Wood master LT 90 User manual

Outdoor Wood Fired
Hydronic HEater
LT 90
LT SERIES OWNERS MANUAL
Retain this manual
Northwest Manufacturing, Inc / 600 Polk Ave SW / Red Lake Falls, MN 56750
www.woodmaster.com / 800-932-3629 / Manual PN: 7994-590
Rev: 3.1

2LT 90 Owners Manual 2015
Safety.................................................................................... 3
Fuel ....................................................................................... 4
Features ................................................................................ 5
Installaon ....................................................................... 6-10
Operaon....................................................................... 11-12
E.T.C. Reference .............................................................. 13-19
Maintenance .................................................................. 20-21
Wiring Diagram .............................................................. 22-23
Troubleshoong .................................................................. 24
Warranty ........................................................................ 25-28
Specicaons ...................................................................... 29
Notes ............................................................................. 30-31
Thank you for purchasing a quality
wood furnace from WoodMaster.
This product was designed to de-
liver easy, trouble free operaon
for years to come. Check out other
WoodMaster heang products at
www.woodmaster.com, or our line
of quality pellet grills at
www.woodmasterpelletgrills.com.
Table of
Contents

3
LT 90 Owners Manual
2015
• Read and follow these direcons carefully. Retain this manual for as long as you own your LT 90.
• All installaon and operaons must follow STATE and LOCAL CODES for wiring, and ring of this
unit. These CODES may dier from this manual. Installaon must be performed by a qualied installer.
• Follow the manual carefully. Follow the recommended cleaning and maintenance.
• The WoodMaster LT 90 is designed to be operated in a open system. Make sure all necessary
safety components are installed and funconing properly. DO NOT pressurize the LT 90.
• Freeze protecon must be guaranteed in all water-bearing parts in the event of extensive idle
periods of the system. Note: Your WoodMaster LT 90 is not intended to be your only heat source.
• Boiler water treatment must be used to ensure proper water quality.
• The chimney height may need to be adjusted depending on the installaon and local codes. Do not connect
this unit to a chimney ue serving another appliance. Follow all state/local codes.
• Never open the tube access door during operaon!
• Never operate any part of the system with covers, shields or panels removed.
• Anyone who is not familiar with and/or has not been trained to operate the LT 90 may not
operate the system. Only responsible adults should operate your LT 90. If the LT 90 is not red
properly, damage could result and the warranty may be voided.
• Never allow children to play near or tamper with the Furnace, fuels or any other part of the system.
• Always keep the area around, and in front of the system clean and free from combusble materials.
• Keep animals away from the system.
• The operaon may not be connued or restarted in the event of visible damages (for example,
thermal distoron, traces of smoke or re, mechanical damages, etc.). Any damages must be repaired.
In the event of any doubts, please contact your authorized WoodMaster dealer.
• The system must not be exposed to external mechanical stress (for example, as storage, climbing
support, brace, or similar). This also applies for single parts (doors, covers, etc.).
• Only touch the E.T.C. and door handle during the operaon. Temperatures at other points (for example,
chimney, tube access box & door, water lines…) can be very high.
• The WoodMaster LT 90 must be operated exclusively according to the guidelines for planning,
assembly, regulaons, statutes and product related instrucons. The manufacturer is not liable for
damages and their results, if they occurred due to improper assembly, operaon, applicaon and also
inadequate maintenance and cleaning.
• Disconnect all electrical power to the LT 90 before performing any service.
• The water pump must run connuously whenever the WoodMaster LT 90 is being used.
Safety

4LT 90 Owners Manual 2015
Safety
Fuel
• Never shut power o to the LT90 if there is a re and fuel in the rebox unless there is an emergency.
• Take the proper precauons to ensure that the modicaons made to an exisng heang system does not
interfere with exisng safety controls.
• Never use the following: trash, plascs, gasoline, rubber, or naphtha in your WoodMaster LT 90.
• Read and follow these direcons carefully. Retain this manual for as long as you own your LT 90.
Sweeping
The chimney should be inspected and cleaned as needed, typically twice a year. This is to be done by qualied
persons. Shut o the furnace, disconnect power and allow the system to cool before aempng to clean the
system.
Warning!
Always disconnect the power to the furnace before any cleaning or maintenance. Service agreements increas-
es operaon length and life of the unit. For more informaon contact your local WoodMaster dealer.
Replacement parts should only be genuine Northwest Manufacturing, Inc. components. Your dealer can supply
the genuine service parts and install them.
All fuels must conform to certain quality standards to ensure trouble free operaon of the furnace. Use
of unapproved fuels may result in faulty operaon and a voided warranty. Never use the following: trash,
household garbage, plascs, gasoline, rubber, naphtha, leaves, and materials treated with petroleum prod-
ucts (ie: parcleboard, railroad es & pressure treated wood). Newspaper and plain, unprinted cardboard
should only be used as kindling, not as fuel. Other paper products should not be used. Please contact your
WoodMaster dealer for any quesons on fuel use.
Only cut, split, seasoned wood with a internal moisture content of 25% or less may be used. Wood can be cut
to a maximum length of 27 inches. The wood should always be placed horizontally and parallel to the rebox
wall. The pieces of wood should be stacked as ghtly as possible whereby the face of the wood should NOT
touch the rebox wall. This ensures proper air ow. DO NOT burn any large, round pieces of wood. DO NOT
burn any “green wood”, or any wood that is above the 25% moisture limit.
Water Content
The maximum permied water content is 25%.
Bark Content
The maximum permied bark content is 20%.

