WarmFlow WS18 User manual

Boiler Manual
Wood Pellet Boiler WS18/WP18
For use with ENplus A1 wood pellets only. Look for the ENplus A1 symbol.
Incorporating: User Instructions
Installation Instructions
Service Record
Guarantee Terms & Conditions
Registration Documents
LEAVE THIS MANUAL WITH THE END USER

IMPORTANT – Read this manual in full before installing, commissioning, servicing or
operating this appliance.
COMMISSIONING
This appliance must be commissioned by a Warmflow engineer or other qualified biomass
engineer in accordance with Section 4.1 of this manual. Failure to commission the appliance
will invalidate the warranty.
REGISTRATION
After commissioning, ensure that the appliance registration documents are completed and
returned to Warmflow. See Section 7 of this manual.
SERVICING
To ensure continued reliable operation, fuel economy and to validate the guarantee, the
appliance must be serviced when indicated by the user control interface. Servicing must be
conducted by a Warmflow engineer or other qualified biomass engineer in accordance with
Section 4.2 of this manual. A service history must be maintained in Section 8 of this manual.
NI Customers Only
Warmflow Engineering customer care (NI) provides an excellent back-up service, operating a
team of trained engineers who can meet all the servicing, commissioning and breakdown
requirements for your appliance.
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
Web: www.warmflow.co.uk
For Parts, Service, Technical & Warranty Contact
Great Britain & N. Ireland, Tel: [phone]
Republic of Ireland, Tel: [phone]
LISBURN TELFORD
Lissue Industrial Estate, Moira Road, Unit D1, Hortonpark,
Lisburn, Co. Antrim, N. Ireland, BT28 2RF Hortonwood 7, Telford, TF1 7GX
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
E-mail: [email protected] E-mail: [email protected]
[email protected] [email protected]
[email protected] [email protected]

CONTENTS
1!KEY INFORMATION..............................................................................................................4!
2!USER INSTRUCTIONS .........................................................................................................7!
2.1!Filling the Pellet Hopper................................................................................................................7!
2.2!User Control Interface...................................................................................................................7!
2.2.1!Home Screen Icons and their meaning. .............................................................................................. 8!
2.2.2!Using the Main Menu .......................................................................................................................... 9!
2.3!Cleaning......................................................................................................................................20!
2.3.1!Cleaning Scheduler ........................................................................................................................... 20!
2.3.2!Cleaning Status ................................................................................................................................. 21!
2.3.3!Cleaning Procedure........................................................................................................................... 24!
3!INSTALLATION REQUIREMENTS .....................................................................................38!
3.1!The Clean Air Act 1993 and Smoke Control Areas ....................................................................39!
3.2!General Requirements................................................................................................................40!
3.2.1!Transportation aids and hearth ......................................................................................................... 40!
3.2.2!Service Access.................................................................................................................................. 41!
3.2.3!Heating System ................................................................................................................................. 41!
3.2.4!Air Vents............................................................................................................................................ 42!
3.2.5!Drain Cock......................................................................................................................................... 42!
3.2.6!Pipework............................................................................................................................................ 42!
3.2.7!Heating System Design..................................................................................................................... 42!
3.3!Sealed Systems..........................................................................................................................42!
3.3.1!Expansion Vessel (WS 18 Models only) ........................................................................................... 42!
3.4!System Filling .............................................................................................................................43!
3.4.1!System Filling .................................................................................................................................... 43!
3.4.2!System Pressure (WS 18 only) ......................................................................................................... 43!
3.4.3!Pressure Relief Valve........................................................................................................................ 43!
3.4.4!Low Pressure Switch......................................................................................................................... 43!
3.4.5!Condensate Trap............................................................................................................................... 44!
3.5!Wiring Layout..............................................................................................................................46!
3.6!Flue System................................................................................................................................48!
3.6.1!Flue Outlet Position ........................................................................................................................... 48!
3.6.2!Flue Assembly................................................................................................................................... 50!
3.6.3!Extended Flue Assembly................................................................................................................... 54!
4!COMMISSIONING, SERVICING AND FLUE CLEANING...................................................56!
4.1!Commissioning – Approximate time to complete: 2 hours..........................................................56!
4.2!Servicing .....................................................................................................................................67!
4.3!Flue Cleaning..............................................................................................................................67!
5!ALARMS AND TROUBLESHOOTING................................................................................68!

