16
VÄRMEBARONEN EP31 300
Operation and maintenance
Power connection
The boiler uses binary power increase. By connecting and
disconnecting the three or four power groups, seven or
fifteen stages are obtained. Only fifteen-stage boilers have
power group four. The working method is shown in the table.
Delayed power connection
Power connection can be time restricted after a power cut,
that was longer than three minutes. When the delay is active,
the green indicator on the control panel flashes. Information
may be displayed in the display. The delay can be temporarily
disabled. See the Installation menu.
When the boiler is restarted after a power cut, if necessary
1/3 of the power is connected immediately, 1/3 after
20 minutes and the remainder 40 minutes after the power
has returned.
Quick increase/reduction
For quick increase/reduction, see the Installation menu.
Increase/reduction can be limited by temperature, load guard
or the permitted number of power stages.
Load guard
The load guard protects the main fuses against overload
by reducing the boiler's power. When the overload ceases,
the power is reconnected.
PEC function
The boiler has earth fault measurement, PEC, which indicates
any fault in the immersion heaters at an early stage. This
function can be used to remedy any fault without unplanned
stoppages. The break value for the PEC function can be set.
Safety valves
To maintain the safety function, the heating system's safety
valves must be operated regularly.
Over temperature protection
To supplement the
temperature guard
, the control electronics
has over-temperature protection. The aim of this is to prevent
the
temperature guard
from being tripped where possible.
The protection disconnects all power in the event of a tem-
porary temperature increase that may occur as a result of
reduced flow following a pump stoppage, for example.
Maintenance
After 500 hours of operation, the cable connec-
tions must be tightened with a torque wrench.
Check the power cables' connections every 2 years.
The control voltage is not broken by the load-
break switch. External voltage may occur.
Draining
Always cut the power to the boiler and lock the
switch before the water is drained!
The version of the switch is dependent on the model of boiler
Action in the event of a risk of freezing - frost protection
When it is extremely cold, no part of the heating system must
be switched off as there is a risk of bursting.
If you suspect that any part of the heating system is frozen,
contact an installation engineer.
The boiler must not be in operation if you suspect
that any part of the heating system is frozen.
Call an installation engineer.
If the heating system must be switched off for long periods
the system should be drained, or the heating system water
can be mixed with maximum 30% glycol. When using a glycol
mixture the boiler power is reduced, or the through flow in
the boiler can be increased.
If the heating system's water is mixed with glycol, it is im-
portant to check that the glycol contains a suitable quantity
of corrosion-protection additive. When glycol breaks down,
one of the by-products is carbonic acid, which increases
the risk of corrosion.
