Lennox MPD35ST-PM User Manual

Preliminar y
04-01-05
HOMEOWNER'S CARE AND OPERATION INSTRUCTIONS
DIRECT VENT SEE-THROUGH
MERIT® PLUS SERIES
DIRECT-VENT GAS FIREPLACE HEATERS
P/N 875,025M REV. NC 04/2005
MODELS
Millivolt Models Electronic Models
MPD35ST-NM MPD35ST-NE MPD35ST-PM
Preliminar y
WARNING: IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLO­SION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
FOR YOUR SAFETY: Do not store or use gasoline or other fl ammables or liquids in the vicinity of this or any other appliance.
FOR YOUR SAFETY: What to do if you smell gas:
• DO NOT light any appliance.
• DO NOT touch any electrical switches.
• Do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow your gas suppliers instructions.
• If your gas supplier cannot be reached, call the fi re department.
Installation and service must be performed by a qualifi ed installer, service agency or the gas supplier.
04-01-05
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
A French manual is available upon request. Order P/N 875,025CF
Ce manuel d’installation est disponible en francais, simplement en faire la demande. Numéro de la pièce 875,025CF
Listing Agency
OTL Report No. 116-F-28-5
CONGRATULATIONS!
In selecting this LENNOX Direct-Vent Gas Appliance you have chosen the fi nest and most
dependable fi replace to be found anywhere. Its a beautiful, prestigious alternative to a wood burning fi replace. Welcome to a Family of tens of thousands of satisfi ed LENNOX Fireplace Owners.
Please carefully read and follow all of the instructions found in this manual. Please pay special attention to the safety instructions provided in this manual. The Homeowner's Care and Operation Instructions included here will assure that you have many years of dependable and enjoyable service from your LENNOX product.
TABLE OF CONTENTS
Introduction ......................................Page 2
General Information ..........................Page 2
Gas Controls Access .........................Page 4
Operation / Care of Your Appliance ...Page 4
Variable Flame Adjustment ................Page 5
Maintenance ......................................Page 5
Front Glass Enclosure Panel,
Removal and Installation .................Page 6
Install Grate, Vermiculite
Embers & Logs .................................Page 7
Burner Flame Appearance & Sooting Page 9
Burner Flame Adjustments ................Page 9
Millivolt Appliance Checkout .............Page 10
Electronic Appliance Checkout ..........Page 10
Wiring Diagrams ...............................Page 11
Warranty ...........................................Page 11
Product Reference Information .........Page 11
Accessory Components ....................Page 12
Lighting Instructions – Millivolt ........Page 15
Lighting Instructions – Electronic .....Page 16
Maintenance Schedule ......................Page 17
Troubleshooting Guide – Millivolt .....Page 18
Troubleshooting Guide – Electronic ..Page 18
Replacement Parts List .....................Page 20
INTRODUCTION
The Fireplace models covered in this manual are Direct-Vent sealed combustion gas fi replace heaters designed for residential application. Direct-Vent appliances operate with the com­bustion chamber completely isolated from the indoor environment. All air for combustion is brought in from the outside and exhaust gases are vented through the same direct vent, co-axial (intake/exhaust) vent system.
The Millivolt appliances have a millivolt gas control valve with piezo ignition system provides safe, effi cient operation. If any optional acces­sories which require electrical power are being installed, the electrical power must be provided at the time of appliance installation.
The Electronic appliances have an electronic intermittent pilot system provides safe, effi cient operation. External electrical power is required to operate these appliances.
2
These appliances comply with National Safety Standards and are tested and listed by OMNI­Test Laboratories, Inc. (Report No.116-F-28-5) to ANSI Z21.88a-2003 (in Canada, CSA-2.33a-
2003), and CAN/CGA-2.17-M91 in both USA and Canada, as vented gas fi replace heaters.
The Installation must conform to local codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54-latest edition, or the Natural Gas and Propane Installation Code, CSA B149.1-latest edition. The appliance, when installed, must be electrically grounded in accordance with local codes or, in the absence of local codes, the latest edition of the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1 - latest editions.
