RBI FlexCore CK 3000 User Manual

CONTROL METHODS HeatNet Control V3
Page 33
DHW Method 2: Failsafe Combination DHW and Space Heating with a MASTER
Boiler and Member Boilers Utilizing Valves (Master Type: Combination)
In this example the Master is not a DHW boiler.
Member 2
Cold Water
Makeup
Expansion Tank
Backflow
Prevention
Pressure
Reducing
Ball Valve
Local Pump
Member 3
Master
Domestic Hot
Water
Supply
Make
Up
Dual
Tank Sensor
WM
Water Meter
3-Way
Valve
DHW Valve
DHW Valve
Local Pump
Local Pump
DHW Sensor
System Pump
Heating
Only
Combination
Failsafe
Heating
Combination
Failsafe
DHW
Outdoor Air Sensor
Outdoor Air Sensor
System Return
System Header Sensor
System Return Sensor
System Pump
MIN 3X PIPE DIAMETERS
MAX 10X PIPE DIAMETERS
BETWEEN CENTERS
System Supply
DHW Sensor
3-Way
Valve
System Pump
System Pump
Supply Return Sensor
HeatNet
Supply Header Sensor
HeatNet HeatNet
DHW METHOD 2: Failsafe Combination DHW and Space Heating using a MASTER Boiler and Member boilers with
valves
In this method the Master simultaneously controls both space heating and DHW heating. The Master is piped to only service
space heating, and both members are piped to service space heating and DHW heating. The Master’s Heat Demand input
enables space heating by energizing the system pump and maintaining the Heating Setpoint at the System Header Sensor. The
Master’s OR OVR input enables the DHW heating, by maintaining the DHW Setpoint at the DHW Sensor located in the DHW
tank.
Boilers are staged to meet both the Space Heating Setpoint, and the DHW Setpoint based on their runtime. When a boiler is fired
to service a space heating demand it will enable its local pump, and when a boiler is fired to service a DHW demand it will enable
its local pump and enable its DHW valve to divert water to the tank. The Master modulates the boilers in order to maintain the
setpoints.
This method allows for a Member boiler to provide Failsafe mechanisms in the event the Master fails and stops communicating
to the Members. Member 2 is configured to provide failsafe space heating, and Member 3 is configured to provide both failsafe
space heating and failsafe DHW heating.

RBI FlexCore CK 3000 Specifications

General

Brand	RBI
Model	FlexCore CK 3000
Category	Boiler
Language	English