Specifications

23G-Series RO System
3024270 Rev G 79 14Oct13
6.1 Level Controls
Float switches pressurized storage tank switches or other level controls
may be connected to the ECM-100’s tank level control inputs. To
recognize the tank level status, the ECM-100 must be in the AUTO mode.
A level control system with “one” input signal may be connected to the
ECM-100 across terminals 17 and 18 of the main strip. Terminals 40 and
41 must be jumpered together in this case. An open status will shut down
the machine and a closed status will allow it to run.
CAUTION:
The level control contacts must be dry, non-powered, and compatible with
5 V signals.
NOTE:
The level control feature of the ECM-100 can be configured for two inputs
– a high level (tank full) switch and a low level switch. If properly
connected, when both switches open, the ECM-100 will shut down the
machine and illuminate the blue Tank Full LED light. As the level in the
permeate storage tank drops, the high level switch will close but the
machine will remain locked-out until the tank level drops to the height that
causes the low level switch to close as well. When both switches are
closed, the ECM-100 will restart the machine. As the level in the tank rises
and the low level switch opens, the machine will continue to run. Only
when the high level switch opens will the machine shut down. To utilize
the two input configuration, connect the level controls to terminals 17 and
18 and terminals 40 and 41. See Figure 1.3 for connection points.
It is possible to connect the high and low level switch inputs in reverse
positions on the ECM-100 terminal strip to achieve level control of a feed
water ballast tank. In this case, the machine will shut down on an “empty”
tank condition.
NOTE:
If the machine operation is controlled by the lockout status of
pretreatment, but not controlled by a storage tank level, then jumper wires
must be installed between terminals 17 and 18 and between terminals 40
and 41. The machine must be in AUTO mode to recognize the
pretreatment signal or tank level signals.
CAUTION:
In all cases “dry” contacts must be used. This eliminates the possibility of
voltages from any other source feeding into the ECM-100 terminals.