Yunca Gas jervois Installation guide

19-07-05 Page 1 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
Jervois
FREESTANDING GAS HEATER
March 2002
OPERATIONS, MAINTENANCE &
WARRANTY INFORMATION

19-07-05 Page 2 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
CONTENTS: PAGE
INTRODUCTION 3
INSTALLATION 4
FLUE INSTALLATION 5
CLEARANCES 6
CONNECTION TO GAS SUPPLY 7
TESTING PRESSURES 8
OPERATION 9
MAINTENANCE 11
FAULT FINDING GUIDE 15
Appendix A
PARTS LIST 18
Appendix B
INJECTOR SIZES 18
Appendix C
WARRANTY, WIRING DIAGRAM 19
Appendix E
WARRANTY REGISTRATION 20

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INTRODUCTION
Welcome, and congratulations on purchasing your YUNCA JERVOIS FLUED GAS HEATER.
Please read the following carefully before attempting to operate the heater and ensure all members
of your home understand how this elegant and highly efficient heater functions.
Please fill out and return the registration 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 JERVOIS dealer.
The YUNCA JERVOIS FLUED GAS HEATER is a listed gas-fired, conventionally vented, room
heater tested by independent laboratories to Australian and New Zealand standards.
The installation of the YUNCA JERVOIS FLUED GAS HEATER must be carried out by a suitably
qualified person and comply with the current New Zealand or Australian installation code, NZS
5261:1996/ AG 601:1998
CAUTION:This appliance must be flued to atmosphere. Installation and repair of the YUNCA
JERVOIS 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 Jervois must be kept free from any lint and dust build-up to
ensure efficient and safe operation of the heater.
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.
To remove internal packaging, refer to page 11 for front door removal.

19-07-05 Page 4 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
INSTALLATION
Considerations
The most desirable and beneficial location for a YUNCA JERVOIS 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.
If possible a location should be selected that allows the flue pipe to be installed simply and pass
through the house without cutting a floor or roof joist.
To obtain maximum heat distribution with any freestanding heater a ceiling fan can be fitted.
Another important consideration when installing the Yunca Jervois is availability of power supply to
the fan.
When the appropriate position has been selected the unit can be bolted to the floor to ensure that the
unit remains upright in the event of an earthquake or similar. 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.

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Typical Flue Installation

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CLEARANCES
The YUNCA JERVOIS FLUED GAS HEATER should be installed with clearances equal to or
greater than those recommended below and comply with NZS 5261/ AG601.
This is to ensure adequate air circulation around the heater and avoid heat damage to wall coverings.
Note: If walled surface is non-combustible i.e. brick or steel, side clearances may be reduced to
100mm. Corner positions and back clearance remain the same.
(See Fig. 3 Below)
(Fig. 3)

19-07-05 Page 7 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
CONNECTING THE HEATER TO A GAS SUPPLY.
Burn only the fuel for which the heater is equipped.
The YUNCA JERVOIS may be shipped from the factory equipped to burn Natural Gas, Propane or
L.P.G. The data plate affixed to the back of the heater specifies the gas type, which the heater is
factory equipped for. Fuel Conversion Kits are available, contact your YUNCA agents.
Thermostat:
The thermostat sensing bulb is mounted on the back panel.
Gas connection:
The gas inlet is located at the back right hand corner of the heater. The inlet thread is a male 3/8" BSP.
A separate gas isolation valve should be installed immediately up stream of the connection to the
appliance.
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 inline regulator fitted.
Operating pressure 1.0kPa (4"w.g.)
L.P.G. (NZ Only) and Propane
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.

19-07-05 Page 8 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
PRESSURE TESTING:
The pressures listed on the previous page can be tested using a manometer.
To attach manometer, first remove the inspection cover from back panel. The cover is located directly
behind the control and is removed by unscrewing the two top screws.
This will expose the back of the control so manometer tubes can be attached to the pressure taps as
shown below.
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
CONNECTING THE FAN
The fan should be connected to the mains supply (240V 50Hz) via the 3m flex and 3pin plug
provided.

