Archgard NORTHFIRE 3400 3400-DVTR20N-2 SN 8605 User manual

NORTHFIRE 3400
3400-DVTR20N-2
SN 8605 and up
Direct Vent Top/Rear
Gas Fireplace
For use with natural gas or propane*
Installer: Please leave this manual with the appliance owner for future reference
This appliance may be installed in an
aftermarket permanently located, manufactured
home (USA only) or mobile home, where not
prohibited by local codes.
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 certified kit is used.
*Conversion kit required for Propane use
WARNING: If the information in this manual is
not followed exactly, fire or explosion may result
causing property damage, personal injury or loss
of life.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch; do not use
any phone in your building.
Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
If you cannot reach your gas supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.
USERS’ INSTALLATION
OPERATION AND
MAINTENANCE MANUAL
200-1913
JUNE 2010
7116 Beatty Dr
Mission, BC V2V 6B4
Canada

TABLE OF CONTENTS
Introduction 4
General Information 5
Appliance Description and Dimensions 6
Framing Dimensions 7
Clearance to Combustibles 8
Possible Fireplace Locations 9
Venting Instructions 10-15
Gas Connection 16
Glass Door Removal 17
Log Placement 18
Fan and Valve Diagrams 20
Initial Start-Up 21
Maintenance 22
Troubleshooting 23-24
Servicing 25-29
Replacement Parts List 30
Top/Rear Vent Conversion Instructions 31
Warranty 32
Warranty Registration Card 33

Northfire 3400 4
INTRODUCTION
Thank you for purchasing the Northfire 3400 Direct Vent Built-in Gas Fireplace Heater.
The Northfire 3400 is one of the most advanced gas fireplace heaters on the market. It is
designed using the latest technology and manufactured to the highest quality.
Some of the many features are:
Small Size The Northfire 3400 is compact enough to fit into almost any size
room.
Heater Classification The Northfire 3400 is classified as a heating appliance. Therefore, it
can be operated continuously for zone heating.
High Efficiency The Northfire 3400 has high efficiency, which means that it is less
expensive to operate.
Adjustable Flame The flame aesthetics and heat output can be adjusted to suit the
owner‟s mood and heating needs.
Solid Construction The Northfire 3400 is constructed mainly of satin coated and
galvanized steel for long life and durability.
Convertible The Northfire 3400 is easily convertible between top and rear vent
configurations.
Please read the manual carefully prior to installation and operation of the appliance.
Proper installation, operation and maintenance of the appliance will provide you with
many years of enjoyment.
CAUTION
Due to high temperatures, the appliance should be located out of traffic and away from furniture and
draperies.
Children and adults should be alerted to the hazards of high surface temperature and stay away to avoid
burns or clothing ignition.
Young children should be carefully supervised when they are in the same room as the appliance.
Clothing or other flammable material should not be placed on or near the appliance.
Do not operate with cracked or broken glass. Be careful not to strike or slam the glass.
Any safety screen or guard removed for servicing an appliance must be replaced prior to operating.
Installation and Repair should be done by a qualified service person. The appliance should be inspected
before use and at least annually by a professional service person. More frequent cleaning may be
required due to excessive lint from carpeting, bedding materials, etc. It is imperative that the control
compartments, burners and circulating air passageways of the appliance are kept clean.

