Desa Vanguard GVC50NA Quick start guide

Save this manual for future reference.
WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage, per-
sonal 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.
• Immediatelycallyourgassupplierfrom
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 cor-
rect installation and operational
procedures. For assistance or
additional information consult a
qualified installer, service agency,
or the gas supplier.
OWNER’S OPERATION AND INSTALLATION MANUAL
®
VENTED NATURAL
GAS HEATERS
®
Models: GVC65NA, GVC50NA, GVC35NA

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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
Fresh Air For Combustion and Ventilation...................................14
Determining Fresh-Air Flow for Heater Location
Example 1: Locating Heater in Unconfined (Open) Area 15
Draft Hood Spillage Test............................................ 15
Providing Permanent Fresh-Air Ventilation ..............16
Example 2: Locating Heater in Confined (Closed) Area..17
Ventilating Confined Area .........................................17
Operating Heater ...........................................................................18
For Your Safety Read Before Lighting ..................................18
Lighting Instructions............................................................... 18
Manual Lighting Procedure ....................................................20
Blower Operation (For Models with Blower) ........................20
To Turn Off Gas To Appliance .............................................. 20
Inspecting Pilot and Burner Flame................................................ 21
Pilot Flame Pattern..................................................................21
Burner Flame Pattern ..............................................................21
Cleaning and Maintenance ............................................................ 23
Troubleshooting............................................................................. 24
Service Procedures ........................................................................ 28
Removing Control Valve and Burner Tube............................28
Removing Burner.................................................................... 29
Changing Burner Orifice ........................................................ 30
Blower Wiring Diagram................................................................ 30
Technical Service .......................................................................... 31
Specifications ................................................................................ 31
Service Hints ................................................................................. 31
Accessories ....................................................................................31
Ordering Replacement Parts.......................................................... 32
Parts Centrals................................................................................. 32
Illustrated Parts List ...................................................................... 33-35
Warranty Information.................................................................... Back Cover

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SAFETY
INFORMATION WARNINGS
IMPORTANT: Read this owner’s manual carefully and completely be-
foretrying toassemble,operate, orservice thisheater. Improperuse of
thisheatercancauseseriousinjuryordeathfromburns,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, or nausea. If you have these signs, the
heater may not be operating or venting properly. Getfresh airat 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.
NaturalGas: Naturalgasisodorless.Anodor-makingagentisaddedtonaturalgas.
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.
Makecertain you read and understandallWarnings.Keepthis 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. Thisheatermusthave fresh air for proper operation. If not, poor fuel combustion
andimproperventingoffluegases will result. Carbon monoxide poisoning from
backed-up flue gases could occur. The State of California lists carbon monoxide
asareproductivetoxinunderProposition65.ReadtheinstructionsunderFreshAir
for Combustion and Ventilation, pages 14 through 17 for complete information.
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.
Continued

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SAFETY
INFORMATION
Continued
WARNINGS Continued
6. Providethe 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
beforeservicing. Onlyaqualified service personshouldservice and repairheater
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
servicepersontoinspecttheheaterandtoreplaceanypartofthecontrolsystemand
any gas control which has been under water.

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PRODUCT
IDENTIFICATION
Figure 1 - Vented Natural Gas Heater
Lower Front
Access Panel
Ignitor
Button
Control
Knob
Figure 2 - Vented Natural Gas Heater, Rear View
Draft Hood
Outlet for
Venting
System
Blower
(on models
equipped with
blower)
Control
Valve

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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 *
• National Standard of Canada CAN1-B149 **
*Available from: American National Standards Institute, Inc., 1430 Broadway,
New York, NY 10018; or National Fire Protection Association, Inc., Batterymarch
Park, Quincy, MA 02269
**Available from: Standards Council of Canada, 350 Sparks Street, Ottawa,
Ontario, K1R 7S8
LOCAL CODES
UNPACKING 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.
NOTICE
Thisheatermustbeelectricallygroundedifequippedwith
blower. Follow all local codes. In the absence of local
codes, follow the National Electric Code, ANSI/NFPA 70
(U.S.) or Canadian Electrical Code CSA C22.1 (Canada).
INSTALLING
HEATER WARNING
A qualified service person must install heater and
venting system. Have them inspect heater before use
and at least annually. Follow all local codes.
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.
* 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 31.
• piping (check local codes)
• sealant (resistant to propane gas)
• manual shutoff valve *
• ground joint union
• test gauge connection * (see
Figure 7, page 12)
• sediment trap
• tee joint
• pipe wrench
• venting materials
PRODUCT
FEATURES
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.

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INSTALLING
HEATER
Continued
LOCATING HEATER
WARNING
Maintain the minimum clearances shown in Figure 3,
below. If you can, provide greater clearances.
WARNING
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
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 heater has blower or if you are planning to add
blower to heater. See Accessories, page 31 for blower.
Figure 3 - Heater Clearances
53"
Minimum
CEILING
Left
Side
6"
Minimum
Right
Side
48" Minimum from
Front of Heater
6" Minimum
from Back
12"
Minimum
Continued

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Note: Venting/chimney materials are not supplied with heater.
VENTING HEATER
INSTALLING
HEATER
Continued
WARNING
When venting this heater, follow the safety information
listed below.
•Never vent heater to another room or inside a build-
ing. 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 prefabri-
cated 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.
WARNING
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 pre-
vent the heater from running. Follow all local codes.
WARNING
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.

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INSTALLING
HEATER
Continued
VENTING HEATER (continued)
WARNING
Do not vent heater in any of the following ways (see Figure 4).
Heater must be vented to the out-
doors. 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.
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.
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.
Vertical run of pipe must be at least
five feet from elbow to elbow.
Figure 4 - Improper Venting Systems
Continued
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Less than 5' between elbows

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VENTING HEATER (continued)
INSTALLING
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
fromtheheater.Fastenventconnectortothedrafthoodoutletwithasheetmetalscrew.
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 double-walled pipe. Clearances to combustible construction must be in
accordance with the listing of the particular type-B vent. Type-B vents are cur-
rently 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.
Figure 5 - Typical Construction of Venting Systems
5'
Min. 6"
Min.
Heater
Vent
Connector
Lock Joints
Vertical Vent
53"
Min.
Maintain Listed
Clearance of
Vent
Lock Joints
Position
Firestop Support
Laterals
Lock
Joints
Support If
Necessary
Maintain Listed
Clearance of Vent
Vent Cap
Must Be At
Least 2 Feet
Above
Highest Point
Within 10
Feet.
Seal Around
Collar and
Flashing
Type-B Vent
Prefabricated or Masonry
All-Fuel Chimney
Heater
Terminate at least 5' above draft hood. If vent extends over
5' above roof, support with guy wires or braces.