Refill Water - Danfoss ECL Comfort 210 Installation Manual

Installation Guide

5.7 Refill water

Leaks on the consumers side will result in falling static pressure and
thereby a poor supply of heating. A refill water function can inject
water to increase the static pressure.
This application can monitor the static pressure and enable the
refill water function when the pressure is too low.
The pressure is measured by means of a pressure transmitter
(giving a 0 - 10 volt signal in relation to the measured pressure) or
a pressure switch.
When a pressure transmitter signal is used, two settings in the
controller represent pressure setpoint and difference.
When a pressure switch signal is used, the setpoint and (maybe)
the switching difference is set on the pressure switch.
When a too low pressure is detected the refill water pump is
switched ON and, after a set time, the ON-OFF valve is activated.
If the pressure is not achieved within a set time, an alarm is
generated. The ECL Comfort controller switches OFF the circulation
pumps after 60 seconds and the control valve closes (a safety
function).
Pressure
Circuit
1
The read-out can be a value (in bar):
• The pressure is measured by means of a pressure transmitter.
The transmitter sends the measured pressure as a 0-10 V or a
4-20 mA signal. The voltage signal can be applied directly to
input S10. A current signal is converted by means of a resistor
to a voltage and then applied to input S10. The measured
voltage on input S10 must be converted to a pressure value by
the controller. This procedure sets up the scaling.
Push the dial to see the graph and enter the value sets for the
input voltage (1 and 10 volt) and displayed pressure (in bar).
Pressure: 0.0 ... 30.0 bar
Fixed voltage settings: 1 V and 10 V
Factory settings: (1.0,0) and (10,20.0)
This means that the 'Pressure' is 0.0 bar at 1 V and 20.0 bar at
10 V.
Typically, the higher the voltage, the higher the displayed
pressure.
Or the read-out can be OFF or ON:
• The pressure is measured by means of a pressure switch. The
pressure switch has an open contact when measuring a too low
pressure (shown as OFF). When measured pressure is OK, the
contact is closed (shown as ON).
The pressure switch contact (potential free) is connected
directly to input S10.
74 DEN-SMT/DK
ECL Comfort 210 / 310, application A231 / A331
Setting range Factory setting
Read-out only
Example: Relationship between input voltage and displayed pressure (in bar)
Bar
30.0
0.0
1
This example shows that 1 volt correspond to 0.0 bar and 10 volt correspond
to 20.0 bar
This scaling menu is always shown, regardless whether a pressure
transmitter or a pressure switch is used.
VI.LG.P1.02
Volt
10
Danfoss District Energy