Northfire 3400 5
GENERAL INFORMATION
This appliance is listed by LabTest Certification for use in both the United States and Canada. It
is tested and certified to the following US and Canadian gas appliance standards.
- ANSI Z21.88b-2002 / CSA 2.33b-2002, Vented Gas Fireplace Heaters and
- CAN/CGA-2.17-M91, Gas-Fired Appliances for Use at High Altitudes.
Please contact Archgard Industries Ltd., if you have any questions regarding the certification of
this appliance.
APPLIANCE CERTIFICATION
INSTALLATION CODES
This appliance must be installed by a qualified gas appliance installer.
The installation must conform with the local codes or, in the absence of local codes, with the
current National Fuel Gas Code, ANSI Z223.1 or the current CAN?CGA B149, Installation
Codes.
The appliance, when installed, must be electrically grounded in accordance with local codes or,
in absence of local codes, with the National Electrical Code, ANSI/NFPA 70, or the Canadian
Electrical Code, CSA C22.1.
HIGH ALTITUDE INSTALLATION
When installing this appliance beyond 4500 ft. (1372 m) above sea level, the appliance must be
properly de-rated and installed according to local codes; in the absence of local codes, with the
current National Fuel Gas Code, ANSI Z223.1/ NFPA 54, in the US or Installation Code,
CAN/CGA-B149, in Canada.
SPECIFICATIONS
Natural Gas (NG) Propane (LP)
Manifold Pressure 1.6 - 3.5 in. w.c. (0.4 - 0.9 kPa) 6.3 - 10.0 in. w.c. (1.5 - 2.5 kPa)
Minimum Supply Pressure for
Purpose of Input Adjustment
4.5 in. w.c. (1.2 kPa) 11.0 in. w.c. (2.8 kPa)
Orifice Size #45 DMS ( 2.18 mm dia.) #55 DMS ( 1.32 mm dia.)
Nominal Input Rating 13,000 - 20,000 BTU/hr (3.8 -5.8 kW) 15,000 -20,000 BTU/hr (4.4 - 5.8 kW)
Altitude 0 - 4,500 ft. (0 - 1372 m) 0 - 4,500 ft. (0 - 1372 m)
Primary Air Opening ¼in. (6 mm) Full open

Northfire 3400 6
APPLIANCE DESCRIPTION & DIMENSIONS
GAS VALVE
CONVECTION FAN
SPEED CONTROL
TOP LOUVRES
GLASS DOOR
FRONT VIEW
* Except for the vent connector locations, the rear vented and top vented units have the same
physical dimensions.
23 ½”
35 ¾”
TOP VIEW
6 ¾”
15 ¾”
APPLIANCE DIMENSIONS
34 5/8 ”
SIDE VIEW
3½”
5 ¼”
¾”
29”
20½”
27½”
30”
FRONT VIEW
1½”
23 ½”

Northfire 3400 7
FRAMING DIMENSIONS
FRAMING DIMENSIONS
34 3/4”
16”
39 ½”
28”
36 7/16”
56”
34 3/4 ”
*31”
16”
* If more rigidity is required, a stud may be added to the back of the top nailing flange after
the fireplace is installed.
TERMINATION
FRAMING
11”
10”
Please allow 6” sidewall clearance on each side
34 3/4”

Northfire 3400 8
CLEARANCES TO COMBUSTIBLES
Combustible mantle allowed in shaded area.
Mantle extension may be increased 1” (25mm)
for each additional 1” (25mm) increase in
clearance height. 6” (152 mm)
Minimum Height From Top Surround: 6”
Minimum Height From
Bottom of Appliance: 35”
BACK 0” to stand-offs
SIDES 0” to stand-offs
TOP 0” to stand-offs
BOTTOM 0”
ADJACENT SIDE WALL 1” to side of faceplate
MANTLE see diagram
VENT 1” to outside side and bottom surface
2” to outside top surface.
CLEARANCE TO COMBUSTIBLES
PRECAUTIONS
This appliance must be installed by a qualified gas installer and the installation must conform to the
installation codes.
Provide adequate clearance around air openings of the appliance. Never obstruct front openings.
Provide adequate clearances for proper operation and servicing of the appliance.
This appliance must be properly connected to a venting system.
NOTE: Low profile wooden crowns and moldings above the unit are not considered as mantles. I.E. 1” or less
protrusions on the upper mantle facing are acceptable
6” (152 mm)

Northfire 3400 9
B
C
F
D
E
A
ACross Corner
BFlush with Wall
CFlat on Wall Corner
DFlat on Wall
EIsland
FRoom Divider
16 ft Max.
16 ft Max.
POSSIBLE FIREPLACE LOCATIONS
LOCATING GAS FIREPLACE
This appliance must be installed in a location that is free of plumbing, electrical wiring and heating or air
conditioning ducts. Select a location that is accessible for venting. See APPENDIX A. ALLOWABLE
TERMINATION LOCATIONS.
*NOTE: The rear vented gas fireplace can only be located in positions A, B,
C and D.
REFER TO THE VENTING SECTION OF THIS MANUAL FOR
ALLOWABLE VENTING CONFIGURATIONS

