Yunca Gas LEEDZ INBUILT Installation guide

09-06-01 Page 1 of 1 op-instruct-leedz-ib.doc
GAS HEATER
OPERATIONS, MAINTENANCE
&
WARRANTY INFORMATION

09-06-01 Page 2 of 2 op-instruct-leedz-ib.doc
CONTENTS PAGE
INTRODUCTION 3
INSTALLATION 4
FLUE INSTALLATION 5
CLEARANCES 6
CONNECTING THE FAN 6
CONNECTION TO GAS SUPPLY 7
TESTING PRESSURES 8
OPERATION 9-10
MAINTENANCE/CLEANING 10-13
FAULT FINDING GUIDE 14-16
Appendix A GAS TYPE CONVERSION 17-18
Appendix B PARTS LIST 19-20
Appendix C INJECTOR SIZES 21
Appendix D WARRANTY 22
Appendix E FAN WIRING DIAGRAM 22
WARRANTY REGISTRATION 23

09-06-01 Page 3 of 3 op-instruct-leedz-ib.doc
INTRODUCTION
Welcome and congratulations on purchasing your YUNCA LEEDZ INBUILT FLUED GAS HEATER.
Please read the following information carefully before attempting to operate the heater and ensure all
members of your household understand how this elegant and highly efficient heater functions.
Please fill out and return the Warranty registration and installation
checklist card promptly.
These instructions should be stored in a convenient safe place for ready reference. If you have any
questions regarding your heater please contact your YUNCA LEEDZ dealer.
The YUNCA LEEDZ INBUILT FLUED GAS HEATER is a listed gas-fired, conventionally vented, room
heater tested by independent laboratories to New Zealand standards.
The installation of the YUNCA LEEDZ INBUILT FLUED GAS HEATER must be carried out by a suitably
qualified person and comply with the current New Zealand installation code, NZS 5261:1996. (For
Australian Installations, code AG 601)
CAUTION: This appliance must be vented to atmosphere via a sealed flue system. Installation and repair
of the YUNCA LEEDZ INBUILT VENTED GAS HEATER should be done by a qualified person. The
appliance should be serviced at least annually by a qualified service person. Control valve compartments,
burners, fan, and air circulating passageways of the Leedz must be kept free from any lint and dust build
up to ensure efficient and safe operation of the heater. Regular cleaning of the air intake filter will aid this.
DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE.
DO NOT USE OR STORE FLAMMABLE MATERIALS NEAR THIS APPLIANCE.
DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS OPERATIONAL.

09-06-01 Page 4 of 4 op-instruct-leedz-ib.doc
INSTALLATION
Considerations
The most desirable and beneficial location for a YUNCA LEEDS INBUILT HEATER is in the centre of
a building, thereby allowing the most efficient use of the heat created.
The location of windows, doors and the traffic flow in the room where the heater is to be located,
should all be considered.
To obtain maximum heat distribution with any heater a ceiling fan can be fitted.
Another important consideration when installing the Yunca Leedz is availability of power supply to the
fan and plumbing of gas line.
When the appropriate position has been selected the unit can be inserted into the prepared cavity and
bolted to the floor to ensure that the unit remains secure in the event of an earthquake or similar. A
cardboard template has been supplied with your heater and should be placed on the floor so holes can
simply be drilled through the template.
If the heater is being attached to a concrete floor dyna bolts should be used, if the floor is wooden the
bolts used should be long enough to go fully through the floorboards and fixed with nuts and washers
from the underside.
The earthquake brackets are located at the front corners of the heater and are exposed by removing
the hearth.

09-06-01 Page 5 of 5 op-instruct-leedz-ib.doc

09-06-01 Page 6 of 6 op-instruct-leedz-ib.doc
CLEARANCES
The YUNCA LEEDZ INBUILT FLUED GAS HEATER should be installed with clearances equal to or
greater than those recommended below and comply with NZS 5261.
CONNECTING THE FAN
The fan should be connected to the mains supply (240V 50Hz) via the 3m flex and 3pin plug provided.
The cord is stored and attached to the cowl for freighting.
When inserting the heater into the cavity, the cord should be attached to the side of the cowl using the
wire tie provided to stop it being fouled under the heater.
Allowance may need to be made on one side of the cavity for the cord sit if it is to be connected into an
external plug.