5.1!Alarms.........................................................................................................................................68!
5.2!Troubleshooting ..........................................................................................................................76!
6!YOUR GUARANTEES, TERMS & CONDITIONS ...............................................................78!
7!APPLIANCE INSTALLATION/COMMISSIONING CERTIFICATE & REGISTRATION......82!
8!APPLIANCE SERVICE RECORDS.....................................................................................85!
9!APPENDIX A – SUPPLEMENTARY INSTALLATION AND OPERATING INSTRUCTIONS
FOR THE UK MARKET..............................................................................................................96!
10!APPENDIX B – CUSTOMER CONNECTION WIRING SCHEMATIC............................104!

4
1 KEY INFORMATION
Wood pellet fuel is loaded into the integrated hopper located at the rear of the appliance (see
Figure 1 above). The pellet hopper door must be kept closed at all times when not refilling.
The combustion door is located behind the green coloured front casing door and has an
interlock fitted to ensure the door cannot be opened during firing of the appliance.
Figure 1: Wood Pellet Boiler Overview.
Pellet hopper
door
Combustion door
Isolator
switch
Flue terminal
Front
casing door

5
The combustion pot is located on the inside of the combustion door and can be removed for
servicing and routine maintenance by releasing the toggle latches on either side of the pot as
shown in Figure 2. Once the toggle latches are released the pot will be free to lift vertically from
the combustion shelf. Caution: never attempt to remove the pot after the appliance has
just finished operating as it will be extremely hot and injury will result.
The ash level in the ash pan should be checked periodically. The ash pan must never be
permitted to over fill. Under normal operating conditions during the heating season the ash pan
will typically require emptying on a monthly basis. The appliance should never be operated
without the ash pan in position. The ash may be discarded with garden waste or in line with
local waste disposal regulations, after first ensuring that it is sufficiently cool before emptying
the pan. Caution: never attempt to remove the ash pan after the appliance has just
finished operating as it will be extremely hot and injury will result.
The combustion pot should be cleaned on a weekly basis removing any carbon residue.
Vacuuming with a dedicated ash vacuum cleaner is recommended. Failure to clean the
combustion pot as directed may restrict the flow of air within the appliance adversely affecting
its performance.
Figure 2: Combustion Door and Ash Pan Assembly.
Ash pan
Combustion pot
Toggle latch
Inspection Door

6
Description
Model
WS18/WP18
Type
Wood Pellet Boiler
Dimensions (mm)
Width
650
Depth
1170
Height
1135
Dry Weight (kg)
250
Minimum Allowable Draft (mbar)
0.04
Flue Pipe Diameter (mm)
80
Exhaust gas temperature at maximum output (⁰C)
170
Exhaust gas temperature at minimum output (⁰C)
65
Exhaust gas mass flow at maximum output
0.015
Exhaust gas mass flow at minimum output
0.005
Electrical Supply
230V Single Phase @50Hz
Maximum Current (Amps)
5
Maximum Wattage
420
Standby Wattage
20
Performance/Efficiency
(kW)/(%)
Maximum Output
18/92.9
Minimum Output
4/90.1
Fuel
Type
Wood Pellets
Quality
ENPlus A1
Maximum Allowable Pressure (bar)
3
Maximum Allowable Flow Temperature (⁰C)
80
Water-side resistance ∆t 10K (mbar)
9
Water-side resistance ∆t 20K (mbar)
4.2
Water Capacity (Litres)
60
Fuel Hopper Capacity (kg)
120
Boiler Class
Efficiency
5
Emissions
5
Combustion Ventilation
@20⁰C for internal Installation
Low Level (mm x mm)
250 x 250
High Level (mm x mm)
250 x 250
Table 1: Product Data

