Beko BUDL 700 Specifications download pdf (Page 27)

Technical description

DRYPOINT

RS 15 – 1700 HP50 NA 27

5.16. Refrigerant Pressure Switches P

-P

As operation safety and protection of the dryer a series of pressure switches are installed in the gas circuit.

PB :

Low-pressure controller device on the suction side (carter) of the compressor, is enabled only if the pressure drops below the

pre-set value. The values are automatically reset when the nominal conditions are restored.

Calibrated pressure : R 404 A Stop 14.5 psig - Restart 72.5 psig

R 404 A Stop 1.0 barg - Restart 5.0 barg

PA :

This high-pressure controller device, located on the pushing side on the compressor, is activated when the pressure exceeds

the pre-set value. It features a manual-resetting button mounted on the controller itself.

Calibrated pressure : R 404 A Stop 417 psig - Manual reset

R 404 A Stop 28.8 barg - Manual reset

PV :

Fan control pressure switch located on the pushing side on the compressor. It keeps the condensation temperature/pressure

constant within preset limits (Air-Cooled).

Calibrated pressure :

DRYPOINT RS 50-100 HP50 NA

R 134.a Start 160 psig (117°F) - Stop 116 psig (97°F) - Tolerance

± 14.5 psig

R 134.a

Start 11 barg (47°C) - Stop 8 barg (36°C) - Tolerance

1 bar

DRYPOINT RS 140-450 HP50 NA

R 404 A Start 290 psig (113°F) - Stop 232 psig (97°F) - Tolerance

± 14.5 psig

R 404 A

Start 20 barg (45°C) - Stop 16 barg (36°C) - Tolerance

1 bar

DRYPOINT RS 550-1100 HP50 NA

R 404 A Start 290 psig (113° F) - Stop 232 psig (97°F) - Tolerance

± 14.5 psig

R 404 A

Start 20 barg (45°C) - Stop 16 barg (36°C) - Tolerance

1 bar

PV1 :

DRYPOINT RS 1400-1700 HP50 NA -

Fan control pressure switch located on the pushing side on the compressor. It keeps

the condensation temperature/pressure constant within preset limits (Air-Cooled) – Low Speed.

Calibrated pressure : R 404 A

Start 304 psig (117°C) - Stop 261 psig (106°C) - Tolerance

1 psig

R 404 A

Start 21 barg (47°C) - Stop 18 barg (41°C) - Tolerance

1 bar

PV2 :

DRYPOINT RS 1400-1700 HP50 NA -

Fan control pressure switch located on the pushing side on the compressor. It keeps

the condensation temperature/pressure constant within preset limits (Air-Cooled) – High Speed.

Calibrated pressure : R 404 A

Start 334 psig (124°C) - Stop 297 psig (115°C) - Tolerance

1 psig

R 404 A

Start 23 barg (51°C) - Stop 20.5 barg (46°C) - Tolerance

1 bar

5.17. Safety thermo-switch T

To protect the operating safety and the integrity of the dryer, a thermo-switch (TS)

is installed on the refrigerant gas circuit. The thermo-switch sensor, in case of

unusual discharge temperatures, stops the refrigerating compressor before it is

permanently damaged.

Manually reset the thermo-switch only after the nominal operating conditions have

been restored. Unscrew the relative cap (see pos.1 in the figure) and press the

reset button (see pos.2 in the figure).

TS setting : temperature 212 °F (+4 / -4 °F)

temperature 100 °C (+2 / -2 °K)

5.18. Compressor crankcase heater (DRYPOINT RS 700-1700 HP50 NA)

At low temperatures oil can more easily be mixed with the refrigerant gas. So, when the compressor starts, oil can be

drawn into the refrigeration circuit and liquid hammering could occur.

To prevent this, an electrical resistance heater is installed in the suction side of the compressor. When the system is

powered and the compressor is not running, this heater keeps the oil at the correct temperature.

This heater is controlled by a thermo-switch which prevents overheating the oil.

NOTE : The heater must be powered at least a couple of hours before the start up of the refrigeration compressor.

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Beko BUDL 700 Specifications Page 27

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