DYNAVENT
WINDOW WALL FURNACE
DIRECT-VENT PROPANE/LP GAS HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
DNV25PB
DNV40PB
50 60 70 80 90
SOLID STATE IGNITION
50 60 70 80 90
25,000 and 40,000 BTU/Hr “B” Model Furnaces
WARNING: If the information in these instructions 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 flammable vapors
and liquids in the vicinity of this or any other appliance.
FOR YOUR SAFETY
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.
WARNING: Improper installation, adjustment,
alteration, service, or
maintenance can cause
injury or property damage. Refer to this manual
for correct installation
and operational procedures. For assistance or
additional information
consult a qualified installer, service agency,
or the gas supplier.
— Installation and service must be performed
by a qualified installer,
service agency, or the
gas supplier.
This appliance may be installed in an aftermarket*, permanently located, manufactured (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.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference.
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
SAFETY
INFORMATION
WARNINGS
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate,
or service this furnace. Improper
use of this furnace can cause serious injury or death from burns, fire,
explosion, electrical shock, and
carbon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning resemble the
flu, with headaches, dizziness, and/or nausea. If you have these signs, the furnace may
not be working properly. Get fresh air at
once! Have furnace serviced. Some people
are more affected by carbon monoxide than
others. These include pregnant women,
people with heart or lung disease or anemia,
those under the influence of alcohol, and
those at high altitudes.
Propane/LP Gas: Propane/LP gas is odor-
less. An odor-making agent is added to propane/LP gas. The odor helps you detect a
propane/LP gas leak. However, the odor added
to propane/LP gas can fade. Propane/LP gas
may be present even though no odor exists.
Make certain you read and understand all
warnings. Keep this manual for reference. It
is your guide to safe and proper operation of
this furnace.
WARNING: Any change to
this heater or its controls can
be dangerous.
Due to high temperatures, the
appliance should be located out
of traffic and away from furniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the furnace.
Carefully supervise young children when they are in the same
room with furnace.
Surface of furnace becomes very
hot when running furnace. Keep
children and adults away from hot
surface to avoid burns or clothing
ignition. Furnace will remain hot
for a time after shutdown. Allow
surface to cool before touching.
Turn off furnace and unplug and let
cool before servicing. Unless you
need gas supply for testing, shut
off equipment shutoff valve before
servicing. Only a qualified service
person should service and repair
furnace and venting system.
Replace any safety screen or
guard removed for servicing before operating furnace.
You must keep control compartments, burners, and circulating
air passages clean. More frequent
cleaning may be needed due to
excessive lint and dust from carpeting, bedding material, etc.
Turn off the gas valve and unplug
before cleaning furnace.
1. A qualified service person must install
furnace.
2. 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.
3. Use only propane/LP gas. Do not convert furnace to use different fuel type.
4. If you smell gas
• Shut off gas supply.
• 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.
5. Do not block the flow of combustion
air (outside air) or heated air (room air)
to the furnace.
6. This furnace must have fresh air for proper
operation. If not, poor fuel combustion and
improper venting of flue gases will result.
Carbon monoxide poisoning from backedup flue gases could occur. The State of
California lists carbon monoxide as a reproductive toxin under Proposition 65.
7. Never install the furnace
• in a recreational vehicle
• in an alcove
• on an inside wall
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
• behind a door or where an open door
would block normal air flow
8. Provide the following minimum furnace clearances from furnace front
cover to combustibles (as viewed from
the front of furnace): Below Front
Cover: 6 inches; Adjoining Wall:
12 inches; Above Front Cover:
12 inches; Front: 8 feet
9. Do not obstruct the flow of combustion and ventilation air in any way . Provide adequate clearances around air
openings into the combustion chamber
along with adequate accessibility clearance for servicing and proper operation.
10. Provide the following minimum furnace
clearances from furnace cabinet (portion
of cabinet extending into outside air, as
viewed from the rear of furnace):
Cabinet Back: 36 inches
Cabinet Sides: 6 inches
Cabinet Bottom: Must be high enough
off the ground to prevent snow, water,
leaves, or any other objects from blocking cabinet vents.
11. Always follow lighting instructions.
Never attempt to light burner with a
match or butane torch.
12. Do not run furnace
• where flammable liquids or vapors
are used or stored
• under dusty conditions
15. Do not use furnace as a cooking device.
16. Do not alter furnace or its controls. Any
change may create a safety hazard.
19. Do not use furnace if any part has been
under water. Immediately call a qualified service person to inspect the furnace and to replace any part of the control system and any gas control which
has been under water.
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201839
OWNER’S MANUAL
LOCAL CODES UNPACKING
Install and use furnace with care. Follow all
local codes. In the absence of local codes, use
the latest edition of the following:
• National Fuel Gas Code ANS Z223.1,
also known as NFPA 54 * (USA)
• National Electric Code ANS/NFPA 70*
• CAN/CGA-B149[.1 or .2] Installation
Codes** (Canada).
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
**Available from:
Standards Council of Canada
350 Sparks Street
Ottawa, Ontario K1R 7S8
This furnace must be grounded when installed. Follow all local codes. In the absence of local codes, refer to the National
Electrical Code ANS/NFPA No. 70 (U.S.A.)
or CSA C22.1 Canadian Electrical Code,
Part I (Canada).
The installation must conform with local
codes, in the absence of local codes, with the
National Fuel Gas Code, ANS Z223.1/Canadian Installation Code, CAN/CGA B149.
When installing furnace in a manufactured
(mobile) home, follow the Manufactured
Home Construction and Safety Standard,
Title 24CFR, Part 3280 (formerly the Federal Standard for Mobile Home Construction and Safety, Title 24, part 280; 1975).
When such a standard is not applicable,
follow the Standard for Manufactured Home
Installations, 1982 (Manufactured Home
Sites, Communities, and Set-Ups), ANS
A225.1/NFPA 501A.
In Canada, install furnace in accordance with
Standard CSA Z240.4 - Gas Equipped Recreational Vehicles and Mobile Housing and
any applicable local codes and regulations.
Appliance input ratings are based on sea
level operation and need not be changed for
operation up to 2,000 feet elevation. For
operation at elevations above 2,000 feet,
manufactured to specified deration conditions for Canada and the United States.
1. Remove furnace from carton.
2. Remove all protective packaging applied to furnace for shipment.
3. Remove the following items from carton:
• Hardware package containing four
large screws, two small screws, and
thermostat mounting plate
• Hardware package (thermostat and
two screws)
• Equipment shutoff valve
If any of these items are missing,
promptly inform dealer where you
bought furnace.
4. Check furnace for any shipping damage.
If furnace is damaged, promptly inform
dealer where you bought furnace.
SPECIFICATIONS
*Rated Heating Input (BTU/Hr) 25,000 40,000
Thermal Output Capacity
(average loss calculation) 18,750 Btu/Hr 30,000 Btu/Hr
Type Gas Propane/LP Only Propane/LP Only
Ignition Hot Surface Ignitor Hot Surface Ignitor
Operating Amps 1.5 2
Volts/Cycles 120/60 120/60
Main Burner 1 2
Pressure Regulator Setting 10" W.C. 10" W.C.
Inlet Connection 3/8 NPT 3/8 NPT
Inlet Gas Pressure (in. of water)*
Maximum 13" 13"
Minimum 11" 11"
Dimensions, Inches (H x W x D)
Furnace 15 3/32 x 16 1/8 x 23 5/8 15 3/32 x 21 3/4 x 23 5/8
Weight (pounds)
Furnace 53 71
Shipping 65 98
* For purposes of input adjustment.
PRODUCT
FEATURES
HOT SURFACE IGNITOR
This furnace has an electronic ignitor. There
is no standing pilot. No matches or batteries
are required.
THERMOSTATIC HEAT
CONTROL
The thermostat is temperature sensitive. It
automatically turns the furnace on and off.
This results in the greatest heating comfort.
This can also result in lower gas bills.
LIMIT SWITCH
The limit switch shuts off the gas to the main
burner if the furnace becomes too hot to
operate safely.
DNV25PB DNV40PB
201839
3
®
6" Minimum
Adjacent
Side
Wall
Ceiling
Finished Floor, Carpet, Tile, etc.
12"
Minimum
12" Minimum
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
INSTALLATION
Mounting hardware needed to mount furnace into wall is included with the furnace.
No venting material is needed. You must
furnish tools and all gas piping from the gas
source to the furnace inlet.
WARNING: A qualified service person must install furnace.
Have service person inspect furnace before use and at least annually. Follow all local codes.
NOTICE: This furnace must be
electrically grounded. Follow all
local codes. In the absence of
local codes, follow the
Electric Code, ANS/NFPA 70
(U.S.) or Canadian Electrical Code
Part I-CSA C22.1 (Canada).