5
LT 90 Owners Manual
2015
Front View
Rear Panel
Hanger Strap
Night
Light
Safety Sckers
Fuel
Door
Stainless Steel Chim-
ney
Vent Cap
E.T.C.
Panel
Maintenance
Schedule
Serial/Model
Numbers
Primary Return
(Cold)
Water Temp Snap
Disc
Thermistor
Probe
Primary Supply
(Hot)
Drain
Dra Inducer
Heat Exchanger
Clean Out
Secondary Return
(Cold)
Solenoid
Combuson
Fan
Secondary Supply
(Hot)
Features

6LT 90 Owners Manual 2015
Choosing Locaon
When installing your WoodMaster, keep in mind the direcon of the winds during heang months. Try to place
the furnace in an area where exhaust will not be a problem for yourself or any surrounding neighbors.
LOCATION: It is recommended that the unit be located with due consideraon to the prevailing wind direcon.
• When using more that 4 feet of chimney extension external support is needed.
• Should be located greater than 100 feet from any residence not served.
• If located between 100 and 300 feet to any residence not served, it is recommended that the
stack be at least 100% of the height of the peak of the residence, plus an addional 2 feet.
Always remember to comply with all applicable state and local codes.
Chimney Specicaons
To insure proper insulaon, use only a Class A Insulated Chimney and Chimney Adapter from your local Wood-
Master Dealer or Northwest Manufacturing, Inc. A dra inducer may be used to ensure proper dra under all
condions. Note: Remove the chimney cap prior to lighng the furnace. CAUTION: Using a non-insulated chim-
ney or failure to use a Class A Insulated Chimney WILL result in a voided Warranty. When using more than
four feet of chimney extension external support is needed.
Pad Supports
The LT 90 should be placed on cement
blocks. The blocks should be at least 6”
wide, 10” long and 3” thick. Two feet of
clearance from the front and rear of the fur-
nace and at least one foot clearance on the
sides is recommended. Failure to install the
WoodMaster LT 90 on a proper support will
result in a voided warranty. Never use com-
bustable materials, such as wood blocks,
to support the LT 90. A full cement pad is
recommended if the supporng ground is
so, sandy, or othewise unable to support
the furnace on the pads alone.
Residence not
served by furnace
2 feet
Residence
served by furnaceMinimum of 100 feet
Chimney height
should be 2 feet above roof line
60.00
96.00
54.00
6.00
6.00
16.00
16.00
12.00
12.00
11.50
48.00
14.00
14.00
F
FF
F
SUP
SUP
RET
RET
Installation

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LT 90 Owners Manual
2015
Trench
The trench must be 24 inches deep and 6 to 12 inches wide. It can be dug with a shovel or a backhoe. Place all
the dirt to one side of the trench to allow room for working on the other side.
Wiring
Place electrical supply in boom of trench and cover with 6 inches of dirt. Electrical wire rated for under-
ground use (14-2 +ground) can be buried in the same trench as the water lines but must maintain a minimum
24 inch depth. Always follow state and local codes.
Water Lines
The remaining 18 inches of open trench is where the water lines are placed. Use only water line approved by
Northwest Manufacturing through your Woodmaster Dealer.
NOTE: If lines travel under a driveway or where heavy equipment travels, the line should be buried two to
three feet deep. If lines travel through a low or wet area, they should be insulated and installed in a water ght
piping, (PVC).
Note: Leave a minimum of three feet of water line exposed above ground at the furnace to
insure adequate length for connecon.
Note: Before insulang and burying the water lines, label the hot water supply line at both ends. Once the
lines are covered you will be able to easily determine which line is connected to the pump.
Note: Use only approved water line insulaon sold through your WoodMaster Dealer. Poor insulaon will
cause your Wood Master furnace to burn large amounts of fuel, and hurt the eciency of the system. For
best results use high quality insulaon.
Note: Remove the chimney cap before ring your LT 45. Replace the Chimney cap when the furnace is o for
extended periods.
Note: Check the rebox and remove any accessories that are included with the LT 45 before starng the
furnace.
Installation

8LT 90 Owners Manual 2015
1” Cast Iron Pump Flange
Pump
Black Rubber Gasket
(Supplied with pump)
Hot Water Supply Va lve
Black Rubber Gasket
(Supplied with pump)
Hot Water Supply
(On back of furnace)
Direction of Flow
Indicator Arrow
1” Pex Crimp x 1” MIP
(0020-140)
1” Pex Water Line
(0020-130)
1” Pex Crimp Ring
(0020-145)
Hot Water
Supply Valves
Cold Water
Return Valves
Drain
Mounng the Pump
Note: The pump must be located on the furnace.
The pump ange valve comes pre installed on the supply
line.
Locate one of the black rubber gaskets, and place it be-
tween the pump and the mounted ange valve, bolt the
pump to the ange. Make sure the arrow on the pump
indicang direcon of water ow points down.
Bolt a 1” cast iron pump ange and gasket to the boom of
the Pump.
Note: Make sure that the pump is aached to the supply
line, not the return.
Note: A pump that has a ow rate of 10-12 GPM
is recommended
Hooking Up Water Lines
Water Supply
Aach the 1” Pex x 1” MIP ng (0020-140) to the ange
on boom of the pump. Then aach the hot water supply
1” Pex Water Line (0020-130) to the ng using 1” Pex
Crimp Ring (0020-145).
Water Return
Aach the 1” Pex x 1” MIP (0020-140) ng to the Water
Return Valve. Then aach the cold water return 1” Pex Wa-
ter Line (0020-130) to the ng using 1” Pex Crimp Ring
(0020-145).
Wiring The Pump
Remove the cover on the pump. Then using an approved wire, connect the ground wire to the green ground
screw on the pump. Connect the black wire to the yellow wire on the pump. Finally, connect the remaining two
white wires together and replace the pump cover.
Locate the juncon box in the back of furnace and remove the cover. Connect the running end of the approved
wire coming from the Pump to the Juncon.
Note: The wires from the pump will have to connect with the main power wires in the juncon box.
Note: The pump must run connuously whenever the WoodMaster Furnace is in use. DO NOT run the
pump dry.
Note: All wiring must follow state and local codes and should be done by a qualied electrician. Disconnect
power before servicing any electrical components.
This is an example of an installaon using a Taco pump. Your
layout may vary, but the pump must be on the supply line.
Installation

