HygroMatik DDS20, Руководство пользователя

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Page 48
18. Malfunctions
Problem Possible Cause to do
No steam is coming
out of steam lance
• Defective Hygrostat or humidity
sensor
• Defective Control Valve
• Defective Actuator
• Inaccurate or defective control
• Fouled or blocked coarse strainer in
the filter before separator
• Shut-off valve in steam supply line
is closed.
• Pressure reduction valve, if instal-
led, is out of order.
• Check Hygrostaten and/or
humitiy sensor and repair
or replace as necessary.
• Check valve and clean it
or replace as necessary.
• Measure control signal.
Check, repair or replace
as necessary.
• Check actuator, reset,
repair or replace.
• Remove coarse strainer
and clean or replace.
• Open shut-off valve
• Clean pressure reduction
valve, possibly reset ope-
rational pressure.
Steam is coming
out of steam lance
although desired
humidity value is re-
ached.
• Foreign objects between valve cone
and face prevent valve from closing
properly.
• Defective or falsely set Hygrostat or
humidity sensor .
• Actuator does not close properly.
• Residual condensate evaporates in
the steam lance and exits the lance
as pressureless steam (re-evapora-
tion effect) This process can take up
to 20 minutes.
• Check and clean valve
valve .
• Check humidity or Hygros-
tat and re-set or repair.
• Re-adjust actuator to cont-
rol valve.
• Check out steam supply
pressure for the steam
lance heating system.
Supply steam lance hea-
ting system from a sepa-
rate dry steam steam
reservoir (max. 4 bar).
Condensate is co-
ming out of steam
lance
• Improper steam supply installation
to the humidifier.
• Defective or fouled steam trap eit-
her for separator or steam lance
heating system.
• Back pressure from condensate
network is higher than the operating
steam injection humidifier pres-
sure.
• Check Installation.
• Clean or replace steam
trap.
• Reduce pressure in the
condensate return line.
• If this is not possible, con-
nect steam trap to sepa-
rate return line.