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Vitotrans 300 Installation, Operating and Service
Select menu
. then press the
Maintenance
button to allow access to
testing and service functions.
To activate the ‘override’ (to test the
outputs) select the
button of the
desired output. Pressing the
will
provide access to the ‘Override’ options,
select the desired function.
The ‘Auto’ indicator will switch from
‘green’ to ‘purple’ (indicating that
function is in the override mode).
When relay testing is complete, select
the ‘purple’ indicator. This will return the
‘Auto’ indicator to green.
Failure to return the ‘Auto’ indicator to
green may cause undesired performance
and/or function(s).
Maintenance Mode / Relay Test
Service
WARNING
Enabling System Demand without adequate flow through
the heating system or boiler may be unsafe. Ensure there is
sufficient flow through the heating system or boiler before
testing System Demand.
The following outputs can be tested and will operate as such:
System Pump 1A
ON or OFF This will turn the primary system pump ON or OFF. When turned ON, the
pump will run at its lowest speed.
System Pump 1A Speed 20 or 80% Once the primary system pump has been turned ON, this will enable the speed
to be manually adjusted to either 20% or 80% modulation.
System Pump 1B
ON or OFF (S3HA/D3HA 90 only) This will turn the secondary system pump ON or OFF.
When turned ON, the pump will run at its lowest speed.
System Pump 1B Speed 20 or 80% (S3HA/D3HA 90 only) Once the secondary system pump has been turned ON,
this will enable the speed to be manually adjusted to either 20% or 80%
modulation.
Descaling Pump
ON or OFF This will turn the internal descaling pump ON or OFF.
Boiler Demand
ON or OFF This will turn the relay (dry contact) for the system or boiler call for heat ON
or OFF.
Tank Loading Pump
ON or OFF This will turn the relay (dry contact) that controls the external tank loading
pump ON or OFF (if installed).
DHW Recirculation
Pump
ON or OFF This will turn the relay (dry contact) that controls the DHW recirculation pump
ON or OFF (if installed).
Outputs are based on Vitotrans 300 model and system configuration.
