Setting The Boiler Address; E2Prom Address Selection Through E2Prom Setting; Cascade - Heating Only Managing Boiler - Slant/Fin VGH-299-CH Installation And Service Manual

15.2.1 S
ETTING THE BOILER ADDRESS
NOTICE
The cascade managing address (parameter 184) must be set to 'Managing' on the managing boiler.
The cascade depending addresses (parameter 184) must be set in a logical numbered order from 1: Dep. 1,
Dep. 2 etc. on the depending boilers.
The total number of boilers in the cascade must be stored in parameter 147 on the managing boiler.
When the number of boilers is set to 4, the first three depending controls are expected to be available for the
cascade. In this case depending controls 1, 2 and 3 must be selected. When any of these 3 are not present
on the communication bus the managing control detects the loss of a depending control and generates the
warning: "Comm. Lost with module."
The managing boiler of the cascade system is connected to the AL-BUS connection on terminals 20-21
This connection also provides the power for the communication bus. The depending boilers are all parallel
connected to the managing boiler communication bus.
The bus power is provided by the managing boiler on terminals 20-21, switch S1 must be set in the OFF position
(all controls).
J11
OFF
Figure 15. 3
15.2.2 E2
PROM ADDRESS SELECTION THROUGH E
This setting can be changed on the boiler control.
Boiler address Boiler Operation
0 (default) Standalone burner
1 1 boiler (managing)
st
2 2 nd boiler (depending)
3 3 rd boiler (depending)
4 4 th boiler (depending)
16 boiler (depending)
th
16
Table 15-1
15.2.3 C – H
ASCADE EATING ONLY
When a boiler is set as Managing (Address = 1), the controller of this boiler will drive the cascade. The CH mode
of this managing boiler applies to all other boilers. It is only required to set the CH mode on the managing boiler.
• The outdoor temperature sensor connected to the managing boiler will be the outdoor sensor for the cascade
operation
• The system sensor (T_System) connected to the managing boiler will be the control sensor for the cascade
supply temperature.
• The (modulating) thermostat connected to the managing boiler will be the CH heat demand input for the cascade
system.
Based on the system temperature (T_System) and the requested Cascade_Setpoint the managing boiler
calculates a required boiler setpoint, to achieve the requested Cascade_Setpoint.
The managing boiler provides the calculated setpoint to all dependent boilers. The modulating power of the
dependent boilers is PID controlled based on the calculated setpoint and dependent boiler supply temperature.
94
Address rules
The boiler address can be set through an e2prom setting or
J8
via the Switch input available on the control. Each boiler must
be configured with its own unique address.
ON
2
PROM SETTING
Function of sensor input terminal 3-4
No function
System sensor
No function
No function
No function
No function
M
ANAGING BOILER
E93.1601EN032.C VGH installation manual
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