12
S1:
CH PROBE
TS:
LIMIT THERMOSTAT
V3V: 3-WAY MOTORIZED VALVE
VM: 2-WAY MOTORIZED VALVE
PR: CH PUMP WITH AIR
PURGING
DEVICE
PS: DHW PUMP
F:
PRIORITY FLOW METER
SE: EXTERNAL PROBE
(OPTIONAL EQUIPMENT)
VMI: MIXING VALVE
TS1: LOW TEMPERATURE ZONE
SAFETY THERMOSTAT
2.3. Boiler layout
Boiler layout BTN E / BTFS E
Boiler layout BTN EV / BTFS EV
pic. 6
DIE-CAST
HEAT
EXCHANGER
BURNER
Plate heat
exchanger
probe
Zone 1 -
high temperature
Thermostatic
valve
DHW
Cold water inlet
Water tank probe
Water tank
VM (2-way)
Cold water inlet
Zone 1 -
high temperature
Zone 2 -
low temperature
Low temperature zone flow probe
Thermostatic
valve
DIE-CAST
HEAT
EXCHANGER
BURNER
W
at
er
s
to
ra
ge
t
an
k
VM (2-way)
W
at
er
st
or
ag
e
pr
ob
e
COLLECTOR
DHW
Plate heat
exchanger
probe
pic. 5D
Model BTFS EV
G: Gas inlet
C: DHW flow
F: Cold water inlet
M: CH flow
R: CH return
M1: Low temperature zone flow
M2: Low temperature zone return
