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Benefit
Description
Setting
Effect
262/348
Siemens Building Technologies
HVAC Products
Input H1
4.255 Function selection input H1
• Changeover of operating mode via telephone (e.g. in a holiday house)
• Minimum heat demand
• Heat generation lock
• Demand for heat
• Checkback contact for solar overtemperature protection
• Solar yield measurement
• Signaling of alarms, errors and faults
Terminal H1 is a multifunctional input.
The function is dependent on the setting made on this operating line.
Setting range
1...14
With this setting, the function of terminal H1 can be changed. The selected function will
be activated by closing a potential-free contact connected to terminal H1 or by deliver-
ing an analog voltage signal DC 0...10 V.
1
Changeover of operating mode (remote telephone switch) for heating circuit and
d.h.w.
The operating mode will change from any mode to standby when input H1 is closed.
2
Changeover of operating mode (remote telephone switch) for heating circuit only
The operating mode will change from any mode to standby when input H1 is closed.
3
Minimum flow temperature setpoint
The "Minimum flow temperature setpoint" (TVHw) set on operating line 871 will be
activated by closing input H1.
4
Heat generation lock oil / gas
The oil- / gas-fired boiler will be locked by closing input H1.
5
Heat demand (DC 0...10 V)
The demand for heat is delivered to the heat sources in the form of a voltage sig-
nal.
6
Error / alarm message
Error message 171 will appear on operating line 50 when input H1 is closed. If the
"Alarm output" is appropriately configured (auxiliary function, operating line 151),
the error will be passed on or displayed by closing an additional contact (e.g. an
external lamp or horn).
7
Green operation
Green operation will be triggered (same effect as the green button) when input H1
is closed. The LED for green operation flashes. The green button is locked.
8
D.h.w. charging priority with wood-fired boiler
When input H1 is closed (e.g. manual switch), the d.h.w. storage tank will first be
fully charged with absolute priority (independent of the d.h.w. button). Only then will
the buffer storage tank be charged.
9
Reserved
With the present line of controllers, this setting has no function.
10 Reserved
With the present line of controllers, this setting has no function.
11 Heat generation lock heat pump
The heat pump will be locked when input H1 is closed.
Basic Documentation RVP540 / RVP550
Description of the heating engineer settings
Unit
–
Factory setting
1
CE1P2488en
18.10.2002
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