MNL-0408
June 11, 2009
Page 47
closes. After the compressor has attained nominal speed, pressure builds in the intermediate separator
and the control air closes the condensate drain valve (4). Once the valve closes, the compressor 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 intermediate filter (2). This action in turn removes the control air form
the condensate drain valve which opens and drains and relieves the pressure in the oil and water separa-
tor.
3.2.2
ACD Maintenance
The condensate drain valves are provided with manual drain valves to verify correct operation of the
automatic system.
The automatic condensate drain system must be serviced once a week as follows:
1. Open all manual drain valves one after the other.
2. Observe the drainage of condensation.
a. If the system drains more than 2 ounces of liquid per stage, either the system or the corresponding
condensate drain valve is not working properly.
b. Find the fault and remedy accordingly.
3. If little or no condensation emerges, the automatic system is operating properly.
4. The condensate collection tank should be emptied regularly. Due care must be taken to ensure that
any oil which is drained with the condensation is disposed of properly. Check local, state and fed-
eral regulations.
^
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.
