OUMAN EH-203 User Manual Download

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OUMAN EH-203

RELAY 2 CONTROL SELECTION

OUMAN EH-203

Relay2 ctrl sel

Not in use
Parallel pump
Time program
230V actuator
El.Heater ctrl

When the relay is inactive (timing program "OFF" mode or no electricity
to actuator) the space between contacts 71-72 is open in the relay.

Press the

button to move the cursor to “Relay 2 control”. Press

EH-203 has two 230VAC/6A relays for relay controls; relay 1 is a break
before make contact relay and relay 2 is an on/off relay.
The following functions can be implemented with relay 2:

1. Parallel circulation pump control
2. Timing control that can be labeled (GSM control compatibility)
3. 230VAC actuator 3-point control (needs both relays)
4. Heating resistor control according to the temperature of meas. 10.

Press the

button to move the cursor to the control mode that you want to

use. Press
The

character indicates which control mode is being used.

OK.

Not in use:

Pump:

Backup pump/ Auto:

HW pump/ Auto:

Alternate pump/ Auto:

Relay 2 is not being used.

Select Auto normally for pump control. Select ON and OFF for start-up tests

and during maintenance periods. Select ON for the pump to run continuously.
Select OFF for the pump to stop.

If pump 1 stops (over current protection is triggered, see

digital inputs p.32) the controller automatically switches on the backup pump
(pump 2) and gives an alarm from pump 1. (Pump 2 control occurs via connectors
71 and 72.) Backup pump interval use: The controller switches on the backup
pump once a week for a few minutes (Mondays at 9:00-9:05 AM).

The HW overheating alarm stops the pump.

Pumps 1 and 2 are controlled by the controller to function

on alternate weeks as the main pump. The other pump then functions as the
backup pump. The pumps are used alternatively so they both get the same amount
of wear and thus have a longer lifespan. When one pump is in use the other
functions as a backup pump. The changeover is on Mondays at 9.00 AM.

230V actuator:

Time program

The regulator time controls any electric apparatus using the relay, ex. a sauna
stove, door locks.

Timing

programming is done in clock functions (p. 15). In the timing program's "ON"
mode the relay is activated.

You can label the relay according to its use (see p.8).

The control mode can also be changed using a GSM

telephone ( p. 19).

When you have reserved relay 1 for 230V actuator control, the regulator
automatically also reserves relay 2 for 230V actuator control if relay 2 is free. If
relay 2 is not free, the regulator first requests to free relay 2 for 230V actuator
control. After this you can begin using 230VAC 3-point control in the "actuator
selection" mode (see page 23)

Connection information:

Switching the heating resistor on and off:

Relay 2 switches the heating resistor on and off according to the temperat. of
measurement 10. The factory setting at which the heating resistor switches on is
50°C (setting range 5…95°C) and the hysteresis is 5°C (setting range 1…10°C).
The regulator uses relay 2 to control the heating resistor according to the
temperature of measurement 10. The relay is activated (71-72 closed) and the
heating resistor switches on when the temperature drops to the set level. The relay
is released (71-72 open) and the heating resistor switches off at the end of the set
hysteresis. (s hysteresis).

If EH-203 is used for burner control (see p. 26), the regulator can also control the
heating resistor according to the same measurement data (meas. 10). There is a
separate setting for switching on the heating resistor. The heating resistor can be
used as an extra source of heat or the main source of heat depending on whether
the setting is higher or lower than the point at which the burner starts up.
Press the

button and press

OK.

Select

H1 Maint mode

Relay1 control

Pump control

Auto

Off

Pump

Backup pump
HW pump
Alternate pump

2 x 0.8

3 x 1.5 N