CHECK GAS TYPE
Use only propane/LP gas. If your gas supply is not propane/LP gas, do not install
furnace. Call dealer where you bought furnace for proper type furnace.
INSTALLATION ITEMS
Before installing furnace, make sure you
have all items below:
• electric drill
• drill bits
• Phillips screwdriver
• hammer
• pipe wrench
• stud locator or small finishing nails
• equipment shutoff valve (supplied)
• test gauge connection (see Figure 15,
page 10)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• ground joint union
• sediment trap
• tee joint
National
LOCATING FURNACE
This furnace is designed to be mounted in a
wall that is 4 to 18 inches thick. You can also
mount furnace in a window.
WARNING: Do not install furnace in interior wall of building. You
must install furnace in exterior wall
of building. Rear of furnace must
extend into open, outside air. This
lets poisonous exhaust gases ventilate to the outdoors.
WARNING: Turn off electrical
circuits that pass through the wall
where you are going to install the
furnace.
WARNING: Maintain the minimum clearances shown in Figure
1. If you can, provide greater clearances from floor, ceiling, and
joining wall.
WARNING: Due to high temperatures, never install the furnace:
• in an inside wall
• in a recreation vehicle
• in a window recessed in a thick
wall (creating an alcove)
• in an alcove
• behind a door or where an open
door would block normal air flow
• as a fireplace insert
• in high traffic areas
• near furniture or draperies
• in windy or drafty areas
CAUTION: If you install the
furnace in a home garage, locate
furnace where moving vehicle will
not hit it.
For convenience and efficiency, install furnace:
• where there is easy access for operation,
inspection, and service
• in a central location, near an electrical
outlet
• where there is adequate clearance around
vents outside
Before installing furnace, inspect the wall,
floor, and outside areas. Make sure there are
no pipes, wiring, or anything else that would
interfere with furnace installation. If you are
installing thermostat in a wall, make sure
there are no pipes or wiring in the hollow
wall above the furnace. The thermostat wires
will pass through this wall from the attic.
Minimum Clearances
Provide the following minimum clearances
from furnace front cover to combustibles
(as viewed from the front of furnace, see
Figure 1):
Below Front Cover: 6 inches
Above Front Cover: 12 inches
Adjoining Wall: 12 inches
Front: 8 feet
Figure 1 - Mounting Clearances as Viewed
from Front of Furnace
The clearance between the cabinet and the
wall it passes through is 0 inches.
Provide the following minimum clearances
from furnace cabinet (portion of cabinet
extending into outside air, as viewed from
the rear of furnace) to obstructions:
Cabinet Back: 36 inches
Cabinet Sides: 6 inches
Cabinet Bottom: Must be high enough
off the ground to prevent snow, water,
leaves, or any other objects from blocking vents.
4
201839
OWNER’S MANUAL
INSTALLATION
(Continued)
CREATING WALL OPENING
AND MOUNTING FURNACE
Remove furnace front cover. Remove the
two screws at the lower edges of front cover.
Lift front cover away.
Installing in Normal Frame Wall
The 25,000 BTU/Hr model is designed to fit
between two wall studs set at 16 inch on
center. The 40,000 BTU/Hr model will not
fit between wall studs. Follow the steps
below to install.
1. Turn off electrical circuits that pass
through mounting wall. Make sure
there are no pipes or electrical wires in
area you intend to cut.
2. Use stud locator or small finishing nail
to find wall studs. When you locate
studs, drive a small finishing nail into
each stud. This provides a visual reference for stud locations.
3. 25,000 BTU/Hr Model: Cut an opening in wall between the two studs. Make
opening 141/4" wide by 135/8" high
(see Figure 2).
must install furnace horizontally. Do
not install furnace vertically.
40,000 BTU/Hr Model: Cut a 20
wide by 14 3/8" high opening in wall (see
Figure 2). Start your cut right next to
stud you are going to anchor cabinet to.
Cut across wall and through the next
stud. Stop cut at proper width.
IMPORTANT:
horizontally . Do not install furnace vertically .
4. 25,000 BTU/Hr Model: Mark screw
locations on wall (see Figure 2). Make
sure screws will anchor into studs.
Make sure screw locations match screw
holes on cabinet flange.
40,000 BTU/Hr Model: Mark screw
locations on wall (see Figure 2). Make
sure screws on one side will anchor into
studs. Screws on other side will only
anchor in wall material. Make sure
screw locations match screw holes on
IMPORTANT:
Yo u
5
/16"
Y ou must install furnace
cabinet flange.
5. 25,000 BTU/Hr Model: Use a propersized drill bit. Drill holes through wall
and into studs at marked locations.
40,000 BTU/Hr Model: Use a proper-
sized drill bit. On wall stud side of
opening, drill holes through wall and
into studs at marked locations. On other
side, drill holes through wall material.
6. Insert furnace into opening. Do this
from inside the room. Secure furnace
to wall with four large screws provided.
7. On outside of wall, caulk opening between the cabinet and the rough edges
of opening.
Approx.
Screw
Locations
Wall Studs
1
/4"
14
Wall
Opening
13
5
/8"
Approx.
Screw
Locations
25,000 BTU/Hr Model
Wall Studs
Approx.
Screw
Locations
20 5/16"
Wall Opening
14
3
/8"
40,000 BTU/Hr Model
Figure 2 - Wall Openings and Screw
Locations
Installing in Masonry Wall
You can mount both models in a masonry
wall. Follow the steps below to install.
1. Cut opening in wall. Make opening 14 1/4"
wide by 13 5/8" high for 25,000 BTU/Hr
models. Make opening 20 5/16" wide by
14 3/8" high for 40,000 BTU/Hr models.
IMPORTANT:
furnace horizontally . Do not install furnace vertically.
You must install
2. Secure furnace to wall with toggle bolts
or hook bolts set in mortar.
3. Insert furnace into opening. Do this
from inside the room. Secure furnace
to wall with toggle bolts or hook bolts.
4. On outside of wall, caulk opening between the cabinet and the rough edges
of opening. You can also use mortar to
seal opening.
INSTALLING THERMOSTAT
WARNING: Unplug furnace
before installing thermostat.
Mount the thermostat directly on the furnace or on a wall in another part of the room.
If you have solid or masonry walls, mount
the thermostat on the furnace.
Mounting Thermostat to Furnace
1. Unplug furnace.
2. Locate red and white thermostat wires
coming out of side of furnace. These
wires are labeled “Thermostat.”
3. Cut thermostat wires to desired length.
4. Route thermostat wires through slot/
hole in side of thermostat mounting
plate. Then route wires through 5/8"
diameter hole in center of plate (see
Figure 4, page 6).
5. Connect thermostat wires to the two
terminal screws on back of thermostat
(see Figure 3). Connect red wire to “R”
terminal. Connect white wire to “W”
terminal.
White Wire
W
R
Red Wire
Figure 3 - Connecting Thermostat Wires
to Thermostat
Continued
201839
5
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
INSTALLATION
(Continued)
6. Attach thermostat to thermostat mounting plate with screws provided (see Figure 4).
IMPORTANT:
plate position in Figure 4. Correctly
position mounting plate for your model
furnace.
7. Insert thermostat mounting plate between wall and cabinet flange. Line up
top notch on mounting plate with top
screw on flange (see Figure 5).
IMPORTANT:
BTU/Hr model mounts on right side of
furnace (see Figure 5). Thermostat for
40,000 BTU/Hr model mounts on left
side of furnace (see Figure 5).
8. Insert screw in cabinet flange and thermostat mounting plate and tighten firmly .
IMPORT ANT :
wires do not touch combustion chamber.
.2
.3
.4
OFF
.5
.7
50 60 70 80 90
SOLID STATE IGNITION
50 60 70 80 90
50 60 70 80 90
SOLID STATE IGNITION
50 60 70 80 90
Figure 4 - Attaching Thermostat to
Thermostat Mounting Plate
1.0
40,000 BTU/Hr Models
OFF
25,000 BTU/Hr Models
Note mounting
Thermostat for 25,000
Make sure thermostat
.2
.3
.4
.5
.7
1.0
00
0
0 00
00
00
00000000000 00000000
00 00 00 00 00
40,000 BTU/Hr Models
50 60 70 80 90
S
O
L
ID
S
T
A
T
E
IG
N
IT
IO
50 60 70 80 90
N
25,000 BTU/Hr Models
Figure 5 - Inserting Thermostat Mounting
Plate Between Wall and Cabinet Flange
Locating Thermostat on Wall
1. Locate thermostat 4 1/2 to 5 feet above
the floor on an inside wall away from
any heat sources. The thermostat needs
to sense average room temperature.