GENERAL INFORMATION
Note: Installation and repair should be per­formed by a qualifi ed service person. The appliance should be inspected annually by a qualifi ed professional service technician. More frequent inspections and cleanings may be required due to excessive lint from carpeting, bedding material, etc.
IMPORTANT
It is imperative that the control compartment, burners and circu­lating air passage ways of appli­ance be kept clean. See Mainte­nance instructions on Page 5.
Provide adequate clearances around air open­ings and adequate accessibility clearance for service and proper operation. Never obstruct the front openings of the appliance.
Due to high temperatures the appliance should be located out of traffi c and away from furniture and draperies. Locate furniture and window coverings accordingly.
These fi replaces are designed as supplemen­tal heaters. Therefore, it is advisable to have an alternate heat source when installed in a dwelling.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
These appliances are designed to operate on natural gas or propane gas only. The use of other fuels or combination of fuels will degrade the performance of this system and may be dangerous.
Millivolt Models - BTU Input
Millivolt models come standard with the manu­ally-modulated gas valve; fl ame appearance and heat output can be controlled at the gas valve. The BTU Input for millivolt models is shown in Table 1:
Input (BTU) Manually-Modulated Gas
Valves (millivolt models)
Models Fuel
Type
MPD35ST-NM Nat. Gas
MPD35ST-PM Propane
Input Rate
(BTU / HR)
30,000 high
23,000 low
28,000 high
22,000 low
Table 1
Electronic Models -
Electronic models have a fi xed rate gas valve. The BTU Input for electronic models is shown in Table 2:
Input (BTU) - Fixed Rate
(electronic models)
Models Fuel
Type
MPD35ST-NE Nat. Gas 30,000
MPD35ST-PE
(if fi eld converted)
Pro. Gas 28,000
Input Rate
(BTU / HR)
Table 2
Gas Pressure -
Tables 3, 4 and 5 show the appliances' gas pressure requirements.
Inlet Gas Supply Pressure
(all models)
Fuel # Minimum Maximum
Natural Gas
Propane
5.0" WC
(1.24 kPa)
11.0" WC
(2.74 kPa)
10.5" WC
(2.61 kPa)
13.0" WC
(3.23 kPa)
Table 3
Manifold Gas Supply Pressure
(millivolt models)
Fuel # Low High
Natural
Gas
Propane
(Lo) 2.2" WC
(.55 kPa)
(Lo) 6.3" WC
(1.57 kPa)
(Hi) 3.5" WC
(.87 kPa)
(Hi) 10.0" WC
(2.49 kPa)
Table 4
Manifold Gas Supply Pressure
(electronic models)
Fuel # Fixed
Natural Gas
Propane
Table 5
Test gauge connections are provided on the front of the millivolt gas control valve, identifi ed IN for the inlet and OUT for the manifold side (see Figure 2 on Page 4 ). A 1/8" NPT Test gauge connection is provided at the inlet and outlet (manifold) ports on the electronic gas control valve (see Figure 3 on Page 5 ).
These appliances must be isolated from the gas supply piping system (by closing their individual manual shut-off valve) during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).
These appliances and their individual shut-off valves must be disconnected from the gas supply piping system during any pressure testing of that system at pressures greater
than 1/2 psig (3.5 kPa).
Orifi ce Sizes - Sea Level to High Altitude (All Models)
These appliances are tested and approved for installations at elevations of 0-4500 feet (0-1372 meters) above sea level using the standard burner orifice sizes (marked with an "*" in Table 6 ). At the time of installation, it must be determined if the appliance needs to be derated. Contact your local gas supplier for deration requirements for your area.
Deration - At higher elevations, the amount of BTU fuel value delivered must be reduced by either using gas that has been derated by the gas company or by changing the burner orifi ce to a smaller size as regulated by the local authorities having jurisdiction and by the (USA) National Fuel Gas Code NFPA 54 / ANSI Z223.1 - latest edition or, in Canada, the CAN1-B149.1 and .2 codes - latest edition.
