Procom WZN18HLA User manual

VENT-FREE YELLOW FLAME GAS LOG
HEATER
WARNING: If the information in this manual is not
followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable va-
pors 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 re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Questions, problems, missing parts? Before returning to your retailer, call
our customer service department at 1-866-573-0674, 7:30 am - 4:15 pm CST,
Monday through Friday or email [e-mail]
MODELS
WZ(N,L)18HLA
WZ(N,L)24HLA
WZ(N,L)18MVA
WZ(N,L)24MVA
WZ(N,L)30MVA

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TABLE OF CONTENTS
Specications ............................................ 3
Safety ........................................................ 3
Product Features....................................... 5
Local Codes............................................... 5
Unpacking.................................................. 5
Qualied Installing Agency ........................ 6
Water Vapor: A By-Product Of
Unvented Room Heaters..................... 6
Air For Combustion and Ventilation........... 6
Installation ................................................. 8
Operation................................................. 19
Inspecting Burners................................... 23
Care And Maintenance............................ 24
Troubleshooting....................................... 25
Replacement Parts.................................. 29
Technical Services................................... 29
Accessories ............................................. 29
Parts ........................................................ 30
Warranty .................................................. 36
This is an unvented gas-red heater. It uses air (oxygen)
from the room in which it is installed. Provisions for ad-
equate combustion and ventilation air must be provided.
Refer to Air for Combustion and Ventilation section on
page 6 of this manual.
WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause injury or
property damage. Refer to this manual for correct in-
stallation and operational procedures. For assistance
or additional information consult a qualied installer,
service agency or the gas supplier.
This appliance may be installed in an aftermarket,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with propane or natural
gas. Field conversion by any other means including the
use of a kit is not permitted.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer.
SAVE THIS BOOK
IMPORTANT: Read this owner’s manual carefully and
completely before trying to assemble, operate, or ser-
vice this heater. Improper use of this heater can cause
serious injury or death from burns, re, explosion, elec-
trical shock and carbon monoxide poisoning. Failure to
follow these instructions will void the warranty.

www.usaprocom.com 3200068-01A
Only a qualied installer, service
agent, or local gas supplier may
install and service this product.
WARNING: Keep the appli-
ance area clear and free from
combustible materials, gasoline,
and other ammable vapors and
liquids.
WARNING: This appliance
is equipped for use with natural
gas OR propane gas. Field con-
version is not permitted.
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.
DANGER: Carbon monoxide
poisoning may lead to death!
SPECIFICATIONS
SAFETY
Carbon Monoxide Poisoning: Early signs of
carbon monoxide poisoning resemble the u,
with headaches, dizziness or nausea. If you
have these signs, the heater may not be work-
ing properly. Get fresh air at once! Have heater
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 inuence
of alcohol and those at high altitudes.
Natural And Propane/LP Gas: Natural and
Propane/LP gas are odorless. An odor-making
agent is added to the gas. The odor helps you
detect a gas leak. However, the odor added to
the gas can fade. Gas may be present even
though no odor exists.
WARNING: Do not use a
blower insert, heat exchanger
insert or any accessory not ap-
proved for use with this log set.
WARNING: Do not allow fans
to blow directly into the heater.
Avoid any drafts that alter burner
ame pattern including ceiling
fans. Altered burner patterns
can cause sooting.
MODEL WZN18(HL,MV)A WZN24(HL,MV)A WZN30MVA
Ignition Piezo Ignitor Piezo Ignitor Piezo Ignitor
Gas Type Natural Natural Natural
Input Rating 32,000 BTU/Hr 34,000 BTU/Hr 40,000 BTU/Hr
Manifold Pressure 3" W.C. 3" W.C. 3" W.C.
Inlet Gas Pressure*
(inches of water)
Max. 10.5" W.C. Max. 10.5" W.C. Max. 10.5" W.C.
Min. 5" W.C. Min. 5" W.C. Min. 5" W.C.
MODEL WZL18(HL,MV)A WZL24(HL,MV)A WZL30MVA
Ignition Piezo Ignitor Piezo Ignitor Piezo Ignitor
Gas Type Propane/LP Propane/LP Propane/LP
Input Rating 32,000 BTU/Hr 34,000 BTU/Hr 40,000 BTU/Hr
Manifold Pressure 8" W.C. 8" W.C. 8" W.C.
Inlet Gas Pressure*
(inches of water)
Max. 14" W.C. Max. 14" W.C. Max. 14" W.C.
Min. 11" W.C. Min. 11" W.C. Min. 11" W.C.
* For purposes of input adjustment.

