Armstrong The Brain DRV80 Installation And Operation Manual - Page 10
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Print PageThe DRV 25/40/80 functional overview
The DRV product is a micro-processor-controlled recirculation valve specifically designed to be used in warm water systems.
Hot and cold water is mixed to produce blended water at a setpoint stored in the configuration software of the valve.
In order to do this effectively it has 3 temperature sensors that constantly monitor the hot inlet, cold inlet and outlet (blended)
temperatures. The DRV product is designed to maintain the water temperature automatically at the chosen setpoint however,
for safety; provision is made to generate various alert and error conditions should the outlet temperature fall outside certain
operating parameters:
High / Low Temperature Alerts (DRV 40/80 only)
Should the outlet temperature increase or decrease to outside the setpoint range,
An alert condition will be shown on the DRV 40/80's display. There is also the option to trigger a relay which can be linked
to an auxiliary alarm. The valve will continue to operate normally during an alert condition.
Error Temperature (DRV 25/40/80)
Should the outlet temperature exceed this threshold, an error condition will be shown on the DRV40/80s display or in the
case of the DRV25 the error will be displayed on the mobile application. An error condition will also trigger a relay which
can be linked to an auxiliary alarm. For safety, the DRV product will drive to the full cold position and remain there until the
power is cycled off/on.
Disinfection
The DRV product has a disinfection feature which can be used to run full hot water to all outlets in order to clear bacteria
from the plumbing system (and the outlet fittings as required). To use the disinfection feature, certain parameters must be
defined and set within the DRV products software. For a remote monitoring system (BMS), this involves writing a specific set
of registers in the correct sequence. This is described in the section 'The DRV Product Programming Sequence'.
The RTU format and registers relevant to the
Brain
®
The BMS software will need to be using Modbus RTU (Remote Terminal Unit) format in order to communicate with the
Brain
.
®
Armstrong International
IOM-776
Brain
®
Modbus Networking
Figure 9: Modbus RTU format