Burner Orifi ce Sizes (all models)
Elevation
Feet (meters)
0-4500
(0-1372)
* Standard size installed at factory
• Part /Cat. Number
Table 6
Natural
Gas
drill size (inches)
#37 (.104")
24M1001 •
3.5" WC
(.87 kPa)
10.0" WC
(2.49 kPa)
*
Propane
Gas
drill size (inches)
1.55
mm
(.061")
42M7901 •
*
Burn-in Period
During the fi rst few fi res of this appliance there will be some odor due to the curing of the paint and burning off of lubricants used in the manufacturing process.
Depending on your use, the burn-in period may take a few hours or a few days.
KEEP YOUR HOUSE WELL VENTILATED DURING THE CURING PROCESS. THE ODOR AND HAZE EMITTED DURING THE CURING PROCESS CAN BE QUITE NOTICEABLE AND MAY SET OFF A SMOKE DETECTOR.
If an optional blower is installed, Do not turn it on during the Burn-In period.
A white fi lm may develop on the glass front during the fi rst few fi res as part of the curing process. The glass should be kept clean during the fi rst two weeks of use to prevent the fi lm from baking on (making it very diffi cult to remove). See Cleaning Glass on Page 5.
WARNING
If the information in this manual is not followed exactly, a fi re or explosion may result causing prop­erty damage, personal injury or loss of life.
WARNING
Failure to comply with the instal­lation and operating instructions provided in this document will result in an improperly installed and operating appliance, voiding its warranty. Any change to this appliance and/or its operating controls is dangerous. Improper installation or use of this appli­ance can cause serious injury or death from fi re, burns, explosion or carbon monoxide poisoning.
IMPORTANT
These appliances must not be connected to a chimney or fl ue serving a separate solid fuel burning appliance.
WARNING
Do not use these appliances if any part has been under water. Immediately call a qualifi ed, professional service technician to inspect the appliances and to replace any parts of the control system and any gas controls which have been under water.
WARNING
Do not attempt to alter or modify the construction of the appli­ance or its components. Any modifi cation or alteration may void the warranty, certifi cation and listings of this unit.
WARNING
Improper installation, adjust­ment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualifi ed installer, service agency or the gas supplier.
WARNING
These fireplaces are vented heaters. Do not burn wood or other material in these appli­ances.
WARNING
This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases, unless a certifi ed kit is used.
WARNING
Do not place clothing or other fl ammable materials on or near this appliance.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
3
WARNING
Carbon monoxide poisoning: early signs of carbon monoxide poisoning are similar to the fl u with headaches, dizziness and/or nausea. If you have these signs, obtain fresh air immediately. Turn off the gas supply to the appliance and have it serviced by a quali­fi ed professional, as it may not be operating correctly.
WARNING
Children and adults should be alerted to the hazards of high surface temperatures. Use cau­tion around the appliance to avoid burns or clothing ignition. Young children should be carefully supervised when they are in the same room as the appliance.
Note: An Optional Screen Heat Guard for the glass is available (see Page 14 for ordering infor­mation).
WARNING
Any safety guard or screen removed for servicing the appli­ance must be replaced prior to operating the appliance.
Gas Control Compartment Access
The gas controls can be found behind the control compartment access panel.
To open the control compartment access panel, actuate the spring-loaded magnetic catches securing the panel. First, depress the outer top right corner of the panel until the catch "pops" the door free. Then, gently pull the door forward until the left top corner "pops" free, allowing the panel to swing out and down to open.
On millivolt systems, the piezo igniter, HI/LO fl ame adjustment knob, and pilot and main gas OFF/ON control knob are located below the glass panel enclosure. The gas valve for electronic systems is also located below the glass enclosure panel. See Figure 1.
To ease door closure, depress the catches to place them in their retracted position, then close the door.
4
OFF/PILOT/ON (gas control knob)
HI/LO (fl ame height
control knob)
OFF/ON Switch
Hinge Pin
Control Compartment Access panel
Piezo Igniter
Figure 1 - Gas Control Compartment Access
OPERATION AND CARE OF YOUR APPLIANCE
The standard controls for appliance operation are located behind the hinged drop-down panel below the appliance front glass enclosure panel (see Figure 1). Optional control switches are also available (see Page 12 - Remote Wall Switch, Remote Control or Wall Thermostat).