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WARNING: Any change to
this heater or its controls can
be dangerous.
WARNING: Do not place
clothing or other flammable
material on or near the appli-
ance. Never place any objects
in the heater.
WARNING: Due to high tem-
peratures, the appliance should
be located out of trafc and away
from furniture and draperies.
WARNING: Heater becomes
very hot when running. Keep
children and adults away from
hot surfaces to avoid burns or
clothing ignition. Heater will re-
main hot for a time after shutoff.
Allow surfaces to cool before
touching.
WARNING: Carefully super-
vise young children when they
are in the room with the heater.
WARNING: Make sure a re-
place screen is in place before
running heater.
1. Do not place Propane/LP supply tank(s)
inside any structure. Propane/LP supply
tank(s) must be placed outdoors.
2. This heater should not be installed in a
bedroom or bathroom unless installed as
a vented appliance.
3. This heater needs fresh air ventilation to
run properly. This heater has an Oxygen
Depletion Sensing (ODS) safety shutoff
system. The ODS shuts down the heater
if not enough fresh air is available. See Air
for Combustion and Ventilation, page 6.
If heater keeps shutting off, see Trouble-
shooting, page 25.
4. Do not add extra logs or ornaments such
as pine cones, vermiculite, or rock wool.
Using these added items can cause soot-
SAFETY
ing. Do not add lava rock around base.
Rock and debris could fall into the control
area of heater. After servicing, always
replace screen before operating heater.
5. If replace has glass doors, never operate
this heater with glass doors closed. If you
operate heater with doors closed, heat will
build-up inside replace and cause glass
to burst. If replace opening has vents
at the bottom, you must open the vents
before operating log set. Always operate
heater with glass doors fully open.
6. This log heater is designed to be smoke-
less. If logs ever appear to be smoking,
turn off heater and call a qualied service
technician. NOTE: During initial operating,
slight smoking could occur due to log cur-
ing and heater burning off manufacturing
residues.
7. To prevent the creation of soot, follow the
instructions under Care and Maintenance
page 24.
8. Do not run heater:
• Where ammable liquids or vapors are
used or stored.
• Under dusty conditions.
9. Before using furniture polish, wax, carpet
cleaner, or similar products, turn heater
off. If heated, the vapors from these prod-
ucts may create a white powder residue
within burner box or on adjacent walls or
furniture.
10. Do not use heater if any part has been
under water. Immediately call a qualied
service technician to inspect the room
heater and to replace any part of the
control system and any gas control which
has been under water.
11. Turn off and let cool before servicing. Only
a qualied service person should service
and repair heater.
12. Operating heater above elevations of
4,500 feet could cause pilot outage.
13. Do not use this heater if any log is broken.
Do not operate heater if a log is chipped
(dime-size or larger).
14. To prevent performance problems, do
not use propane/LP fuel tank of less than
100 lbs. capacity.
15. Solid fuels should not be burned in
replace in which a vent-free log set is
installed. Do not use this heater to cook
food or burn paper or other objects.

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PRODUCT FEATURES
This heater is clean burning. It requires no outside venting. There is no heat loss out of a
vent or up a chimney. Heat is generated by realistic, dancing yellow ames. This heater is
designed for vent-free operation with ue damper closed. It has been tested and approved to
ANSI Z21.11.2 standard for unvented heaters. State and local codes in some areas prohibit
the use of vent-free heaters.
Install and use heater with care. Follow all
local codes. In the absence of local codes,
use the latest edition of The National Fuel
Gas Code, ANSI Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
25 West 43rd Street
New York, NY 10036
National Fire Protection Association, Inc.
1 Batterymarch Park
Quincy, MA 02269-9101
LOCAL CODES
State of Massachusetts: The installation
must be made by a licensed plumber or
gas tter in the Commonwealth of Mas-
sachusetts.
Sellers of unvented propane or natural
gas-red supplemental room heaters shall
provide to each purchaser a copy of 527
CMR 30 upon sale of the unit.
In the State of Massachusetts the gas
cock must be a T-handle type. The State
of Massachusetts requires that a exible
appliance connector cannot exceed three
feet in length.
UNPACKING
CAUTION: Do not remove the
metal data plates from the burner
pan. The data plates contain
important product information.
1. Remove logs and burner base assembly
from carton. NOTE: Do not pick up burner
base assembly by burners as this could
damage heater. Always handle base as-
sembly by grate.
2. Remove all protective packaging applied
to logs and base for shipment.
3. Check all items for any shipping damage.
If damaged, promptly inform dealer where
you purchased the heater.
SAFETY PILOT
This heater has a pilot with an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS/pilot shuts off the heater if there is not
enough fresh air.
PIEZO IGNITION SYSTEM
This heater is equipped with a piezo ignitor.
This system requires no matches, batteries,
or other sources to light heater.
Figure 1 - Product Identication
(Logs May Vary by Model, HLA Base
Shown)
Ignitor Control Knob

