Wolf SM2 Installation And Operating Instructions Manual page 37

SOL25 / P25
Start temperature,
thermostat function
SOL26 / P26
Stop differential, thermostat
function
SOL27 / P27
Tube collector function
SOL28 / P28
Frost protection function
3062438_0309
Parameter description
The output will be disabled again at a cylinder temperature >
SOL25 / P25 + SOL26 / P26.
In two-cylinder systems, this function is implemented with the
priority cylinder.
With the thermostat function enabled the value at which output A4
is enabled is selected here (see description SOL24 / P24).
With the thermostat function enabled the value at which output A4
is disabled is selected here (see description SOL24 / P24).
To enable the correct collector temperature to be captured when
tube collectors are idle, the medium flows through the collector
array for a short time.
In parameter SOL27 / P27 the following settings are available for
selection:
SOL27 / P27 = 0: Tube collector function disabled
(factory setting)
SOL27 / P27 = 1: Tube collector function via
temperature increase
SOL27 / P27 = 2: Tube collector function over time
Tube collector function via temperature increase:
When the actual collector temperature increases by 2 K, medium
will be pumped through the collector array for 30 s.
Tube collector function over time:
Medium will be pumped through the collector array for 30s every
30 minutes. This function is disabled between 20:00 h and 06:00 h
in Wolf control systems that are equipped with a BM programming
module or in conjunction with a radio clock receiver.
NB:
The tube collector function results in temperatures inside the solar
cylinder that exceed the selected maximum cylinder temperature.
Always ensure that cold water is mixed in with hot water if the tube
collector protection function is active (risk of scalding).
In systems filled with water instead of the heat transfer medium
specific to Wolf, a frost protection function can be enabled
(application in southern countries):
SOL28 / P28 = 1: Frost protection enabled
SOL28 / P28 = 0: Frost protection disabled (factory setting)
With frost protection enabled, medium flows through the collector
array, if the collector temperature falls below 5 °C. This function
remains enabled until the collector temperature has increased again
by 5 K.
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