31
Hoval STU Wood Pellet Boiler
Control Details and Safety Features
Parameters within the Quick Query screen
Boiler Setpoint
(All Levels)
Temperature to which the stoker will modulate.
Boiler Off Setpoint
(All Levels)
Temperature to which the boiler will switch off.
Min. Feed Speed
(Level 4)
Lowest pellet feed rate during modulation.
Max. Feed Speed
(Level 4)
Highest pellet feed rate during modulation.
Wood Quality PB
(Level 4)
This will adjust the rate of modulation on temperature rise.
Trickle Feed Delay
(All Levels)
This indicates if the kindle delay time is on or off (I = On, O = Off).
Trickle Feed Trim
(All Levels)
This indicated if the kindle feed is on or off (I = On, O = Off).
Pellet Feed Speed
(All Levels)
This indicates the current pellet feed rate.
Oxygen Setpoint
(All Levels)
This is the required oxygen content level in the Flue.
FD Demand
(All Levels)
Indicates the demand for the FD Damper to open or close.
Oxygen P-Band
(Level 4)
Used by FD Demand (DO NOT ALTER)
Oxygen I-Action
(Level 4)
Used by FD Demand (DO NOT ALTER)
Oxygen Measurement
(All Levels)
Actual oxygen measurement in the flue.
Boiler Flow Temp
(All Levels)
Actual boiler output flow temperature
Delayed Plant Demand
(All Levels)
Indicates whether the pellet feed time is called to run. (I = On, O = Off).
Delayed ID Fan
(All Levels)
Indicated whether the Boiler Fan is called to run (I = On, O = Off).
Delayed FD Fan
(All Levels)
Indicates whether the Stoker Fan is called to run (I = On, O = Off).
Trickle Feed Rate
(Level 4)
This sets the pellet feed time during kindle.
Altering the Boiler setpoint
•
Select the Quick Query menu option and press 'SET',
•
Select Boiler Setpoint,
•
Press 'SET' to confirm,
•
Turn the wheel to select the required temperature (Requires setting 2
°
C below Boiler Off setpoint),
•
Press 'SET' to confirm then press ESC.
Altering the Boiler Off setpoint
•
Select the Quick Query menu option and press 'SET',
•
Select Boiler Off Setpoint,
•
Press 'SET' to confirm,
•
Turn the wheel to select the required temperature,
•
Press 'SET' to confirm then press ESC.
Actual values
Used by your installer.
Set Points
Used by your installer.
Times
A boiler Management System (B.M.S) will normally control the plant, therefore the time program within the unit is not assigned.
Altering the Unit time
•
Press 'SET',
•
Select the Time menu option and press 'SET',
•
Select Set time of Day,
•
Press 'SET' to confirm,
•
Select time,
•
Press 'SET' to confirm,
•
Turn the wheel to select the required time,
•
Press 'SET' to confirm.
Menu, Control and Configuration
These are menu options used when programming and should only be altered by your installer.
Volt free Contact signals
As standard the following six off, volt free contact signals
are available to the BMS from the boiler control panel:
•
FD fan running (stoker running normally)
•
Stoker tripped
•
Boiler high limit
•
Stoker Isolated
•
Burnback thermostat initiated
•
Low water level in water dump container
(Wiring to the BMS by others)