7
2 USER INSTRUCTIONS
2.1 Filling the Pellet Hopper
The wood pellets used to fuel the appliance must be compliant with the ENPlus A1 pellet
standard. Using alternative pellets will invalidate the product warranty and will have a
negative effect on the operation and performance of the appliance.
The wood pellet fuel must be stored in accordance with the wood pellet manufacturer’s
guidelines and in a cool dry area away from sources of ignition, condensation, excess humidity
or other sources of moisture. Whether stored in bags or in bulk it is important that care is taken
to handle the wood pellets in such a way that ensures they won’t deteriorate and create dust.
Care must be taken to avoid exposure of wood pellets to rain or other moisture during storage
or filling. The use of deteriorated pellets will have a negative effect on the operation and
performance of the appliance.
The pellet hopper has a wood pellet capacity of 120kg. The user control interface will indicate
when refilling of the hopper is necessary.
To fill the pellet hopper, open the pellet hopper door (See Figure 1) and pour in the pellets. To
protect the user a hopper safety guard is located in the top of the hopper beneath the pellet
hopper door. This must not be removed. Once filling is complete, close the pellet hopper door.
An interlock switch is fitted below the pellet hopper door meaning the appliance will not operate
if the pellet hopper door has been left open.
NOTE – The appliance will shut down before the pellet hopper runs completely empty. This is to
avoid the auger feed mechanism becoming empty which would cause difficulty during start-up
after the pellet hopper is re-filled.
2.2 User Control Interface
The appliance’s user control interface (see Figure 3) has been designed to maximise the ease
of use and efficiency of the heating system.
All user interactions with the appliance are via the display panel. Hence the display panel
should be mounted at an easily accessible location. The user control interface provides access
to appliance parameters such as temperatures, cleaning alerts, servicing and pellet level
indicators together with commissioning and service settings.
Display active alarms
Select main menu
Previous menu
Select UP
Select DOWN
Enter / select
Figure 3: User Control Interface and Function Keys.

8
2.2.1 Home Screen Icons and their meaning.
The home screen appears as shown in Figure 4.
Boiler Status
Icon
Status
Meaning
Boiler OK
The appliance is functioning normally. There are no faults or alerts. Servicing is not due.
Boiler Alert
The appliance has reached alert condition but will continue to operate as normal. This alert
means that servicing is now due. The servicing time limit can be seen by pressing the
‘Display active alarms’ key. You should arrange servicing as soon as possible and before
servicing is overdue otherwise the appliance will shut down.
Boiler Fault
The appliance has shut down due to a fault or alert. This may be a fault with the appliance,
an overdue service/clean or an empty hopper.
Fuel Status
Icon
Status
Meaning
Fuel Level
OK
The pellet level in the hopper is sufficient. There are no faults or alerts.
Fuel Level
Low
The pellet level in the hopper is low. The appliance will typically operate as normal for 1 hour
dependant on the heat demand of the property. You should fill the hopper within this time.
Filling the hopper will automatically reset this alert.
Fuel Level
Empty
The pellet hopper is now empty. The appliance will shut down. You should fill the hopper
immediately. Filling the hopper will automatically reset this alert.
Cleaning Status
Icon
Status
Meaning
Cleaning
not required
The appliance is functioning normally. There are no faults or alerts. Cleaning is not due.
Cleaning
Due
This alert means the appliance is due for cleaning. The cleaning time limit can be seen by
pressing the display active alarms button. You should clean the appliance as soon as
possible and before cleaning is overdue otherwise the appliance will shut down.
Cleaning
Overdue
Cleaning is now overdue. The appliance will shut down. You should clean the appliance
immediately. Cleaning the appliance will automatically reset this alert and reset the
countdown timer.
Figure 4: Home Screen.
Fuel Status
Boiler Status
Current Page
Cleaning Status