19-07-05 Page 9 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
OPERATION
How to Light Your YUNCA JERVOIS
Refer to Fig 5.
Fig 5: Control Panel.
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 the knob “A” slightly anti-clockwise to stop. Push the control knob "A" fully down and turn
left from OFF to IGN, hold for 5-15 seconds. Continuing to hold down, turn the knob “A” further
anti-clockwise to pilot mark (you will hear a click). Observe pilot light by looking through front
door. The pilot light is visible under the left-hand end of the log set.
5. When the pilot is lit, continue pushing in knob for further 20 seconds to allow safety thermocouple
to heat up. Slowly release knob and pilot flame should remain lit. If it goes out repeat steps 4 and
5. If there is difficulty using control “A” an accessory “Arthritic Control Aid” (6645) is available.
6. The pilot control knob “A” can now be turned fully left to the ON position to light the front burner.
7. Turn electric power on and the fan to low speed.
8. After the front burner has been turned on, turn the back burner on, by pushing in knob “C” and
turning Anti-Clockwise to maximum position.
Allow both burners to run for 30 minutes to bring the room up to temperature.

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9. Turn the back burner down or off. (Depends on room size, smaller rooms may not require the
back burner to run once the room is comfortable).
10. Adjust the thermostat down, to the front burner turns off. Note the thermostat number and turn
up by ½ to1 ½ a thermostat number till the front burner turns on. If the front burner is turning
off at too low a temperature, or too often, adjust the thermostat settings to compensate.
11. Leave the fan on for optimum efficiency. Note: Fan can be turned off, however higher
efficiency is achieved with the fan running.
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 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. If the thermostat, knob “B”, has been in use turn it to its lowest position.
2. Turn the rear burner control, knob “C”, to the off position.
3. Turn off the electrical power at the wall.
4. Push in the pilot control knob “A” and turn it clockwise to off.
Note: the knob cannot be turned from “pilot” to “off” unless it is pushed in slightly.
Do not force it.

19-07-05 Page 11 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
MAINTENANCE
A qualified service person recommended by your YUNCA dealer should conduct an annual inspection
and undertake any maintenance required on your JERVOIS. 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 door can only be removed after the heater has been turned off for long enough so that the
door has cooled to touching temperature.
Removing The Front Door
1. Remove the two rods that form the grill above the door. Sliding a rod to the left, allowing the right
hand end to be disengaged from the side panel. Moving the end clear and extracting the rod out
of the left hand side panel and clear. Repeat for the second rod.
2. This will expose the restraining thumb screws at each side of the door. To open, unscrew the two
thumb screws.
3. The front door can now be removed by pulling the door forward at the top with a slight lift.
4. Lift the door clear of the retaining lip at the bottom of the door.
Replacing the door is the reverse operation. Take care the glass seal is maintained in its correct
position and the thumb screws are tightened to achieve an effective seal
Removing The Glass For Replacement.
1. Remove the front door as described above, and place front down on a soft surface.
2. Remove the screws around the perimeter of the inner door and lift clear.
3. The glass can be lifted clear and discarded or the seal removed. The imitation lead light insert is
loose in the door front.
4. New glass with gasket attached can be ordered through your YUNCA agent.
Note: Only recommended heat resistant glass may be fitted.
5. Place replacement glass in position in the reverse order of removal. Ensure the imitation lead light
insert is centralised before tightening of the screws
Note: Tighten the screws alternately, do not over tighten to avoid damaging glass.
Screws and spire clips may need replacement is suitable assembly compression is not achieved

19-07-05 Page 12 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
REPLACING THE GASKET.
The YUNCA Jervois 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.
Procedure.
1. Remove the front door as described on previous page.
2. Remove the existing gasket and clean the channel of all loose material.
3. Lay the gasket in the channel ensuring the gasket is not stretched.
4. 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.
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 fire box 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 on page 11.
2. Remove the complete 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. The bark tray can be removed by undoing the attachment screws and lifting out.
4. With firebox empty, a vacuum cleaner can be used to remove any visible dust and lint from within
the firebox area.
5. Replace the bark tray.
6. Replace log set.
8. Replace the front door.

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CLEANING UNDER THE TOP AND LOUVRES
Two screws at the back and two lugs at the front hold the top panel in place. Remove the screws. Lift
the top up and slide forward to disengage the front lugs. Move the top to allow the access to clean.
Note: If a flue guard kit has been fitted this will need to be removed at this stage. This is done by
sliding the front half up and out and unscrewing the back half from its brackets.
INSPECTING THE VENTING
An inspection of the venting system should be made during the annual service appointment. There
must be no blockages and the flue must be in good repair. Any sections that are taken apart for
inspection must be reassembled and sealed as required.
CLEANING THE FAN FILTER
This is the one maintenance procedure designed to be carried out by the householder.
It can be cleaned with a brush or vacuum cleaner, and replaced.

