13
5
The safety valve drains
water from the
installation, and the
pressure is less than 3
(2,5) bar
The pressure in the
installation is more
than 3 (2,5) bar and
the safety valve does
not drain water from
the installation
Safety valve
failure
Replace safety valve
Safety valve
failure
Replace safety valve
6
Sudden water
temperate increase in
the installation
Air in the
installation
Perform radiator venting
Closed valves
towards radiators
Open all valves in the heating system and provide normal water
circulation in the installation
Circulation pump
failure
The circulation pump should be repaired or replace it thereby allowing
operation of the heating system
Electrical power
loss
You should open all valves that reduced the heating system. This mostly
refers to the “by-pass” valve.
Stop or reduce stoking with strong control so that the water temperature
in the system would not exceed 90
C until electricity arrives.
7
Sudden pressure
increase in the
installation while
water temperature
increase
Decreased
pressure in the
expansion vessel
or completely
empty. Remove
the cover or the
vessel valve cap
and release some
air through the
valve. If the
membrane is
destroyed, water
shall leak from
the valve, and if it
is only half-
empty, only air
will come out
If water is leaking from the valve, replace the expansion vessel.
If only air comes out from the valve, remove the installation vessel and
pump it. The pressure in the vessel must be equal to or greater than
height difference of the highest and lowest installation point. Example:
For height difference of 5m. the pressure is Pmin.
0,5 bar.
Air in the
installation
Perform venting of the installation
8
The circulation pump
does not switch on or
blow a fuse
No power on the
electrical
connection.
Loose
connectors.
Check and tighten the screws at the connection spots. Check and if
necessary, replace the fuses, eliminate the malfunction of the motor or
installation connection
Capacitor failure
Replace the capacitor
Rotor blockage
Before the start of each heating, examine the easy rotor turning. Hot water
deposition may lead to rotor blockage. Turn around the motor shaft with a
wrench until free turning of the rotor is enabled.
The pump is
blocked due to
sediment
Disassemble and clean the pump.
9
The thermometer or
manometer does not
show the amount of
temperature or water
pressure in the
installation
Thermometer or
manometer failure
Replace the thermometer or manometer
10
Noise (sounds) from
the eating system
Defective pump.
Great clearance
between the rotor
shaft and
bushings
Reduce pump speed. Replace the pump envelopes or the entire pump
The pump is
functioning at too
high speed
Select low speed.
Air in installation
Release air from the heating system
