Desa CGB35N, CGB50N User Manual
VENTED NATURAL
®
GAS HEATERS
OWNER’S OPERATION AND INSTALLATION MANUAL
Models: CGB35N and CGB50N
WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage, personal injury, or loss of life.
FOR YOUR SAFETY
— Do not store or use gasoline or other
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 per-
formed by a qualified installer, service
agency, or the gas supplier.
WARNING: Improper installation,
adjustment, alteration, service, or
maintenance can cause property
damage, personal injury or loss of
life. 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.
Save this manual for future reference.
CONTENTS
SECTION PAGE
Safety Information.........................................................................3
Product Identification .................................................................... 5
Local Codes ................................................................................... 6
Unpacking .................................................................................... 6
Product Features ............................................................................ 6
Installing Heater ............................................................................6
Check Gas Type...................................................................... 6
Installation Items.....................................................................6
Locating Heater.......................................................................7
Venting Heater ........................................................................ 8
Connecting to Gas Supply ...................................................... 11
Checking Gas Connections..................................................... 13
Installing Glass Panels ............................................................14
Fresh Air For Combustion and Ventilation...................................16
Determining Fresh-Air Flow for Heater Location
Example 1: Locating Heater in Unconfined (Open) Area 17
Draft Hood Spillage Test............................................ 17
Providing Permanent Fresh-Air Ventilation .............. 18
Example 2: Locating Heater in Confined (Closed) Area..19
Ventilating Confined Area ......................................... 19
Operating Heater ........................................................................... 20
For Your Safety Read Before Lighting .................................. 20
Lighting Instructions............................................................... 20
Manual Lighting Procedure .................................................... 22
To Turn Off Gas To Appliance .............................................. 22
Inspecting Pilot and Burner Flame................................................ 23
Pilot Flame Pattern .................................................................23
Burner Flame Pattern .............................................................. 23
Cleaning and Maintenance ............................................................ 25
Troubleshooting.............................................................................26
Service Procedures ........................................................................30
Removing Control Valve and Burner Tube............................30
Removing Burner.................................................................... 31
Changing Burner Orifice ........................................................ 32
Technical Service .......................................................................... 33
Specifications ................................................................................ 33
Service Hints ................................................................................. 33
Ordering Replacement Parts..........................................................34
Parts Centrals................................................................................. 34
Accessories .................................................................................... 35
Illustrated Parts List ......................................................................36-38
Warranty Information.................................................................... Back Cover
2
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SAFETY
INFORMATION
WARNINGS
WARNING ICON G 001
IMPORTANT: Read this owner’s manual carefully and completely be-
fore trying to assemble, operate, or service this heater. Improper use of
this heater can cause serious injury or death from burns, fire, explosion,
electrical shock, and carbon monoxide poisoning.
DANGER
WARNING ICON G 001
Carbon monoxide poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning
resemble the flu, with headaches, dizziness, or nausea. If you have these signs, the
heater may not be operating or venting properly. Get fresh air at once! Have heater
or heater venting system 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.
Natural Gas: Natural gas is odorless. An odor-making agent is added to natural gas.
The odor helps you detect a natural gas leak. However, the odor added to natural gas
can fade. Natural 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 heater.
1. A qualified service person must install heater and venting system.
2. Use only natural gas. Do not convert heater to use different fuel type.
3. 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.
4. This heater must have fresh air for proper operation. If not, poor fuel combustion
and improper venting of flue gases will result. Carbon monoxide poisoning from
backed-up flue gases could occur. The State of California lists carbon monoxide
as a reproductive toxin under Proposition 65. Read the instructions under
for Combustion and Ventilation, pages 16 through 19 for complete information.
Fresh Air
5. Never install the heater
• in a mobile home or a recreational vehicle.
• where curtains, furniture, clothing, or other flammable objects are less than 48
inches from the front, 53 inches from top, or 12 inches from right side and 6
inches from left side and back of heater.
• directly on carpeting, tile, or other combustible materials other than wood
flooring. Place heater on metal or wood panel extending the full width and
depth of heater.
