AUTOFLAME Mk8 MM User Manual

12 Bottom Blowdown
Mk8 MM Manual Page | 230
12.5 Set-up
For a new installation, after checking the wiring, performing safety installation checks, and settings the
options, parameters and expansion options, the servomotor closed position can be set in password
protected Commissioning Mode or Online Changes for an already commissioned system.
When the bottom blowdown module is used as standalone, it must be configured using the bottom blowdown
configurator PC software. Please see the Autoflame PC Software Guide for more information.
The battery connectors on the bottom blowdown module must remain disconnected during the
commissioning of bottom blowdown, these can be reconnected after the commissioning process is
completed.
12.5.1 Bottom Blowdown Settings
The bottom blowdown function can be set using an external solenoid valve or the bottom blowdown module,
see expansion option 60.
When a bottom blowdown time is due, the blowdown can be set to occur automatically, or by a pressing the
manual trigger on the bottom blowdown screen, see expansion 61.
Bottom blowdown reduction allows the timing of the blowdown to be adjusted according to the steam
production, see expansion option 62.
If there is no steam production when a blowdown time is due, the MM/module will ignore the blowdown or
blow down the valve for a minimum duration, see expansion option 63.
If using bottom blowdown reduction, the boiler steam production rating must be set and the fuel flow
metering must be set and commissioned, see expansion option 64 and option 57.
The industrial UNIC servomotors which are used with the water valve for bottom blowdown are factory set
with the closed position at 0.0° and open position at 90.0°.
However please do physically check the servo position manually and also check the potentiometer reading
on the servo, this should read 0V at closed position. Please refer to section 3.3 for servomotor checks and
adjustments.
The default parked position is set the same as the closed position 0.0°, however this can be adjusted using
the Bottom Blowdown Board Configurator software; refer to the PC Software Guide. The parked position is a
near closed position. During a bottom blowdown event, the servomotor will move to the parked position
rather than the closed position during the valve closed interval. This allows a not fully closed position to be
set for the parked position, reducing the time take for the servomotor to drive to 90.0
O
for the valve open
interval.
The table below shows a summary of the bottom blowdown expansion options.
Expansion Option
Description
60
Bottom blowdown function
61
Bottom blowdown triggering
62
Bottom blowdown reduction
63
Minimum blowdown duration
64
Boiler steam production rating

AUTOFLAME Mk8 MM Specifications

General

Brand	AUTOFLAME
Model	Mk8 MM
Category	Controller
Language	English