9
LT 90 Owners Manual
2015
Entering the building with water lines can be done underground or over the sill plate. Once inside the building
the typical hookup would run rst to the Domesc Hot Water Supply and next to an exisng heang system
such as a forced air furnace or a hot water heang system. Finally, before leaving the building, a ll valve must
be installed near a water supply for lling and ushing the boiler in the WoodMaster Furnace.
Domesc Hot Water
The Domesc Hot Water/Flat plate Kit consists of a Wa-
ter to Water Heat Transfer unit and the ngs needed
to hook it up. The unit mounts on the wall VERTICALLY
in your ulity room and is connected as shown.
Exisng Forced Air
A water to air heat exchanger is inserted in the exisng
plenum. In most cases the heat exchanger is placed in
a horizontal posion, keeping all four sides level. The
air must be forced through the nned area of the heat
exchanger evenly. The hot water line coming from the
hot-water tube enters the boom ng of the heat
exchanger and exits the top ng, which returns to
the furnace. If the plenum is too large or too small, it
must be altered to t the heat exchanger properly.
Note: The water to air heat exchanger must be in-
stalled below any exisng o-peak electric coils
already in the plenum.
Aer the installaon of the WoodMaster add-on water
to air exchanger, the air ow may need to be increased
to fuel furnaces, electric furnaces, and electric/gas
furnaces. Methods of doing this are:
Belt Drive System
Blower pulleys and motor pulleys may be changed but
the electric current owing through the motor shall not
exceed the nameplate rang. (A blower motor of larger
power may be used.)
Direct Drive System
The motor shall not be changed, however the speed of
the motor may be increased.
water in
WoodMaster
water out
Domestic Cold
Water in
Domestic Hot
Water out
WoodMaster
The heat exchanger works on the same princi-
pal as your car heater. Air blows through the
heat exchanger, taking the heat from the water
and blowing it into your existing duct work.
Hot Water Supply from WoodMaster
(Always put supply in lower port.)
Cold Water Return to
WoodMaster
Installation

10 LT 90 Owners Manual 2015
Hot Water Supply from
WoodMaster
Cold Water Return to
WoodMaster
Existing Heat
Zone Return
WoodMaster Water to
Water Heat Transfer Unit
Circulating Pump
for Existing Hot
Water Heating
System
Existing Hot
Water Boiler
Cold Water Return from
Heat Exchanger
Domestic Water
Supply for fi lling
boiler
Cold Water
Return to
WoodMaster
Exisng Hot Water Heat
A Water to Water Heat Transfer Unit (0020-052) is used to connect to an exisng hot water boiler system.
Note: Any changes that are made to an exisng boiler should be done by a qualied
plumber and follow all state and local codes.
In Line Filter and Fill Valve Assembly
The In Line Filter and Fill Valve Assembly (0020-325) must be installed in the cold water return line before the
line exits the building. It should be placed so that a garden hose can be connected between a domesc water
supply and the ll valve.
Hot Water Supply from
WoodMaster
Cold Water Return to
WoodMaster
Existing Heat
Zone Return
WoodMaster Water to
Water Heat Transfer Unit
Circulating Pump
for Existing Hot
Water Heating
System
Existing Hot
Water Boiler
Cold Water Return from
Heat Exchanger
Domestic Water
Supply for fi lling
boiler
Cold Water
Return to
WoodMaster
Filling With Water
Connect a garden hose between a domesc water supply and the furnace ll valve (0020-325), which was
installed in the cold water return line at a point just prior to its exing the building. Make sure that valves not
being used on the furnace are closed and the valves that are being used are open. Begin lling and inspect for
leaks on all ngs. Repair any leaks that are found. The furnace may also be lled through the vent pipe in
front of the chimney.
Rounely pay aenon to the water level light. If the light is not lit, this indicates that the water level is low
and the furnace may need to have water added. Add water unl it ows out of the vent pipe. Install the vent
cap into the vent pipe once the furnace is lled with water.
Note: Place the steam saver on the furnace vent once the furnace is full.
Installation

