Xylem EPR IM Electric heater-circulator unit EPR (obsolete) - Manual (Page 28)

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Instruction manual Laing Electric heater circulator unit
www.lainginc.com
Filling of the system
One has to take care that the whole system is completely filled.
In filling and bleeding of a floor heating system one has to take into con-
sideration that the gases released from the water have no opportunity to
accumulate for instance in radiators as in other heating systems. In a floor
heating the gases will always circulate in the heating loops. In cases with high
emission of gas the circulator may stop running, whereby the bearing, due to
dry running, can be damaged. Therefore one has to take care that after about
two weeks the collected gases are completely vented, and that a comparable
amount of water is added.
The electric heating should only be started after complete filling and blee-
ding of the system.
Pressure and leak tests
When pressure-testing the system, the expansion tank, the pressure relief
valve, and the manometer should never be exposed to the pressure necessary
to perform the pressure test. These parts have to be removed and the holes
have to be plugged.
Starting operation
The system can only be started when it is completely filled and when the
control system has been tested. When using a remote control one has to
make sure that the feed line sensor is attached to the feed line. In addition
one has to take care that the jumper of the control are in the right position to
guarantee the desired functions.
If these preconditions are fulfilled, the pump can be switched on first by
setting the constant temperature at knob K at the lowest value and by acti-
vating the main switch. It is possible that there could be some noise in the
system due to residual air. If this noise does not stop after a few minutes or
if no liquid is circulated by the pump, the pump should be switched on and
off several times (about 10 seconds off, 0 seconds on) to enhance the air
venting. If this method does not succeed after about 10 minutes, the filling of
the system has to be repeated since apparently there is still a large amount
of air in the system.
In no case should the pump run longer than a few minutes in a system
inadequately vented since the bearing can be damaged.
After a successful start of the pump in a floor heating system the unit should
run for about 4 hours without heating to give the water time to get rid of
the gases. After this time the heating should start by slowly increasing the