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QUALIFIED INSTALLING AGENCY
Only a qualied agency should install and
replace gas piping, gas utilization equipment
or accessories, and repair and equipment ser-
vicing. The term “qualied agency” means any
individual, rm, corporation, or company that
either in person or through a representative
is engaged in and is responsible for:
a) Installing, testing, or replacing gas piping
or
b) Connecting, installing, testing, repairing,
or servicing equipment; that is experienced
in such work; that is familiar with all precau-
tions required; and that has complied with
all the requirement of the authority having
jurisdiction.
In areas that prohibit the use of vent-free
heaters, the log set has been tested and
approved to the ANSI Z21.60 standard for
Vented Decorative Logs. When used as a
vented log set refer to additional instructions
on page 11.
WATER VAPOR: A BY-PRODUCT OF
UNVENTED ROOM HEATERS
Water vapor is a by-product of gas combus-
tion. An unvented room heater produces ap-
proximately one (1) ounce (30 mL) of water
for every 1,000 BTUs (0.3 KWs) of gas input
per hour. Unvented room heaters are recom-
mended as supplemental heat (a room) rather
than a primary heat source (an entire house).
In most supplemental heat applications, the
water vapor does not create a problem. In
most applications, the water vapor enhances
the low humidity atmosphere experienced
during cold weather.
The following steps will help ensure that water
vapor does not become a problem.
1. Be sure the heater is sized properly for the
application, including ample combustion
air and circulation air.
2. If high humidity is experienced, a dehu-
midier may be used to help lower the
water vapor content of the air.
3. Do not use an unvented room heater as
the primary heat source.
AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall
not be installed in a conned
space or unusually tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read the
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.
Today’s homes are built more energy efcient
than ever. New materials, increased insulation
and new construction methods help reduce
heat loss in homes. Home owners weather
strip and caulk around windows and doors
to keep the cold air out and the warm air in.
During heating months, home owners want
their homes as airtight as possible.
While it is good to make your home energy
efcient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, replaces, clothes dryers and
fuel burning appliances draw air from the
house to operate. You must provide adequate
fresh air for these appliances. This will insure
proper venting of vented fuel-burning appli-
ances.
WARNING: This heater
shall not be installed in a room
or space unless the required
volume of indoor combustion
air is provided by the method
described in the National Fuel
Gas Code, ANSI Z223.1/NFPA
54, the International Fuel Gas
Code, or applicable local codes.

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AIR FOR COMBUSTION AND VENTILATION
WARNING: If the area in which
the heater may be operated does
not meet the required volume for
indoor combustion air, combus-
tion and ventilation air shall be
provided by one of the methods
described in the National Fuel
Gas Code, ANSI Z223.1/NFPA
54, the International Fuel Gas
Code, or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining
unconned space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
ceiling and one within 12" of the oor on the
wall connecting the two spaces (see options
1 and 2, Figure 2). You can also remove door
into adjoining room (see option 3, Figure 2).
Follow the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Air for Combustion and
Ventilation for required size of ventilation
grills or ducts.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
and one within 12" of the oor. Connect these
items directly to the outdoors or spaces open
to the outdoors. These spaces include attics
and crawl spaces. Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation for required size
of ventilation grills or ducts.
IMPORTANT: Do not provide openings
for inlet or outlet air into attic if attic has a
thermostat-controlled power vent. Heated air
entering the attic will activate the power vent. If
an attic opening is unacceptable. Recongure
the conned space, by adding ventilation to
adjoining unconned space or removing doors
as indicated in Figure 2, Option 1 and 2. The
combined spaces must have enough fresh air
to supply all appliances in both spaces. Oth-
erwise a lower input model must be installed
that meets the room size requirements.
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
Figure 2 - Ventilation Air from Inside
Building
Figure 3 - Ventilation Air from Outdoors
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills Into
Adjoining
Room,
Option 1
12"
12"

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INSTALLATION
NOTICE: This heater is intended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your pri-
mary heat source. If you have a
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: A qualied ser-
vice person must install heater.
Follow all local codes.
WARNING: Before installing
in a solid fuel burning replace,
the chimney ue and rebox
must be cleaned of soot, creo-
sote, ashes and loose paint by
a qualified chimney cleaner.
Creosote will ignite if highly
heated. A dirty chimney ue may
create and distribute soot within
the house. Inspect chimney ue
and rebox for damage. If dam-
aged, repair ue before operat-
ing heater.
WARNING: Seal any fresh
air vents or ash clean-out doors
located on oor or wall of re-
place. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney ue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, cloth-
ing, or other ammable objects
are less than 36" from the front,
42" from top, or 16" from sides
of the heater.
• in high trafc areas
• in windy or drafty areas
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as to-
bacco smoke, aromatic candles,
cleaning uids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls or cause odors.
NOTICE: State or local codes
may only allow operation of this
appliance in a vented congura-
tion. Check your state or local
codes.
WARNING: This appliance is
designed for installation in only
a solid-fuel burning masonry or
UL 127 factory-built replace or
in a listed ventless rebox enclo-
sure. Exception: DO NOT install
this appliance in a factory-built
replace that includes instruc-
tions stating it has not been
tested or should not be used
with unvented gas logs.

