Armstrong BRAIN DMC80 - Blend Temperature Rises When System Is in Zero Demand; Common Faults

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Armstrong International
Parc Industriel Des Hants-Sarts, 2ème Avenue No. 4, Haerstal, B-4040, Belgium
armstronginternational.com/brain
Common Faults
H C
Problem: “Blend temperature rises when system is in zero demand...”
Check blend circuit ow rate.
Flow rate is less than 38 l/m. Reset circuit ow
rate and check for the following:
• Air locks
• Blocked strainers
• Closed valves
• Pump failure
Water pressure
Make sure supply pressures are balanced.
Make sure mixed return is owing correctly to
hot water supply inlet.
Checkvalves
Check circuit to make sure checkvalves are
correct positioned and operating normally.
(See Piping Diagrams on pages 12-15)
Check mixed return temperature.
Minimum recirculation loop temperature loss
= 1°C
DRV80 display errors
These are the most likely error messages
to be displayed during this problem. For
the most probable causes and solutions
see DRV80 Display Errors on page 60.
If any other error message is displayed see DRV80 Display Errors on pages 59-61.
Return to Hot
Water Supply Inlet
Temp 49˚C
Error Temp 3
Temp 49˚C
Error Temp 7