9
2.2.2 Using the Main Menu
The main menu can be accessed by pressing once on the ‘Program key’. This displays
the main menu as shown in the Figures 5 and 6 below.
The ‘Down Arrow’ or the ‘Up Arrow’ key can then be used to scroll through the menu.
Confirm selection with the ‘Enter key’ when the required item is highlighted in black. There
are six options in the main menu including ‘Home’, ‘Alarms’, ‘Cleaning’, ‘Engineer’, ‘Settings’
and ‘Help’.
Home:
Selecting the home menu returns the display to the home screen. This display is as shown in
Figure 7 and detailed in section 2.2.1.
Figure 5: Main Menu Page 1.
Figure 7: Home Screen.
Figure 6: Main Menu Page 2.

10
Alarms:
Selecting the alarms menu enters the alarms display. This can also be entered at any time by
pressing the ‘Display active alarms’ key. The screen shown in Figure 8 will be displayed
when no alarms are present.
When an alarm is present, the ‘Display active alarms’ key will flash red. Pressing the
flashing key or entering the alarm menu will then display one or more active alarms or faults.
The ‘Down Arrow’ or the ‘Up Arrow’ key can then be used to scroll through the alarms.
Refer to Section 5 for more information on the alarm messages that can be displayed and the
appropriate action to take in each case.
Cleaning:
Selecting the cleaning menu option enters the cleaning status display. A typical example of a
cleaning status is shown in Figure 9.
When viewing the cleaning status display, press the ‘Enter’ key to proceed to cleaning the
appliance. The full cleaning procedure detailing the necessary steps to correctly clean the
appliance can be found in Section 2.5.3.
Figure 8: Alarms Screen.
Figure 9: Cleaning Status

11
Settings:
Selecting the settings menu enters a sub-menu which has a number of information and setting
screens. These can be viewed and adjusted by the user. The information and setting screens
are displayed in the same format as the main menu screen and may be accessed in the same
way. The sub-menus include Date/Time, Temperature, Information, Holiday Mode and Vacuum
Feed as shown in Figure 10 below.
Date / Time:
Selecting the date/time sub-menu enters the appliance clock and date management system. It
is very important that the date and time are set correctly as shown in Figure 11.
The date and time are adjusted using the ‘Down Arrow’ or the ‘Up Arrow’ keys. Confirm
with the ‘Enter key’. The day will automatically update when the date is altered.
Temperature:
Selecting the temperature sub-menu enters the screen from which the appliances flow
temperature setpoint may be adjusted. The flow temperature is the temperature at which the
heating system water leaves the appliance and enters the central heating circuit. The flow
temperature setpoint is adjusted using the ‘Down Arrow’ or the ‘Up Arrow’ keys. Confirm
with the ‘Enter key’ as shown in Figure 12.
Figure 10: Settings Menu.
Figure 11: Date/Time Home Screen.
Figure 12: Temperature Screen.