Avoid the following:
HOT SPOTS
Concealed pipes or ducts
Fireplaces
Registers
TV sets and radios
Lamps or direct sunlight
Kitchen
COLD SPOTS
Concealed pipes or ducts
Stairwells (drafts) or doors (drafts)
Unheated rooms on other side of wall
DEAD SPOTS
Behind doors
Corners and alcoves
2. Before installing thermostat, inspect the
wall, floor, and attic areas. Make sure
there are no pipes, wiring, or anything
else that would interfere with installing thermostat. Do not mount thermostat to stud. If there are any obstructions, choose a new location.
3. Provide two 18-gauge insulated stranded
wires for the thermostat wire. Also provide two wire nuts, and two wall anchors.
There is a red and a white thermostat wire
coming from the furnace. The extra thermostat wires you furnish attach to these
wires. Make sure you furnish a red and a
white wire. This will insure correct
hookup. Purchase enough thermostat wire
to go from the furnace to the thermostat
location. Do not cut and splice this wire.
The thermostat wire must be unbroken.
Routing Thermostat Cable
All wiring must meet local codes. The following instructions cover routing the wire
through the attic. You can run wiring from
a basement or crawl space.
1. Unplug furnace.
2. Before drilling hole in wall, drive a small
finishing nail through ceiling directly
above thermostat location. Pull nail out
and push a small stiff wire through hole.
This helps you locate thermostat mounting location when in attic.
3. In attic, locate stiff wire. Drill 1/2" hole
in center of ceiling wall plate next to
stiff wire. Remove wire.
4. Probe through drilled hole in wall plate
with a stiff wire to make sure there are
no pipes, wiring, or anything else
blocking the way for thermostat wires.
If you find blockage, choose new location for thermostat.
5. Drill a 1/2" hole through the wall at
thermostat mounting location.
6. From attic, feed thermostat wires
through hole in ceiling plate until wires
reach thermostat location.
7. Make a small hook with a piece of stiff
wire. Run wire hook through 1/2" hole
in wall. Hook thermostat wires. Pull
wires through hole in wall. Make sure
6" of wires stick out.
8. Drive a small finishing nail in ceiling
above furnace.
25,000 BTU/Hr Model - Drive nail
above right side of furnace.
40,000 BTU/Hr Model - Drive nail
above left side of furnace.
Pull nail out and push a small stiff wire
through hole. This helps you locate wire
routing location when in attic.
9. Repeat steps 3 and 4 above.
6
201839
OWNER’S MANUAL
INSTALLATION
(Continued)
10. Feed thermostat wires from attic to
furnace through 1/2" hole in ceiling
wall plate.
11. Connect thermostat wires from attic to
thermostat wires on furnace. Connect
red wires together, then connect white
wires together. Use wire nuts to make
connections.
thermostat wires do not touch combustion chamber.
Mounting the Thermostat to Wall
1. Connect thermostat wires to the two
terminal screws on back of thermostat
(see Figure 6). Connect red wire to “R”
terminal. Connect white wire to “W”
terminal.
2. Push any excess wire back through hole
in wall and plug hole with insulation
to prevent drafts. Drafts affect the thermostat operation.
3. Use thermostat base to mark mounting
screw locations.
4. Drill proper-sized holes for wall anchors.
5. Attach thermostat to wall using screws
provided (see Figure 7).
White Wire
IMPORTANT:
W
Make sure
Wall
Anchors
.2
.3
.4
OFF
.5
.7
1.0
50 60 70 80 90
SOLID STATE IGNITION
50 60 70 80 90
Figure 7 - Mounting Thermostat to Wall
CONNECTING TO GAS
SUPPLY
WARNING: A qualified service person must connect furnace to gas supply. Follow all
local codes.
WARNING: Unplug furnace
before connecting to gas supply.
CAUTION: Use only new,
black iron or steel pipe. Copper
tubing may be acceptable in certain areas. Check local codes.
Use pipe large enough in diameter to allow proper gas volume
to furnace. If pipe is too small,
undue loss of pressure will occur. Refer to chart on page 9.
All piping must comply with local codes
and ordinances or with the National Fuel
Gas Code (ANS Z223.1 NFPA No. 54),
whichever applies.
You can connect furnace to gas supply at
front of furnace (inside) or at rear of furnace
(outside).
Connecting Furnace to Gas
Supply at Front of Furnace
1. Locate gas inlet pipe on lower, right
front of furnace (see Figure 8).
2. Connect 3/8" NPT pipe or nipple to gas
inlet pipe (see Figure 8). See Provid-
ing Gas Piping to Furnace, pages 9 and
10, for correct gas pipe installation.
3/8" NPT
Pipe or
Nipple
Figure 8 - Connecting Gas from Inside of
Room
Gas Inlet Pipe
R
Red Wire
Figure 6 - Connecting Thermostat Wires
to Thermostat
201839
CAUTION: Lightly apply pipe
joint sealant to male threads before connecting. Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
Continued
7
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
INSTALLATION
(Continued)
Connecting Furnace to Gas
Supply at Rear of Furnace
1. Remove the two screws in back of furnace cabinet located by the exhaust
vent(s) (see Figures 9 and 10).
2. Remove two screws on front lower
flange that attach furnace flange to furnace cabinet flange (see Figure 11).
Note:
40,000 BTU/Hr model has a bottom shield (see parts list, page 22, for
location). Removing two screws will
detach bottom shield.
3. Slide furnace out of furnace cabinet.
4. Locate gas inlet pipe on lower, right
front of furnace.
5. 40,000 BTU/Hr Model Only: Remove
screw holding gas inlet pipe clamp to
furnace.
6. Disconnect gas inlet pipe from 3/8"
manifold elbow. Turn gas inlet pipe
counter-clockwise to disconnect (see
Figure 12).
7. Rotate the 3/8" manifold elbow 90° so
the opening is pointing downward (see
Figure 12).
8. Locate knockout plug in furnace cabinet. Knockout plug is in lower left rear
of furnace cabinet (as viewed from rear,
see Figure 13). Remove knockout plug.
9. Slide furnace back into furnace cabinet. Make sure exhaust tube gaskets are
in place. Make sure exhaust and intake
vent tubes extend into vent caps on
back of cabinet. Replace two screws by
exhaust vent(s) removed in step 1.
10. 25,000 BTU/Hr Model: Replace two
screws removed in step 2. Attach furnace flange and furnace cabinet lower
flange together.
40,000 BTU/Hr Model: Place bottom
shield back in place. Replace two
screws removed in step 2. Attach bottom shield, furnace flange, and furnace
cabinet lower flange together.
11. Run 3/8" pipe or nipple through knockout hole. Connect 3/8" pipe or nipple
to manifold elbow (see Figure 14). See
Providing Gas Piping to Furnace,
pages 9 and 10 for correct gas pipe installation.
12. Check connections for gas leak.
WARNING: Never use an open
flame to check for a leak. Apply a
mixture of liquid soap and water
to all joints. Bubbles forming show
a leak. Correct all leaks at once.
13. Caulk around pipe or nipple. This prevents cold air entering knockout hole.
Figure 9 - Locations of Screws in Back of
Furnace Cabinet (25,000 BTU/Hr Model)
Figure 10 - Locations of Screws in Back
of Furnace Cabinet (40,000 BTU/Hr Model)
Furnace
Furnace
Cabinet
Flange
Figure 11 - Removing Screws on Lower
Flange (40,000 BTU/Hr Model Shown)
Flange
Remove Screw,
40,000 BTU/Hr
Model Only
Gas Inlet
Pipe
Manifold Elbow
Figure 12 - Disconnecting Gas Inlet Pipe
(40,000 BTU/Hr Model Shown)
Knockout Plug
Figure 13 - Location of Knockout Plug
3/8" NPT
Figure 14 - Inserting Pipe through
Knockout Hole
8
201839
OWNER’S MANUAL
INSTALLATION
(Continued)
Providing Gas Piping to Furnace
You must provide gas piping from gas source to furnace. The gas piping must be in a vertical
position where it connects to the furnace. This prevents interference with front cover
installation.
Consult your local gas company for proper routing of the gas lines.
Pipe size is determined by the length of pipe from the gas source to the furnace and the total
BTU load on the gas source.
Add the total BTUs required for all appliances connected to the gas source including this furnace.
Divide this number by 2500. This will give you the approximate cubic feet per hour needed.
Example:
40,000 BTU/Hr
+ 15,000 BTU/Hr for other gas appliances
55,000 BTU/Hr total
55,000 ÷ 2500 = 22
Locate 22 or higher on chart below.