11
LT 90 Owners Manual
2015
Firing The Furnace
Once properly installed and full of water, go to the E.T.C. control and turn fan switch o. If below “LA” (Low
Alarm, see E.T.C. Secon) press set on Dixell. Paper and kindling should be used for starng the re. Build a
small re, turn fan switch to on, and close fuel door. Be sure that the pumps are circulang when ring the fur-
nace. Add wood as needed to increase water temperature to 170°F. Once the furnace has reached 170°F, the
furnace is ready to be lled to capacity to operate for a 12 hour period.
Rotate ash from back to front, maintaining a level coal bed. Load wood towards the back of the furnace for
improved eciency. WoodMaster recommends burning cut, split and seasoned wood. Do not overll so that
hot coals fall out of the furnace when opening the fuel door. During periods of warmer weather, you may nd
it to have creosote inside the rebox. It is important to ll the furnace only with enough wood to last up to a
12 hour period. Aer burning your furnace for a period of me, you will discover how much wood is needed
per day and what types of wood burn the best.
Loading the Furnace
When loading your furnace the manufacturer recommends that you center your wood lengthwise in one row
as shown below. This will allow air from the dra fan to circulate properly creang the opmum burn
environment.
SIDE VIEW FRONT VIEW
Operation
Note: The amount of wood needed to heat your system will vary depending on a lot of
dierent factors. System design, insulaon values and type of wood are a few of the
contribung factors that will determine how much wood is needed.
Be mindful of the latch on the front door and air holes on rear door when you are stack-
ing the wood.

12 LT 90 Owners Manual 2015
Operation
Ash Rotaon
Maintaining proper ash rotaon and wood ll is crucial to the performance of your WoodMaster furnace.
Keeping a fresh bed of coals on the top of your ashes will ensure that you get the most out of whatever kind of
wood that you burn by burning and breaking down the wood to its smallest usable form. To make sure
that you are rotang your ashes properly, follow the instrucons below.
1. With your Ash Hoe, pull the ash from the back of the
furnace to the front, and level coal bed.
2. Load wood length wise towards the back. Be
careful not to damage rear door or plug air holes.
Remove ash from the front of the furnace as needed. Make sure not to remove any hot coals with the ash,
and properly dispose of hot ash in a metal container. Dispose of all ash properly. For more informaon, see the
maintenance secon.

13
LT 90 Owners Manual
2015
ELECTRONIC TEMPERATURE CONTROL (E.T.C.):
Funcon: (Factory Sengs below)
• The E.T.C. monitors and controls the WoodMaster water temperature by controlling the dra and dra fan.
• During normal operaon (adequate wood supply) the controller will turn o the dra and dra fan when the water
reaches 170° F (Set) and will turn on the dra and dra fan when the water falls 10° F (Hy, see page 20).
• During shut down (low wood supply) or when the water falls to 120° F (ALL, see page 20) the controller will shut o
the dra and dra fan. At this me, the WoodMaster will need to be lled with wood and the ETC will need to be reset.
(See page 13)
Energy Start Shut-Down (LA):
• This funcon shuts down the WoodMaster dra and dra fan when not in use and back-up system is operang
(Example: if gone for the weekend, wood ring furnace runs out of wood and back-up system takes over). To restart
the WoodMaster, simply push the Set Buon.
Start Up / Reset
• The rst me the WoodMaster is powered up or when it has shutdown, the controller display will ash “LA” two
mes and then display the water temperature for two seconds and then start over. This is normal and indicates the
system has shut down because the water is at or below 120° F.
• To start up (or reset) your WoodMaster, press the set buon one me. The display will indicate “rSt” (reset) and aer
1 to 2 seconds, the dra will open and the dra fan will turn on. The display will connue to ash “LA” and the water
temperature will be displayed unl the water temperature reaches 140° F (ALL + 20). Aer water temperature
reaches 140° F, only the water temperature will be displayed unl the water temperature falls to 120° F.
• Note: The fan switch must be in the on posion.
• Note: Fan switch can be shut o when loading or for servicing.
Parameter Descripon and Factory Sengs:
• Set (Set Point) - 170° F
• Hy (Dierenal) - 10° F
• ALL (Low Alarm) - 120° F
How To:
• View Set Point — Push and immediately release the set key, display will indicate set point and will return to water
temperature aer 5 seconds.
• Change the Set Point — Push and hold the set key unl the set point is displayed, change the value using the up and
down arrows, and press the set key. The set point will ash a few mes and then the display will return to water tem-
perature.
• Change Hy or ALL — Push and hold the set and down arrow keys at the same me unl Hy is displayed. Using
the up and down arrows, select the parameter to be changed (Hy or ALL), push the set key once (value of parameter
should be displayed), use arrows to change value, and push the set key (value should ash a few mes). Aer 10-15
seconds the display will change back to water temperature.
Green Float Light:
• Green light on: Water level O.K.
• Green light o: Water level low, add water.
Light Switch: Operates lights.
Fan Switch: The fan switch must be on during normal operaon, but may be turned o to ll furnace or for maintenance.
E.T.C. Guide
Reference

14 LT 90 Owners Manual 2015
Time
Temperature
Fan ON
Heating
Set Point
Set Point- Hy
4. FRONT PANEL COMMANDS
LED1
LED 2
SET: Displays the target set point; selects and confirms a parameter
in the programming mode. Also used in conjunction with (UP)
and(DOWN) to view the Min and Max recorded temperatures
and to reset the stored temperatures.




(UP): To see the last temperature alarm that occurred; in
programming mode it browses the parameter codes or increases
the displayed value.