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Figure 4 - Minimum Clearance for
Combustible to Wall
INSTALLATION
IMPORTANT: Vent-free heaters add moisture
to the air. Although this is benecial, installing
heater in rooms without enough ventilation air
may cause mildew to form too much moisture.
See Air for Combustion and Ventilation, pages
6 and 7.
Before beginning assembly or operation of
the product, make sure all parts are pres-
ent. Compare parts with package contents
list. If any part is missing or damaged, do
not attempt to assemble, install or operate
the product. Contact customer service for
replacement parts.
Before installing heater, make sure you have
the items listed below:
• Hardware package (provided with heater)
• Electric drill with 3/16" drill bit
• Phillips screwdriver
CHECK GAS TYPE
Be sure your gas supply is right for your heat-
er. Otherwise, call dealer where you bought
the heater for proper type heater.
CLEARANCES TO
COMBUSTIBLES
WARNING: Maintain the mini-
mum clearances. If possible, pro-
vide greater clearances from oor,
ceiling, and adjoining wall. Measure
from outermost point of heater.
Minimum Fireplace Clearance To
Combustible Materials
Side Wall 16", Ceiling 42", Front 36"
LOG SIZING REQUIREMENTS
Minimum Firebox Size
18" Log Set: Height 20", Depth 14",
Front Width 29", Rear Width 23"
24" Log Set: Height 20.5", Depth 14",
Front Width 34", Rear Width 25.5"
30" Log Set: Height 20.5", Depth 14",
Front Width 39", Rear Width 31.5"
Minimum Clearances For Side
Combustible Material, Side Wall
and Ceiling
A. Clearance from the side of the replace
cabinet to any combustible material and
wall should follow diagram in Figure 4.
B. Clearance from the top of the replace
opening to the ceiling must not be less
than 42".
Minimum Noncombustible Material
Clearances
If Not Using Mantel
Note: If using a mantel, proceed to If Using
Mantel, page 10. If not using a mantel, follow
the information below.
You must have noncombustible material(s)
above the replace opening. Noncombustible
materials (such as slate, marble, tile, etc.)
must be at least 1/2" thick. With sheet metal,
you must have noncombustible material be-
hind it. Noncombustible material must extend
at least 12" up (for all models). See Figure 5
for minimum clearances.
*Minimum 16" from Side Wall
*
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
Noncombustible
Material Distance
Requirements for Safe Installation
(A) 12" or more: Noncombustible material okay.
(A) Between 8" and 12":
24" & 30" Models, install replace hood
accessory. 18" Models, noncombustible
material okay.
(A) Less than 8": Noncombustible
material must be extended to at least 8".
See Between 8" and 12", above. If you
cannot extend material, you must operate
heater with ue damper open.

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NOTICE: This heater may be
used as a vented product. If so,
you must always operate log set
with chimney ue damper open.
If running log set with damper
open, noncombustible material
above replace opening is not
needed. Go to Installing Damper
Clamp Accessory for Vented
Operation, page 11.
If Using Mantel
You must have noncombustible material(s)
above the replace opening. Noncombustible
materials (such as slate, marble, tile, etc.)
must be at least 1/2" thick. With sheet metal,
INSTALLATION
Figure 6 - Minimum Mantel Clearances
Without Using Hood
Figure 7 - Minimum Mantel Clearances
When Using Hood
Minimum
Noncombustible
Material
Minimum
Noncombustible
Material Height
Distances to
Underside of
Mantel
Top of
Fireplace
Opening
Underside of
Mantel Shelf
Mantel Shelf
8"
(A)
8" 14" 16" 20" 18" Log Set
12" 18" 20" 22" 24" 24" Log Set
All minimum
distances are
in inches
2 1/2"
6"
8"
10"
Minimum
Noncombustible
Material
8"
Min.
12" 15" 18" 20"
2½"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
Top of
Fireplace
Opening
Underside
of Mantel
Shelf
Mantel Shelf
you must have noncombustible material be-
hind it. Noncombustible material must extend
at least 8" up. If noncombustible material is
less than 12", you must install the replace
hood accessory. Even if noncombustible
material is more than 12", you may need the
hood accessory to deect heat away from
your mantel shelf. See Figures 5, 6 and 7, for
minimum clearances.
MANTEL CLEARANCES
In addition to meeting noncombustible mate-
rial clearances, you must also meet required
clearances between replace opening and
mantel shelf. If you do not meet the clearances
listed below, you will need a hood.
Determining Minimum Mantel
Clearance
If you meet minimum clearance between
mantel shelf and top of replace opening, a
hood is not required (see Figure 6).
Determining Minimum Mantel
Clearance When Using a Hood
If minimum clearances in Figure 6 are not met,
you must have a hood. When using a hood
there are still certain minimum mantel clear-
ances required. Follow minimum clearances
shown in Figure 7, when using hood.
NOTICE: Surface temperatures
of adjacent walls and mantels
become hot during operation.
Walls and mantels above the
firebox may become hot to
the touch. If installed properly,
these temperatures meet the
requirement of the national
product standard. Follow all
minimum clearances shown in
this manual.
NOTICE: If your installation does
not meet the minimum clear-
ances shown, you must do one
of the following:
• operate the logs only with the
ue damper open
• raise the mantel to an accept-
able height
• move the mantel
30" Log Set

