Safety Equipment - Wolf MGK-2-390 Installation Instructions Manual

Equipment level to DIN EN 12828
for MGK-2
Note: Provide a drain and fill valve at the lowest system point.
The minimum system pressure is 0.8 bar. The gas condensing boilers are approved exclusively for sealed unvented systems up
to 6 bar (safety assembly accessories 3 bar). The maximum flow temperature is factory-set to 85 °C on the MGK-2 and may be
adjusted to 90 °C if required.
There is no need for a minimum throughput at maximum flow temperatures below 85 °C.
Task
Temperature indicator
(°C)
High limit safety cut-out
(HLSC)
Temperature controller
Low water indicator
Flow limiter
Water level limiter
Pressure measuring
device (bar)
Safety valve
Maximum pressure limiter
Flash trap
Expansion vessel
diaphragm
16

9. Safety equipment

The safety equipment for central heating systems must comply with DIN EN 12828.
This standard applies to all hot water heating systems and heat generation systems
with a maximum operating temperature of 105 °C and a maximum output of 1 MW.
Function
Display
Device to prevent flow
temperature being exceeded
Device to prevent flow
temperature being exceeded
Low water indicator Device to
prevent incorrect heating when
water level or volume flow are
insufficient
Functions like low water
indicator
Functions like low water
indicator
Display
Facility to prevent permissible
operating pressure being
exceeded
Devices for preventing the
permissible operating pressure
being exceeded
Facility to prevent permissible
operating pressure being
exceeded
Device to compensate
for changes in water
volume (external pressure
maintenance)
MGK-2 installation location
Integrated in boiler
Integrated in the boiler,
2nd HLSC integrated in boiler
(eHLSC)
Integrated in boiler and set to
85 °C
In flow line near MGK-2
Not required
Not required
Integrated in boiler
Flow line near heat source
In flow line near MGK-2
2nd maximum pressure limiter
that can be integrated in Wolf
safety assembly (accessory)
Near safety valve or replaced
by 2nd HLSC (already
integrated) and 2nd maximum
pressure limiter
Return line
Comments
Second electronic high
limit safety cut-out already
integrated in boiler
Max. setting 90 °C
Can be substituted by
minimum pressure limiter.
Replaced by
maximum pressure limiter
Replaced by
minimum pressure limiter
Integrated in safety assembly
as accessory
Integrated as accessory (up to
3 bar) in the safety assembly
Two can be installed as
accessories in MGK-2 safety
assembly accessory
Can be replaced by 2nd
maximum pressure limiter and
2nd high limit safety cut-out
Expansion vessels should be
able to be securely isolated
and emptied for maintenance
purposes
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