According to the chart below, you should use 40 feet or less of 3/8" pipe, 125 feet
or less of 1/2" pipe, etc...
MINIMUM
IRON PIPE
SIZE LENGTH OF PIPE (FEET)
10 20 30 40 50 60 70 80 90 100 125 150 175 200
3/8" 47 32 26 22 19 18 16 15 14 13 12 11 10 —
1/2" 87 61 48 42 37 33 30 28 26 25 22 20 18 17
3/4" 184 126 100 86 76 69 63 59 55 52 48 42 39 36
1" 344 232 189 162 142 129 119 112 106 99 86 79 73 66
1
/4" 696 484 391 331 291 265 245 232 212 202 182 166 149 139
1
11/2" 1060 729 590 504 444 404 371 351 324 305 272 252 232 212
2" 2022 1392 1094 961 842 762 696 656 616 576 517 470 430 404
21/2" 3182 2188 1790 1524 1326 1226 1127 1060 994 928 829 749 969 649
3" 5635 3911 3116 2718 2387 2154 1989 1856 1724 1657 1458 1326 1226 1127
4" 11602 7956 6431 5503 4906 4508 4110 3845 3580 3381 2983 2718 2519 2320
IMPORTANT:
Check gas line pressure at gas meter before connecting furnace to gas line. Gas
line pressure must be no less than 11 inches of water and no greater than 13 inches of water.
Gas pressures and input to the burners must not exceed the rated input and pressure shown on
the rating plate. For propane/LP gas, manifold pressure should be 10 inches of water. For
elevations above 2000 feet, reduce rating 4% for each 1000 feet above sea level (U.S.A. only).
CAUTION: Never connect heater directly to the propane/LP supply.
This heater requires an external regulator (not supplied). Install the
external regulator between the heater and propane/LP supply.
The installer must supply an external regulator. The external regulator will reduce incoming
gas pressure. You must reduce incoming gas pressure to between 11 and 14 inches of water.
If you do not reduce incoming gas pressure, heater regulator damage could occur. Install
external regulator with the vent pointing down. Pointing the vent down protects it from
freezing rain or sleet.
201839
9
Continued
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
INSTALLATION
(Continued)
Installation must include an equipment
shutoff valve (supplied), ground joint union,
plugged 1/8" NPT tap, and a sediment trap.
Locate NPT tap within reach for test gauge
hook up. NPT tap must be upstream from
furnace (see Figure 15).
Install an equipment shutoff valve in an
accessible location. The equipment shutoff
valve is for turning on or shutting off the gas
to the appliance.
Apply pipe joint sealant lightly to male
threads. Prevent excess sealant from going
into pipe. Excess sealant in pipe could result
in clogged furnace valves.
Equipment
Shutoff Valve
Test Gauge
Connection
To Gas Supply
3" Min.
Sediment
Trap
To Gas Supply
CAUTION: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.
Install sediment trap in supply line as shown
in Figure 15. Locate sediment trap where it
is within reach for cleaning. A sediment trap
traps moisture and contaminants. This keeps
them from going into furnace controls. If
sediment trap is not installed or is installed
wrong, furnace may not run properly.
IMPORTANT:
trapped matter will not freeze. Install sediment trap in a vertical run of pipe. If gas
piping enters furnace from rear (outside),
you must locate sediment trap in crawl space
(see Figure 15). If you install furnace in
structure with slab foundation, you must
install gas piping to front of furnace (inside)
(see Figure 15).
Gas Piping
Entering
Furnace
Front
(Inside)
Locate sediment trap where
Gas Piping
Entering
Furnace
Rear
(Inside)
Equipment
Shutoff
Valve
CHECKING GAS
CONNECTIONS
WARNING: Test all gas piping and connections for leaks
after installation or servicing.
Correct all leaks at once.
WARNING: Never use an open
flame to check for a leak. Apply a
mixture of liquid soap and water
to all joints. Bubbles forming show
a leak. Correct all leaks at once.
Pressure Testing Gas Supply
Piping System
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance
main gas valve (control valve) and
equipment shutoff valve from gas
supply piping system. Pressures in
excess of 1/2 psig (3.5 kPa) will
damage heater regulator.
2. Cap off open end of gas pipe where
equipment shutoff valve was connected.
3. Pressurize supply piping system by either
using compressed air or opening main gas
valve located on or near gas meter.
4. Check all joints of gas supply piping
system. Apply mixture of liquid soap
and water to gas joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect furnace and equipment
shutoff valve to gas supply. Check reconnected fittings for leaks.
Slab Floor Installation
Figure 15 - Gas Connection
3" Min.
Test Gauge
Connection
Crawl Space Installation
Sediment
Trap
10
201839
OWNER’S MANUAL
O
INSTALLATION
(Continued)
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close
2. Pressurize supply piping system by either
3. Check all joints from gas meter to
4. Correct all leaks at once.
Pressure Testing Furnace Gas
Connections
1. Open
2. Open main gas valve located on or near
3. Make sure control knob of furnace is
4. Check all joints from
5. Correct all leaks at once.
6. Turn on furnace (see Operating Fur-
7. Turn off furnace (see To Turn Off Gas
equipment
shutoff valve (see Fig-
ure 16).
using compressed air or opening main gas
valve located on or near gas meter.
equipment shutoff valve. Apply mixture of liquid soap and water to gas
joints. Bubbles forming show a leak.
equipment
shutoff valve (see Fig-
ure 16).
gas meter.
in the OFF position.
equipment
shutoff
valve to gas inlet pipe. Apply mixture
of liquid soap and water to gas joints.
Bubbles forming show a leak.
nace, pages 12 and 13). Check the rest
of the internal joints for leaks.
to Furnace, page 13).
O
On Position
POSI
CONNECTING TO
ELECTRICAL SUPPLY
IMPORTANT:
connecting electricity to furnace. In the absence of local codes, refer to the latest edition of the National Electrical Code ANS/
NFPA No. 70. If you are not familiar with
wiring codes, have a qualified electrician do
the wiring.
It is best to plug furnace into a separate and
permanent electrical line circuit.
1. Supply a 120-volt, 60-cycle, grounded
outlet at furnace location.
2. The furnace has a three-pronged
(grounded) plug. Use only a grounded,
three-prong outlet.
IMPORTANT:
rigid or semi-rigid conduit or metallic
sheathe cable. When using a semi-rigid or
metallic sheathe cable, the installer must
terminate the supply wire in the terminal
box opening.
Performance Check
Plug furnace into three-pronged outlet. If
ignitor remains on after main burner ignition or if the valve chatters, you may have
reversed polarity.
1. Unplug furnace.
2. Turn off electricity to outlet.
3. Reverse 120-volt connections inside
outlet.
4. Turn on electricity to outlet.
5. Plug in furnace. Ignitor should turn off
after main burner ignites. If ignitor does
not turn off, or if valve continues to
chatter, turn off furnace and unplug.
Call a qualified service person.
Follow all local codes when
Some local codes require
ATTACHING CABINET
FRONT COVER
CAUTION: Do not operate furnace with front cover removed or
mounted wrong. If front cover is
mounted wrong, you cannot secure it to cabinet with screws.
1. Hook top of front cover over top cabinet flange.
2. Secure the sides of front cover to lower
sides of furnace cabinet with two
screws provided (see Figure 17).
IMPORTANT:
nace from furnace cabinet during installation. You must correctly install furnace
within cabinet. If not, front cover will not
properly attach to cabinet. Make sure gaskets for intake and exhaust tubes are in
place. Make sure intake and exhaust tubes
extend into vent caps on cabinet back and
are secured with screws. Make sure you
secured flange on bottom of furnace to flange
on bottom front of cabinet.
Figure 17 - Attaching Front Cover to
Cabinet
You may have removed fur-
P
Off Position
Figure 16 - Equipment Shutoff Valve
201839
11
®
O
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
OPERATING
FURNACE
WARNING: Furnace burner,
combustion chamber, and exhaust port are very hot during
operation. Keep children and
adults away from hot surfaces to
avoid burns and clothing ignition. Carefully supervise young
children when they are in the
same room as furnace. Furnace
will remain hot for a time after
shutdown. Let surface cool before touching.
WARNING: Do not operate
furnace with front cover removed.
Unsafe operation could result.
CAUTION: Do not block circulating air openings in the louver of the front cover. This is
necessary for furnace to operate
properly.
NOTICE: If operating furnace for
the first time, a slight odor will
occur. This odor will go away
after a few hours of operation.
FOR YOUR SAFETY
READ BEFORE
LIGHTING
WARNING: If you do not follow these instructions exactly, a
fire or explosion may result causing property damage, personal
injury, or loss of life.
