Monessen Hearth GCUF Series User manual



710530
GCUF cover
       
      


        
     

 
  
  

     


  

     
    


      
     
Do Not Build a Wood Fire.

     
     



   



Installation and
Operating Instructions
71D0530 1/11 Rev. 7

71D0530

GCUF Vent-Free Fireboxes 






Before You Start ......................................................5
What You Will Need for Installation .........................5







 

Optional AK-4 Outside Air Kit ................................13
Model 403 Duct Connector ...................................14




3
71D0530
GCUF Vent-Free Fireboxes
13. Correct installation of the ceramic ber logs, proper
location of the heater, and annual cleaning are neces-
sary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the replace. See log place-
ment instructions for proper installation.
14. Avoid any drafts that alter burner ame patterns. Do not
allow fans to blow directly into replace. Do not place
a blower inside burn area of rebox. Ceiling fans may
create drafts that alter burner ame patterns. Sooting
and improper burning will occur.
15.  Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free appli-
ances will not lter or clean soot produced by these
types of products. In addition, the smoke and/or aro-
matics (scents) may be reburnt in the vent-free appli-
ance which can produce odors. It is recommended to
minimize the use of candles, incense, etc. while the
vent-free appliance is in operation.
16. An unvented gas-red heater uses air (oxygen) from
the room in which it is installed. Provisions for adequate
combustion and ventilation air must be provided. See
installation guidelines.
17. Keep room area clear and free from combustible
materials, gasoline and other ammable vapors and
liquids.
18. Unvented gas heaters are a supplemental zone heater.
They are not intended to be a primary heating appli-
ance.
19. Unvented gas heaters emit moisture into the living
area. In most homes of average construction, this
does not pose a problem. In houses of extremely
tight construction, additional mechanical ventilation is
recommended.
0. During manufacturing, fabricating and shipping, 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.

8.    Early signs of
carbon monoxide poisoning are similar to the u with
headaches, dizziness and/or nausea. If you have these
signs, obtain fresh air immediately. Have the heater
serviced as it may not be operating properly.
9. The installation must conform with local codes or, in
the absence of local codes, with the National Fuel Gas
Code, ANSI Z3.l/NFPA54.
10. This unit complies with ANSI Z1.91 ventless rebox
enclosures for gas-red unvented decorative room
heaters.
11. Do not install the unvented heater in a bathroom.
1. Do not install the unvented heater in a bedroom unless
the maximum input rating is equal to or less than
10,000 Btu/hr.
Continued on page 4

Please leave these instructions with the appliance.

Please retain these instructions for future reference .

 
 

 

             

1. Due to high temperatures, the rebox should be
located out of trafc and away from furniture and
draperies.
. Children and adults should be alerted to the hazard
of high surface temperature and should stay away
to avoid burns or clothing ignition.
3. Young children should be carefully supervised when
they are in the same room with the rebox.
4. Do not place clothing or other ammable material
near the replace when the rebox is in use.
5. Any safety screen or guard removed for servicing,
must be replaced prior to operating a heater within
the rebox.
6. Installation and repair should be done by a qualied
service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater/rebox should be cleaned at least annu-
ally by a professional service person. More frequent
cleaning may be required due to excessive lint from
carpeting, etc. It is imperative that control compart-
ments, burners and circulating air passageways be
kept clean.

71D0530
4
GCUF Vent-Free Fireboxes 
Continued from page 3
The initial break-in operation should last two to three
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 period will be slight and will disappear
with continued use.
1. Input ratings are shown in BTU per hour and are for
elevations up to ,000 feet. For elevations above ,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel
Gas Code.
. The appliance and its appliance main gas valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test pres-
sures in excess of 1/ psig (3.5 kPa).
3. The appliance must be isolated from the gas supply
piping system by closing its equipment shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/ psig
(3.5 kPa).
4. Do not use this room 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.
5. Never burn solid fuels in a replace where a unvented
room heater is installed.
6. Always have a replace screen in place when the
appliance is in operation, and unless other provisions
for combustion air are provided, the screen shall have
an opening(s) for induction of combustion air.
7. Do not ll spaces around the rebox with insulation or
other materials. These spaces must be maintained to
prevent the rebox from coming in contact with com-
bustible materials.
Nous recommandons que nos
appareils de chauffage au gaz
soient installés et entretenus par
des professionnels qui ont été
accrédités aux È.U. par le National
Fireplace Institute ® (NFI) comme
étant des spécialistes du NFI en
matièred’appareils de chauffage
au gaz.