12
Information:
Selecting the information sub-menu allows 3 information screens to be viewed. The first two
information screens display a list of values relating to the operational performance of the
appliance as shown in Figures 13 and 14. These values are for monitoring purposes only and
cannot be altered. A description of the information displayed in Figures 13 and 14 is given in
Tables 2 and 3 respectively, along with expected values that are considered normal.
Text
Description
Expected Value(s)
Clock on
Indicates whether a switched live signal is
being received by the appliance in order to
operate. Usually from an independent time
clock or room thermostat.
“No” – Means there is no switched live signal. The
appliance will not operate unless Freeeze Risk
Mode is enabled. (See Table 5)
“Yes” – Means there is a switched live signal. The
appliance will operate, unless it is already up to
temperature or has an active alarm.
Flue Temp.
The temperature of the flue gases leaving the
appliance displayed in degrees Celsius.
Ambient temperature if the appliance is cold.
No greater than 170⁰C in normal operation.
Flow Temp.
The temperature of the water in the flow pipe
connected to the top of the heat exchanger,
displayed in degrees Celsius.
Ambient temperature if the appliance is cold.
No greater than 85⁰C in normal operation.
Return Temp.
The temperature of the water in the return
pipe connected to the bottom of the heat
exchanger, displayed in degrees Celsius.
Ambient temperature if the appliance is cold.
No greater than 80⁰C in normal operation.
Mode
Indicates the operating mode of the
appliance. The operating mode changes
through start-up, operation and shut down.
(Refer to Table 4)
Standby
System Check
Pre-load
Ignition
Stabilisation
Powerband 1,2,3,4,5
Extinguish
Final Clean
Blocked
Time
Indicates how long the appliance has been
operating in the mode displayed above.
Displayed in hours, minutes and seconds.
The OK status displayed beside the time can
change. (Refer to Table 5)
Any value is possible up to 99h 59m 59s
Resets to 0h 0m 0s every time the operating
mode changes.
Table 2: Description of Information Screen 1
Figure 13: Information Screen (1 of 3).

13
Text
Description
Expected Value(s)
Valve Pos
Indicates the position of the anti-
condensation valve in the appliance.
0% = Valve fully opened = all heat to
property
100% = Valve closed = water circulation in
the heat exchanger (HE) only to raise the HE
temperature and avoid condensation.
90% in Standby Mode by default. This value can
be altered in the Engineer/Parameters menu.
Can modulate between 0 - 100% in all other
modes.
Heat Req.
Indicates the heat demand of the property.
Calculated using the Flow Temp. and Return
Temp. which are continuously monitored by
the control system of the appliance.
Varies between 0% and 100%. Heat Req. will
tend towards 100% if the heat demand of the
property is high i.e. the property is cold. As the
temperature of the property increases, the Heat
Req. value will decrease.
Draught Set
Indicates the draught required to ensure
correct airflow through all modes of
operation, displayed in Pascals (Pa). This
value is pre-set and remains constant for
each mode.
Standby: 50 Pa for the first ½hour then 0Pa
System Check, Pre-load, Ignition
and Stabilisation: 40Pa
Powerbands 1,2,3,4,5: 10 – 15Pa
Extinguish, Final Clean and Blocked: 50Pa
Draught Act
Indicates the actual draught achieved
through the appliance by the exhaust fan,
displayed in Pascals (Pa).
Should match “Draught Set” values ± 10%
Intake Fan
Indicates the speed of the intake fan. This
value is determined by the operating mode
and feedback from the Lambda sensor that
continually monitors oxygen content of
combustion gases.
Usually between 3000 and 8000rpm
Table 3: Description of Information Screen 2
Figure 14: Information Screen (2 of 3).

14
Information screen 3 displays a list of values relating to the software used in the appliance as
shown in Figure 15. The most important of these values is the Software Ver. (meaning software
version). The example in Figure 15 displays the Software Ver. as 4.2.3a. It is beneficial to be
aware of the software version used on the appliance prior to seeking technical support.
Information screen 3 also displays the serial number of the appliance. The serial number cannot
be altered in the information screen shown in Figure 15. Instead, the serial number is configured
in the Engineer/Parameters sub-menu (See Commissioning Step 4 on Page 58). The serial
number displayed in the information screen should always match the serial number marked on
the label on the inside of the front casing door of the appliance.
The operating mode of the appliance varies through start-up, modulation and shut down, and
can be seen changing when viewing information screen 1 (see Figure 13). Further explanation
of each operating mode is given in Table 4.
Mode
Description
Standby
Awaiting heat demand
System Check
Ensuring that the appliance is ready and safe to start – Duration 30 seconds
Pre-Load
Loading the combustion pot with pellets – Duration 2 minutes
Ignition
Igniting the pellets in the combustion pot – Variable duration – usually complete within 1 minute
Stabilisation
Ensuring that the flame is given time to establish – Duration 4 minutes
Powerband
1,2,3,4,5
Output power determined by heat demand – Variable duration
Extinguish
Shut down initiated – Variable duration – usually complete within 2 minutes
Final Clean
Cleaning of combustion pot and heat exchanger – Duration 30 seconds
Blocked
Anti-cycling function that activates a time delay before a restart is possible or the combustion door
can be opened – Duration 2 minutes
Table 4: Appliance Operating Modes.
Figure 15: Information Screen (3 of 3).

