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Armstrong International
Parc Industriel Des Hants-Sarts, 2ème Avenue No. 4, Haerstal, B-4040, Belgium
armstronginternational.com/brain
System Performance
For effective DRV40 performance, the DRV must be able to experience a minimum ow and a minimum
temperature differential between its inlet and outlet supplies when the system is in zero demand.
Zero demand is dened as periods when there is no mixed water outlet usage on the system.
Pre-installation calculations should have already determined the system heat loss characteristics. For optimum
performance the DRV40 requires a minimum of 1°C differential between the digital display on the unit (the outlet
temperature) and the thermometer which is installed on the system return line.
When there is no system draw-off, the DRV40 reverts to a zero demand. The recirculation temperature
is continuously monitored and adjusted appropriately by the DRV40. The circulating pump must operate
continuously, the DRV40 requires a minimum ow of 19 l/m.
Pump Capacity
The circulating pump is only required to keep water gently moving around the system. The pump should be
sized and selected to overcome the system resistance (feet of head) at the minimum specied ow rate of
19 l/m while also accounting for system heat loss.
System Safety Measures
System safety measures such as the installation of an aquastat linked to the circulating pump which shuts the
pump off if the system exceeds a given temperature setpoint is not required. DRV40 can be programmed to
issue suitable alerts and / or system hot water shutoffs (DRV40) and shutdowns (Independent Solenoid Valve).
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