Lennox Hearth Products Merit Series MED-CK-LP TO NG User manual

KIT CONTENTS (See Figure 1):
1 ea. Robertshaw NG Regulator Kit (A)
1 ea. #41 NG main burner orifice (25,000 BTU’s) (B)
1 ea. Instruction Sheet
TOOLS NEEDED (See Figure 2):
5/32” Allen Wrench Or T-Handle Wrench
Phillips Screwdriver
1/2” Open End Wrench
7/16” Open End Wrench
MEDINA™ GAS CONVERSION INSTRUCTIONS LP TO NG
CAT. NO. H5465, MODEL MED-CK-LP TO NG
INSTALLATION INSTRUCTIONS FOR CONVERTING FROM PROPANE GAS (LP) TO
NATURAL GAS (NG). FOR USE WITH THE MEDINA™ DIRECT VENT GAS FIREPLACE INSERTS
775,237M
Rev. A, 12/2007
HEARTH PRODUCTS
KITS AND ACCESSORIES
WARNING
This conversion kit shall be installed by a qualified
serviceagencyinaccordancewiththemanufacturer's
instructionsandallapplicablecodesandrequirements
of the authority having jurisdiction. If the information
in these instructions is not followed exactly, a fire,
explosionorproductionofcarbonmonoxidemayresult
causing property damage, personal injury or loss of
life. The qualified service agency performing this
installationisresponsiblefortheproperinstallationof
thiskitandassumesresponsibilityforthisconversion.
The installation is not proper and complete until the
operation of the converted appliance is checked as
specified in the manufacturers instructions supplied
with the kit.
IMPORTANT LE CANADA SEULEMENT
La conversion devra être effectuée conformément
aux recommandations des autorités provinciales
ayant juridiction et conformément aux exigences
du code d'installation CAN/CSA B149.1 .
IMPORTANT CANADA
Theconversionshallbecarriedoutinaccordancewith
therequirementsoftheprovincialauthoritieshaving
jurisdictionandinaccordancewiththerequirements
of the CAN/CSA B149.1 Installation code.
AVERTISSEMENT
Cet équipement de conversion sera installé par une
agencequalifiéedeserviceconformémentauxinstruc-
tionsdufabricantettoutesexigencesetcodesapplica-
blesdel'autorisésavoirlajuridiction. Sil'information
danscetteinstructionn'estpassuivieexactement, un
feu,explosion ou productiondeprotoxydedecarbone
peut résulterle dommagescauser depropriété,perte
oublessurepersonnelledevie. L'agencequalifiéede
service est esponsable de l'installation propre de cet
équipment. L'installationn'estpaspropreetcompléte
jusqu'à l'opération de l'appareil converti est chéque
suivant les critères établis dans les instructions de
propriétaire provisionnées avec l'équipement.
IMPORTANT
The burner orifices provided in this kit are only for
use at elevations of 0 to 2,000 feet (610 M) in the
USA and 0 to 4,500 feet (0-1372 M) in Canada. At
higher elevations the BTU input must be de-rated
by 4% for every 1,000 feet (305 M) to maintain
the proper ratio of gas to air. If the installer must
convert the unit to adjust for varying altitudes, a
derationinformation stickermust befilledoutbythe
installer and adhered to the appliance at the time
of the conversion. Contact your local gas supplier
for deration requirements for your area.
DRAFT
12-17-2007
A
B
Fig. 2
Figure 1 - Kit Contents
Figure 2 - Tools Needed
™
1