       






     
   

    

   
    
     


5
71D0530
GCUF Vent-Free Fireboxes

The new GCUF and GRUF Series are vent-free reboxes.
They feature a self contained heat-circulating system.
These units also feature a -in1, exible-face system, sold
as an accessory, that converts the circulating system into
a radiant system in seconds.
This installation manual will enable you to obtain a safe,
efcient and dependable installation of your vent-free
replace system.
Do not alter or modify the rebox or its components under
any circumstances. Any modication or alteration of the
rebox system, including but not limited to the rebox and
accessories, may void the warranty, listings and approvals
of this system and could result in an unsafe and potentially
dangerous installation.

Carefully inspect the contents for shipping damage. If any
parts are missing or damaged, immediately inform the
dealer from whom you purchased the appliance. Do not
attempt to install any part of the appliance unless you have
all the parts in good condition.


Check your packing list to verify that all listed parts have
been received. You should have the following:
1. Vent-Free Gas Firebox
. Canopy
3. Installation and Operating Instructions
4. Five (5) sheet metal screws for canopy


• Phillips screwdriver • Square
• Framing materials • Hammer
• Saw and / or saber saw • Tee joint
• Level • Pipe wrench
• Measuring tape • Pliers
• Electric drill and bits
• Fireplace surround materials (noncombustible)
• Caulking material (noncombustible)
• Wall nishing materials
• Piping complying with local codes
• Pipe sealant approved for use with propane/L.P.G.
(resistant to sulfur compounds)
Refer to the installation instructions provided with the log
sets for items required for log set installation.
In planning the installation for the appliance it is necessary
to determine where the unit is to be installed and whether
optional accessories are desired. Gas supply piping should
also be planned. The following steps represent the normal
sequence of installation. Each installation is unique, how-
ever, and might require a different sequence.
1. Position rebox prior to framing or into prepared fram-
ing.
. Field wire main power supply to models with fan kit.
(Electrical connections should only be performed by an
experienced, licensed /certied tradesman).
3. Plumb gas line. (Gas connections should only be per-
formed by an experienced, licensed/certied trades-
man).
4. Install vent-free gas log heater per the instructions
provided with the vent-free gas log heater.
5. Complete nish wall material, surround and optional
hearth extension to your individual taste.

71D0530
6
GCUF Vent-Free Fireboxes 
256O”B
256O”
A
Rough
Opening
Height
D
F
C
Rough
Opening
Depth
M - Rough Opening Width 1/2” - 5/8”
O
Q
P
P
R
710530
GCUF dims
I
156M”
6”
16QE”
5(6QE”
N216M”
E
H
J
L
G
K
   
A 37" 41" 47"
B 3" 36" 4"
C 16" 18" 18"
D 9" 3" 38"
E 18B\," 0B\," 0B\,"
F 3C\," 7C\," 33C\,"
G 13Z\v" 15C\v" 15C\v"
H 18" 17B\," 17B\,"
I 9M\," 34" 40"
J 7Z\," 9C\v" 9C\v"
K 8" 8Z\v" 8Z\v"
L C\v" Z\v" Z\v"
M 37Z\v" 41Z\v" 47Z\v"
N 35" 35" 35"
O 15Z\x" 17Z\x" 17Z\x"
P 43C\v" 48C\v" 53"
Q 61C\v" 68M\," 74M\,"
R 30M\," 34Z\x" 37Z\x"
Figure 1 -
Firebox and Framing Dimensions

7
71D0530
GCUF Vent-Free Fireboxes

A
B
C
DE
FP2901
hearth dims
   
A 9M\," 34" 40"
B 13Z\v" 15C\v" 15C\v"
C 3C\," 7C\," 33C\,"
D 1M\," 1M\," 1M\,"
E 18" 17B\," 17B\,"
Figure 2 -
Minimum Hearth Dimensions

Carefully select the best location for installation of your
vent-free rebox. The following factors should be taken
into consideration:
• Clearance to side wall, ceiling, woodwork and windows.
See “Clearances/Height Requirements on page 8.
Minimum clearances to combustibles 

• Location must not be affected by drafts caused by
kitchen exhaust fans, ceiling fans, return air registers
for forced air furnaces / air conditioners, windows or
doors.
• Installation must provide adequate ventilation and com-
bustion air.
• 

• Location should be out of high trafc or windy or drafty
areas.
• 


• Never obstruct the front opening of the vent-free rebox
or restrict the ow of combustion and ventilation air.
• Minimize modications to existing construction. Refer
to Figure 3 below for location suggestions.
• Do not install in the vicinity where gasoline or other
ammable liquids may be stored. The vent-free rebox
must be kept clear and free from these combustible
materials.
FP2440
fireplace locations
Figure 3 -
Location of Firebox
FP440

71D0530
8
GCUF Vent-Free Fireboxes
Ensure that minimum clearances shown in Figures 4
through 8 are maintained. Left and right clearances are
determined when facing the front of the rebox.
Follow these instructions carefully to ensure safe instal-
lation. Failure to follow these requirements may create a
re hazard.
1. The clearance from the inside
of the appliance to any combustible wall should not be
less than 9". Figure 4
. The ceiling must be at least 4”
from the top of the rebox opening. Figure 4
3.   The appliance may be placed
against a combustible back wall.

