17
5.8
Expansion vessel
The expansion vessel installed on the boilers has the following
characteristics:
Description
U/M
Murelle Advanced HE
ErP
30
40
Total capacity
l
9,0
10,0
Prefilling pressure
kPa
100
bar
1,0
Useful capacity
l
5,0
6,0
Maximum system content (*)
l
124
140
(*) Conditions of:
Average maximum temperature of the system 85°C
Start temperature at system filling 10°C.
m
CAUTION
– For systems with water content exceeding the
maximum system content (as indicated in the
table) an additional expansion vessel must be
fitted.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 metres,
increase the prefilling pressure of the expansion
vessel and the system when cold by 0.1 bar for
each meter increase.
5.9
Circulation pump
The flow-head performance curve available for the heating
system is shown in the graph below.
RESIDUAL HEAD (mbar)
0
0
800
1000
1200
600
400
200
100
200
300
400
500
600
HE 30
HE 40
FLOW (l/h)
Fig. 7
m
CAUTION
The appliance is equipped with a by-pass which
ensures water circulation in the boiler when
thermostatic valves are used in the system. The
heating system design should incorporate a room
thermostat. Thermostatic radiator valves fitted
to all radiators except the room where the room
thermostat is fitted. Properties with floor areas
exceeding 150squre metres should be zoned.
5.9.1 Pump equipped with LED
LED
Fig. 8
Murelle Advanced HE 40 ErP
boilers use the pump equipped
with LED warning lights which indicate:
LED colour
Status
Trouble-shooting
Off
No electrical power
Green
Permanently on Normal operation
Red/Green
Flashing
Transient safety shutdown
Anomaly in progress
Red
Flashing
Safety shutdown
Permanent anomaly
For the "Any pump faults and possible solutions" see the
relevant section at the end of the manual.