A. This appliance does not have a pilot.
It is equipped with an ignition device
which automatically lights the
burner . Do not try to light the burner
by hand.
B. BEFORE OPERATING smell all
around the appliance area for gas. Be
sure to smell next to the floor because
some gas is heavier than air and will
settle on the floor.
WHAT TO DO IF YOU SMELL
GAS
• Do not try to light any appliance.
• Do not touch any electric 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.
C. Use only your hand to turn the
handle on the equipment shutoff
valve. Never use tools. If the handle
will not turn by hand, don’t try to
repair it. Call a qualified service technician. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately
call a qualified service technician to
inspect the appliance and to replace
any part of the control system and
any gas control which has been under water.
OPERATING
INSTRUCTIONS
WARNING: Always follow
lighting instructions. Never attempt to light burner with a match
or butane torch.
1. STOP! Read the safety information,
column 1.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the
furnace.
4. T urn equipment shutoff valv e clockwise to OFF position (see
Figure 18).
5. Wait f ive (5) minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety information, column 1. If you don’t
smell gas, go to next step.
6. Turn equipment shutoff valve counterclockwise to ON position
(see Figure 18).
7. This furnace is equipped with an ignition device which automatically
lights the burner. Do not try to light
the burner by hand.
8. Plug in furnace.
9. Set thermostat to desired setting. If
thermostat is set above room temperature, the blower will come on.
10. Allow approximately 45 seconds for
ignition to occur. When ignition occurs, the glo-bar will stay on for a
short period of time. The flame sensing probe will sense the burner flame
and shut off glo-bar.
If ignition does not occur within 22
seconds, the ignition control will attempt to light burner three times. This
will take about two minutes. If ignition does not occur, the ignition control will lock out the glo-bar and valve
circuit. Air in the gas line or a short
gas interruption will prevent furnace
from igniting. If this happens, turn
thermostat off and wait 5 minutes.
T urn the thermostat back on. The fur nace will try to ignite again.
11. If the furnace still does not ignite, follow instructions To Turn Off Gas to
Furnace, page 13. Call a qualified
service person. Do not attempt to restart furnace.
O
On Position
POSI
P
Off Position
Figure 18 - Equipment Shutoff Valve
12
201839
OWNER’S MANUAL
OPERATING
FURNACE
(Continued)
TO TURN OFF GAS
TO FURNACE
1. Set thermostat to lowest setting
2. Turn equipment gas valve clockwise
to OFF position. Do not force
equipment gas valve.
3. Unplug furnace if service is to be per-
formed.
To Shut Down Furnace for an
Extended Period of Time
1. Turn equipment gas valve clockwise
to OFF position. Do not
force equipment gas valve.
2. Set thermostat on OFF.
CAUTION: Do not try to adjust
heating levels by using the equipment shutoff valve.
THERMOSTAT
CONTROL
OPERATION
The thermostat responds to the room temperature. When the room temperature drops
below the thermostat setting, the thermostat
turns the furnace burner and blower on.
When the room temperature goes above the
thermostat setting, the thermostat turns the
furnace burner off. The blower will continue to blow about two to three minutes
after the burner goes out. The thermostat
keeps the room at a constant temperature.
INSPECTING
BURNER FLAME
To observe burner flame, remove furnace
front cover. Remove the two screws at the
lower edges of front cover. Lift front cover
away. Locate viewing window on front of
combustion chamber. You can see burner
flame through this window.
Correct Burner Flame: Blue flame with
well-defined burner ports.
Incorrect Burner Flame: Yellow or lazy
flame without well-defined burner ports.
If burner flame is incorrect, shut off furnace
and contact a qualified service person.
Correct Flame
Pattern
Figure 19 - Burner Flame Patterns
Incorrect Flame
Pattern
NORMAL
OPERATING
SEQUENCE
1. When the room temperature drops below
the thermostat setting, the thermostat calls
for heat. A 24-volt circuit is completed
through the time delay relay coil. After
three to five seconds, the contacts in the
relay close. The blowers come on.
2. One motor drives both the combustion
air blower and the circulating room air
blower. The combustion air blower
draws air from outside through the intake air vent. This air discharges into
the combustion chamber. The combustion air blower then forces the combustion products out of the exhaust tube(s).
The Combustion air blower is sealed
so that air does not pass between it and
the circulating room air blower.
3. When the blower motor reaches 75% of
normal r.p.m. (three to five seconds), air
from the blower turns on the
microswitch. When the microswitch
activates, the electrical circuit is completed through the limit switch to the
control module. The glo bar begins to
glow. In about 15 seconds, the glo bar
becomes hot enough to ignite the burner.
4. Another 24-volt circuit is completed
through the module to the main gas
valve. The valve opens. Gas passes
through the valve to the main burner.
The gas is ignited by the glo bar.
5. After the main burner ignites, the flame
detector senses the presence of flame.
This opens the circuit to the glo bar.
The glo bar shuts down.
6. The circulating room air blower pulls
return air in from the living area. This
air is heated as it flows past the combustion chamber. The heated air is then
blown out into the room.
7. When the room temperature rises above
the thermostat setting, the circuit to the
valve opens and the burner shuts off.
8. The blower continues to run about two to
three minutes until the time delay relay
coil cools. When the coil cools, the circuit
to the motor opens. The blower shuts off.
LIMIT SWITCH
WARNING: Do not operate
furnace without a properly working limit switch.
The limit switch will turn off the gas to the
main burner if the furnace becomes too hot.
When this happens, the main burner will go
out and the blower will continue to run for
two to three minutes. This usually happens
when circulating air is partially or completely blocked.
Occasional cycling of the limit switch is not
bad. This indicates safe operation. Limit
switch cycling will most likely occur on
warm days. If this happens too often or for
a long period of time, the circulating air
system should be thoroughly cleaned by a
qualified service person.
If the circulating air system is cleaned and
the limit switch continues to shut down the
furnace, the limit switch is defective. A
defective limit switch cannot be repaired. It
must be replaced. For safety reasons, never
operate the furnace without a limit switch.
201839
13
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
CLEANING AND
MAINTENANCE
WARNING: Turn off and unplug furnace and let cool before
cleaning. Turn equipment shutoff
valve to OFF position. Only a
qualified service person should
service and repair furnace.
WARNING: Keep furnace clear
and free from combustible materials, gasoline, and other flammable vapors and liquids.
CAUTION: You must keep
control areas, burner, and circulating air passageways of furnace
clean. Inspect these areas of furnace before each use. Have furnace inspected yearly by a qualified service person. Furnace may
need more frequent cleaning due
to excessive lint from carpeting,
bedding material, pet hair, etc.
CAUTION: Label all wiring
prior to disconnection when servicing controls. Wiring errors can
cause improper and dangerous
operation.
Verify proper operation after servicing.
CABINET
Air Passageways
• Use a vacuum cleaner or pressurized air
to clean.
Exterior
• Use a soft cloth dampened with a mild
soap and water mixture. Wipe cabinet
and front cover to remove dust.
• Use a vacuum cleaner to remove dust
from front cover louvers.
EXHAUST AND INTAKE VENTS
Make sure the exhaust and intake vents are
not blocked. The intake combustion air and
the exhaust gases must be expelled to the
outside. Have a qualified service person clean
dirt and loose debris from vents annually.
GASKETS
Inspect all gaskets. If any gaskets show
signs of leakage or damage, replace them.
Safe operation of furnace depends on all
gaskets being tight.
FRONT COVER
Remove anything that may be blocking the
air to the louvers of the front cover.
COMBUSTION CHAMBER
AND MAIN BURNER
Check flame pattern of main burner often
(see Inspecting Burner Flame, page 13).
Have combustion chamber and main burner
cleaned if you have run the furnace with a
high yellow flame. Incomplete combustion
from lack of air causes the yellow flame.
This deposits soot inside the combustion
chamber and on the burner. Contact a qualified service person to clean combustion
chamber and main burner.
OUTSIDE VENT CAPS
Inspect outside vent caps for obstructions or
soot. If soot is found, do not use furnace.
Contact a qualified service person to clean
furnace.
14
201839
OWNER’S MANUAL
TROUBLESHOOTING
Note:
For additional help, visit DESA
International’s technical service web site
at www.desatech.com.
Note:
All troubleshooting items are listed in
order of operation.
OBSERVED PROBLEM
No heat
POSSIBLE CAUSE
1. Thermostat off
2. Gas supply
3. Electrical connections and power
4. Motor
5. Malfunctioning microswitch
6. Gas valve
WARNING: Turn off and unplug furnace and let cool before servicing. Unless you need gas supply for testing, shut off equipment shutoff
valve before servicing. Only a qualified service person should service
and repair furnace.