15
The appliance has a Start-up sequence as shown in Figure 16. The appliance will remain in
Standby mode if:
1. There is an active alarm – Refer to Section 5
2. Cleaning mode is active – Refer to Section 2.5 “Cleaning”
3. Service mode is active – Refer to the WS18/WP18 Technical Manual
4. The appliance is recovering from a first ignition failure – duration 2 minutes
The appliance will proceed to start-up if:
•None of the 4 conditions listed above are present AND
•Freeze Risk mode is active (Refer to Table 5 on Page 17) AND
•The flow temperature is below trigger temperature (Refer to Table 8 on Page 60)
OR
•None of the 4 conditions listed above are present AND
•Holiday mode is disabled (Refer to Page 18)
•There is a switched live signal e.g. from a timeclock or thermostat
•The flow temperature is below trigger temperature (Refer to Table 8 on Page 60)
Start-up of the appliance begins with System Check mode and proceeds through Preload,
Ignition and Stabilisation modes in accordance with Table 4 on Page 14. On completion of
Stabilisation the appliance will proceed to the Shutdown sequence (Figure 18) if the calculated
heat demand is less than 5%, otherwise the appliance will proceed to the Modulation sequence
(Figure 17) by selecting Powerband 1, Powerband 2 or Powerband 3 depending on the
difference between flow temperature setpoint and the actual flow temperature.
Figure 16: Flow Chart – Start-up Sequence

16
The appliance has a Modulation sequence as shown in Figure 17. The Modulation sequence is
always preceded by the Start-up sequence detailed in Figure 16, which determines the entry
point in the Modulation sequence i.e. Powerband 1, Powerband 2 or Powerband 3 depending
on the difference between flow temperature setpoint and the actual flow temperature. Once the
modulation sequence has been initiated, the control system of the appliance makes powerband
shifts (upshifts or downshifts) accordingly to satisfy the calculated heat requirement as
efficiently as possible. Once the heat requirement has been met the appliance will modulate
down through its power bands and may eventually proceed to the Shut-down sequence detailed
in Figure 18.
The appliance has a Shutdown sequence as shown in Figure 18. The Shutdown sequence can
be preceded by either the Start-up sequence or Modulation sequence detailed in Figures 16
and 17 respectively. Shutdown of the appliance begins with Extinguish mode. The fuel supply is
stopped and the fans continue to operate to burn-off any excess fuel already in the combustion
pot of the appliance. The appliance will proceed to Final Clean and Blocked modes for the
durations listed in Table 4 when the Lux level detected by the photocell drops below 35Lux for
30 seconds. The appliance will enter Standby mode when Blocked mode duration has elapsed.
Figure 17: Flow Chart – Modulation Sequence
Figure 18: Flow Chart – Shutdown Sequence