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INSTALLATION
Figure 10 - Attaching Damper to Fireplace
Damper
Damper
Clamp
Hearth
5"
Min.
Combustible
Material
14"
Min.
Combustible
Material
Noncombustible Material
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
FLOOR CLEARANCES
INSTALLING DAMPER CLAMP ACCESSORY FOR VENTED
OPERATION
When used as a vented heater, appliance
must be installed only in a solid-fuel burning
replace with a working ue constructed of
noncombustible material. You may use this
heater as a vented product. There are three
reasons for operating your heater as a vented
model:
1. The replace does not meet the clearance
requirements for vent-free operation.
2. State or local codes do not permit vent-
free operation.
3. You prefer vented operation.
If reasons number 1 or 2 above apply, you
must permanently open chimney ue damper.
You must install the damper clamp accessory
(not provided). This will insure vented opera-
tion (see Figure 10). The damper clamp will
keep damper open. Installation instructions
are included with clamp accessory.
See chart below for the minimum permanent
ue opening you must provide. Attach damper
clamp so the minimum permanent opening will
be maintained at all times.
Chimney
Height
Minimum Permanent
Flue Opening
6' to 15' 39 sq inches
15' to 30' 29 sq inches
Area of Various Standard Round Flues
Diameter Area
5" 20 sq inches
6" 29 sq inches
7" 39 sq inches
8" 51 sq inches
A. If installing appliance on the oor level,
you must maintain the minimum distance
of 14" to combustibles (see Figure 8).
B. If combustible materials are less than 14"
to the replace, you must install appliance
at least 5" above the combustible ooring
(see Figure 9).

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INSTALLATION
Figure 11 - Attaching Heater Base to
Fireplace Floor
Masonry Screw
Mounting Bracket
2. Mark screw locations through holes in
mounting brackets (see Figure 11). If
installing in a brick-bottom replace, mark
screw locations in mortar joint of bricks.
3. Remove heater base from replace.
4. Drill holes at marked locations using 3/16"
drill bit.
5. Apply pipe joint sealant lightly to tting
threads. Connect approved exible gas
hose to gas regulator of heater (see Fig-
ure 11). Note: Never apply pipe sealant
to are tting threads. Hold gas regulator
with a wrench when connecting exible
gas hose.
6. Attach base assembly to replace oor
using two masonry screws provided in
hardware package (see Figure 11).
7. Connect to gas supply. See Connecting
To Gas Supply, page 13.
WARNING: You must secure
this heater to replace oor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak.
WARNING: If installing in a
sunken replace, special care
is needed. You must raise the
replace oor to allow access to
heater control panel. This will in-
sure adequate air ow and guard
against sooting and controls
being damaged. Raise replace
oor with noncombustible mate-
rial. Make sure material is secure.
CAUTION: Do not pick up
heater base assembly by burners.
This could damage heater. Only
handle base assembly by grates.
IMPORTANT: Make sure the heater burners
are level. If heater is not level, heater will not
work properly.
Installation Items Needed
• hardware package (provided with heater)
• electric drill with 3/16" masonry drill bit
1. Position heater base assembly in re-
place. Center base assembly left to right
and front to back inside replace.
INSTALLING HEATER BASE ASSEMBLY

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INSTALLATION
CONNECTING TO GAS SUPPLY
CAUTION: For natural gas,
check your gas line pressure
before connecting heater to gas
line. Gas line pressure must be
no greater than 10.5" WC. If gas
line pressure is higher, heater
regulator damage could occur.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting
into gas piping and/or ttings.
CAUTION: Use pipe joint
sealant that is resistant to gas
(Propane/LP or Natural Gas).
Before installing heater, make sure you have
the items listed below:
• external regulator for propane/LP unit only
(supplied by installer)
• piping (check local codes)
• sealant (resistant to natural gas and pro-
pane/LP gas)
• equipment shutoff valve*
• test gauge connection*
• sediment trap
• tee joint
• pipe wrench
• exible gas hose (check local codes)
* A CSA design-certied equipment shutoff
valve with 1/8" NPT tap is an acceptable al-
ternative to test gauge connection. Purchase
the optional CSA design certied equipment
shutoff valve from your dealer.
WARNING: A qualied ser-
vice technician must connect
heater to gas supply. Follow all
local codes.
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: Do not over-
tighten gas connections.
WARNING: For natural gas,
Never connect heater to private
(non-utility) gas wells. This gas is
commonly known as wellhead gas.
CAUTION: For propane/LP gas,
never connect heater directly to the
gas supply. This heater requires
an external regulator (not sup-
plied). Install the external regulator
between the heater and propane/
LP supply. Gas supplier provides
external regulator for natural gas.
The installer provides the external
regulator for propane/LP gas.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" diameter or greater to allow
proper gas volume to heater. If
pipe is too small, undue loss of
pressure will occur.