• as a fireplace insert.
• in high traffic areas.
• in windy or drafty areas.
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Continued
3
SAFETY
INFORMATION
Continued
WARNINGS Continued
WARNING ICON G 001
6. Provide the following minimum heater clearances from combustibles (as viewed
from the front of heater):
Front: 48 inches
Back: 6 inches
Top: 53 inches
Right Side: 12 inches
Left Side: 6 inches
7. Do not run heater
• where flammable liquids or vapors are used or stored
• under dusty conditions
8. Never place clothing or any flammable objects on the heater or venting system.
9. Heater and venting system surfaces are very hot during operation. Keep children
and adults away from hot surfaces to avoid burns or clothing ignition. Carefully
supervise young children when they are in the same room as heater. Heater will
remain hot for a time after shutdown. Let surface cool before touching.
10. Do not use heater as a cooking device.
11. Do not alter heater or its controls. Any change may create a safety hazard.
12. Turn off heater and unplug (if equipped with blower) and let cool before
servicing. Unless you need gas supply for testing, shut off manual shutoff valve
before servicing. Only a qualified service person should service and repair heater
and venting system.
13. Replace any safety screen or guard removed for servicing before running heater.
14. Do not use heater if any part has been under water. Immediately call a qualified
service person to inspect the heater and to replace any part of the control system and
any gas control which has been under water.
4
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PRODUCT
IDENTIFICATION
Control
Knob
Ignitor
Button
Lower Front
Access Panel
Draft Hood
Outlet for
Venting
System
Control
Valve
Figure 1 - Vented Natural Gas Heater
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Figure 2 - Vented Natural Gas Heater, Rear View
5
LOCAL CODES
Install and use heater with care. Follow all local codes. In the absence of local
codes, use the latest edition of the following:
• National Fuel Gas Code ANSI Z223.1, also known as NFPA 54 *
• National Electrical Code ANSI/NFPA 70 *
*Available from: American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
UNPACKING
PRODUCT
FEATURES
INSTALLING
HEATER
1. Remove heater from carton.
2. Remove all protective packaging applied to heater for shipment.
3. Check heater for any shipping damage. If heater is damaged, promptly inform
dealer where you bought heater.
Piezo Ignition System
This heater has a piezo ignitor. This system requires no matches, batteries, or other
sources to light heater.
Thermostatic Heat Control
This heater has a thermostat sensing bulb and a control valve. This results in the
greatest heating comfort. This can also result in lower gas bills.
WARNING
WARNING ICON G 001
A qualified service person must install heater and venting
system. Have them inspect heater before use and at least
annually. Follow all local codes.
NOTICE
This heater must be electrically grounded if equipped with
blower. Follow all local codes. In the absence of local
codes, follow the National Electric Code, ANSI/NFPA 70.
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural gas, do not install heater.
Call dealer where you bought heater for proper type heater.
INSTALLATION ITEMS
Before installing heater, make sure you have all items below.
• piping (check local codes)
• sealant (resistant to propane gas)
• manual shutoff valve *
• ground joint union
• test gauge connection * (see
Figure 7, page 12)
* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an
acceptable alternative to test gauge connection. Purchase the optional A.G.A.
design-certified manual shutoff valve from your dealer. See Accessories, page 32.
• sediment trap
• tee joint
• pipe wrench
• venting materials
6
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INSTALLING
LOCATING HEATER
HEATER
Continued
WARNING
WARNING ICON G 001
Maintain the minimum clearances shown in Figure 3,
below. If you can, provide greater clearances.
WARNING
WARNING ICON G 001
Never install the heater
• in a mobile home or a recreational vehicle.
• where curtains, furniture, clothing, or other flam-
mable objects are less than 48 inches from the front,
53 inches from the top, 12 inches from the right side
and 6 inches from the left side and back of heater.
• directly on carpeting, tile, or other combustible
materials other than wood flooring. Place heater on
metal or wood panel extending the full width and
depth of heater.
• as a fireplace insert.
• in high traffic areas.
• in windy or drafty areas.