(DOWN) To see the last temperature alarm that occurred; in
programming mode it browses the parameter codes or
decreases the displayed value.
KEY COMBINATIONS:
+ To lock & unlock the keyboard.
SET +To enter in programming mode.
SET + To return to the temperature display.
4.1 USE OF LEDS
Each LED function is described in the following table.
LEDMODE FUNCTION
ON - Output enabled
Flashing - Programming Phase (flashing with LED1)
- Anti-short cycle delay enabled
LED1 Flashing - Programming Phase (flashing with )
LED2 ON -Temperature Alarm has happened, LED2 stays
on until reset
5. TEMPERATURE ALARM AND ITS DURATION
Example of Low temperature alarm
Digital custom controller
XR30C FOR WOODMASTER
1. GENERAL WARNING
1.1 PLEASE READ BEFORE USING THIS MANUAL
1.2 SAFETY PRECAUTIONS
2. GENERAL DESCRIPTION
3. CONTROLLING LOADS
3.1 THE REGULATION OUTPUT
3.2 CH = HT: HEATING APPLICATION.
CONTENTS
1. GENERAL WARNING ___________________________ 1
2. GENERAL DESCRIPTION_______________________ 1
3. CONTROLLING LOADS_________________________ 1
4. FRONT PANEL COMMANDS _____________________ 1
5. TEMPERATURE ALARM AND ITS DURATION
RECORDING (HACCP)_________________________ 1
6. MAIN FUNCTIONS_____________________________ 2
7. PARAMETERS________________________________ 2
8. ALARM SIGNALS______________________________ 2
9. DEFAULT SETTING VALUES ____________________ 2
• This manual is part of the product and should be kept near the
instrument for easy and quick reference
• The instrument shall not be used for purposes different from
those described hereunder. It cannot be used as a safety device
• Check the application limits before proceeding
• Some parameters, such as CH are not applicable to
Woodmaster see default settings grid fig. 15 on next page
• Check the supply voltage is correct before connecting the
instrument
• Do not expose to water or moisture: use the controller only within
the operating limits avoiding sudden temperature changes with
high atmospheric humidity to prevent formation of condensation
• Warning: disconnect all electrical connections before any kind of
maintenance
• Fit the probe where it is not accessible by the End User. The
instrument must not be opened
• In case of failure or faulty operation send the instrument back to
the distributor or to “Dixell s.r.l.” (see address) with a detailed
description of the fault
• Consider the maximum current, which can be applied to each
relay (see Te chnical Data)
• Ensure that the wires for probes, loads and the power supply are
separated and far enough from each other, without crossing or
intertwining
• In case of applications in industrial environments, the use of
mains filters (our mod. FT1) in parallel with inductive loads
could be useful
Model XR30C, format 32 x 74 mm, is a digital thermostat. It
provides two relay outputs, one for the fan, the other one for
alarm signalling. The probe input can be selected between
PTC or NTC. The instrument has a digital input, for alarm
signalling, or for switching the auxiliary output.
The regulation is performed according to the temperature
measured by the probe.
The instruments are provided with the CH programmable
parameter, which enables the user to set the regulation both
for heating or cooling applications:
CH = Ht: heating applications, which is the application here.
The Hy value is automatically set under the Set Point. If the
temperature decreases and reaches set point minus differen-
tial the regulation output is activated and then turned off when
the temperature reaches the set point value again.
Alarm
E.T.C. Guide
Reference

15
LT 90 Owners Manual
2015
If the LED2, the alarm LED is on, an alarm has taken place
To see the kind of alarm, the max (min) reached temperature and
alarm duration do as follows:
1. Push the Up or Down key.
2. On the display the following message is shown:
“HAL” for high temperature alarm (“LAL” for the minimum
alarm), followed by the Maximum (minimum) temperature.
Then the “tiM” (tiMe) message is displayed, followed by the
“Duration” in h.mm.
3. Then the instrument displays the temperature once again.
NOTE1: if an alarm is still occurring the “tim” shows the partial
duration.
NOTE2: the alarm is recorded when the temperature comes back
to normal values
1.
Hold the SET key pressed for more than 3s, while the recorded
alarm is displayed. (The rSt message will be displayed)
2. To confirm the operation, the “rSt” message starts blinking
and the normal temperature will be displayed.
Push and immediately release the SET key: the
display will show the Set point value;
Push and immediately release the SET key or wait for 5
seconds to display the probe value again.
1. Push the SET key for more than 2 seconds to change the Set
point value;
2. The value of the set point will be displayed and the LED1
starts blinking;
3. To change the Set value push the or arrows within 10s.
4. To memorise the new set point value push the SET key again
or wait 10s.
To change the parameter’s value operate as follows:
Enter the Programming mode by pressing the Set
and DOWN key for 3s and LED1 starts blinking.
1. Select the required parameter.
2. Press the “SET” key to display its value (only
LED is blinking).
3. Use “UP” or “DOWN” to change its value.
4. Press “SET” to store the new value and move to the following
parameter.
To exit: Press SET + UP or wait 15s without pressing a key.
NOTE: the set value is stored even when the procedure is exited
by waiting the time-out to expire.
1. Keep pressed for more than 3 s the and keys.
2. The “POF” message will be displayed and the keyboard will
be locked. At this point it will be possible only to see the set
point or the MAX o Min temperature stored.
3. If a key is pressed more than 3s the “POF” message will be
displayed.
5.1 HOW TO SEE THE ALARM DURATION AND MAX
(MIN) TEMPERATURE
5.2 HOW TO RESET A RECORDED ALARM OR ONE
THAT IS STILL OCCURRING
6. MAIN FUNCTIONS
6.1 HOW TO SEE THE SETPOINT
6.2 HOW TO CHANGE THE SETPOINT
6.3 HOW TO CHANGE A PARAMETER VALUE
6.4 HOW TO LOCK THE KEYBOARD
6.5 TO UNLOCK THE KEYBOARD
7. PARAMETERS
REGULATION
DISPLAY
ALARM
8. ALARM SIGNALS
Message Cause Outputs
“LA” Minimum temperature alarm Outputs unchanged.
8.1 ALARM RECOVERY
9. DEFAULT SETTING VALUES
Label Name Range °F Level
Set 1rP071SU÷SLtniopteS
Hy Differential 0,125.5°C/ 1255°F10 Pr1
ALL Minimum temperature
alarm
-50.0°CSet/-58°FSet120Pr1
Keep pressed together for more than 3s the and keys, till
the “Pon” message will be displayed.
Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for
set point. Fan Cut IN is Set Point Minus Differential (Hy). Fan
Cut OUT is when the temperature reaches the set point.
CF Temperature measurement unit:
°C=Celsius; °F=Fahrenheit. WARNING: When the measurement
unit is changed the SET point and the values of the parameters
Hy, LS, US, Ot, ALU and ALL have to be checked and
modified if necessary).
rES Resolution (for °C): (in = 1°C; dE = 0.1 °C) allows decimal
point display.
ALL Minimum temperature alarm: (-50.0 ÷ SET°C; 58÷230°F
when this temperature is reached the alarm is enabled and
fan will shut off.
AFH Differential for alarm recovery: ((1÷45 °F) It sets the value
above the alarm value for alarm recovery.
Probe alarm “P1” starts some seconds after the fault in the related
probe; it automatically stops some seconds after the probe restarts
normal operation. Check connections before replacing the probe.
Temperature alarms “HA” and “LA” automatically stop as soon as
the thermostat temperature returns to normal values.
Alarms “EA” and “CA” (with i1F=bAL) recover as soon as the
digital input is disabled.
Alarm “CA” (with i1F=PAL) recovers only by switching off and on
the instrument.
E.T.C. Guide
Reference