REMEDY
1. Check to be sure thermostat is calling for heat.
Wire to thermostat could be off terminal
2. Be sure equipment gas valve is in the open position (level or parallel to gas line)
3. Be sure all electrical connections are secure
4. Motor must be operating at top speed before
burner will come on. If blower is not operating
at top speed, check voltage supply (minimum
100 volts A.C.). If voltage supply is okay, check
for defective motor
5. Be sure the microswitch is sailing in far enough
to open the solenoid valve and to energize the
ignition control. If the switch is not sailing in,
clean any dust or dirt from the actuator pin. Other
reasons for the switch not sailing in are
A.Insufficient blower speed - Slow motor due to
faulty motor or lint and dust accumulation on
the blower wheels or restriction of return air to
the furnace
B. Faulty microswitch - Replace switch if cir-
cuit to ignition control is not completed when
switch is manually engaged. Switch should
also be replaced if blower motor running at
top speed fails to engage switch within six or
seven seconds.
bustion chamber must be pulled out. Follow
steps 1, 2, 3, 9 and 10 on page 8 to remove
combustion chamber
6. Within 20 seconds after motor reaches 75% of
its r.p.m. and microswitch engages, check the
following:
A. Voltage at valve - If current is present but
valve is not opening, check wire connections
B. If wire connections okay - Replace valve
C. No voltage at valve - Check circuit completion
through microswitch and limit switch as well
as wiring and wire connections. If no defects
are found, see Ignition Failures, page 16
Note:
T o service switch, com-
201839
www.desatech.com
15
Continued
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
No heat (continued)
POSSIBLE CAUSE
7. Blower not operating
8. Short cycling (motor goes on and off)
REMEDY
7. A. Check power supply to furnace
B. Check electrical connections at furnace
C. W ith thermostat points closed, check for cir-
cuit completion at motor. If voltage is present,
replace motor. If no voltage is present at motor, check for:
• 24 volts on secondary coil or transformer. If
no voltage, replace transformer.
• If 24 volt transformer okay, check for circuit
completion across contacts on time delay
relay. Allow three to five seconds for contact to close
• If circuit across contacts okay, check conti-
nuity of wiring in motor circuit
8. A. Check thermostat. Contacts should remain
closed. If contacts are breaking:
• Check thermostat anticipator setting. It
should be between .75 and 1.0
• If anticipator setting okay, check amp draw
across thermostat. If amp draw exceeds .65,
check amp draw across coil of valve and time
delay relay.
bar, there is a momentary surge of approximately 4.0 amps
• If amp draw is within limits, check for shorts
in thermostat wiring
• If wiring is okay, replace thermostat
Note:
On initial operation of glo
IGNITION FAILURES
WARNINGS:
• Never connect unit or ignition
circuit to 230 volts.
• Never operate unit with glo bar
touching burner or any other
ground. Damage to ignition
control will occur.
• Be sure sensor probe never
touches glo bar. This will damage ignition control.
• If the ignition control is defective, it must be replaced. It is
not field-repairable.
CAUTION: Do not attempt to
repair the ignition control. This
may alter it and cause it to operate incorrectly.
The electronic system is made up of two
parts: the ignition control and the glo bar.
The ignition control is the brain of the electronic system. It has several functions:
1. When the blower reaches full r.p.m., a
24-volt circuit is completed to the ignition control. (Check across yellow
and orange wires.)
2. The red and blue wires at the ignition
control are the 120-volt input for the
glo-bar circuit. When the 24-volt circuit is completed, the ignition control
will complete the 120-volt circuit to the
glo bar and it begins to glow. (Check
this circuit across the two white wires
at the ignition control.)
3. After approximately 20 seconds, a 24volt circuit is completed through the ignition control to the gas valve. (This circuit is checked from brown wire at ig-
www.desatech.com
16
nition control to a neutral ground.) This
circuit opens the valve, gas flows to the
burner and is ignited by the heat from
the glo bar.
4. When the burner flame is established,
the sensing probe will sense the presence of burner flame and open the globar circuit. The glo bar will then stop
glowing.
It is important to determine the type of
problem being experienced. Then the proper
checkout procedure can be made. The following is a list of problems, how to identify
in which area the problem is located, and
how to correct it.
Note:
Glo bar remains on.
201839
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
Ignition failures
POSSIBLE CAUSE
1. Glo bar will not glow - with blower running and microswitch engaged
2. Glo bar glows but burner will not
come on
3. Glo bar operating and gas valve opening but burner will not light
4. If the ignitor remains on after main
burner ignition or the valve chatters, reverse the 120-volt A.C. connections at
the wall receptacle
www.desatech.com
OWNER’S MANUAL
REMEDY
1. Check the following:
A. Check for 24 volts A.C. across yellow and
orange wires at ignition control. If no voltage, check microswitch and limit switch for
circuit completion as well as wiring and wiring connections
B. V oltage present across yellow and orange wires,
check for 120-volt input to ignition control
across red and blue wires. If no voltage, check
wiring all the way back to power supply
C. 120 volts present across red and blue wires,
check for 120 volts across the two white wires
at ignition control. If no voltage, replace ignition control
D. Voltage present across the two white wires,
check wiring and wire connections to glo bar
E. If wiring and wire connections okay, replace
glo bar. (Glo bar broken)
2. A. Check for voltage (24 volts A.C.) at valve
40 seconds after glo bar begins to glow. If
voltage present but valve not opening, replace
valve
B. If no voltage at valve, check brown wire at
ignition control for continuity and good connection
C. If wire and wire connections okay, replace
ignition control
3. A. Check gas flow through burner. If no gas is
coming through burner, check for obstruction in gas line, main burner orifice, or main
burner
B. If thermostat okay, check for 24 volt A.C.
circuit completion across yellow and orange
wires at ignition control. If no voltage, check
for circuit completion through limit switch
and microswitch
C. If voltage is present at ignition control across
yellow and orange wires yet burner continues to go off, replace ignition control
4. A. If polarity is okay yet burner continues to go
off, check thermostat to be sure it is still completing the valve circuit. If not, check for
excessive amp draw in valve circuit
B. If thermostat okay, check for 24 volt A.C.
circuit completion across yellow and orange
wires at ignition control. If no voltage, check
for circuit completion through limit switch
and microswitch
C. Voltage present at ignition control across
yellow and orange wires yet burner continues to go off, replace ignition control
Continued
201839
17
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
Ignition failures
Excessive noise
Main burner will not cycle off
Furnace will not operate
POSSIBLE CAUSE
5. Burner cycles off and glo bar comes on
immediately, check the following:
1. Blower out of balance
2. Motor hums
1. Thermostat setting
2. Gas valve stuck open
1. Wiring connections or shorts
REMEDY
5. A. Check flame sensing probe. Be sure
probe is positioned in the burner
flame and glowing cherry red. Check
wire and wire connections at probe
and ignition control
B. If wire and wire connections okay,
check for voltage across brown and
orange wires at ignition control. If
no voltage, replace ignition control
C. If voltage present, check wiring and
wire connections at valve
D. If wire and wire connections okay,
replace valve
1. Replace blower
2. Replace motor
1. Check thermostat
2. Check gas valve. If stuck open, replace.
Do not attempt to repair valve!
1. Check all wiring to assure proper con-
nection or detect possible shorts
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18
201839
OWNER’S MANUAL
WIRING DIAGRAMS
Limit
Switch
Orange
Blue
Yellow
Brown
Gas Valve
Yellow
White
Limit
Switch
★★
Brown
Brown
Gas Valve
Brown
White
Black
Green
115 V.A.C.
▲White
Transformer
White
Junction
Box
Black
White
Black
Thermostat
Red
White
Brown
Motor
White
Terminal Block
370 V.A.C.
Capacitor
5 MFD
Brown
Brown
Green
Black
Note:
Black
▲
♦
Time Delay
Relay
Red Black
Figure 20 - Wiring Diagram (25,000 BTU/Hr Model)
Black
Green
115 V.A.C.
▲White
Transformer
Junction
Box
Black
White
Red
Thermostat
White
White
Brown
Motor
White
Terminal Block
Black
370 V.A.C.
White
White
Green
Black
Capacitor
5 MFD
Brown
Note:
Red Black
Time Delay
Relay
Black
Blue
Sail Switch
Sail Switch
Orange
Green
Brown
Yellow
White
Green
Brown
Yellow
White
Black
♦Black
White
White
Black
♦Black
White
White
1
2
3
4
5
6
7
Probe
1
2
3
4
5
6
7
Probe
Ignition
Control
Board
(Open)
Glo-Bar
Ignition
Control
Board
(Open)
Glo-Bar
REPLACEMENT
PARTS
Note:
Use only original replacement parts.
