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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
Minimum limitation of the return temperature
5.12 Minimum limitation of the boiler return
temperature EXP
•
Prevents minimum limitation of the return temperature to be set to too low a value
(boiler protection).
Minimum limitation of the boiler return temperature, which can be set on operating line
252, can be adjusted by the EXP.
The user on the heating engineer level is no longer able to set minimum limitation of the
boiler return temperature to a level below the minimum temperature required for the
specific boiler.
Setting range
Unit
Factory setting
8…line 252
°C
8
Minimum limitation of the return temperature with bypass pump (operating line 283
EXP
)
or mixing valve, as well as the impact on the consumers (operating line 281
EXP
) adopt
this setting as the setpoint and attempt to maintain it. The type of actions triggered for
that depends on the settings made in connection with these functions and the selected
oil / gas partial diagram.
“Minimum limitation of the boiler temperature Tkmin” (operating line 270) must be set to
a level above the “Setpoint of minimum limitation of the return temperature” adjusted on
this operating line.
Boiler operating mode “Automatic with extended burner running time” (operating line
257
EXP
, setting 2) may not be selected.
5.13 Maintained boiler return temperature with
impact on the consumers
•
Maintained boiler return temperature with adjustable impact on the consumers
You can choose whether the maintained boiler return temperature shall have an effect
on the consumers.
Setting range
Unit
Factory setting
0 / 1
–
1
The settings have the following meaning:
0
Maintained boiler return temperature does not affect the consumers.
1
Maintained boiler return temperature affects the consumers.
The action is comparable with that of the protective boiler startup (operating line
259
EXP
). But in place of TKmin, the value of operating line 252
will then be used.
Benefit
Description
Setting
Effect
Notes
Benefit
Description
Setting
Effect