16 LT 90 Owners Manual 2015
Changing the Set Point
1. Press and hold the set buon for 3 seconds or unl the fan symbol is
ashing. The number that appears is the Set Point. (Fig. 1)
2. Use the up or down arrow buons to adjust the seng.
3. Press the set buon to lock in the sengs.
Changing the Hy
1. Press and hold the arrow down and set buons unl the display
reads Hy. (Fig. 2)
3. Press set buon, the number displayed is the dierenal. (Fig. 3)
2. Release the arrow down and set buons.
4. Press the arrow up or down buon to adjust.
5. Press the set buon. (Fig. 6)
6. The display will read ALL for approximately 30 seconds, it will
then return to the water temperature reading.
Changing the All
1. When the E.T.C. reads ALL from the previous step press the set buon.
The number that appears is the Low Alarm temperature.
2. To adjust the number press the up or down arrow.
3. Press the Set buon to lock in the seng.
Denions
Set Point- The temperature at which the fan will shut down.
Hy aka Dierenal- The amount, in degrees, the temperature has to
drop in order to start the fan.
ALL aka Low Alarm- The temperature at which the furnace will shut down.
Do not set your (SP) lower than your (ALL)!
CAUTION!!
(Fig. 1)
(Fig. 2)
(Fig. 3)
(Fig. 4)
(Fig. 5)
(Fig. 6)
WoodMaster Digital Aqua Stat Sengs WoodMaster Digital Aqua Stat
Minimum and Maximum Sengs
Set Point (SP) 170° F
Dierenal (Hy) 10° F
Low Alarm (ALL) 120° F
Set Point (SP) 100° F to 180° F
Dierenal (Hy) 1° F to 45° F
Low Alarm (ALL) -67° F to 302° F
Factory Sengs
E.T.C. Guide
Reference

17
LT 90 Owners Manual
2015
E.T.C. Guide
Reference
Time
Temperature
Fan ON
Heating
Set Point
Set Point- Hy
4. FRONT PANEL COMMANDS
SET: Displays the target set point; selects and confirms a parameter
in the programming mode. Also used in conjunction with (UP)
and(DOWN) to view the Min and Max recorded temperatures
and to reset the stored temperatures.




(UP): To see the last temperature alarm that occurred; in
programming mode it browses the parameter codes or increases
the displayed value.