CAUTION
WARNING ICON G 001
If you install the heater in a home garage
• heater pilot and burner must be at least 18 inches
above floor
• locate heater where moving vehicle will not hit it.
For convenience and efficiency, install heater
• where there is easy access for operation, inspection, and service.
• in coldest part of room.
• near an electrical outlet if you are planning to add blower to heater. See
Accessories, page 35 for blower.
CEILING
6"
Minimum
Left
Side
48" Minimum from
Front of Heater
53"
Minimum
Right
Side
6" Minimum
from Back
12"
Minimum
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Figure 3 - Heater Clearances
Continued
7
INSTALLING
HEATER
VENTING HEATER
Note:
Venting/chimney materials are not supplied with heater.
Continued
WARNING
WARNING ICON G 001
A qualified service person must install the venting system
for this heater. If venting system is not properly installed
and maintained, the vent safety shut-off system will prevent the heater from running. Follow all local codes.
WARNING
WARNING ICON G 001
This heater has a vent safety shut-off system. This
system shuts off the heater gas supply if you do not
vent heater properly or the venting system is blocked.
Do not operate heater if not properly vented. Do not
tamper with the vent safety shut-off system. Carbon
monoxide poisoning and death may result.
WARNING
WARNING ICON G 001
When venting this heater, follow the safety information
listed below.
• Never vent heater to another room or inside a building. Only vent heater to the outdoors.
• Do not vent heater exhaust to a chimney or flue
serving another solid-fuel-burning or gas appliance.
• We recommend you use flues classified as prefabricated or masonry all-fuel chimney or type-B vent. See
Vent Types,
page 10.
• If using old vent, check vent for soot, creosote, and
loose particles. If vent is damaged, repair or replace
it before using heater.
• Extend the vertical section of vent pipe at least three
feet above roof penetration.
• Extend the vertical section of vent pipe at least two
feet above the highest point of any roof within ten
feet.
• The horizontal run of vent pipe should rise at least
1/4 inch for each foot of run.
• Support the vent pipe at least every five feet along its
length. Do not use combustible materials to support
vent pipe.
• Never extend vent pipe horizontally through outside
wall and terminate. You must connect a vertical run
of vent pipe to the horizontal run. The vertical run
must be at least 25% longer than the horizontal run.
• Install vent or chimney cap that is approved for use
with vented gas room heaters.
• Do not use vent pipe smaller in diameter than that of
the heater draft hood outlet.
• Do not use dampers in the vent pipes.
• Vertical height of vent must be greater than five feet
above vent connection at draft hood.
8
100351
INSTALLING
VENTING HEATER
(continued)
HEATER
Continued
WARNING
Do not vent heater in any of the following ways (see Figure 4).
Heater must be vented to the outdoors. Never vent heater to another
room or inside a building.
The vertical section of vent pipe must
extend at least two feet above the
highest point of any roof within ten
feet.
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Never extend vent pipe horizontally
through outside wall and terminate.
You must connect a vertical run of
vent pipe to the horizontal run. The
vertical run must be at least 25%
longer than the horizontal run.
Less than 5' between elbows
Vertical run of pipe must be at least
five feet from elbow to elbow.
Figure 4 - Improper Venting Systems
Never extend vent pipe horizontally
through a chimney or flue. You must
connect a vertical run of vent pipe to
the horizontal run. The vertical run
must be at least 25% longer or five
feet minimum than the horizontal run.
Continued
9
INSTALLING
HEATER
Continued
VENTING HEATER
(continued)
Proper Size Vent
To safely vent heater, the vent connector pipe must be the same diameter as the draft
hood outlet on the rear of the heater. Pipe that is too small can cause flue gas to spill
from the heater. Fasten vent connector to the draft hood outlet with a sheet metal screw.
Vent Types
Prefabricated or Masonry All-Fuel Chimney - This is a masonry chimney or a
residential-type prefabricated chimney. Only use prefabricated chimneys listed by
Underwriters Laboratories (UL), Inc.
