51
7
Freely selectable inputs and outputs for calorifier control P1/P2
Variable digital input H1 (heating release)
•
Heat exchanger release in heating operation
(P15=0)
Heating operation is released with the activation of
the digital input. If the contact is open the WTC is
blocked for heating operation. Heating circuits which
are controlled via extension module (WCM-EM)
continue to operate.
•
Type of operation Standby for heating operation
(P15 = 3)
If the contact is closed, the WTC and all heating
circuits controlled by WCM-EM/WCM-FS are
driven to Standby operation. In the standby mode of
heating operation frost protection and DHW operation
contiue to be active.
Variable digital input H2 (DHW release)
•
Heat exchanger release in DHW operation
(P17=0
)
DHW operation is released with the activation of the
digital input. If the contact is open the WTC is
blocked for DHW operation.
•
Heating operation with special level
(P17=2)
If the contact is closed the current supply setpoint
switches over to the setpoint defined with parameter
P18. This function is also effective in Summer
operation. Higher setpoints of additional heating
circuits are also considered, DHW operation takes
priority.
•
Lockout function
(P17=3)
This function is intended for the connection of a
underfloor heating thermostat.
If the contact of the thermostat is closed, the unit and
pump switch off, frost protection is not activated. At
the same time warning F24 is displayed.
If the contact opens, the warning automatically
terminates.
•
Liquid Petroleum Gas pre-valve
(P13, P14=0)
As soon as the burner starts due to a heat demand,
the contact is closed. This allows the control of an
additional liquid petroleum gas valve.
This option cannot be used on installations with gas
pressure switch.
•
Lockout and warning transmission
(P13, P14=1)
The contact is open if the installations is operating
without fault. As soon the WCM recognises a warning
which has been present for at least 4 minutes, the
contact is closed. Lockout faults immediately initiate
the switching process.
•
Feeder pump of hydraulic de-couple
(P13, P14=2)
The external pump is controlled in the same way as
an internal heating circuit pump. That means in DHW
operation as well as heating operation.
•
DHW load pump (P13, P14=4)
The external DHW load pump supplies a water heater
after a hydraulic de-couple.
•
DHW circulation pump, controlled by WCM-FS,
The relay contact is closed depending on the switch
times of the circulation program of the WCM-FS.
•
Heating circuit pump, direct pump circuit,
controlled by the heating program of the WCM-FS,
address #1 or #2
Using this programming, it is possible to operate a
pump heating circuit with the pump connected to
output MFA or VA of the heating program of the
WCM-FS. That means the type of operation of the
pump is independent of the boiler pump fitted.
Using the two freely selectable outputs MFA (plug 5) and
VA (plug 6) a multitude of applications can be realised.
The MFA is a potential linked relay output with a
connection
rating of 150 W. The VA output is potential free. Both
outputs can be parameterised for the same functions.
to do this use P13 (for output MFA) and P14
(for output VA).
Summary of Contents for WTC 45-A
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