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INSTALLATION
Figure 13 - Gas Connection
Figure 12 - Attaching Flexible Gas Hose
to Heater Gas Regulator
Typical Inlet Pipe Diameters
Use 1/2" black iron pipe or greater. Installa-
tion must include an equipment shutoff valve,
union, and plugged 1/8" NPT tap. Locate
NPT tap within reach for test gauge hook up.
NPT tap must be upstream from heater (see
Figure 13).
IMPORTANT: Install an equipment shutoff
valve in an accessible location. The equip-
ment shutoff valve is for turning on or shutting
off the gas to the appliance.
For propane/LP installations, 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.
The installer must supply an external regula-
tor. The external regulator will reduce incom-
ing gas pressure. You must reduce incoming
gas pressure to between 11" WC and 14" WC.
If you do not reduce incoming gas pressure,
heater regulator damage could occur. Install
external regulator with the vent pointing down
as shown in Figure 14. Pointing the vent down
protects it from freezing rain or sleet.
Figure 14 - External Regulator
with Vent Pointing Down
External
Regulator with
Vent Pointing
Down
Propane/LP
Supply Tank
Approved Flexible Gas Hose
(if allowed by local codes)
CSA Design-Certied
Equipment Shutoff Valve
With 1/8" NPT Tap*
Flexible Gas Hose (if
allowed by local codes)
Fitting Heater Gas
Regulator
Sediment Trap
Cap Pipe Tee
Nipple Joint
3" Minimum
Install sediment trap in supply line as shown
in Figure 13. Place sediment trap where it is
within reach for cleaning. Place sediment trap
where trapped matter is not likely to freeze.
A sediment trap traps moisture and contami-
nants. This keeps them from going into heater
controls. If sediment trap is not installed or is
installed wrong, heater may not run properly.
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Correct
all leaks at once (see page 15).
Natural Gas
From Gas Meter
(5" W.C.** to 10.5"
W.C. Pressure)
Propane/LP
From External
Regulator
(11" W.C.** to 14" W.C.
Pressure)
* Purchase the optional CSA design-certied equipment
shutoff valve from your dealer.

www.usaprocom.com 15200068-01A
INSTALLATION
Figure 15 - Equipment Shutoff Valve
CHECKING GAS CONNECTIONS
Open
Closed
Equipment
Shutoff Valve
3. Check all joints from gas meter to equip-
ment shutoff valve for natural gas or
propane/LP supply to equipment shutoff
valve for propane/LP (see Figure 16 or 17).
Apply a noncorrosive leak detection uid
to all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Fig-
ure 15).
2. Open main gas valve located on or near
gas meter for natural gas or open pro-
pane/LP supply tank valve.
3. Make sure control knob of heater is in the
OFF position.
4. Check all joints from equipment shutoff
valve to control valve (see Figure 16 or 17).
Apply a noncorrosive leak detection uid
to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Lighting Instructions on
page 20 or 21). Check all other internal
joints for leaks.
7. Turn off heater (see To Turn Off Gas Ap-
pliance, page 21 or 22).
Control Valve
Location
Control Valve
Location
Equipment
Shutoff Valve
Equipment Shutoff Valve
External Regulator
Propane/LP
Supply Tank
Figure 16 - Checking Gas Joints for
Propane/LP Gas
Figure 17 - Checking Gas Joints for
Natural Gas
Gas Meter
WARNING: Test all gas piping
and connections, internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an open
ame to check .for a leak. Apply a
noncorrosive leak detection uid
to all joints. If bubbles form, there
is 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 heater with its appliance main
gas valve (control valve) and equipment
shutoff valve from gas supply piping sys-
tem. Pressures in excess of 1/2 PSIG will
damage heater regulator.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
4. Check all joints of gas supply piping sys-
tem. Apply noncorrosive leak detection
uid to all joints. If bubbles form, there
may be a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff
valve to gas supply. Check reconnected
ttings for leaks.
Test Pressures Equal To or Less
Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Fig-
ure 15).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.