Type-B Vent - These vents are made of noncombustible, corrosion resistant
material. They are certified by a nationally recognized testing agency. Type-B
vents are doubleaccordance with the listing of the particular type-B vent. Type-B vents are currently
listed as B-1, B-1 1/2, and B-2.
The illustrations below show both vent types. The illustration shows typical
construction of each type of venting system. Minimum clearances and lengths are
added to the illustrations.
walled pipe. Clearances to combustible construction must be in
Terminate at least 5' above draft hood.
If vent extends over 5' above roof,
support with guy wires or braces.
Vent Cap
Must Be At
Least 2 Feet
Above
Highest Point
Within 10
Feet.
Seal Around
Collar and
Flashing
10
5'
Min.
6"
Min.
Heater
Prefabricated or Masonry
All-Fuel Chimney
Figure 5 - Typical Construction of Venting Systems
Maintain Listed
Clearance of Vent
Support If
Necessary
Lock Joints
Lock Joints
Vent
Connector
Position
Firestop
Maintain Listed
Clearance of
Vent
Vertical Vent
Heater
Type-B Vent
Lock
Joints
Support
Laterals
53"
Min.
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INSTALLING
CONNECTING TO GAS SUPPLY
HEATER
Continued
WARNING
WARNING ICON G 001
A qualified service person must connect heater to gas
supply. Follow all local codes.
WARNING
WARNING ICON G 001
Never connect heater to private (non-utility) gas wells.
This gas is commonly known as well-head gas.
IMPORTANT:
Check gas line pressure at gas meter before connecting heater to gas
line. Gas line pressure must be no greater than 14 inches of water. If gas line
pressure is higher, heater regulator damage could occur.
Gas Meter
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Figure 6 - Connecting Heater to Utility Gas Line
CAUTION
WARNING ICON G 001
Use only new, black iron or steel pipe. Copper tubing
may be used in certain areas. Check your local codes.
Use pipe that is 1/2" in diameter or greater to allow
proper gas volume to heater. If pipe is too small, undue
loss of pressure will occur.
The gas supply line to your heater must be 1/2 inch in diameter or larger. If the
supply line branches to serve two or more heaters, the line from the branch back to
the gas meter must be doubled or tripled, etc., in size (depending upon the number
of heaters).
Example for 1/2 inch diameter supply line:
If the supply line branches
to serve two heaters, the line diameter from the branch back to the gas meter must
be at least 1 inch. If three heaters are served, the line diameter from the branch
back to the gas meter must be at least 1 1/2 inches.
Note:
If gas supply line total length exceeds forty feet, use a larger diameter pipe.
Use pipe that is the next size larger than the heater control valve fitting.
Continued
11
INSTALLING
HEATER
Installation must include a manual shutoff valve, 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 heater (see Figure 7).
Continued
Apply pipe joint sealant lightly to male threads. This will prevent excess sealant
from going into pipe. Excess sealant in pipe could result in clogged heater valves.
CAUTION
WARNING ICON G 001
Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.
Install sediment trap in supply line as shown in Figure 7. Locate sediment trap
where it is within reach for cleaning. Locate sediment trap where trapped matter is
not likely to freeze. A sediment trap traps moisture and contaminants. This keeps
them from going into heater controls. If sediment trap is not installed or is installed
wrong, heater may not run properly.
IMPORTANT:
Use two pipe wrenches when connecting gas piping to gas control
valve of heater. This will prevent turning or damaging control valve.
Acceptable
construction
Control
Valve
of inlet gas
line
Ground
Joint
Union
Test
Gauge
Connection*
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Tee Joint
Tee Joint
Sediment
Trap
Figure 7 - Gas Connection
Pipe
Nipple
Cap
Manual
Shutoff
Valve *
From Gas
Meter (5" W.C.
Min** to 7"
W.C. Max)
Preferred
construction
of inlet gas
line
From
Gas
Meter (5"
W.C.
Min** to
7" W.C.
Max)
12
* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an
acceptable alternative to test gauge connection. Purchase the optional A.G.A.
design-certified manual shutoff valve from your dealer. See Accessories, page 35.
** For purposes of input adjustment.
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