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HOW TO REMOVE FAN
The fan unit is designed to be removed as an assembly.
The procedure for this is as follows.
1. Turn off and unplug power to unit.
2. Undo the four screws that attach the fan to the back panel and lift clear.
3. Reach inside the back panel and disconnect the wiring from the switch, taking note of terminal
placement. A wiring diagram appears at the back of this manual.
4. The earth wire must be unplugged and the plastic adapter removed from its retaining bracket.
5. When the fan has been removed it can be disassembled as shown below if needed.

19-07-05 Page 15 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
Fault Finding:
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.
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.

19-07-05 Page 16 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
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 siting
flat with no bark chips under it and that
the locating pins are in their holes.
Check that the back log is sitting on its
brackets.
Check and set gas pressure to
manufacturers specifications.
Main burners
extinguishing. Flue down draughting.
Flueway blocked
Pilot flame is not large
enough.
Severe down draught.
This is caused by a vacuum in the
room.
Turn off heater. Turn off all air
conditioners, expelair fans, other
heaters etc. Open doors and windows
to allow pressure to equalise. Re-light
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.

19-07-05 Page 17 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
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.

19-07-05 Page 18 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
APPENDIX A:
PARTS LIST:
PART NO. PART NAME
6600 Mertik gas control
Burner module
6601 Rear Burner - SIT W-351120
E 7 Front Burner -Furi316
6602 Pilot assembly
6603 Electrode
LZ-G05 Thermocouple
6606J Pilot pipe assembly
6607J Front burner pipe assembly
6608J Rear burner pipe assembly
E 14 Otago Bay Log Set assembly
LZ-B11 Door gasket
1610BX Glass
1950 Booster fan assembly
1955 Rocker switch
JER1703RH Right side panel (state Colour)
JER1703 Left side panel (state Colour)
JER1701 Top panel (state Colour)
JER1701 Main door (state Colour)
JER1707A Enamelled combustion wrap
APPENDIX B
INJECTOR SIZE:
GAS TYPE FRONT BURNER BACK BURNER
NATURAL 2.3mm diameter 2.8mm diameter
L.P.G. (NZ only) 1.15mm diameter 1.15mm diameter
PROPANE NZ 1.25mm diameter 1.25mm diameter

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APPENDIX C: Warranty:
The Yunca Jervois Free Standing Gas Heater is covered by a limited Five-Year Warranty against
defects in materials and workmanship.
All gas and electrical components including control, burners, pilot assembly, tubing, fan and switchers
are warranted for a period of one year from date of purchase.
Glass and surface coatings are also warranted for one year.
Damage caused by neglect, improper use, acts of god, theft, or any other indirect, incidental cause are
not covered by this warranty.
This warranty is void if the recommended service schedule is not implemented as suggested in this
manual and carried out by a suitably qualified person.
Limitations of Liabilities:
Yunca Heating hereby waivers any liability for incidental and consequential damage directly or
indirectly sustained, or for any loss caused by the application of this product not in accordance with
the current printed instructions.
Our liability is expressly limited to replacement of defective goods as per above warranty. Any claim
shall be deemed waived unless made in writing to Yunca within 30 days from the date that it was or
reasonably should have been discovered.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
APPENDIX D: Fan Wiring Diagram:

19-07-05 Page 20 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
CUSTOMER COPY
YUNCA JERVOIS WARRANTY REGISTRATION:
Serial No._________________ Gas Type. _____________ Purchase Date_______________
Purchasers' Name. ___________________________________________________________
Purchasers’ Address. _________________________________________________________
City. _____________________________ PostCode. ____________ Telephone __________
Where Purchased. ____________________________________________________________
Installed By. ________________________________________________ Date. _____________
Yunca Gas Dunedin
PO Box 500
DUNEDIN
Telephone [phone]
Cut along here…
This section must be returned within 10 days of purchase.
YUNCA JERVOIS WARRANTY REGISTRATION:
Serial No._________________ Gas Type. _____________ Purchase Date_______________
Purchasers' Name. ___________________________________________________________
Purchasers’ Address. _________________________________________________________
City. _____________________________ PostCode. ____________ Telephone __________
Where Purchased. ____________________________________________________________
Installed By. ________________________________________________ Date. _____________
Return to: Yunca Heating
PO Box 932
INVERCARGILL