Table of Contents
Advertisement
For proper functioning of this emergency mode, the following settings are necessary in the managing water
heater (installer password required):
- Module Cascade parameter no. 72: "Permit_Emergency_Mode" has to be set on "yes".
- Module Cascade parameter no. 74: "Emergency_Setpoint" has to be set on the right temperature.
- Water heater parameter no. 139: "Dair active" has to be set on "No".
NOTE: do not de-activate the Dair function before commissioning the system and adjusting the heaters!
When the managing unit is reset from lockout state, the cascade controllers are re-initialized.
L
17.5.3
OSS OF CASCADE COMMUNICATION
The burner controller of the managing water heater is aware of how many dependents should be present in the
system. The total number of heaters is stored in the BCU (parameter 147). When powering on the system the
leading water heater has to detect all depending heaters within 60 seconds.
When not all dependent heaters are detected the control will show the CC_Loss_Communication warning. When
the communication with any of the depending heaters 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.
17.5.4
M
ANAGING WATER HEATER ERROR
When the managing water heater is in error mode this boiler is not used anymore for the cascade system.
However depending on the error code, the pumps connected by the managing water heater still can be active for
the cascade system. When the managing unit is reset from lockout state, the cascade controllers are re-initial-
ized.
18 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 water heater can be started without CH or DHW demand 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
Before running the system test modes first check if the heat can be dissipated. Note that during this mode the sup-
ply temperature can be raised above 95 ºC (203 ºF). When this temperature is reached the water heater will
switch OFF. When the supply temperature cools down to 90 ºC (194 ºF) the water heater will start again.
During the system test the water heater and system pump will be ON.
As the water heater 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 han-
dling. When the system test mode is changed during an active system test, the 10-minute timer is restarted.
Description
System test mode not active
The fan is forced to run at maximum speed without starting the water heater
The water heater starts and after the ignition period has finished the water heater
stays at low power
The water heater starts and stays at ignition power
The water heater starts and after the ignition period has finished the water heater stays
at high power
The water heater starts and after the ignition period has finished the water heater 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
E93.1804.014
107
Advertisement
Table of Contents
