Function Description - Viessmann SM1 Installation And Service Instructions Manual

Solar Control Module SM1, Installation and Service

Function Description

Note: Set or alter the functions described below in coding
levels 1 and 2 (solar group) at the boiler control unit.
Refer to the boiler Service Instructions
Reduction of stagnation time
If there is excess solar energy, the speed of the solar
circuit pump will be reduced before the maximum
DHW tank temperature is reached. This increases the
difference between collector temperature and DHW tank
temperature. The heat transfer to the DHW tank
is reduced, which delays stagnation.
Coding address 0A.
Maximum collector temperature
If the maximum collector temperature is exceeded,
the solar circuit pump is shut down to protect the system
components (emergency collector shutdown).
Coding address 09.
Minimum collector temperature limit
If the actual temperature falls below the minimum
collector temperature, the solar circuit pump is shut
down.
Coding address 12.
Interval function
Activate the interval function in systems where the
collector temperature sensor is not in an ideal location
to prevent a time delay in capturing the collector
temperature.
Coding address 07.
Collector frost protection function
Viessmann collectors are filled with Viessmann heat
transfer medium. This function does not have to be
enabled.
Activate only when using water as heat transfer medium.
With a collector temperature below 41° F (5 ºC), the
solar circuit pump will be started to avoid damage to the
collectors.
The pump will be stopped when a temperature of 45° F
(7 º C) has been reached.
Coding address 0b.
Thermostat function
The thermostat function can be used independently
of the solar operation.
Different effects can be achieved by determining the
thermostat start and stop temperatures:
H Start temperature < stop temperature: e.g. reheating
H Start temperature > stop temperature: e.g. utilisation
of excess heat
Coding addresses 20, 24, 25.
Speed control
The speed control is disabled in the Factory set condition.
It can only be enabled for relay output sF.
Possible pumps:
H Standard solar pumps with and without their own speed
control
H High efficiency pumps
H Pumps with PWM input (only use solar pumps)
E.g. Grundfos Solar PM 15 - 85
Coding addresses 02 to 06.
Note: We recommend operating the solar circuit pump at
max. output while the solar thermal system is being
vented.
Heat statement
When determining thermal yields, the difference between
the collector and DHW tank temperature, the set
throughput, the type of heat transfer medium and the
operating time of the solar circuit pump are taken into
account.
Coding addresses 0E and 0F.
Additional Information
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