Northfire 3400 10
VENTING INSTRUCTIONS
VENTING
The appliance will not function without being connected to a proper venting system.
This appliance may use 4” and 7” gas flex vents with NorthFire 3400 listed vent components, or
Simpson Duravent 4 x 6 5/8 direct vent systems with Simpson Duravent Adaptor (999-DV-SDA).
7” dia. rigid vent may directly replace 7” dia. flex vent in all applications.
For best venting performance using gas flex vent, here are some general venting rules that we
recommend:
1. Use only 4”and 7” diameter 2-ply certified gas flex vent in a co-axial configuration.
2. Maintain a minimum clearance of 1” to the sides and bottom and 2” to the top outside surface
of the vent pipe and combustible material.
3. Observe any local code restrictions, if any, regarding the installation of this type of gas
appliance.
4. Observe the venting chart given in this manual.
5. Use a vent spacer between the inside and outside flex vents at 3 ft intervals.
6. Never slope horizontal running vents downwards.
7. Maintain at least an upward slope of 1” for every 1 ft of horizontal run on the rear vented
models.
8. Terminate the vent with a vent termination supplied by Archgard Industries Ltd.
9. Support horizontal running vents every 3 ft to prevent it from sagging.
10.Wall terminal must be installed a minimum of 12” above grade measured from bottom of
terminal.
VENT TERMINATION
1. See “ALLOWABLE TERMINATION LOCATIONS” diagram (page 13) to establish a suitable vent
termination location.
2. In heavy snowfall areas make sure vent termination is located where it can not be blocked by snow or
snow from snow removal equipment.
3. Locate vent termination away from plants, bushes or any other object on or near the vent termination
that will interfere or obstruct the air flow around it.
4. DO NOT recess vent termination into walls, sidings or planters.
5. Vent terminations located below 7ft from grade level or anywhere it can be a burn hazard to the public,
such as patios and balconies, must be protected with an Archgard-approved termination cage.
6. Always ensure bottom of Vent Terminal is a minimum of 12” above grade.
Maximum horizontal vent length straight out the back or the unit is 3ft.
Maximum of one 45º elbow is allowed.
Maintain 1” vertical rise minimum per foot of horizontal length beyond 6”. ie: no vertical rise is
required for a 6” horizontal vent straight out the back of the fireplace.
For rear vent configurations other than above please refer to the vent charts on page 11 and vent
restrictor chart on page 12..
VENTING FOR REAR VENTED APPLIANCES

Northfire 3400 11
VENTING INSTRUCTIONS
Maintain a minimum of 1” clearance to combus-
tibles on sides and bottom and 2” from top sur-
face of the vent. The gas fireplace is designed
and optimized for majority of the installations
with short vents. With taller vents, the effi-
ciency and flame characteristics will change.
Therefore, an exhaust restrictor plate is provided
by the manufacturer to preserve as much of the
original short vent performances as possible on
taller vent configurations.
Top/Rear Vent Units
Rear Vent Units
Maximum Horizontal run for Rear Vent is 36” from the back of the unit to termination or 16”
with a 45º elbow
Follow the venting instructions as strictly as possible to obtain the best
performance from the appliance.
**Top/Rear Conversion Instructions Pg. 30**

Northfire 3400 12
VENTING INSTRUCTIONS
RESTRICTOR INSTALLATION
(See pg. 14)

Northfire 3400 13
VENTING INSTRUCTIONS
24
Canadian Installations (1) US Installations (2) Canadian Installations (1) US Installations (2) A= Clearance above grade, veranda, porch, deck, or balcony
12 inches (30 cm) 12 inches (30 cm) J= Clearance to non-mechanical air
supply inlet to building or the combustion air inlet o any other appliance
12 inches (30 cm) 9 inches (23 cm)
B= Clearance to window or door that may be opened
12 inches (30 cm) 12 inches (30 cm) K= Clearance to a mechanical
air supply inlet
6 feet (1.83 m) 3 feet (91 cm) above if
within 10 feet (3 m) hori-
zontally
C= Clearance to permanently closed window
* * L= Clearance above paved
sidewalk or paved driveway located on public property
7 feet (2.13 m) + *
D= Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet (61 cm) from the center line of the terminal
* * M= Clearance under veranda,
porch, deck, or balcony
12 inches (30 cm) ++ *
E= Clearance to unventilated soffit * * F= Clearance to outside corner * * G= Clearance to inside corner * * H= Clearance to each side of center line extended above meter/regulator assembly
3 feet (91 cm) within a
height 15 feet (4.5 m) above
the
meter/regulator assembly
*
L= Clearance to service regulator vent outlet
3 feet (91 cm) *
(1) In accordance with the current CSA B149.1, National Gas and Propane Installation Code (2) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code (+) A vent shall not terminate directly above a side walk or paved driveway that is located between two single family dwellings and serves both dwellings (++) Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor. (*) For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, “Clearances shall be in accordance with local installation codes and the requirements of the gas supplier.”
ALLOWABLE TERMINATION LOCATIONS.