This will protect your warranty coverage for
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If
they can’t supply original replacement part(s),
call DESA International’s Technical Service
Department at 1-800-323-5190. When calling DESA International, have ready:
• your name
• your address
• model and serial number of your furnace
• how furnace was malfunctioning
• type of gas used (propane/LP or natural gas)
• purchase date
Usually, we will ask you to return the defec-
tive part to the factory.
PARTS NOT UNDER
WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), either contact your nearest Parts
Central (see below) or call DESA
International’s Parts Department at 1-800972-7879. When calling DESA International, have ready:
• model number of your furnace
• the replacement part number
★
▲
♦
Figure 21 - Wiring Diagram (40,000 BTU/Hr Model)
201839
19
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
SERVICE HINTS
When Gas Pressure Is Too Low
• glo-bar glows, but burner will not ignite
When Gas Quality Is Bad
• burner will not stay lit
• burner will produce flames and soot
You may feel your gas pressure is too low or
gas quality is bad. If so, contact your local
gas supplier.
PARTS CENTRALS
Howard Industries
8855 Washington Blvd.
Culver City, CA 90232
310-837-9100
www.howind.com
Victor Manufacturing
42 Rumsey Road
E. Hartford, CT 06108-1164
NY, NJ, DE, PA, MD
1-800-243-9360
203-289-4223
Fax: 1-800-274-2004
www.fwwebb.com
Controlled Engineering
299 Roosevelt Road
Glen Ellyn, IL 60137-5618
630-469-7300
www.controld.com
Portable Heater Parts
342 N. Country Road 400E
Valparaiso, IN 46383-9704
1-800-362-6951
219-462-7441
www.portableheaterparts.com
sales@portableheaterparts.com
techservice@portableheaterparts.com
F B D
1349 Adams Street
Bowling Green, KY 42103-3414
1-800-654-8534
(270) 846-1199
Fax: 1-800-846-0090
franktalk@aol.com
TECHNICAL
SERVICE
You may have further questions about installation, operation, or troubleshooting. If
so, contact DESA International’s Technical
Service Department at 1-800-323-5190.
You can also visit DESA International’s
technical service web site at
www.desatech.com.
These Parts Centrals are privately owned businesses. They have agreed to support our
customer’s needs by providing original replacement parts and accessories. For certain parts,
some Parts Centrals may refer you to a dealer in your area. When calling a Parts Central, ask
for the Parts Department.
Master Parts Dist.
1251 Mound Ave. NW
Grand Rapids, MI 49504-2672
1-800-446-1446
616-791-0505
Fax: 616-791-8270
ww.nbmc.com
Washer Equipment Co.
1715 Main Street
Kansas City, MO 64108-2195
KS, MO, AR
816-842-3911
Controls, Inc.
6820 Glenwood Ave.
Raleigh, NC 27612-7133
NC, SC, VA, MD
1-800-334-5886
919-787-2242
Tarantin Tank Co.
P.O. Box 6129
Freehold, NJ 07728-6129
1-800-922-0724
908-780-9340
www.tarantin.com
East Coast Energy
707 Broadway
W. Long Branch, NJ 07764-1542
1-800-755-8809
732-870-8809
www.njplaza.com/ecep
Dayton Hardware
P. O. Box 275
North Dayton Station
Dayton, OH 45404-0275
Ohio Only - 1-800-762-3426
937-258-3721
Central Air Supply
424 North Rockwell
Oklahoma City, OK 73127-6119
405-495-0014
Halco Enterprises
208 Carter Drive, Unit 21
West Chester, PA 19382-4500
1-800-368-0803
610-430-7717
www.halcoenterprises.com
Laportes Parts & Service
2444 N 5th Street
Hartsville, SC 29550-7704
803-332-0191
Cans Unlimited, Inc.
P. O. Box 649
Taylor, SC 29687-0013
1-800-845-5301
803-879-3009
cuisales@aol.com
Hughes Supply
1311 S Fern Street
Arlington, VA 22202-2809
703-416-8555
Tuco Industrial Products
5223 180th St. SW, Suite 4A-1
Lynwood, WA 98037-4506
1-800-735-1268
425-743-9533
www.tucoheat.com
Auer Steel & Heating Supply
2935 W. Silver Spring Dr.
Milwaukee, WI 53209-4224
414-463-1234
www.auersteel.com
20
201839
OWNER’S MANUAL
ILLUSTRATED
PARTS LIST
CABINET ASSEMBLY
25,000 BTU/HR MODEL
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
8
5
SOLID STATE IGNITION
50 60 70 80 90
6
7
4
50 60 70 80 90
1
2
3
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 030643 Front Cover Assembly 1
2 121520 Screw, #8 x 3/8" ** 2
3 191240 Front Cover Trim* 1
4 160912 Thermostat 1
5 100892 Cabinet Assembly 1
6 070509 Cabinet Insulation (right and left sides) 1
7 121224 Screw, #10 x 3/4" ** 4
8 062242 Thermostat Mounting Plate 1
∆ 070542 Cabinet Insulation (back) 1
∆ 070508 Cabinet Insulation (top) 1
∆ 191244 Operating Instructions Decal (English) 1
∆ 191246 Operating Instructions Decal (French) 1
∆ 531010 Warning Decal 1
∆ 191262 Nameplate 1
∆ Parts available, not shown.
* You must order nameplate and operating instructions decal separately.
** Standard hardware, can be picked up at local hardware store.
201839
21
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
ILLUSTRATED
PARTS LIST
CABINET ASSEMBLY
40,000 BTU/HR MODEL
10
8
50 60 70 80 90
SOLID STATE IGNITION
50 60 70 80 90
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
5
9
6
4
1
7
2
3
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 280498 Bottom Shield 1
2 121520 Screw, #8 x 3/8" ** 2
3 191241 Front Cover Trim* 1
4 030642 Front Cover Assembly 1
5 100896 Cabinet Assembly 1
6 070511 Cabinet Insulation (right and left sides) 1
7 120158 Screw, #8 x 3/8" ** 2
8 160912 Thermostat (includes 2 screws) 1
9 121224 Screw, #10 x 3/4" ** 4
10 062242 Thermostat Mounting Plate 1
∆ 070541 Cabinet Insulation (back) 1
∆ 070510 Cabinet Insulation (top) 1
∆ 191245 Operating Instructions Decal (English) 1
∆ 191247 Operating Instructions Decal (French) 1
∆ 531010 Warning Decal 1
∆ 191262 Nameplate 1
∆ Parts available, not shown.
* You must order nameplate and operating instructions decal separately.
** Standard hardware, available at local hardware store.
22
201839
OWNER’S MANUAL
ILLUSTRATED
PARTS LIST
COMBUSTION CHAMBER
ASSEMBLY
25,000 BTU/HR MODEL
24
21
22
26
19
7
27
25
22
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
11
15
16
18
17
14
7
3
1
2
4
12
13
23
6
5
13
8
20
13
10
9
1
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 121357 Screw, #6 x 5/8" ** 4
2 231955 Wire Harness and
Ignition Control 1
3 062461 Ignition Control Mounting
Bracket 1
4 121372 Screw, #6 x 1/2" ** 2
5 230625 Time Delay Relay 1
6 230218 Bushing 1
7 120158 Screw, #8 x 3/8" ** 4
8 230825 Limit Switch 1
9 231144 Terminal Block 1
10 121224 Screw, #10 x 3/4" ** 2
11 070487 Gasket 1
12 231143 Transformer Assembly 1
13 121252 Screw, #10 x 3/8" ** 6
** Standard hardware, available at your local hardware store.
KEY PART
NO. NUMBER DESCRIPTION QTY.
