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Designs, materials, weights and performance ratings
are approximate and subject to change without notice.
Visit
armstrong
international.com for up-to-date information.
Troubleshooting
WARNING! Always use appropriate lockout/tagout procedures when closing
the steam inlet and de-engergizing the DFSI control panel during installation,
service, and repair. Failure to follow safety precautions may result in property
damage, burns and or shock causing personal injury, including electrocution
and death.
WARNING! Always use appropriate personal protective equipment (PPE)
when handling high-voltage electricity.
WARNING! Water conducts electricity. DO NOT stand in water or touch wet
surfaces while working with “live” electrical equipment.
BURN HAZARD! Contact with hot water or metal surfaces can cause severe
skin burns. Skin exposure to 140°F (60°C) water or metal for only five (5)
seconds may cause a second degree burn.
• Prior to performing any invasive procedure, close the steam inlet following
lockout/tagout procedures and allow the heat exchanger to cool. (Always
close steam inlet before closing water inlet!)
• De-energize the DFSI electrical control panel following lockout/tagout
procedures.
• Stop recirculation pump(s), close cold water inlet, and relieve water pressure
before breaking any couplings and joints.
Note: For problems exclusive to the DRV, refer to the DRV IOM.
Generally, performance problems with the DFSI can be categorized under three (3) areas.
1. System faults – performance issues associated w/ steam or water supplies to the heater or the return
lines for mixed water and condensate from the heater.
2. DRV faults / process errors – performance issues associated w/ inappropriate settings, out-of-bounds
operating conditions, or component failures in the digital recirculation valve (DRV).
3. Heat exchanger faults – performance issues associated w/ the heat exchanger, such as fouling,
scaling, or leakage.
Consult the following DFSI Troubleshooting Table for assistance in determining the cause of a
performance problem and suggestions for actions to remedy or alleviate the problem.