09-06-01 Page 7 of 7 op-instruct-leedz-ib.doc
CONNECTING THE HEATER TO A GAS SUPPLY.
Burn only the fuel for which the heater is equipped.
The YUNCA LEEDZ may be shipped from the factory equipped to burn either natural gas, L.P.G. or
propane. The data plate affixed to the back of the heater specifies the gas type, which the heater is
factory equipped for. Fuel Conversion Kits, No. LZ-A16 for natural gas, Kit No. LZ-A15 for L.P.G. or kit
No. LZ-A17 for propane is available from your YUNCA agents.
See Appendix: A for instructions on field conversion from one gas to another. A suitably qualified
person can only do this conversion.
Thermostat:
The thermostat-sensing bulb is located at the bottom front right hand corner of the heater. It should be
placed either inside or outside of the heater in such a place that it can accurately sense room
temperature, whilst still being unobtrusive.
Gas connection:
The gas inlet is located behind the left fascia panel. The inlet is a female 3/8" BSP access is shown in
the following pages.
A separate gas isolation valve should be installed immediately up stream of the connection to the
appliance.
If the heater is intended to run on natural gas, the supplied in line regulator should also be installed in
the gas line.
WARNING: To stop pipe compounds entering the gas line, do not apply sealing compounds to the first
two threads at the tip of any gas connection. All joints should be tested for leaks before operating the
heater.
GAS PRESSURE REQUIREMENTS
Correct gas pressure and the use of a properly sized gas supply line is essential for the safe and
efficient performance of this appliance. The inlet and outlet pressures at the control must be tested on
installation following the procedure over page.
Note: Improper gas pressure will affect heater performance flame colour or cause pilot malfunction.
Natural Gas:
Minimum inlet pressure 1.25 KPa (5"w.g.)
Maximum inlet pressure 5.0 KPa (20"w.g.) With supplied in line regulator fitted.
Operating pressure 1.0kPa (4"w.g.)
L.P.G.
Minimum inlet pressure 2.75 KPa (11"w.g.)
Maximum inlet pressure 3.5 KPa (14"w.g.)
Operating pressure 2.5 KPa (10"w.g.)
CAUTION: Do not use this heater if any part has been under water or exposed to moisture causing
corrosion.
A Qualified service technician should inspect the heater and replace any part of the gas system that
has been under water.

09-06-01 Page 8 of 8 op-instruct-leedz-ib.doc
PRESSURE TESTING:
The pressures listed on the previous page can be tested using a manometer.
To attach manometer, first remove the top louver and side panels as shown in ‘Removing the Front
Door’.
This will expose the back of the control so manometer tubes can be attached to the pressure taps as
shown in Fig 4.
The inlet pressure can be adjusted via in line regulators in the supply to the heater, and the outlet
(operating)pressure by adjusting the valves internal regulator. To locate the valves regulator
adjustment screw the plastic control cover must be removed from the front of the valve. This is done
by removing the bottom screw and inserting a small flat head screwdriver into the slot at the top on the
front of this cover and pulling the cover off.
Refer to fig. 4 below

09-06-01 Page 9 of 9 op-instruct-leedz-ib.doc
OPERATION
How To Light Your YUNCA LEEDZ
1. First read all the instructions for the heater.
2. Check that the control knob "A"(Fig 5) is in the off position, the thermostat knob "B" is turned to its
Highest setting (7) and back burner control “C” should be in the off position.
3. Turn off electric power at the wall.
4. Turn on the pilot light. Turn the knob “A” slightly anti-clockwise to stop. Push the control knob "A"
fully down and turn Anti-Clockwise from OFF to ING, hold for 5-15 seconds. Continuing to hold
down, turn the knob “A” further anti-clockwise to pilot mark. Observe pilot light by looking through
front door. The pilot is located under the left-hand end of the front log set and is visible through the
gap between the front two logs.
5. When the pilot is lit, continue pushing in knob for 20 seconds to allow safety thermocouple to heat
up. Release knob and check pilot flame has remained lit. If it goes out repeat steps 4 & 5.
6. Turn on front burner only. The control knob “A” can now be turned fully to the ON position to light
the front burner
7. Turn electric fan power on and set to low speed.
8. After the front burner has been on for at about 3 minutes. Turn the back burner on, by pushing in
knob “C” and turning Anti-Clockwise to maximum position.
9. Allow both burners to run for 30 minutes to bring the room up to temperature.

09-06-01 Page 10 of 10 op-instruct-leedz-ib.doc
10. Turn the back burner off.
11. Adjust the thermostat down, until the front burner turns off. Note the thermostat number and turn
up by ½ to 1½ a thermostat number till the front burner turns on.
12. Leave the fan on.
To further increase the room temperature follow the following steps:
1st Turn the fan on to high speed.
2nd Turn the thermostat up one number.
3rd Turn the secondary burner on to minimum.
4th Turn the secondary burner up to half on.
5th Turn the secondary burner up to maximum.
Note: Various combinations of the settings of knobs “B” and “C” will provide different heat settings
and flame effects.
The first few times that the heater is lit it should only be running for about twenty minutes. And
then allowed to cool. This will eliminate damage to paints and reduce the smoke and odour
caused by burning off of manufacturing oils etc.
HOW TO TURN OFF THE HEATER.
1. Turn the rear burner control, knob “C”, to the off position.
2. Turn off the fan and then electrical power at the wall.
3. Push in the pilot control knob “A” and turn it clockwise to off position.
Note: the knob cannot be turned from “pilot” to “off” unless it is pushed in slightly.
Do not force it.
MAINTENANCE
A qualified service person recommended by your YUNCA dealer should conduct an annual inspection
and undertake any maintenance required on your LEEDZ. Its venting and installation must be checked
to keep it running safely and efficiently. The following procedures should be performed only by a
qualified service person. The gas supply and electrical power should be isolated whenever any
maintenance procedures are undertaken.
Note: the front glass can only be removed after the heater has been turned off for long enough
that the door has cooled to touching temperature.