Operation of millivolt and electronic gas con­trol systems are different. Before lighting and operating your appliance determine if you have a millivolt or electronic appliance. Familiarize yourself with the gas control valve that your appliance uses. Refer to Figure 1 for access to the gas control valve.
Millivolt Appliances - Appliances with
Millivolt systems will be fi tted with the gas control valve shown in Figure 2.
Electronic Appliances - Appliances with
electronic systems will be fi tted with the electronic valve shown in Figure 3.
Millivolt Appliances -
To light millivolt appliances refer to the detailed lighting instructions found on Page 15 . Millivolt
appliance lighting instructions may also be found on the pull out lighting instruction labels attached to the gas control valve.
Millivolt appliances are fi tted with an OFF/ON Rocker Switch located behind the control compartment access panel, below the appli­ance front glass enclosure panel (see Figure 1 for location). Once the pilot is lit, the OFF/ON rocker switch will control the appliance OFF/ON burner operation. To operate: Toggle the switch between its ON and OFF positions.
If your millivolt appliance is equipped with an optional remote switch kit (wall switch, remote control or wall thermostat) and the pilot is lit, the appliance main burner may be turned on and off using the optional switch. When using an optional remote switch, turn off the standard OFF/ON switch.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Note:The gas supply
line must be installed
in accordance with
building codes by a
qualifi ed installer
approved and/or
licensed as requed
by the locality. In
the Commonwealth
of Massachusetts,
installation must
be performed
by a licensed
Gas Flex Line
Gas Valve
plumber or gas
fi tter.
SIT Millivolt Gas Valve
HI/LO Variable Flame Height Adjustment
T P
HT
TPT H
Pilot Adjustment Screw
Gas Outlet
Terminals
TPTH,TP & TH
Figure 2
Manifold Pressure Tap
P
I
L
O
T
OFF/ON
ON
OFF
(burner)
Note: The piezo igniter and burner OFF/ON switch are located below glass panel (see Figure 1).
Note: To prevent excessive resistance in burner
circuit (which can cause burner operation prob­lems), only one burner control switch should be wired to valve. Therefore, if an optional control switch is installed, the standard Off/On switch and wires should be removed.
Electronic Appliances -
To light electronic appliances refer to the detailed lighting instructions found on Page 16. Elec-
tronic appliance lighting instructions may also be found on the pull out lighting instruction labels attached to the gas control valve.
Inlet Pressure Tap
I
H
L
O
W
Main Gas
Control Knob
OFF/PILOT/ON
TPTH TP TH
HI/LO Variable Flame Height Adjustment
OUT
F
F
O
P
I
L
it
O
T
O
N
Control Knob
OFF/PILOT/ON
IGNITER
IN
Gas Inlet
Main Gas
Once the pilot is lit, if your electronic appliance is equipped with an optional burner control switch kit the appliance main burner may be turned on and off using the optional switch (See optional accessories on Page 12 - Wall Switch, Wall Thermostat Or Remote Control Receiver).
WARNING
Turn off gas and electrical power before servicing the appliance.
IMPORTANT
Do not use abrasive cleaners on glass. Never clean the glass when it is hot.
Honeywell Electronic Gas Valve
Manifold Pressure Port
I G
N I
T ER
Figure 3
C O N T R
NO
O
FFO
L
ON / OFF Switch
Inlet Pressure Port
NI
I PS
Electronic Gas Control Valve
Variable Flame Height Adjustment (Millivolt Appliances only)
1. All Millivolt appliances are equipped with a
variable gas control valve. Flame height for these models may be adjusted through a range between fi xed low and high settings while the appliance is in operation. Adjust the fl ame height as desired after lighting the appliance by rotating the variable adjustment control knob (HI/LO) located on the front of the valve (refer to Figure 2 ).
2. During the fi rst initial burns of these appli-
ances, there will be some odor emitted (see Burn-In Period on Page 3 ).
