Eco-King HWB-299, Installation And Service Manual

Page: 95 / 124

E93.1801EN171 HWB installation manual 95
16.2.3 C
ASCADE
– H
EATING ONLY
M
ANAGING WATER HEATER
When a water heater is set as Managing (Address = 1), the controller of this water heater will drive the cascade.
The CH mode of this managing water heater applies to all other water heaters. It is only required to set the CH
mode on the managing water heater.
• The outdoor temperature sensor connected to the managing water heater will be the outdoor sensor for the
cascade operation
• The system sensor (T_System) connected to the managing water heater will be the control sensor for the cas-
cade supply temperature.
• The (modulating) thermostat connected to the managing water heater 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 water heater
calculates a required water heater setpoint, to achieve the requested Cascade_Setpoint.
The managing water heater provides the calculated setpoint to all dependent water heaters. The modulating power
of the dependent water heaters is PID controlled based on the calculated setpoint and dependent water heater
supply temperature.
Cascade HW setpoint adaption
When the system temperature is not high enough the setpoint for all water heaters will be adjusted.
The water heater setpoint will be increased when the system temperature drops below Cascade_Setpoint and
decreased when it rises above Cascade_Setpoint temperature.
Dependent Water heater
The HW mode for the cascade is defined by the setting of the managing water heater. HW mode settings on
dependents are ignored. In case a water heater is set as dependent (Address = 2-8/16) the setpoint is always
provided by the managing water heater.
The modulating power of the ALL water heaters is PID controlled by the water heater itself by comparing the
calculated setpoint from the managing water heater and T_Supply. The managing water heater itself will be con-
trolled in the cascade system as it would as if it was a dependent water heater. Only the pumps and sensor inputs
are used.
Water heater input Rates
A cascade system operates most effective and efficiently when all of the water heaters in the system are the
same size.
16.2.4 C
ASCADE
– D
OMESTIC
H
OT
W
ATER
S
ETTINGS
In the installer DHW menu of the managing water heater control the DHW_Mode should be set.
Available DHW modes in cascade are mode 1 or 2.
Dependent Water heater
In case a water heater is set as dependent (Address = 2-8/16) the DHW setpoint is always provided by the man-
aging water heater, the internal control of the setpoint functions are disabled.
Managing Water heater
If there is a request for a “Store Warm Hold” for the tank and no central heating request the managing water heater
is going to burn for the DHW tank. This (the heating of the DHW tank) is interrupted when there comes a central
heating request and the managing water heater and cascade are burning for the central heating system.
Boiler address Boiler Operation
0 (default)
1
2
3
4
Standalone burner
1
st
boiler (managing)
2
nd
boiler (depending)
3
rd
boiler (depending)
4
th
boiler (depending)
Function of sensor
input terminal 3-4
No function
System sensor
No function
No function
No function
16 16
th
boiler (depending) No function