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INSTALLATION
Figure 18 - Wiring Diagram
ELECTRICAL WIRING (MILLIVOLT)
CAUTION: Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous opera-
tion. Verify proper operation after servicing.
Note: The millivolt valve is a self-powered combination gas control that does not require
110 VAC to operate.
CONNECTING REMOTE RECEIVER
MODELS WZ(N,L)(18,24,30)MVA ONLY
Models WZ(N,L)(18,24,30)MVA can be connected to an aftermarket hand held remote receiver
(not supplied by ProCom Heating, Inc.)
Refer to the remote receiver manufacturer's installation Instructions and the Wiring Diagram
shown in Figure 18 for proper connection and use.
OPTIONAL POSITIONING OF THERMOSTAT SENSING BULB
For masonry and factory-built metal replace
Optional Wall Switch
or Remote Receiver
If your log set cycles to pilot, but the room
temperature drops to a lower than ideal
comfort level before the log set comes back
on, you may want to reposition the thermostat
sensing bulb.
The thermostat sensing bulb is located near
the gas valve assembly on the mounting
bracket. This location allows the thermostat
to keep the room temperature at an ideal
comfort level for most replace applications.
For positioning the thermostat sensing bulb
elsewhere, a mounting clip is available.
Tools needed: 1/4" hex driver or socket.
1. Remove logs. Locate the gas valve as-
sembly and thermostat sensing bulb.
LEARN
REMOTEOFF ON
Red
Red
White
Switch
Black
Green

www.usaprocom.com 17200068-01A
INSTALLATION
Figure 19 -Adhesive-Backed Mounting
Clip
Figure 20 - Removing Thermostat
Sensing Bulb
Figure 22 - Installing Thermostat
Sensing In Factory-Built Metal Fireplace
Figure 21 - Installing Thermostat Sensing
Bulb on Masonry Fireplace
Figure 23 - Installing Thermostat Sensing
Bulb behind Glass Door
Figure 24 – Position the Thermostat
Sensing Bulb in the Vertical Position
With Capillary at the Bottom
2. Remove the thermostat sensing bulb out
of the plastic clip (see Figure 22).
IMPORTANT: Do not force or bend the ther-
mostat sensing bulb or capillary.
3. The thermostat sensing bulb may be locat-
ed to the lower right front side of replace.
Determine location of sensing bulb, but
do not mount sensing bulb until step 5. If
you have a masonry replace, (see Figure
21 for location). If you have a factory-built
metal replace, see Figure 20 for location.
If your replace has glass doors, position
sensing bulb directly behind door gap on
right bottom side (see Figure 23).
4. The mounting clip must be a minimum
of 3" from bottom of replace to prevent
crimping of capillary. Once you have de-
cided on a location, thoroughly clean the
area. Remove the paper backing from the
adhesive on back of mounting clip (pro-
vided with the heater in hardware pack-
age) (see Figure 19). Press the clip into
the new location so that the thermostat
sensing bulb will be positioned vertically
with the capillary at the bottom (see Figure
24). Slide the thermostat sensing bulb into
the clip.
Thermostat
Sensing Bulb
Adhesive-Backed
Mounting Clip
Thermostat
Sensing Bulb
Thermostat
Sensing Bulb
Adhesive-Backed
Mounting Clip
Adhesive-Backed
Mounting Clip
Capillary
Thermostat
Sensing Bulb
Adhesive-Backed
Mounting Clip
Do Not Crimp
Capillary
Glass Doors
Plastic Clip
Gas Valve
Assembly
Thermostat
Sensing Bulb
Mounting
Bracket

www.usaprocom.com 200068-01A18
INSTALLATION
INSTALLING LOGS
WARNING: Failure to posi-
tion the parts in accordance
with these diagrams or failure
to use only parts specically
approved with this heater may
result in property damage or
personal injury.
CAUTION: After installation
and periodically thereafter,
check to ensure that no yellow
ame comes in contact with any
log. With the heater set to High,
check to see if yellow ames
contact any log. If so, reposi-
tion logs according to the log
installation instructions in this
manual. Yellow ames contact-
ing logs will create soot.
Figure 26 - Installing Logs #1, #2, #3 and #4
(WZL30MVA Shown)
Figure 25 - Log Base (WZL30MVA Shown)
It is very important to install the logs exactly
as instructed. Do not modify logs. Use only
logs supplied with heater.
Each log is marked with a number. This
number will help you to identify the logs when
installing.
After installing logs, add decorative cinders
around the grate base, do not place any
decorative cinders on logs or burner.
1. Insert pins on the back of log #1 into the
slots on the rear log bracket on the back
of the grate base (see Figure 26).
2. Insert pins on the back of log #2 into the
slots on the left side of the middle log
bracket (see Figure 26).
3. Insert pins on the back of log #3 into the
slots on the right side of the middle log
bracket (see Figure 26).
4. Insert pins on the back of log #4 into
the slots on the left side of the front log
bracket (see Figure 26).
Log #1 Log #2 Log #3
Rear Log Bracket
Middle Log Bracket
Front Log Bracket
Log #4

