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Servicing and spares
Product Name
6 720 ... ... (YYYY/MM)
2.1E
Pump energy saving
mode
The pump is automatically adjusted by
the control system.
• 4: ON - heating systems with
weather-compensated modulate
the pump down. The pump is only
switched on when needed.
• 5: OFF - The flow temperature
controller controls the pump. When
heat is required the pump and
burner are turned on.
Default setting is 5
2.1F
Hydraulic system
configuration
System configuration, allows you to
specify which components in the
heating system. Possible settings are:
0: Central Heating pump and 3-way
valve (internal)
1: Central Heating pump (internal) and
three-way valve (external)
2: Central Heating pump (internal) and
storage tank charging pump (external)
Default is 0 for a System boiler
Default is 2 for a Regular boiler
2.1L
Pump operating
mode
Allows the setup of systems with or
without a low loss header:
0: Pump operates as a heating circuit
pump
1: Pump operates as a boiler circuit
pump
Default is 0
2.2A
Pump blocking time
for an external 3-way
diverter valve
The internal pump is blocked until the
external three-way diverter valve has
reached its end position.
Setting range 0 - 6 × 10 seconds.
Default setting is 0 (seconds).
2.2C
Air purge mode
This feature can be selected to purge
the system and boiler of air.
0 = off,
1 = auto
2 = on continuously
Default is 1
As long as the venting function is
active, the
icon blinks.
2.2d
Thermal disinfection This service feature enables the
heating of hot water at 70 °C. Heating
occurs only while water is drawn.
Possible settings are:
• 0: Thermal disinfection is not active
• 1. Thermal disinfection active basic
setting is 0 (not active)
Thermal disinfection is not displayed
▶ set it back to 0 after thermal
disinfection service function.
2.2H
Hot water system
When connecting a storage tank
temperature sensor to the boiler, the
function must be enabled.
Possible settings are:
• 0: No hot water tank connected
• 8: Hot water tank connected
Default setting is 0
Service function
Possible settings
Table 20 Menu 2
2.2J
Storage priority
Possible settings:
• 0: - Storage priority; the storage
tank is heated to temperature first
and then the boiler switches to
heating mode
• 1: - When heat is required by the
storage tank, the boiler alternates
between heating and hot water
every ten minutes.
Default is 0
2.3b
Anti-fast cycle time
for CH
This sets the amount of time between
stop and starts of the main heat
exchanger burner.
When connecting a weather-
compensated control system, no
adjustment to the unit is required.
The control system optimises this
setting.
Setting range: 3 to 45 minutes.
Default setting is 10 minutes.
2.3C
Anti fast cycle flow
temperature
hysteresis (negative
tolerance only)
This sets the temperature drop before
the burner re-starts, 6 K is the default.
This is used in conjunction with the
Anti fast cycle time.
When connecting a weather-
compensated control system, no
adjustment to the unit is required.
The control system optimises this
setting.
The temperature interval determines
how much the flow temperature must
drop below the desired flow
temperature until the drop is
interpreted as a demand for heat.
It can be set in steps of 1 K.
The temperature interval can be set
from 0 to 30 K.
The default setting is 6 K.
2.4F
Siphon fill program
The siphon fill program ensures that
the condensate siphon is filled after
installation or after the boiler has been
switched off.
The siphon fill program is activated
when:
• the power is turned on
• the burner was not in operation for
at least 28 days
• when the boiler is switched from
summer into winter mode at the
next heat demand.
The siphon fill program remains in
effect for 15 minutes at low heat
output.
Possible settings are:
• 1: siphon fill program with low heat
output
• 0:. Siphon fill program is off (for
service use only)
Default is 1
The
icon blinks, when the siphon
fill program is active.
▶ Set back to 1 after the
maintenance service function.
Service function
Possible settings
Table 20 Menu 2
