The company offers 3 types of pumping stations:
> PS1 and PS2 series refrigerant pressure switch
The pressure switch is an integral part of any refrigeration installation. They are used to protect the system from excessively high or low pressure depending on the set value. In addition to protective functions, pressure switches can be used to regulate the condensing pressure and turn off the compressor “during the pumpdown cycle”. The pressure switch ensures long-term and safe operation of not only the compressor, but also the entire installation as a whole.
PS1-(1)(2)(3) PS2-(1)(2)(3)
| 1. Function | 2. Pressure range | 3. Connections | |||
|---|---|---|---|---|---|
| A= pressure switch, automatic; IN= trip relay with external manual reset; WITH(for PS2) = left side of dual relay - automatic pressure limiter; right side of the dual relay - shutdown with external manual reset; G(for PS2) = left side of dual relay - trip relay with external manual reset; the right side of the dual relay is a fuse with a pressure cut-off function with internal manual reset; L(for PS2) = left side of dual relay - automatic pressure switch; the right side of the dual relay is a pressure switch with internal manual reset; R= pressure switch with external manual reset; S= fuse with pressure shut-off function, with internal manual reset; W= pressure limiter, automatic; |
S= ¼ SAE internal thread with nipple and damper K= 1 m. cap. tube with nut ¼ SAE L= ¼ ODM with 1m drip tube. U= soldering 6mm ODF X= soldering ¼" ODF A= ¼ SAE ext. thread G= G¼ internal R= G¼ outer |
||||
| Range (bar) |
Max. permissible pressure (bar) |
Test pressure (bar) |
|||
| 1,9. | -0,75… 3 | 11 | 13 | ||
| 2. | -0,8… 1,5 | 11 | 13 | ||
| 3,7. | -0,5… 7 | 22 | 24 | ||
| 4. | 1…20 | 20 | 23 | ||
| 6. | 4…12 | 14 | 16 | ||
| 5,7,8,9. | 6…31 | 31 | 35 | ||
| Model* | Regulation range | |||
|---|---|---|---|---|
| Working pressure bar) | Differential(bar) | |||
| left | right | left | right | |
| PS2-G8A (Dual) | 6…31 | 6...31 | manual return high | const. 4 |
| PS2-A7A (Dual) | -0.5...7 | 6...31 | 0.5...5 | const. 4 |
| PS2-L7A (Twin) | -0.5...7 | 6...31 | 0.5...5 | manual return high |
| PS2-R7A (Dual) | -0.5...7 | 6...31 | manual return to low | manual return high |
| PS1-A3A (Single block) | -0.5...7 | 0.5...5 | ||
| PS1-R3A (Single block) | -0.5...7 | manual low pressure return | ||
| PS1-A5A (Single block) | 6...31 | 2...15 | ||
| PS1-R5A (Single block) | 6...31 | manual high pressure reset | ||
*In addition to the standard pressure switches shown in the table, Alco-Controls produces a number of models for OEM manufacturers (for orders of 100 pcs.).
| vendor code | Connection | Voltage | Frequency | Current | Power | On-off pressure | Max pressure | Operating temperature (degrees) | |
|---|---|---|---|---|---|---|---|---|---|
| (W) | (HP) | ||||||||
| PS-02B | 1/4 nut | 220V | 50Hz | 16(12)A | 2200(1500)W | 2Hp | 1.4-2.8bar | 6bar | 1-55 |
Pressure switch PS-02B
Water supply systems can be monitored and controlled by different parameters - water level, pressure, temperature. The most common is pressure control. One of the simplest and most popular elements of home automation in this case is a pressure switch
This relay is designed to control electrical pumps to supply water to the house. Using a relay, the pump will operate accurately in the specified pressure mode. At minimum pressure, the contacts will close and the pump will turn on, and when maximum pressure is reached, the contacts will open and the pump will turn off.
This is a two-contact relay for switching electrical circuits, which is triggered by water pressure in the system. Inside its body there are electrical contacts that are controlled by a membrane.
The pressure switch is most often connected to pumping station using a special quintuple adapter. In addition to the pressure switch, a pipe from the pump, a pipe from the water supply source, a hydraulic accumulator and a pressure gauge are connected to the adapter.
The pump pumps water into the accumulator. According to the pressure gauge readings, you can observe how the water pressure increases. The pressure switch automatically controls turning the pump on and off.
When the relay is connected to the adapter (connecting size - 1/4"), water presses on the membrane, which presses on the springs that control the electrical contacts. The relay contacts are connected in series with the pump electric motor and supply power to it.
The operating principle of the pressure switch is very simple. If the pressure in the system drops below the switch-on level (1.4 bar or a preset value), then the contacts will close and the relay will turn on the pump, and if the pressure in the system is higher than the switch-off level (2.8 bar or also a preset value) , the membrane presses on the springs, the contacts open and the pump automatically turns off. If the pressure drops below the set value, the process is repeated.
Thus, the pressure switch is used to automatically maintain the water pressure in the water supply system in the operating range of 1.4 - 2.8 bar (factory pressure settings) or 1 - 5 bar (manual settings).
At the factory, these relays are configured according to existing standards and regulations. As a rule, the settings do not need to be changed, because they are the most optimal. Sometimes it becomes necessary to configure the relay to its own operating parameters, different from the factory ones. You can achieve the desired result in adjustment by rotating the two clamping nuts in different directions.
To do this, you need to remove the cover from the relay. There are two nuts in the body - large and small. Using a large nut, you can set the pump shut-off pressure. To increase the response threshold, you need to tighten it clockwise and check the pressure. Using the second nut, you can change the difference between the pressure on and off the pump, both up and down.
All these adjustments must be made using a pressure gauge. After adjusting the relay, be sure to close the cover.
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