www.usaprocom.com 19200068-01A
OPERATION
WARNING: If you do not fol-
low these instructions exactly,
a re or explosion may result
causing property damage, per-
sonal injury or loss of life.
A. This appliance has a pilot which must
be lighted by hand. When lighting the
pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around
the appliance area for gas. Be sure to
smell next to the oor because some
gas is heavier than air and will settle
on the oor.
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 re department.
C. Use only your hand to push in or turn
the gas control knob. Never use tools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualied service technician. Force or
attempted repair may result in a re or
explosion.
D. Do not use this appliance if any part
has been under water. Immediately call
a qualied service technician to inspect
the appliance and to replace any part of
the control system and any gas control
which has been under water.
FOR YOUR SAFETY READ BEFORE LIGHTING
Avoid any drafts that alter burner ame
patterns. Do not allow fans to blow directly
into the replace. Do not place a blower inside
the burn area of the rebox. Ceiling fans may
create drafts that alter ame patterns. Sooting
and improper burning will result.
During manufacturing, fabricating and ship-
ping, various components of this appliance
are treated with certain oils, lms or bonding
agents. These chemicals are not harmful but
may produce annoying smoke and smells as
they are burned off during the initial operation
of the appliance, possibly causing headaches
or eye or lung irritation. This is a normal and
temporary occurrence.
The initial break-in operation should last four
to six hours with the burner at the highest
setting. Provide maximum ventilation by
opening windows or doors to allow odors to
dissipate. Any odors remaining after this initial
break-in will be slight and will disappear with
continued use.
This appliance must not be used with glass
doors in the closed position. This can lead
to pilot outages and severe sooting outside
the replace.
Always operate heater with glass doors fully
open.
INSTALLATION
5. Place log #5 on the top of log #1 and log
#2, inserting pin in log #1 into the hole in
the bottom of log #5 (see Figure 27).
6. Place log #6 on the top of log #1 and log
#3, inserting pin in log #1 into the hole in
the bottom of log #6. Be sure the opposite
end of log #6 aligns with the recess in log
#3 (see Figure 27).
7. Add lava rocks around the grate base of
heater. Do not place any lava rocks on
logs or burner.
Log #5 Log #6
Figure 27 - Installing Logs #5 and #6
(WZL30MVA Shown)

www.usaprocom.com 200068-01A20
WARNING: You must oper-
ate this heater with the screen
in place. Make sure screen is
installed before running heater.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange ame will also be pres-
ent. Open damper or window to
vent smell. This will only last a
few hours.
1. STOP! Read the safety information,
page 19.
2. Make sure equipment shutoff valve is fully
open.
3. This gas log set is equipped with an igni-
tion device (piezo) which automatically
lights the pilot. If the piezo ignitor does
not light the pilot, see Manual Lighting
Procedure, page 21.
4. Turn control knob clockwise to the
OFF position. Set the ame control to the
lowest setting.
5. Wait ve (5) minutes to clear out any gas.
Then smell for gas around heater and near
the oor. If you smell gas, STOP! Follow
"B" in the safety information, page 19. If
you do not smell gas, go to the next step.
6. From the OFF position, turn the control
knob counterclockwise to the IGN
position. Press in control knob for ve (5)
seconds.
Note: The rst time that the heater is
operated after connecting the gas supply,
the control knob should be pressed for
about thirty (30) seconds. This will allow
air to bleed from the gas system. If pilot
does not stay lit, refer to Troubleshooting,
pages 25 though 28. Also contact a quali-
ed service technician or gas supplier for
repairs. Until repairs are made, light pilot
with match.
• If control knob does not pop up when
released, contact a qualified service
technician or gas supplier for repairs.
7. With control knob pressed in, push
down and release ignitor button. This
will light pilot. The pilot is attached to
the rear of the burner. If needed, keep
pressing ignitor button until pilot lights.
Note: If pilot does not stay lit, refer to
Troubleshooting, pages 25 though 28.
Also contact a qualied service technician
or gas supplier for repairs. Until repairs
are made, light pilot with match. To light
pilot with match, see Manual Lighting
Procedure, page 21.
8. Keep control knob pressed in for 60 sec-
onds to prevent the ame detector from
shutting off the gas while the probe is
warming up. The exciter ring on the pilot
tube must glow red before the burners can
be lit. After 60 seconds, release control
knob.
Note: If pilot goes out, repeat steps 4
through 8. Wait one (1) minute before
lighting pilot again.
9. Turn control knob counterclockwise
to the ON position. The main burner
should light.
Note: Please wait one minute after shut-
ting off heater to allow the control valve
to reset before starting again.
10. After the pilot has been lit for one minute,
the burners can be turned on. Turn the
ON/OFF switch to the ON position or ad-
just the thermostat to the desired setting.
MILLIVOLT CONTROL MODELS (MVA)
LIGHTING INSTRUCTIONS
OPERATION
Ignitor
Button Manual/
Remote
Switch
Control
Knob
Flame
Control
Knob
Figure 28 - Ignitor Button and Control
Knob Locations