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Page 12

Venting

General Requirements

These instructions should be used as a guideline and do
not supersede local codes in any way. 
Install vent accord-
ing to local codes, these instructions, the current National
Fuel Gas Code (ANSI-Z223.1) in the USA or the current
standards of CAN/CGA-B149.1 and -B149.2 in Canada.

This gas fireplace is equipped with a concentric vent col-
lar for ease of installation. The concentric vent pipe will
bring in outdoor air for combustion and will remove ex-
haust gases. Vent terminations are ordered separately.

This Lennox gas fireplace is for use only with Lennox
approved concentric vent pipe: rigid vent pipe in vertical
venting applications, and rigid or flexible vent pipe in
horizontal applications. Each vent must be terminated
using a Lennox vent termination. Approved venting kits
and components are listed on page 26 of this manual.

NOTE - The vent terminations are certified for use
with this unit and must be installed without modifica-
tion.

WARNING

All vent system connections/joints must be properly
sealed using only Lennox MILL-PAC BLACK HIGH
TEMPERATURE SEALANT, Catalog Number 10K81.
Failure to properly seal the vent system could allow
carbon monoxide leakage resulting in injury or death.

Sealing and Joining Rigid Vent Pipe

Apply only Lennox MILL-PAC BLACK HIGH TEM-
PERATURE SEALANT 
(Catalog number 10K81)
around outside of inner and outer vent collars before
assembling vent to collar. Outer pipe must also be se-
cured to outer collar using three sheet metal screws.
See figure 11. Sealant must be applied to all rigid pipe
joints and the outer pipe must be secured with three
sheet metal screws.

SECURING RIGID VENT PIPE TO COLLAR

USE THREE SCREWS TO

SECURE OUTER VENT

PIPE TO OUTER COLLAR

APPLY ONLY LENNOX MILL-PAC BLACK HIGH
TEMPERATURE SEALANT (Catalog No. 10K81)

AND SLIDE RIGID PIPE OVER INNER AND

OUTER COLLARS.

NOTE - The bottom part of

the outer pipe is omitted in

order to show the detail of

the inner pipe.

RIGID VENT

PIPE

FIGURE 11

Sealing and Connecting Flexible Vent Pipe

Flexible vent pipe is packaged and shipped in its con-
tracted state. When installing flexible vent pipe, its length
may be expanded to twice its contracted size. You should
expect to extend a 3 ft. section of flexible pipe up to 6 ft.

IMPORTANT

Under no circumstances, may separate sections of
concentric flexible vent pipe be joined together.

When flexible vent pipe is used, both inner and outer
pipes should be secured to the fireplace concentric
collar and to the vent termination using only Lennox
MILL-PAC BLACK HIGH TEMPERATURE SEALANT
(Catalog number 10K81) and metal gear clamps as
shown in figure 12.

SECURING VENT PIPE TO COLLAR

FLEXVENT

OUTER

COLLAR

GEAR

CLAMPS

HOLES PROVIDE

SCREWDRIVER ACCESS
FOR TIGHTENING INNER

GEAR CLAMP.

APPLY ONLY LENNOX MILL-PAC

BLACK HIGH TEMPERATURE
SEALANT (Catalog No. 10K81)

AND SLIDE FLEXIBLE PIPE OVER

INNER AND OUTER COLLARS.

NOTE - Part of the outer

pipe is pulled away to show

the detail of the inner pipe.

FIGURE 12

Summary of Contents for DR3025

Page 1: ...on Clearances 5 Framing 6 Installation 6 Venting 12 Gas Piping 21 Unit Start up 21 Adjustments 23 Service 24 Wiring Diagram Millivolt Gas Valves 24 Wiring Diagram Electronic Gas Valves 25 Repair Parts...

Page 2: ...ed firebox lining forced air fan assemblies a wall thermostat for use with vented gas fireplace heater models only and hand held remote ON OFF controls are available as options Refer to table 1 for mo...

Page 3: ...rical components if applicable are protected from water When 120 volt power is installed appliance must be elec trically grounded in accordance with local codes In addi tion in the United States insta...

Page 4: ...his includes restrictions on horizontal and ver tical vent lengths and vent termination locations 2 Center appliance between two wall studs if possible to simplify venting 3 If optional blower is used...

Page 5: ...10 254 MANTEL 8 203 MANTEL 6 152 MANTEL 4 102 MANTEL 4 102 14 356 12 305 10 254 2 51 MANTEL TOP OF APPLIANCE 6 152 NOTE Eyebrow shown as positioned in louvered front model The eyebrow position in the...

Page 6: ...he appliance Joints between the finished wall and the fireplace edges can only be sealed with a 300_F 149_C minimum sealant Non combustible materials can be used to cover the gap between the combustib...