Northfire 3400 14
INSTALLATION INSTRUCTIONS Cont...VENTING INSTRUCTIONS Cont...
RESTRICTOR PLACEMENT “FOR ABOVE 4 FOOT VERTICAL RISE VENTED
APPLICATIONS ONLY”
Vertical Venting between Four Feet (4’) and Thirty Feet (30’) re-
quires Restrictor Number 1 as per the Venting Chart on page 12.
Simpson Duravent Archgard System
Archgard System
In the Archgard system the restrictors are placed on the exhaust outlet on the appliance.
Simpson Duravent
With Simpson Duravent locate the restrictor in the exhaust section fitting into the formed lip.
WARNING: These restrictors are only to be installed in the vent system if the vent exceeds 4‟
in vertical height. *See below which restrictor is required. Installing them
under any other circumstances may cause hazardous venting conditions
and may result in personal injury, property damage or death.
NOTE: Vent restrictors are designed to reduce vertical stack action for above 4 feet (4‟), which will reduce the
velocity of incoming combustion air and not adversely affect the standing pilot or the flame of the appli-
ance.
Vertical Venting between Thirty Feet (30’) and up to a maximum
Forty Feet (40’) requires Restrictor Number 2 as per the Venting
Chart on page 12.
Restrictor Placement
40%
60%

Northfire 3400 15
VENTING INSTRUCTIONS Cont...
The rigid vent systems use twist lock connections. The adaptor attached to the unit connects to the approved
venting system. Assemble the vent system using the desired combination to sections and fittings required for
your particular installation. While you are assembling the pipe bear in mind the best visual appearance. Seams
should be aligned and hidden as much as possible. Make sure you twist the mating section all the way to make a
solid connection.
Note: As this system is a sealed system, a high temperature sealing compound must be used to seal the
metal to metal joint.
Vent Pipe Assembly Procedure
Apply a bead of high temperature sealant to both the 4” exhaust and 6 ⅝” intake section of the male pipe. The
female section of the pipe/fitting has four indentations evenly spaced around the pipe. These indentations are
designed to slide over the male section of the pipe and locate into the four entry slots of the male section of pipe.
Twist the female section clockwise a quarter turn to fully lock the sections together.
High Temperature
Sealant
(Mil-Pac / RTV)

Northfire 3400 16
GAS CONNECTIONS
Before connecting the appliance to the gas supply line, double check that the appliance you
have purchased is designed for the gas type you are using. The gas type markings are
located on the certification label and also on the appliance‟s gas valve.
Provide adequate clearance for proper installation and checking of the gas connections.
Have your gas supplier or a qualified gas fitter run a gas supply line into the gas fireplace.
The line must be properly sized and fitted according to the installation codes. Upstream of
the appliance supply connection, the fitter shall provide an easily accessible manual shut-
off valve.
CAUTION: The appliance and its individual shutoff valve must be disconnected from
the gas supply piping system during any pressure testing of that system at
test pressures in excess of 1/2 psig (3.5 kPa). The appliance must be
isolated from the gas supply piping system by closing its individual manual
shutoff 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). Failure to do so will
damage the appliance‟s gas valve. Such damage is not covered by the
manufacturer‟s warranty.
Check for proper gas supply pressure by loosening the set screw on the supply pressure tap
(marked IN) on the gas valve with a small flat tip screw driver and placing a test gauge on
the tap.
The minimum permissible gas supply pressure is 4.5 in. w.c. (1.12 kPa) for natural gas and
11.0 in. w.c. (2.74 kPa) for propane. Maximum gas supply pressure should never exceed
14.0 in. w.c. (3.48 kPa) or 1/2 psi. for both natural gas and propane.
BE SURE TO TIGHTEN THE PRESSURE TAP SET SCREW AFTER CHECKING
THE PRESSURE. CHECK ALL GAS CONNECTIONS FOR GAS LEAKS.
GAS CONNECTION INSTRUCTIONS

