MNL- 0345
Page 60
Section 3
Base Edition
3.2.1.3
Start Unloading
The unloading of the compressor during the starting phase is possible because of the lack of control air
immediately after starting the unit. As the unit is switched on the solenoid valve (1) is energized and
closes. After the compressor has attained nominal speed, pressure builds in the intermediate separators (2
and 3) and the control air closes the condensate drain valves (4 and 5). Once these valves close, the com-
pressor delivers to the consuming device.
3.2.1.4
Standstill Drainage
At compressor shutdown, the solenoid valve (1) is deenergized and opens. This drains the condensate and
relieves the pressure in the 2nd stage intermediate separator (2). This action in turn removes the control
air form the condensate drain valves (4 & 5) which open and drain and relieves the pressure in the 3rd
stage intermediate separator (3) and oil and water separator (6).
3.2.1.5
Condensate Drain Piping
The outlet opening of the condensate drain manifold is equipped with a tube connector. From here the
condensation is directed into a collecting bottle by means of a tube to the pre-separator elbow and a con-
densate drain separator.
3.2.1.6
Electrical Connections
For electrical connection of the automatic condensate drain, refer to any included wiring diagrams.
3.2.1.7
ACD Timer
Automatic condensate drain timer controls the frequency of the drain intervals and the duration of the
drain period of the solenoid valve. This timer is a 12VDC, solid state, encapsulated, recycling timer. Both
the on and the off times are adjustable. Its range is 1-100 minutes on, 0.1-10 seconds off.
CAUTION
The condensate drain interval is adjusted at the factory. If the regular operating time of the compressor unit
is less than the drain cycle, adjust the timing relay accordingly to ensure regular draining of the oil and
water separator. If the compressor is shut off before the first drain cycle is completed, the timing relay
would be reset each time causing the drain cycle to be started again. The condensate drain cycle would
never be completed, which could result in flooding of the separator and damage to the connected systems.