Page 7: ...DT DTH DR DRH 3025 LOG PLACEMENT Log Stamping Part Number Log Number 1 195 2 196 3 197 4 198 Lennox Part Number Lennox Part Number for entire log set 18L76 19L60 19L61 19L62 19L63 4 2 1 3 2 3 4 1 FIG...

Page 8: ...DT DTH DR DRH 3530 LOG PLACEMENT Log Stamping Part Number Log Number 1 199 2 1910 3 1911 4 1912 2 3 4 1 Lennox Part Number Lennox Part Number for entire log set 18L77 19L64 19L65 21L10 21L11 4 2 1 3 F...

Page 9: ...LOG PLACEMENT Log Stamping Part Number Log Number 1 1919 2 1918 3 1920 4 1923 Lennox Part Number Lennox Part Number for entire log set 18L78 19L67 19L66 19L68 19L69 5 6 1921 19L70 1922 19L71 2 3 4 1...

Page 10: ...CEMENT Log Stamping Part Number Log Number 1 1924 2 1925 3 1920 4 1922 Lennox Part Number 19L72 19L73 19L68 19L71 5 6 1923 19L69 1921 19L70 1926 19L74 7 4 2 1 3 6 5 7 2 3 1 5 4 6 7 Lennox Part Number...

Page 11: ...g to figure 37 Electronic Ignition Units All electronic ignition units require 120 volt wiring Install wiring according to fig ure 38 When 120 volt electrical power is applied the ap pliance must be e...

Page 12: ...collars before assembling vent to collar Outer pipe must also be se cured to outer collar using three sheet metal screws See figure 11 Sealant must be applied to all rigid pipe joints and the outer pi...

Page 13: ...ESTRICTOR TOP FLUE OUTLET FIGURE 13 1 Provide a firestop spacer any time vent pipe must pass through a combustible floor ceiling or wall See figure 14 Refer to listing on page 26 for catalog num bers...

Page 14: ...2 ft min 6 ft max 3 ft min 9 ft max 4 ft min 12 ft max 5 ft min 15 ft max 17 ft max 6 ft min H V1 V2 V1 V2 40 ft Maximum H 17 ft Maximum Firestop Spacer must be used any time vent pipe passes through...

Page 15: ...t min 4 ft max 3 ft min 6 ft max 4 ft min 8 ft max 40 ft max 8 ft max H2 H1 V Firestop Spacer must be used any time vent pipe passes through combustible floor or ceiling or wall FIGURE 20 VERTICAL VEN...

Page 16: ...use only with Lennox approved concentric vent pipe either rigid or flexible vent pipe may be used when horizontally venting the fireplace through a side wall DT DTH Applications See figures 23 24 or...

Page 17: ...max 15 ft max V1 H1 H2 6 ft min 17 ft max 20 ft max 17 ft max Firestop Spacer must be used any time vent pipe passes through combustible floor or ceiling or wall RIGID VENT PIPE SHOWN FLEXIBLE VENT P...

Page 18: ...top Spacer must be used any time vent pipe passes through combustible floor or ceiling or wall RIGID VENT PIPE SHOWN FLEXIBLE VENT PIPE MAY ALSO BE USED NOTE THE LONGEST LENGTH OF FLEX AVAILABLE IS 48...

Page 19: ...MINATION AT TOP 3 in 76mm 1 in 25mm FIRESTOP SPACER AT INSIDE WALL SURFACE FACEPLATE INTEGRAL TO VENT TERMINATION VENT TERMINATION The termination faceplate shall not be recessed into a wall or siding...

Page 20: ...vice regulator vent outlet 3 ft 915mm in the United States and 6 ft 1 8m in Canada minimum J Clearance to non mechanical air supply inlet to building or the combustion air inlet to any other appliance...

Page 21: ...32 LEAK CHECK After gas piping is completed carefully check all piping connections factory and field for gas leaks Use a leak detecting solution or other preferred means CAUTION Some soaps used for l...

Page 22: ...ob counterclock wise to ON 9 Restore electrical power to appliance if applicable 10 Turn ON the burner switch if applicable or set the thermostat to the desired setting if applicable 11 Close the bott...

Page 23: ...roved for elevations of 0 4500 feet 0 1372 meters When installing this unit at an elevation above 4500 feet 1372 meters consult the local authorities having jurisdiction ELECTRICAL NOTE These checks a...

Page 24: ...e and outside glass surfaces using a mild deter gent water solution and a soft cloth DO NOT use abrasive cleansers which might scratch the high temperature glass surface DO NOT clean glass when surfac...

Page 25: ...Unit mounted ON OFF switch is available as a factory installed option or can be ordered separately and field installed Wall mounted ON OFF switch is field provided Thermostat is available as a factor...

Page 26: ...it 97K75 45 Grate Kit 96K16 30 4 Piece Polished Brass Trim Assembly 96K17 35 4 Piece Polished Brass Trim Assembly Catalog Number Description 96K18 40 4 Piece Polished Brass Trim Assembly 96K19 45 4 Pi...

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