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16
SYSTEM TEST.
For testing the system at fixed power rates, a system test can be activated via the Installer menu. Via the system
test the boiler can be started without CH or DHW being present. The system test has priority.
The following modes are available:
System test mode
0
Not active
1
Fan only
2
Low power
3
Ignition power
4
High power
5
High power limited
6
High limit error test
7
Low water cut off 1 error test
8
Low water cut off 2 error test
Table 16. 1
Before running the system test modes first check if the heat can also be dissipated. Note that during this mode the
supply temperature can be raised above 203 ºF (95 ºC). When this temperature is reached the boiler will switch
OFF.
When the supply temperature cools down to 194 ºF (90 ºC) the boiler will start again.
During the system test the boiler and system circulator will be ON.
As the boiler will run at fixed power rates there is no setpoint control active.
Also the flame recovery is not active during system test demand. All other safety functions remain active.
The system test automatically stops after 10 minutes, after which the system continues with normal demand
handling. When the system test mode is changed during an active system test, the 10-minute timer is restarted.
Please note that for DHW Mode_7 and DHW Mode_8 the Actual_Flow_Rate must be higher than
Flow_Rate_Start
plus
Flow_Rate_Hyst in order that the board can go into system test.
98
Description
System test mode not active
The fan is forced to run at maximum speed without starting the boiler
The boiler starts and after the ignition period has finished the boiler stays at low power
The boiler starts and stays at ignition power
The boiler starts and after the ignition period has finished the boiler stays at high power
The boiler starts and after the ignition period has finished the boiler stays at high power limited
by the parameter CH_ max_ power
Simulates the Max_Temp_Error
Simulates the LWCO_1_ Error
Simulates the LWCO_2_ Error
E93.1601EN032.C VGH installation manual
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