Northfire 3400 17
GLASS DOOR INSTRUCTIONS
Removing the Glass Door
Remove the top & bottom louvers (or optional front).
Unhook the door latches found on the bottom of the firebox.
Carefully lift and remove the door.
Place the door at a safe location where it cannot be scratched or damaged.
If the glass door is damaged, it must be replaced with another glass door certified with this
appliance only.
Replacement glass doors are available through your Archgard dealer
See Replacement Parts page 29
Replacing the Glass Door
Check the condition of the glass and the gasket before installing door.
Carefully hook the door onto the tabs on the top of the firebox.
Connect the door latches, at the bottom of the door, and close latches.
Install the top & bottom louvers (or optional front).
If the glass has been damaged contact your dealer and replace the door assembly with a
new assembly provided by your dealer.
WARNING:
- Do not attempt to remove the glass door when the appliance is hot.
- Do not abuse the glass door.
- Do not strike or slam the glass.
- Do not operate this appliance with cracked or broken glass.
- Do not use any substitute materials.
In the event your glass cracks or breaks, it must be replaced by the exact same size and
material. It is made from high temperature ceramic material. See replacement parts list
on Pg. 29 and contact your nearest Archgard Dealer

Northfire 3400 18
LOG PLACEMENT INSTRUCTIONS
PLACEMENT OF LOGSET
Step 1: Place rear right log on pin numbers 7 and 8 with
the left side of the log resting on the pilot shield so as to
allow secondary air to pass under the log.
Step 2: Place rear left log on pin numbers 3 and 4 with the
right side of the log resting on the rear right log so as to al-
low secondary air to pass under the log.
PIN NUMBERS AND LOCATIONS
PIN #1
PIN #2
PIN #3
PIN #6
PIN #7
PIN #8
PIN #9
PIN #10
PIN #4 PIN #5

Northfire 3400 19
Step 6: Place the coals on top of the burner so as not to
block any of the burner ports or the secondary air flow
under the two rear logs
Step 5: Place the center log on pin numbers 5 and 6 with
the larger branch facing forward between the front left and
right logs.
Step 3: Place left front log on pin numbers 1 and 2 as
shown.
Step 4: Place right front log on pin numbers 9 and 10 as
shown.
REPLACEMENT LOGS
310-63400-1 Right Rear Log
310-63400-2 Left Rear Log
310-63400-3 Left Front Log
310-63400-4 Right Front Log
310-63400-5 Middle Chunk Log
310-0020 Black Embers
310-63400 Complete Log Set
WARNING : Do not place the logs branches in any configuration other than the one
shown, a fire, explosion or excessive carbon monoxide (CO) may
result, causing property damage, personal injury or loss of life.

Northfire 3400 20
FAN & VALVE WIRING DIAGRAM/INSTRUCTIONS
ELECTRICAL CONNECTIONS (for optional convection fan kit 999-DV-FK only)
Install the fan first. Remove the lower louvers and gently place the bottom front lip of the
blower mounting bracket into the opening. Slide the blower assembly into the bottom of the
fireplace. Rotate the blower into position. Be careful not to damage the fan blades. The fan
blades will now face towards you. Line up the holes on fan bracket to the mounting bracket at
the bottom of the fireplace. Place a screw at each of the three holes and tighten.
Run 120VAC power line through the left side of the fireplace and into the bottom of the gas
fireplace.
Be sure to connect a grounding wire to the side of gas fireplace. Use any screw hole on the
side for this purpose.
Slide the thermal snap switch into the fork like bracket underneath the left side of the firebox.
Neatly tie down and tuck the wires down at the bottom and to the back of the fireplace.
CAUTION: Do not allow any wires to touch the bottom of the firebox. Otherwise, the wires
will melt and short-out.
Screw the speed controller bracket to the bottom left sidewall of the gas fireplace.
VALVE CONNECTIONS
PILOT
REMOTE WALL
OPTIONAL
THERMOSTAT
THERMOPI
SPARK
THERMOCOUP
PILOT
SPARKE
WIRING DIAGRAM SPEED CONTROL
LINE (BLACK) CONVECTION BLOWER
GROUND (GREEN)
NEUTRAL
SIDE OF
120 VAC
BLACK BLACK
WHITE
BLACK