3. Keep the lower control compartment clean
by vacuuming or brushing at least twice a year. More frequent cleaning may be required due to excessive lint from carpeting, bedding materials, pet hair, etc. It is very important
that the control compartments, burners and circulating air passageways of the appliance are kept clean.
4. Always turn off gas to the pilot (millivolt
appliances) and let the appliance cool down before cleaning. Before re-lighting, refer to the lighting instructions in this manual. Lighting instructions may also be found on the pull out lighting instruction labels attached to the gas control valve.
5. Always keep the appliance area clear and
free from combustible materials, gasoline and other fl ammable liquids.
6. Remember, Millivolt appliances have a continu-
ous burning pilot fl ame. Exercise caution when using products with combustible vapors.
MAINTENANCE
(See Maintenance Schedule, Page 17)
Refer to the maintenance schedule for maintenance tasks, procedures, periodicity and by whom they should be performed. Always verify proper opera­tion of the appliance after servicing.
CAUTION
Wear gloves and safety Glasses for protection while doing required maintenance
.
IMPORTANT
Always verify proper operation after servicing.
Before re-lighting the fi replace, refer to the lighting instructions in this manual. Instruc­tions are also found on pull-out panels located below the glass door in the control compartment.
Inspect Venting System
The appliance and venting system should be thoroughly inspected before initial use and at least annually by a qualifi ed service technician (inspection should include ensuring that exhaust or intake passages are unobstructed and vent components are properly assembled and not damaged). If the venting system is disassembled for any reason, a qualifi ed service technician should follow vent installation instructions for proper reassembly and proper sealing of the venting system components. However, more frequent periodic inspections and cleanings should be performed by the homeowner.
Clean Lower Control Compartment
Keep lower control compartment clean by vacuuming or brushing it out at least twice a year (also clean the air venturi with a brush or wire). More frequent cleaning may be required due to accumulation of lint from carpeting, bedding materials, pet hair, spider webs, etc. It
is very important that control compartments, burners, circulating air passageways and air venturi on the appliance are NOT obstructed in any way.
Cleaning Glass
(see Front Glass Enclosure Panel, Removal and Installation on Page 6) Note: Clean glass
after fi rst two weeks of operation (after Burn-In period is over) and then only when necessary and when the fi replace is cool. Wipe surface with clean, dampened, soft cloth. Follow with dry, soft towel as desired. Take care not to scratch the glass surface.
The viewing glass should be cleaned periodi­cally to remove any build-up caused from the following:
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
• During start-up, it is normal for condensa­tion to form on the inside of the glass (this condensation and fog will usually disappear in a few minutes). The moisture can cause lint, dust and other airborne particles to cling to the glass surface.
• Initial curing of the high temperature paint and burning off of lubricants used in the manufacturing process may result in a fi lm on the glass.
• A white coating may form on the glass as a
result of impurities and minerals in the fuel. It is recommended that the glass be cleaned two or three times during each heating season, depending on the circumstances present. The following cleaning solutions are approved for use to clean glass:
• Non-ammonia based household cleaner
• 50%-50% mix of white vinegar & water
• gas fi replace/stove glass cleaner
Inspect Glass Gasket - Visually inspect the gasket on the backside of the glass enclosure panels. The gasket surface must be clean, free of irregularities and seated fi rmly.
Clean Logs And Burner
Carefully remove the logs (use care when han­dling the fi ber logs, as they become quite fragile after curing). Vacuum out any foreign matter (lint, carbon, etc.) on the burner. Ensure the burner ports are “open.” Remove any carbon deposits from the under side of the logs using a vacuum cleaner, or a soft bristled brush (i.e. paint brush). Note: Improper positioning of logs can create carbon build-up and will alter the performance of the appliance.
Replacing Logs -
If the logs become damaged by accident or improper handling and need replacement, use only the proper replacement logs from manufac­turer (see Page 20 for ordering information).
Re-Install Embers, Logs and Vermiculite
- Carefully follow placement instructions on
Pages 7 to 9 ). All logs should fi t onto cor­responding pins and/or log stoppers. This will ensure a proper fl ame and safe combustion.
Inspect Wiring
Refer to wiring diagrams on Page 11.