09-06-01 Page 11 of 11 op-instruct-leedz-ib.doc
REMOVING THE FRONT DOOR.

09-06-01 Page 12 of 12 op-instruct-leedz-ib.doc
REMOVING THE GLASS FOR REPLACEMENT.
1. Remove the front door as described on previous page, and place front down on a soft
surface.
3. Remove the bottom glass retainer by taking out the four screws along the base of the door
4. To remove the front glasses place one hand under it and lift it up and out of the doorframe.
5. New glass with gasket attached can be ordered through your YUNCA LEEDZ agent.
Note: Only the genuine Yunca glass may be fitted.
6. Place replacement glass in position in the reverse order of removal.
7. Replace bottom glass retainer with screws.
REPLACING THE GASKET.
The YUNCA LEEDZ has a 10mm fibreglass gasket surrounding the front door. Should it ever need
replacement, use only the replacement gasket that is available from your YUNCA dealer. The
reference number for this is listed in the parts list.
Procedure.
1. Remove the front door as described above.
2. Remove the existing gasket and clean its channel with a brush.
3. Lay a thin bed of gasket cement around the length of the channel.
4. Lay the gasket in the channel with the join half way along the bottom.
5. Replace the door carefully to avoid dislodging the gasket.
CLEANING THE GLASS
The glass may be cleaned with ordinary household glass cleaner and a soft cloth or paper towel.
Note: Never clean the glass when it is hot. Do not use abrasive cleaners on the Glass.

09-06-01 Page 13 of 13 op-instruct-leedz-ib.doc
CLEANING THE LOG SET AND FIREBOX.
During the annual inspection and maintenance appointment, the service person should clean dust, lint
and any light soot accumulation from the logs and the firebox area. An extra soft brush should be used
on the logs, as they are extremely fragile. If at any time the logs cannot be removed or installed
without force, the cause must be found. The logs must never be forced.
Procedure:
1. Remove front door as described previously
2. Remove the front log set from the firebox by lifting it up and out. Brush it gently over a newspaper
and carefully place it out of the way.
3. Remove the backlog and clean it in the same way.
4. The bark tray can be removed by lifting and pulling it straight out, with the bark still on it.
5. The bark consists of a mixture of vermiculite and composite chips and it can be dusted by sieving. If
needed a replacement bag can be ordered through your YUNCA dealer.
(See parts list for reference number)
6. With firebox empty a vacuum cleaner can be used to remove any visible dust and lint from within the
firebox area.
7. Replace logs in the reverse order of removal.
8. Replace the bark tray and redistribute the bark.
9. Replace and relatch the front door and close the side panels.

09-06-01 Page 14 of 14 op-instruct-leedz-ib.doc
FAULT FINDING GUIDE
SYMPTOM PROBLEM CORRECTIVE
Pilot Will Not Light. No spark at pilot burner.
Spark gap is incorrect.
No gas at pilot burner
No Supply Gas.
Check connection between electrode in
pilot assembly and lead from control.
Press connection hard together.
Replace the pilot assembly if ceramic
insulator is cracked or broken
Spark gap should be 3-4mm between the
electrode tip and the pilot flame hood.
The height of the electrode can be
adjusted with the brass holding nut on its
base
Check that isolating valves are turned on
and gas is available.
Check pilot hood for blockage
Remove pilot jet and blow clean. The jet is
located inside the base of the pilot burner
and is removed by disconnecting the gas
to the pilot and removing the brass nut
from the base of the burner. Jet will fall
out.
Check for any obstructions in the gas line
that may cause low pressure or restrict
flow.
Purge gas lines.
L.P.G. -- Refill tank
Natural -- Check with gas supplier.

