IM-P403-89
EMM Issue 8
48
6.4.9 TIMER sub-menu
This timer controls the bottom blowdown intervals and their duration. It can be wired to a
switch box on the blowdown valve actuator to monitor valve operation. An alarm can occur
if the valve fails to close fully or lift off its seat within a certain period. The product cannot,
however, be used to indicate that the valve has opened fully.
The parameters will vary according to the type of boiler. Seek advice from a boiler
manufacturer, insurance company, or a competent water treatment company.
TIMER
DURATION
TIMER
INTERVAL
TIMER
SWITCH
TIMER
CLOSING
TIMER
LIFT
TIMER
RESET
TIMER
MODE
The time the blowdown valve is open for. If = 0, the bottom
blowdown function is disabled.
Will not show if the duration is zero. The time between each
blowdown. 12 hours (default), 00 – 99 hour can be selected in
1 hour steps.
Many boilers are set to blowdown once every 24 hours or once a shift.
Will not show if the duration is zero. Senses whether the valve has
fully closed or not. Select FITTED if a switch box is to be fitted to the
blowdown valve actuator. If a switch box is not fitted, select NONE
(default).
Will not show if the duration is zero. The time the valve takes to close.
Only shows if a switch is fitted. If time elapses an alarm is triggered.
5 (default), 1 – 10 seconds, 1 – second steps.
Will not show if the duration is zero. Only shows if a valve is fitted.
Time to lift the valve off the seat. If time elapses, an alarm is triggered.
5 (default), 1 – 10 seconds, 1 – second steps.
Will not show if the duration is zero. Press the
OK
button to reset
the elapsed duration or interval times and any alarms related to the
bottom blowdown feature.
Will not show if the duration is zero.
OFF:
Blowdown is prevented on this boiler.
OPEN:
The blowdown valve on this boiler is held open, for example
to drain a cold boiler. An alarm will be triggered while open
is selected.
AUTO:
Automatic timed blowdown. Pressing
OK
will select the mode.
The selected mode will flash
WARNING:
This product will remain in the mode selected in both run and commissioning
mode. If left in OPEN mode, the boiler could empty sufficiently to cause dangerously low
water level. An excessively long blowdown time can cause the boiler water level to become
dangerously low.
Summary of Contents for BC3250
Page 76: ...IM P403 89 EMM Issue 8 76...