WARNING
Label all wires prior to discon­nection when servicing con­trols. Wiring errors can cause improper and dangerous opera­tion. Verify proper operation after servicing.
5
Inspect and clean all wire connections. Ensure that there is no melting or damage. Inspection should include:
• Terminals at the Valve
• OFF/ON Switch
• (Optional Control Switch) Wall Thermostat, Remote Control or Remote Wall Switch Kit
Inspect Burner Flame Appearance
Ensure that the burner flame appearance resembles the fl ame shown in Figure 13 and as described in Flame Appearance and Sooting on Page 9. The Homeowner must contact a quali- fi ed service technician at once if any abnormal condition is observed.
Small Area Paint Touch-up
The fi nish of the appliance is a high qual­ity powdercoat. Only use factory supplied powdercoat paint kit for touch-ups. Paint is available at your local authorized Lennox Hearth Products dealer (cat. no. 90L74). Never attempt to paint a hot fi replace.
Do not attempt to repaint the appliance until the fi nish is completely cured (see Burn-In Period on Page 3 ). If the surface later becomes stained or marred, it may be lightly sanded and touched up with spray paint.
Front Glass Enclosure Panel, Removal and Installation
WARNING
Do not operate appliance with the glass front removed, cracked or broken. Replacement of the glass should be done by a licensed or qualifi ed service technician.
WARNING
Do not attempt to substitute the materials used on this door, or replace cracked or broken glass with any materials other than those provided by the appliance manufacturer.
WARNING
Do not attempt to touch the front enclosure glass with your hands while the fi replace is in use.
WARNING
The glass door of this appli­ance must only be replaced as a complete unit as provided by the manufacturer. Do not attempt to replace broken, cracked or chipped glass separately.
These are direct-vent appliances. They are designed to operate only when the front glass enclosure panel is installed. Generally the front glass enclosure panel should not be removed except to gain access to the components within the fi rebox, and the appliance may only be oper­ated without the front glass enclosure panel in place for very brief periods of time during appliance checkout and adjustment. Note: The fl ame appearance will be diminished while the front glass enclosure panel is removed.
During this appliance checkout and adjust­ment period, a potential safety hazard exists
- EXERCISE EXTREME CAUTION to prevent the occurrence of any burn injuries from the exposed fl ames or hot surfaces. Also note, that while the front glass enclosure panel (or any of the panels) is removed, the fl ame appearance will appear to be smaller than normal.
Lower Compartment Door and Hinge
Top Flange on
Glass Door
Glass Door
Removing Glass Enclosure Panels (see Figure 4)
1. Remove the top louver assembly or radiant
panel by pulling it out and off.
2. Open the control compartment access panel.
by actuating the spring-loaded magnetic catches securing the panel (gently depress the outer top corners of the louvered or radiant panel until the catches "pop" the door free, allowing it to swing out and down to the open position).
3. Locate the two (2) latches at the top of the control compartment. To disengage the two latches from the bottom vee-fl ange of the glass enclosure panel, reach for the handles located towards the back of the latches and pull the handles down toward the front of the appliance.
4. Swing the bottom of the door out and raise it slightly to lift the top fl ange of the door frame away from the appliance.
Installing Glass Enclosure Panels (see Figure 4 )
1. Visually inspect the gasket on the backside of
the panels. The gasket surface must be clean, free of irregularities and seated fi rmly.
2. Position the glass enclosure panel in front of the fi rebox opening at a 45 degree angle and engage the top fl ange over the lip at the top of the fi rebox opening. See Figure 4.
3. Swing the glass enclosure panel down and back. Ensure the gasket seats evenly as the panel draws shut. Engage the Vee-fl ange at the bottom of the panel with the latches and close the latches to secure the panel.
4. Close the bottom control compartment access panel.
WARNING
Handle this glass with extreme care! Tempered glass is suscep­tible to damage – do not scratch or handle roughly while rein­stalling the glass door frame.
6
Bottom Vee-fl ange
Glass Door
Glass Door Latch
Firebox Floor
Figure 4 - INSTALLING GLASS DOOR
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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