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