(DOWN) To see the last temperature alarm that occurred; in
programming mode it browses the parameter codes or
decreases the displayed value.
KEY COMBINATIONS:
+ To lock & unlock the keyboard.
SET +To enter in programming mode.
SET + To return to the temperature display.
4.1 USE OF LEDS
Each LED function is described in the following table.
5. TEMPERATURE ALARM AND ITS DURATION
Example of Low temperature alarm
Digital custom controller
XR30CX FOR WOODMASTER
1. GENERAL WARNING
1.1 PLEASE READ BEFORE USING THIS MANUAL
1.2 SAFETY PRECAUTIONS
2. GENERAL DESCRIPTION
3. CONTROLLING LOADS
3.1 THE REGULATION OUTPUT
3.2 CH = HT: HEATING APPLICATION.
CONTENTS
1. GENERAL WARNING ___________________________ 1
2. GENERAL DESCRIPTION_______________________ 1
3. CONTROLLING LOADS_________________________ 1
4. FRONT PANEL COMMANDS _____________________ 1
5. TEMPERATURE ALARM AND ITS DURATION
RECORDING (HACCP)_________________________ 1
6. MAIN FUNCTIONS_____________________________ 2
7. PARAMETERS________________________________ 2
8. ALARM SIGNALS______________________________ 2
9. DEFAULT SETTING VALUES ____________________ 2
• This manual is part of the product and should be kept near the
instrument for easy and quick reference
• The instrument shall not be used for purposes different from
those described hereunder. It cannot be used as a safety device
• Check the application limits before proceeding
• Some parameters, such as CH are not applicable to
Woodmaster, see Section 9, Default Settings.
• Check the supply voltage is correct before connecting the
instrument.
• Do not expose to water or moisture: use the controller only within
the operating limits avoiding sudden temperature changes with
high atmospheric humidity to prevent formation of condensation.
• Warning: disconnect all electrical connections before any kind of
maintenance.
• Fit the probe where it is not accessible by the End User. The
instrument must not be opened.
• In case of failure or faulty operation send the instrument back to
the distributor or to “Dixell s.r.l.” (see address) with a detailed
description of the fault.
• Consider the maximum current which can be applied to each
relay. (see Technical Data)
• Ensure that the wires for probes, loads and the power supply are
separated and far enough from each other, without crossing or
intertwining.
• In case of applications in industrial environments, the use of
mains filters (our mod. FT1) in parallel with inductive loads
could be useful.
Model XR30CX, format 32 x 74 mm, is a digital thermostat. It
provides two relay outputs, one for the fan, the other one for
alarm signalling. The probe input can be selected between
PTC or NTC. The instrument has a digital input, for alarm
signalling, or for switching the auxiliary output.
The regulation is performed according to the temperature
measured by the probe.
The instruments are provided with the CH programmable
parameter, which enables the user to set the regulation both
for heating or cooling applications:
CH = Ht: heating applications, which is the application here.
The Hy value is automatically set under the Set Point. If the
temperature decreases and reaches set point minus differen-
tial the regulation output is activated and then turned off when
the temperature reaches the set point value again.
Alarm
LEDMODE FUNCTION
ON - Output enabled
Flashing - Anti-short cycle delay enabled
Flashing - Programming Phase
ON -Temperature Alarm has happened, stays
on until reset

18 LT 90 Owners Manual 2015
If the alarm LED is on, an alarm has taken place
To see the kind of alarm, the max (min) reached temperature and
alarm duration do as follows:
1. Push the Up or Down key.
2. On the display the following message is shown:
“HAL” for high temperature alarm (“LAL” for the minimum
alarm), followed by the Maximum (minimum) temperature.
Then the “tiM” (tiMe) message is displayed, followed by the
“Duration” in h.mm.
3. Then the instrument displays the temperature once again.
NOTE1: if an alarm is still occurring the “tim” shows the partial
duration.
NOTE2: the alarm is recorded when the temperature comes back
to normal values.
1.
Hold the SET key pressed for more than 3s, while the recorded
alarm is displayed. (The rSt message will be displayed)
2. To confirm the operation, the “rSt” message starts blinking
and the normal temperature will be displayed.
Push and immediately release the SET key: the
display will show the Set point value;
Push and immediately release the SET key or wait for 5
seconds to display the probe value again.
1. Push the SET key for more than 2 seconds to change the Set
point value;
2. The value of the set point will be displayed and the “˚C” or
“˚F” starts blinking;
3. To change the Set value push the or arrows within 10s.
4. To memorise the new set point value push the SET key again
or wait 10s.
To change the parameter’s value operate as follows:
1. Enter the Programming mode by pressing Set and keys
for three seconds. (the “˚C” or”˚F” LED start blinking)
2. Select the required parameter. Press the SET” key to display
its value.
3. Use “UP” or “DOWN” to change its value.
4. Press “SET” to store the new value and move to the following
parameter.
To exit: Press SET + UP or wait 15s without pressing a key.
NOTE: the set value is stored even when the procedure is exited
by waiting the time-out to expire.
1. Keep pressed for more than 3 s the and keys.
2. The “POF” message will be displayed and the keyboard will
be locked. At this point it will be possible only to see the set
point or the MAX o Min temperature stored.
3. If a key is pressed more than 3s the “POF” message will be
displayed.
5.1 HOW TO SEE THE ALARM DURATION AND MAX
(MIN) TEMPERATURE
5.2 HOW TO RESET A RECORDED ALARM OR ONE
THAT IS STILL OCCURRING
6. MAIN FUNCTIONS
6.1 HOW TO SEE THE SETPOINT
6.2 HOW TO CHANGE THE SETPOINT
6.3 HOW TO CHANGE A PARAMETER VALUE
6.4 HOW TO LOCK THE KEYBOARD
6.5 TO UNLOCK THE KEYBOARD
7. PARAMETERS
REGULATION
DISPLAY
ALARM
8. ALARM SIGNALS
Message Cause Outputs
“LA” Minimum temperature alarm Outputs unchanged.
8.1 ALARM RECOVERY
9. DEFAULT SETTING VALUES
Label Name Range °F Level
Set 1rP071SU÷SLtniopteS
Hy Differential 0,125.5°C/ 1255°F10 Pr1
ALL Minimum temperature
alarm
-50.0°CSet/-58°FSet120Pr1
Keep pressed together for more than 3s the and keys, till
the “Pon” message will be displayed.
Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for
set point. Fan Cut IN is Set Point Minus Differential (Hy). Fan
Cut OUT is when the temperature reaches the set point.
CF Temperature measurement unit:
°C=Celsius; °F=Fahrenheit. WARNING: When the measurement
unit is changed the SET point and the values of the parameters
Hy, LS, US, Ot, ALU and ALL have to be checked and
modified if necessary).
rES Resolution (for °C): (in = 1°C; dE = 0.1 °C) allows decimal
point display.
dLy Display Delay: (0 ÷20.0m; risul. 10s) when the temperature
increases, the display is updateed of 1°C/1°F after this time.
ALL Minimum temperature alarm: (-50.0 ÷ SET°C; 58÷230°F
when this temperature is reached the alarm is enabled and
fan will shut off.
AFH Differential for alarm recovery: ((1÷45 °F) It sets the value
above the alarm value for alarm recovery.
Probe alarm “P1” starts some seconds after the fault in the related
probe; it automatically stops some seconds after the probe restarts
normal operation. Check connections before replacing the probe.
Temperature alarms “HA” and “LA” automatically stop as soon as
the thermostat temperature returns to normal values.
Alarms “EA” and “CA” (with i1F=bAL) recover as soon as the
digital input is disabled.
Alarm “CA” (with i1F=PAL) recovers only by switching off and on
the instrument.
E.T.C. Guide
Reference

