Slant/Fin VHG-100-CH, Installation And Service Manual

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E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
E
MERGENCY MODE
Managing boiler error
When the managing boiler is in error mode, the depending boilers can go into the "Emergency_Mode", if enabled.
In emergency mode the system setpoint is set to the temperature of the Emergency_Setpoint and all cascaded
boilers start burning on this setpoint.
The default setting is 158 °F (70 °C). Make sure the right temperature is set.
Loss of cascade communication
The burner controller of the managing boiler is aware of how many dependents should be present in the system.
The total number of boilers is stored in the e2prom (parameter 147). When starting the system, the leading boiler
has to detect all depending boilers within 60 seconds.
When not, all dependent boilers are detected the control will show the CC_Loss_Communication warning. When
the communication with any of the depending boilers is lost during operation, the control will show the
CC_Loss_Communication warning after 60 seconds, which is purely informative and will not block the control.
Specific Parameters Display menu # Level (Default) Value Range
Emergency_Mode PB 72 User Yes Yes/No
Emergency_Setpoint PB 74 Installer
158 ºF
(70 ºC)
68...194 ºF
(20...90 ºC)
DAir active PB 139 Installer
Yes
Yes/No
For proper functioning of this emergency mode, the following settings are necessary in the managing boiler
(installer password required):
•
Module Cascade parameter no. 72: "Permit_Emergency_Mode" has to be set to "yes".
•
Module Cascade parameter no. 75: "Emergency_Setpoint" has to be set to the right temperature.
•
Boiler parameter no. 139: "Dair active" has to be set to "No".
Do not de-activate the DAir function before the boilers have been
commissioned and adjusted to the correct settings.
When the managing unit is reset from lockout state, the cascade controllers are re-initialized.
M
ANAGING BOILER ERROR
When the managing boiler is in error mode this boiler is not used anymore for the cascade system.
However, depending on the error code, the circulators connected to the managing boiler still can be active for the
cascade system. When the managing unit is reset from lockout state, the cascade controllers are re-initialized.
Table 14.8
NOTICE
NOTICE