9"
Minimum
42"
Minimum
9"
Minimum
FP2687
minimum clearances
FP687
Figure 4 -
Clearance and Height Requirements
4. The canopy supplied with the unit
must be installed. If a combustible mantel is installed,
it must meet the clearance requirements as shown in
Figure 5. However, if lower mantel height is desired,
refer to Page 14, Figure 6.
12”
10”
8”
6”
256O”
12”
16”
19”
21”
23”
FP2690
Mantel clearances
Combustible
Material Can
Contact Top
of Fireplace
FP690
Noncombustible Material
Only if Needed to Cover
Radiant Top Face
Figure 5 -
Mantel Clearances
12”
8”
8”
14”
FP2691
mantel clear wide canopy
FP691
Figure 6 -
Mantel Heights for Wide Prole Canopy
45°
1”
256O”
3”
5”
6”
56O”
56O”
56O”
FP2692
mantel leg clearance
6”
756O”
756O”
9”
Finish Wall
Combustible
Material Area
FP69
Figure 5a -
Mantel Leg Clearance

9
71D0530
GCUF Vent-Free Fireboxes
FP2688
min floor combustible
5" Minimum
Combustible
Material
FP688
Figure 7 -
Minimum Clearance Above
Combustible Flooring

14” Minimum
FP2689
min floor clear noncomb
Can be Less
Than 5" Noncombustible
Material
FP689
Figure 8 -
Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace

Firebox framing can be built before or after the appliance
is set in place. Construct rebox framing following Figure
1 for your specic installation requirements. See Figure 1
on Page 6 for rebox dimensions. The framing headers
may rest on the top of the rebox.
The rebox may be installed directly on a combustible oor
or raised on a platform of an appropriate height. When
the rebox is installed directly on carpeting, tile, or other
combustible material, other than wood ooring, the rebox
shall be installed on a metal or wood panel extending the
full width and depth of the enclosure.
The classication "noncombustible material" includes, but
is not limited to: stone, brick, and mortar. Noncombustibles
are safe to overlay the black-painted metal face, including
radiant plates, and do not pose a re hazard. Any noncom-
bustible nish material must not extend past or interfere
with the replace opening.
The classication "combustible material" incudes, but is
not limited to: plywood, drywall, and particle board. Com-
bustible materials may contact the sides, bottom, or back
of the rebox. Do not overlay the black painted face with
combustible materials.

      
     


      
    

 This inner chamber rebox oor must
be installed at least 5" above any combustible ooring
material, such as carpeting or asphalt tile, which is
closer than 14" to the base of the rebox. Figure 7
OR
The inner chamber rebox oor may be installed nearer to
the oor if a minimum of 14" of noncombustible ma terial
such as slate or marble is installed between the base of
the rebox and the combustible ooring. Figure 8

71D0530
10
GCUF Vent-Free Fireboxes 
When nishing a custom cabinet, mantel, or other built-in
enclosure, the opening size to accommodate the replace
with trim installed is as follows:
Figure 10 -
Custom Cabinet
A
B
FP2694
custom cabinet
   
    
A 37M\," 41M\," 47M\,"
B 35M\," 35M\," 35M\,"

A canopy is furnished with each rebox and MUST be
installed for safe operation. Figure 11
1. Align the canopy with the holes in the top frame.
. Secure the screws as shown.
3. Tighten side screws. Make sure the canopy is level and
secure.
Figure 11 -
Installing Canopy
FP2451
install canopy
Screws
Canopy FP451


       
    


    


1. Bend out the nailing anges located on each side of the
rebox.
. Slide the rebox into prepared framing or position rebox
in its nal position and frame later.
3. Level the rebox by checking the top edge of the rebox.
Shim if necessary.
4. Anchor rebox to the side framing members using 8d
nails or other suitable fasteners. Figure 9.
5. The canopy must be installed for safe operation of the
heater.
FP2902
nailing flanges
Nail Sides Through
Nailing Flanges
FP90
Figure 9 -
Location of Nailing Flanges