17
The “OK” status beside the time display on information screen 1 can change (see Figure 13).
Further explanation of what can be displayed in this area on information screen 1 is provided in
Table 5.
Status
Description
OK
The appliance can operate as normal providing there are no active alarms.
PF
Power Failure Recovery - There has been an electrical power failure (power cut) and power has
now been restored. Power Failure Recovery is a feature of the appliance that allows it to recover
quickly to the operating mode it was in prior to the power failure.
NOTE – Turning the isolator switch on the front of the appliance OFF and ON will trigger Power
Failure Recovery unless the appliance is in Standby mode.
FR
Freeze Risk Mode – The water temperature in the return pipe connected to the bottom of the heat
exchanger (Return Temp. on information screen 1) has dropped below 3⁰C. There is now a risk of
damaging the appliance if the water temperature drops any further and begins to freeze. Freeze
Risk Mode is enabled and the appliance will start automatically, even if the time clock or
thermostat controlling the central heating system is not calling for heat i.e. there is no heat
demand. Freeze Risk Mode will be disabled and the appliance will shut down when a Return
Temp. of 30⁰C is achieved.
Freeze Risk Mode is an integral part of the control system in the appliance and cannot be
bypassed. Be aware it is only included to protect the appliance from freeze risk damage, not the
central heating system to which it is connected, including the central heating pipework at the point
of connection at the appliance. The anti-condensation valve of the appliance will remain 100%
closed when Freeze Risk Mode is enabled meaning all heat generated in the heat exchanger of
the appliance will remain in the appliance and will not be distributed through the pipework of the
central heating system.
It is strongly recommended the fuel hopper of the appliance is kept topped up during cold weather
to ensure the appliance can start should Freeze Risk Mode be enabled. The circulating pump will
still operate when Freeze Risk Mode is enabled, even if the fuel hopper is empty and the
appliance is unable to fire, providing some level of freeze risk protection.
It is strongly recommended the central heating system to which the appliance is connected is set
to operate for an appropriate period during cold weather, particularly at night, in order to protect
the whole central heating system from freeze risk.
LF
Limit Flue – The flue gas temperature is approaching a high limit programmed into the control
system of the appliance. The control system will stop the appliance operating in the higher
powerbands in order to reduce the flue gas temperature to an acceptable level.
LS
Low Suction – The actual draught (See Table 4 - Draught Act) achieved through the appliance by
the exhaust fan is approaching a low limit programmed into the control system of the appliance.
The control system will stop the appliance operating in the higher powerbands in order to increase
the actual draught to an acceptable level.
Table 5: Appliance Status.

18
Holiday Mode:
Selecting the Holiday Mode sub-menu enters the screen from which the Holiday Mode function
can be enabled and disabled. The appliance will not operate if Holiday Mode is enabled unless
Freeze risk mode is activated. The Holiday Mode function is disabled by default and the screen
shown in Figure 19 is displayed.
Press the ‘Enter key’ to enable Holiday Mode. The screen shown in Figure 20 is displayed
when Holiday Mode is enabled. Press the ‘Enter key’ again to disable Holiday Mode. The
screen in Figure 19 will be displayed and normal operation of the appliance will resume.
Vacuum Feed:
Vacuum feed systems are used to transfer wood pellets from a remote pellet storage container
to the hopper of the appliance. They usually consist of a pellet silo (typically between 0.5 tonne
and 3.0 tonne capacity), a vacuum unit, a vacuum dispenser, connecting pipework and controls.
The Vacuum Feed sub-menu can only be selected if a Warmflow compatible vacuum feed
system has been correctly installed and configured in the Engineer menu by a Warmflow
engineer or qualified biomass engineer. Contact Warmflow for further details.
Figure 20: Holiday Mode Screen - Enabled
Figure 19: Holiday Mode Screen - Inactive

19
Engineer:
Selecting the engineer menu enters a sub-menu which has a number of information and setting
screens intended for an approved engineer only. For this reason the Engineer utility is
password protected. The password should be entered as shown in Figure 21.
As an authorised Engineer and having entered the password the following sub-menus become
accessible: Parameters, Commissioning, Engineer, Servicing, Working Hours, History, Reset,
Tests, In/Out.
Help:
Selecting the help menu, as shown in Figure 22 below, displays the contact details for
Warmflow who should be contacted if you require further assistance or if you encounter a
problem with your appliance.
Figure 22: Help Screen.
Figure 21: Engineer Pass Screen.