09-06-01 Page 15 of 15 op-instruct-leedz-ib.doc
Soot is being
deposited on glass or
logs.
There is insufficient
secondary air in the
combustion chamber.
The logs are not properly
positioned.
Incorrect gas pressures.
Check the back of the heater for blockages
around the air intake slots.
Check that the clearances around the
heater match those stated in this manual.
Ensure that the front log set is sitting flat
with no bark chips under it and that the
locating pins are in their holes.
Check that the backlog is sitting on its
brackets.
Check and set gas pressure to
manufacturers specifications.
Front burner
extinguishing.
Thermostat not correctly
sensing the room
temperature.
Thermostat knob set to low.
Position the thermostat bulb at back of the
heater on fan inlet duct.
Adjust the Thermostat knob up to give
desired room temperature.
Main burners
extinguishing.
Flue down draughting.
Flue way blocked
Pilot flame is not large
enough.
Severe down draught.
A vacuum in the room causes this.
Turn off heater. Turn off all air
conditioners, expelair fans, other heaters
etc. Open doors and windows to allow
pressure to equalise. Relight heater.
Close doors and windows but not
completely.
Remove blockage.
Check that pilot assembly is correctly
mounted and that the pilot burner flame
hood directs the pilot flame over both
burners and the thermocouple.
If the flame pattern is disturbed during
extreme winds then ensure a
recommended flue cowl has been fitted
and is still in place.

09-06-01 Page 16 of 16 op-instruct-leedz-ib.doc
Pilot will not stay lit
Incorrect operation.
Weak or improperly located
pilot flame.
Thermocouple not properly
connected.
Defective thermocouple.
Faulty control valve.
Operator not following correct lighting
procedure, see lighting instructions.
Adjust the height of the thermocouple
(Using the brass nut at its base)
The flame should engulf the top 8mm of the
thermocouple.
Check back of main control where
thermocouples copper tube enters the
control. Tighten brass-collar nut.
Replace thermocouple
A new thermocouple may be ordered
through your YUNCA agent.
(See parts list.)
A replacement may be fitted by a suitably
qualified service person.
(See parts list).
Pilot burning no gas
to burners
Burner injectors may be
blocked.
Faulty control
Disconnect gas supply at burners and
unscrew brass injectors from end of burner.
Use compressed air to clean out orifice.
Control requires replacement.
Back burner stays on
when switched to off
position.
Build up on the control
valve.
Disassemble the control valve by removing
the two screws below the cover. Extract the
control valve note the position. Clean the
control valve clean and re-assemble. Test
operation.

09-06-01 Page 17 of 17 op-instruct-leedz-ib.doc
APPENDIX A:
GAS TYPE CONVERSION
If at any stage the heater is required to run on a gas other than that which it was factory equipped a
conversion kit can be ordered through your YUNCA dealer, see parts list for reference number in
Appendix.
The conversion should be done by a suitably qualified person.
Steps
1. Isolate the heater from the gas supply
2. Remove the front door as described previously. Refer Maintenance – Removal of Door
3. Remove the front logset and bark tray, remove the back log.
4. Disconnect the supply pipes from the burners.
5. The burner module can be unscrewed, it is held in place by two screws located between the
burners.
6. Undo the screw on the left hand burner support bracket.
7. Lifting the burner module. The two screws that attach the pilot assembly are now accessible
under the front burner, remove these screws.
8. It is now possible to remove the entire main burner module.
9. Burner Injector Change. Unscrew the brass injector holders from the burner frame.
10. The brass injectors are threaded into the end of the injector holders, they can be removed
with a 7mm spanner, and the new injectors fitted. See Appendix – Injector Size. An
approved sealing compound should also be used. Replace the Brass injector holders on to
the burner frame.
11. Pilot Jet Change. Disconnect the gas supply pipe to the pilot burner.
12. Disconnect Spark Electrode and then Thermocouple

09-06-01 Page 18 of 18 op-instruct-leedz-ib.doc
13. The pilot jet can be now removed. Insert new pilot jet from conversion kit ensuring the
chamfered end is facing upwards.
14. Back Burner Controller outlet Change. When changing from N.G. to LPG, the in line
restrictor, located in the rear burner pipe where it attaches to the control, must me removed.
When changing from LPG to NG, this restrictor (Cone facing Out) must be placed in rear
burner pipe at the control.
15. Front Burner Controller outlet Change. The brass reducer that couples the front burner
pipe to the control must also be changed and the reducer supplied with kit fitted. (LPG 8mm
Bore/ Natural 1.7 mm Bore.
16. Inline Regulator.
From Natural Gas: Remove the Inline regulator that’s before the Control Valve.
To Natural Gas:Install the Inline regulator and pipe before the Control Valve.
17. Reconnect the Gas pipes and resemble main burner module.
18. Test all connections for gas tightness and replace logs and door.
19. Update or replace appliance data plate for new specifications and Apply Correct Gas sticker.

09-06-01 Page 19 of 19 op-instruct-leedz-ib.doc
APPENDIX B:

09-06-01 Page 20 of 20 op-instruct-leedz-ib.doc