14 020983 Combustion Chamber/
Heat Shield Assembly 1
15 070606 Heat Shield Gasket 1
16 070398 Burner Access Door Gasket 1
17 290141 Cover Plate 1
18 310026 Glass Disc 1
19 030893 Burner Access Door 1
20 230844 Bushing with Terminals 1
21 231950 Flame Sensing Probe 1
22 121502 Screw, #6 x 3/8" ** 2
23 090211 Junction Box Cover 1
24 121388 Screw, #10 x 1/2" ** 4
25 063018 Glo-Bar Retainer 1
26 100980-01 Glo-Bar 1
27 070909 Glo-Bar Gasket 1
201839
23
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
ILLUSTRATED
PARTS LIST
COMBUSTION CHAMBER
ASSEMBLY
40,000 BTU/HR MODEL
22
21
20
23
16
26
25
4
27
20
16
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
21
22
19
4
31
14
13
12
6
4
8
9
7
5
11
3
1
2
1
24
28
16
16
30
29
18
17
16
29
15
16
10
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 121502 Screw, #6 x 3/8" ** 2
2 231950 Flame Sensing Probe 1
3 063018 Glo-Bar Retainer 1
4 120158 Screw, #8 x 3/8" ** 6
5 030891 Burner Access Door 1
6 121388 Screw, #10 x 1/2" 4
7 310026 Glass Disc 1
8 290141 Cover Plate 1
9 070398 Burner Access Door Gasket 1
10 100980-01 Glo-Bar 1
11 070909 Glo-Bar Gasket 1
12 230844 Bushing with Terminals 1
13 070607 Heat Shield Gasket 1
14 020982 Combustion Chamber/Heat
Shield Assembly 1
15 061663 Wire Clamp 2
16 121252 Screw, #10 x 3/8" ** 12
17 230560 Limit Switch 1
** Standard hardware, available at your local hardware store.
24
KEY PART
NO. NUMBER DESCRIPTION QTY.
18 062563 Ignition Control Mounting
Bracket 1
19 231954 Wire Harness and
Ignition Control 1
20 121357 Screw, #6 x 5/8" ** 4
21 121224 Screw, #10 x 3/4" ** 4
22 070487 Gasket 2
23 121372 Screw, #6 x 1/2" ** 2
24 231144 Terminal Block 1
25 230625 Time Delay Relay 1
26 231164 Transformer Assembly 1
27 062837 Transformer and Relay
Mounting Bracket 1
28 062694 Wire Clamp, 5/8" Diameter 5
29 230555 Strain Relief Bushing 2
30 090211 Junction Box Cover 1
31 121577 Screw, #10 x 1/4" ** 2
201839
OWNER’S MANUAL
ILLUSTRATED
PARTS LIST
BURNER ASSEMBLY
25,000 BTU/HR MODEL
2
1
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
4
5
3
6
12
7
9
8
10
11
201839
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 120717 Hex Nut, #10-24 ** 2
2 121459 Screw, #10-24 x 1/2" ** 2
3 010701 Burner Assembly 1
4 180215 Main Burner Orifice 1
5 121388 Screw, #10 x 1/2" ** 4
6 070408 Manifold Gasket 1
7 171174 Manifold Assembly 1
8 170545 Reducer Fitting, 3/8" NPT to 1/8" NPT ** 1
9 160969 Valve 1
10 170012 90° Street Elbow ** 1
11 171170 Gas Inlet Pipe 1
12 170082 90° Elbow ** 1
** Standard hardware, available at your local hardware store.
25
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
ILLUSTRATED
PARTS LIST
BURNER ASSEMBLY
40,000 BTU/HR MODEL
2
1
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
5
4
6
6
3
12
13
7
8
9
10
11
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 120717 Hex Nut, #10-24 ** 4
2 010621 Left Burner Assembly 1
3 010623 Right Burner Assembly 1
4 070591 Manifold Gasket 1
5 171167 Manifold Assembly 1
6 180188 Main Burner Orifice 2
7 121388 Screw, #10 x 1/2" ** 6
8 160969 Valve 1
9 170012 90° Street Elbow ** 1
10 171170 Gas Inlet Pipe 1
11 121388 Screw, #10 x 1/2" ** 1
12 062180 Gas Inlet Pipe Clamp 1
13 170082 90° Elbow ** 1
** Standard hardware, available at your local hardware store.
26
201839
OWNER’S MANUAL
ILLUSTRATED
PARTS LIST
BLOWER ASSEMBLY
25,000 BTU/HR MODEL
3
2
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
23
21
25
24
14
17
16
4
6
8
15
5
7
23
17
17
12
13
11
19
18
22
20
1
9
10
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 350086 Room Air Wheel 1
2 121252 Screw, #10 x 3/8"** 5
3 121247 Screw, #2-56 x 5/8"** 2
4 230510 Microswitch Assembly 1
5 070537 Gasket 1
6 121661 Tinnerman Nut 2
7 390260 Blower Housing (room air) 1
8 121421 Hex Lock Nut, #10-24** 3
9 050751 Crossover Tube 1
10 121388 Screw, #10 x 1/2"** 4
11 070385 Crossover Tube Gasket 2
12 121227 Screw, #10-24 x 1/2"** 2
13 070362 Universal Bushing 1
14 231231 Capacitor Boot 1
15 390296 Combustion Air and Motor
Cover Assy. Housing 1
∆ Part available, not shown.
** Standard hardware, available at your local hardware store.
KEY PART
NO. NUMBER DESCRIPTION QTY.
16 070386 Combustion Air Housing
Gasket 1
17 231389 Motor with Bushings 1
18 062307 Motor Support Bracket 1
19 120717 Hex Nut, #10-24 (keps) 2
20 121712 Tinnerman 1
21 350117 Combustion Air Wheel 1
22 390240 Combustion Air Housing
(outside) 1
23 120615 Screw, #8 x 1/2" 10
24 231036 Capacitor 1
25 062633 Capacitor Clamp 1
∆ 161093 Equipment Shutoff Valve 1
201839
27
®
DYNAVENT
DIRECT-VENT PROPANE/LP GAS HEATER
ILLUSTRATED
PARTS LIST
BLOWER ASSEMBLY
40,000 BTU/HR MODEL
2
5
3
This list contains replaceable parts used in your furnace. When ordering parts, follow the
instructions listed under Replacement Parts on page 19 of this manual.
2
20
10
21
6
2
11
22
7
8
4
1
14
9
13
15
19
18
12
25
24
17
16
27
24
26
5
23
28
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 070570 Combustion Air Cover
Gasket 1
2 121252 Screw, #10 x 3/8" ** 8
3 350088 Room Air Wheel
(CW Rotation) 1
4 390328 Room Air Blower Housing
(left side) 1
5 120717 Hex Nut, #10-24 (keps) ** 5
6 121661 Tinnerman Nut 2
7 230681 Microswitch Assembly 1
8 121247 Screw, #2-56 x 5/8" ** 2
9 070537 Gasket 1
10 120615 Screw, #8 x 1/2" ** 1
11 390205 Combustion Air Cover Assy. 1
12 121388 Screw, #10 x 1/2" ** 3
13 070420 Combustion Air Crossover
Gasket 1
14 390318 Combustion Air and Motor
Cover Assembly 1
KEY PART
NO. NUMBER DESCRIPTION QTY.
15 121227 Screw, #10-24 x 1/2" ** 2
16 070362 Universal Bushing 1
17 070406 Combustion Air Housing
Gasket 1
18 120158 Screw, #8 x 3/8" ** 10
19 061663 Wire Clamp 1
20 231036 Capacitor 1
21 062691 Capacitor Clamp 1
22 231231 Capacitor Boot 1
23 350087 Room Air Wheel
(CCW Rotation) 1
24 231136 Motor with Bushings 1
25 062307 Motor Support Bracket 1
26 070165 Motor Gasket 1
27 350085 Combustion Air Wheel 1
28 390201 Room Air Blower Housing
(right side) 1
∆ 161093 Equipment Shutoff Valve 1
∆ Part available, not shown.
** Standard hardware, available at your local hardware store.
28
201839
OWNER’S MANUAL
NOTES
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_______________________________________________________________________________________________
201839
29
WARRANTY INFORMATION
KEEP THIS WARRANTY
Model ____________________________________
Serial No. _________________________________
Date Purchased ____________________________
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written warranty.
We make no other warranty, expressed or implied.
LIMITED WARRANTY
DYNAVENT GAS WALL FURNACE
DESA International warrants this product to be free from defects in materials and components for one (1) year and five (5) years on the
combustion chamber/heat exchanger assembly from the date of first purchase, provided that the product has been properly installed,
operated and maintained in accordance with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled
check must be presented.
This warranty is extended only to the original retail purchaser. This warranty covers only the cost of part(s) required to restore this furnace
to proper operating condition. Warranty part(s) MUST be obtained through authorized dealers of this product and/or DESA International
who will provide original factory replacement parts. Failure to use original factory replacement parts voids this warranty. The furnace
MUST be installed by a qualified installer in accordance with all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or parts that fail or become
damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by improper installation. Travel, diagnostic cost,
labor, transportation and any and all such other costs related to repairing a defective furnace will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE OF THE PRODUCT;
THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE TO ONE (1) YEAR FROM THE DATE OF FIRST PURCHASE; AND DESA INTERNATIONAL’S
LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA INTERNATIONAL SHALL
NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental or consequential
damages, so the above limitation on implied warranties, or exclusion or limitation on damages may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:
INTERNATIONAL
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com
201839
NOT A UPC
201839
Rev. F
03/00
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