19
LT 90 Owners Manual
2015
Changing the Set Point
1. Press and hold the set button for 3 seconds or until the ˚C/˚F is
flashing. The number that appears is the Set Point. (Fig. 1)
2. Use the up or down arrow buttons to adjust the setting.
3. Press the set button to lock in the settings.
Changing the Hy
1. Press and hold the down arrow and set buttons until the display
reads Hy. (Fig. 2)
3. Press set button, the number displayed is the differential. (Fig. 3)
2. Release the arrow down and set buttons.
4. Press the arrow up or down button to adjust. (Fig. 4)
5. Press the set button. (Fig. 5)
6. The display will read ALL for approximately 30 seconds, (Fig. 5)
it will then return to the water temperature reading. (Fig. 6)
Changing the All
1. When the E.T.C. reads ALL from the previous step press the set
-button. The number that appears is the Low Alarm temperature.
2. To adjust the number press the up or down arrow.
3. Press the Set button to lock in the setting.
Definitions
Set Point- The temperature at which the fan will shut down, until
hysteresis is achieved.
Hy aka Differential- The amount, in degrees, the temperature has to
drop in order to start the fan.
ALL aka Low Alarm- The temperature at which the furnace will
shut down. At which point the furnace should be reloaded and the
control is reset.
Note: The temperature scale can be changed from Fahrenheit to
Celsius with the hot key from your WoodMaster Dealer.
WoodMaster Digital Aqua Stat
Factory Settings
Do not set your (SP) lower than your (ALL)!
CAUTION!!
(Fig. 1)
(Fig. 2)
(Fig. 3)
(Fig. 4)
(Fig. 5)
(Fig. 6)
Set Point (SP) 170° F 76.7°C
Differential (HY) 10° F 5.5°C
Low Alarm (ALL) 120° F 48.9°C
WoodMaster Digital Aqua Stat
Minimum and Maximum Factory Settings
Set Point (SP) 100° F to 180° F
38° C to 82° C
Differential (HY) 1° F to 45° F
1° C to 25° C
Low Alarm (ALL) -67° F to 302° F
-55° C to 150° C
Note: The procedures are the same wether you are using degrees (F) or degrees (C).
Changing E.T.C. Settings
For units equipped with the XR30CX
E.T.C. Guide
Reference

20 LT 90 Owners Manual 2015
(Fig. 1)
(Fig. 2)
To maintain the eciency of your furnace the manufacturer recommends that you preform these checks a
minimum of once a week. You may need to clean it more frequently depending on the heat load and the type
of wood that you are burning.
Cleaning The Fire Box and Heat Exchanger Tubes:
1. Ensure fan switch is o and wood level is low.
2. Open the Heat Exchanger Access Box Door.
3. Remove the Swirlys from the Heat Exchanger Tubes. (Fig. 2)
4. Run the Swirly in and out of each tube several mes. (Fig. 2)
5. Clean out all ash that is le in the Heat Exchanger Access Box.
6. Ensure Swirlys are back in the Heat Transfer Tubes and close the door.
7. Scrape down the Fire Box.
8. Shovel out the ash.
CAUTION: The swirlys, ash and furnace may be hot.
Ash Removal and Disposal (Weekly or as needed)
Remove the ashes when the furnace is very low on wood. Use a shovel to take the ashes from the front of the
re box and use a Ash Hoe to pull the ashes from the rear of the furnace to create a level bed of hot coals. The
ashes should be placed in a metal container with a ght ng lid. The closed container of ashes should be
placed on a noncombusble oor or on the ground and well away from all combusble materials, pending nal
disposal. Ashes should be retained in the closed container unl all of the cinders have thoroughly cooled.
CAUTION: Hot coals can last for days, disposing of them improperly or too soon can cause a re.
Note: Try to keep the Combuson Fan and the Dra Inducer Blades was clean as possible. Clean the Combus-
on Fan by using a brush to keep the impeller clear of any build-up. (Fig. 1) Inspect re box for creosote and
ash corrosion.
Maintenance