11
Operation
By pressing the test button, valve is opened.
Green LED indicator shows water level in tank.
Short green flashes show that water in tank is
under the threshold.
Long green flashes indicate that the tank is
almost full.
When the tank is full, the green is on
permanently.
Red LED indicator is on permanently during
alarm mode.
In normal mode, EMD measures condensed water level in its tank. When level reaches
threshold, the valve is opened and water is discharged. Period between successive
discharges is from 5s to 7s long. When there is so much water, that EMD HP is not able to
remove it in 90s, it enters overload mode. In this mode, EMD HP opens its valve longer and
more frequently and its capacity is doubled. When EMD HP is still not able to discharge all
the water in 5min, it enters alarm mode. In alarm mode, EMD HP opens its valve so that it
would discharge 50% of its nominal capacity. The capacity in alarm mode is limited to limit
air losses in case of drain malfunction. EMD HP returns from overload or alarm mode to
normal mode when the tank get empty.
Extreme amount of condensed water is possible after maintenance work. In front of
EMD HP, there is valve that is closed during maintenance. Behind this valve, condensed
water collects. After a while, there is so much water that EMD HP is not able to drain it
without entering alarm mode. To avoid entering alarm mode, test button should be pressed
after each maintenance work to discharge all condensed water manually.
Test button
LED indicator