READ ALL THE STEPS BEFORE STARTING THE CONVERSION.
INSTALLER NOTICE: THESE INSTRUCTIONS MUST BE LEFT WITH
THE APPLIANCE.
This kit contains components required to convert this appliance
from using Propane Gas to using Natural Gas as the only fuel.
All of these components must be replaced in order for the unit to
operate safely on Natural Gas.
When installing gas components use pipe joint compound or
Teflon tape on all pipe fittings before installing (ensure propane
resistant compounds are used, do not use pipe joint compounds
on flare fittings).
INSTALLATION INSTRUCTIONS
Step 1. TURN OFF THE GAS SUPPLY TO THE APPLIANCE.
Step 2.Usinga phillipsscrewdriver,removeanddiscardthe two pressure
regulator mounting screws (see Figure 3). Remove the pressure
regulator and rubber gasket. Discard all removed components.
Install the new regulator. Ensure the rubber gasket on the back
of the pressure regulator is properly positioned when installing
the new pressure regulator using the new screws supplied with
this kit. Locate the label provided in the regulator kit. Write in
the required information, then affix it to the valve.
Figure 4A
Fill out & affix label from
regulator kit to valve Step 6. Using a 7/16” open-end wrench, loosen the stem of pilot hood
assembly with a 1/4 turn counterclockwise (see Figures 5 & 6).
Remove These
Screws
Regulator
Gas Valve
(located in control com-
partment below firebox)
Figure 3 - Replace Regulator on Valve
Figure 5
Step 3. Remove the glass door by releasing the two upper spring latches,
and lifting up, out of the lower latches (see Page 18 of the Instal-
lationandOperationManual). Carefully remove the logs. Exercise
care so as not to break the logs. Set aside in a safe place.
Step 4.Remove log rack by first removing the two 5/32” allen head
screws. Note: Screws secure log rack and front of burner. After
screws are removed you can pull the lock rack straight out mak-
ing sure it’s held high enough to clear over the pilot assembly.
See Figure 4A.
Step 5.Remove burner by shifting it to the right until it releases from
air shutter. Air shutter may need to be shifted to the left before
burner will release. Remove 5/32” air shutter screw before mov-
ing air shutter. See Figures 4A and 4B.
Log rack and burner screws
Burner
Air shutter
screw
Burner
Lift Out Burner
Figure 4B
Pilot Hood
Pilot Stem
7/16” End Wrench
NOTE: DIAGRAMS AND ILLUSTRATIONS ARE NOT TO SCALE.
2

Step 7.Slide the pilot orifice into the NG position by pushing it toward
the opposite side of the pilot stem. The top side of the orifice
slider should appear silver and read NG. The gas supply is now
lined up with the NG orifice. See Figure 6.
Figure 6 - Adjust Orifice Slider to the NG Position
Step 10.
Install burner and log rack, and make sure air shutter is 1/8”
open.
Step 8.
Tighten the pilot stem by turning it clockwise, making sure the
orifice slider stays pushed into the NG position.
Step 9. Using a 1/2” open-end wrench, remove burner orifice. Replace
the #53 LP orifice with the #41 NG orifice. Make sure to use
pipe compound on the threads when installing the new orifice.
See Figure 7.
Figure 7 - Replace Burner Orifice
Figure 8 - Adjust Air Shutter
Air Venturi Open
Air Shutter
1/2” End Wrench
Burner Orifice
Orifice Slider
3
NOTE: DIAGRAMS AND ILLUSTRATIONS ARE NOT TO SCALE.

Step 11. Turn on gas supply and test for gas leaks using a gas leak test
solution (see Test Procedure on Page 12 of the Installation and
Operation Manual).
Step 12.Using a manometer, test the inlet and manifold gas pressure
per instructions in the Installation and Operation Manual (Page
12) and as shown in the following 2 tables.
Step 13.Reinstall the the log set and glass door assembly. See Pages
10 and 11 (Log Set Installation) and Page 18 (Door Assembly
Installation) in the Installation and Operation Manual.
Step 14.Light the appliance per the lighting instructions label on ap-
pliance (located below glass door) or lighting instructions on
Page 13 in the Installation and Operation Manual. Inspect for
proper pilot and burner flame appearances. See Figures 9 and
10 or refer to Pages 14 and 17 of the Installation and Operation
Manual.Figure 10 - Burner Flame Appearance
No Blue Flame
Center
Soot at
Flame Tip
Dark Orange
Flame
IMPROPERLY
BURNING FLAME
Soot above
Flame Tip No Soot at
Flame Tip
PROPERLY
BURNING FLAME
Semi-Transparent
Yellow Flame
Blue Flame
Center
Ports on Pan
Burner Assembly
Figure 9 - Proper Pilot Flame Appearance
Inlet Gas Supply Pressure
Fuel # Minimum Maximum Desired
Nat.
Gas
5" WC/po. C.E
(1.24 kPa)
10.5" WC/po. C.E
(2.61 kPa)
7" WC/po. C.E
(1.74 kPa)
Manifold Gas Supply Pressure
Fuel # Low High
Natural
Gas (Lo) 1.7" WC/po. C.E
(0.42 kPa)
(Hi) 3.5" WC/po. C.E
(0.87 kPa)
4
Printed in U.S.A. © Lennox Hearth Products 2007
P/N 775,237M REV. A 12/2007
Lennox reserves the right to make changes at any time, without notice, in design,
materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.
1110 West Taft Avenue • Orange, CA 92865
NOTE: DIAGRAMS AND ILLUSTRATIONS ARE NOT TO SCALE.