MHSC VWFOD24 User manual
This gas log set is to be installed only in a
solid-fuel burning fireplace with a working flue
constructed of noncombustible material.
CSA-4.96
CSA-CR97-003 (NG Only)
Approved for outdoor use
0546
VWFOD cover
20300546 1/10 Rev. 1
Improper installation, adjustment,
alteration, service or maintenance can cause
injury or property damage. Read the installa-
tion, operating and maintenance instructions
thoroughly before installing or servicing this
equipment.
220300546
VWFOD Vented Outdoor Gas Log Set
Installation in a Fireplace with Restrictive Barrier ... 5
Damper Stop Installation ........................................ 6
Check Gas Type ..................................................... 7
Install Gas Line ....................................................... 8
VWF24 Massive Oak Log ...................................... 9
VWF30 Massive Oak Log .....................................11
VWF24 American Oak Log .................................. 12
VWF30 American Oak Log .................................. 13
VWF30/24 Split River Oak Log ........................... 15
VWF36/30 Split River Oak Log ........................... 17
VWF24 Split Pine ................................................ 18
VWF30 Split Pine ................................................ 20
VWF30/24WP Weathered Pine Log .................... 22
WF36/30WP Weathered Pine Log ....................... 24
Manual Match Control Lighting ............................ 25
Flame Appearance ............................................... 26
Assembly .............................................................. 29
Massive Oak Logs ................................................ 30
American Oak Logs .............................................. 31
Split River Oak Logs ............................................. 32
Split Pine Logs ..................................................... 33
Weathered Pine Logs ........................................... 34
3
20300546
VWFOD Vented Outdoor Gas Log Set
1. The installation, combustion and ventilation air must
conform with local codes or, in the absence of local
codes, with the National Fuel Gas Code, ANSI Z223.1,
or the CSA-B149 Installation code (series). This unit
complies with CSA-4.96 US and CR97-003, Outdoor
Fireplaces for installation in solid-fuel burning fire-
place.
2. Installation and repair should be done by a qualified
service person. MHSC Vented Gas Logs must be
installed only in a masonry or a UL-127 solid-fuel
fireplace with minimum venting requirements, see
installation section.
3. To prevent malfunction, gas log set and flue should
be cleaned at least annually by a professional service
person. More frequent cleaning may be required due
to excessive lint from carpeting, etc. It is imperative
that control compartments, burners and circulating air
passageways be kept clean.
5. Never burn solid fuels in a fireplace where a gas log
set is installed.
6.
A fireplace screen must be
in place when the log set is burning. Provisions for
adequate combustion air must be provided. Adequate
combustion air usually results in all flames curling into
the fireplace away from the screen and up the flue.
8. Keep room area clear and free from combustible
materials, gasoline and other flammable vapors and
liquids.
9. Children and adults should be alerted to the hazard
of high surface temperature and should stay away to
avoid burns or clothing ignition.
10. Young children should be carefully supervised when
they are in the same room with the gas log set in opera-
tion.
11. Do not place clothing or other flammable material near
the fireplace when the gas logs are in use.
12. Do not use this gas log set if any part has been under-
water. Immediately call a qualified service technician
to inspect the gas logs and replace any part of the
control system and any gas control which has been
under water.
13. The gas log set
must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 psig (3.5kPa).
14. Secure gas log set to fireplace.
15. This log set will burn off the paint on the front grate
bar. See cleaning section for refurbishing.
16. Inspect the burner before each use of the appliance.
The burner must be replaced prior to operation if there
is evidence the burner is damaged. Use only burner
specified by manufacturer.
LP-cylinder enclosures, if provided by the consumer must
conform to the design parameters as detailed on Page 4.
Installation of this vented gas log in the Common-
wealth of Massachusetts requires the damper be
permanently removed or welded in the full open
position. In addition, a naturally vented gas log may
not be installed in a bedroom or bathroom in the Com-
monwealth of Massachusetts. Flex line installation
must not exceed 36".
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
420300546
VWFOD Vented Outdoor Gas Log Set
Check your packing list to verify that all listed parts have
been received. You should have the following:
• Burner and Valve Assembly
• Grate
• Lava Rocks (x 4)
• Extenders with Knob
• Damper Clamp
• Installation /Operating Instructions
• 3/8" Aluminum tube with 3/8" 90° elbow, 1/2" to 3/8"
tube fitting
• 4, Mounting Screws
• Regulator (LP Only)
• Individual Logs
Carefully inspect the contents for shipping damage. If any
parts are missing or damaged, immediately inform the
dealer from whom you purchased the appliance.
Ensure that the following items are available before pro-
ceeding with installation:
• External regulator (for propane/L.P.G. only)
• Shutoff valve
• Piping which complies with local codes
• Pipe wrench
• Pipe sealant approved for use with propane/L.P.G.
(Resistant to sulfur compounds)
• Drill with masonry bit (for mounting to the floor)
Natural Propane (LP)
Inlet Minimum 4.0” w.c. 10.0” w.c.
Inlet Maximum 10.0” w.c. 13.0” w.c.
VWF24N Nat. Manual 90,000
VWF24P LP Manual 60,000
VWF30N Nat. Manual 90,000
VWF30P LP Manual 60,000
Actual performance, flame height, Btu/hr will vary
with specific installation, gas pressure, shutoff valve position
(fully open), valve type, and firebox draft conditions.
Enclosures for LP-gas supply cylinders shall be ventilated by
openings at the level of the cylinder valve and at floor level. The
effectiveness of the opening(s) for purposes of ventilation shall
be determined with the LP-gas supply cylinder(s) in place. This
shall be accomplished by one of the following:
a. One side of the enclosure shall be completely open; or
b. For an enclosure having four sides, a top and a bottom:
1. At least two ventilation openings at cylinder valve level shall
be provided in the side wall, equally sized, spaced at 180
degrees (3.14rad), and unobstructed. Each opening shall
have a total free area of not less than 1/2 square inch per
pound (3.2 sq. cm/kg) of stored fuel capacity and not less
than a total free area of 10 square inches (64.5 sq. cm).
2. Ventilation opening(s) shall be provided at floor level and
shall have a total free area of not less than 1/2 square inch
per pound (3.2 sq. cm/kg) of stored fuel capacity and not
less than a total free area of 10 square inches (64.5 sq. cm).
If ventilation openings at floor level are in a side all, there
shall be at least two openings. The bottom of the openings
shall be at floor level and the upper edge no more than 5
inches (127 mm) above the floor. The openings shall be
equally sized, spaced at 180 degrees (3.14 rad) and un-
obstructed.
3. Every opening shall have minimum dimensions so as to
permit the entrance of a 1/8 inch (3.2 mm) diameter rod.
Cylinder valves shall be readily accessible for hand operation.
A door on the enclosure to gain access to the cylinder valves is
acceptable, provided it is non-locking and can be opened without
the use of tools.
There shall be a minimum clearance of 2 inches (51 mm) between
the lower surface of the floor of the LP-gas supply cylinder en-
closure and the ground.
The design of the appliance shall be such that (1) the LP-gas
supply cylinder(s) can be connected, disconnected and the con-
nections inspected and tested outside the cylinder enclosure; and
(2) those connections which could be disturbed when installing
the cylinder(s) in the enclosure can be leak tested inside the
enclosure.
5
20300546
VWFOD Vented Outdoor Gas Log Set
6' 64 sq in
8' 64 sq in
10' 64 sq in
15' 51 sq in
20' 51 sq in
30' 51 sq in
A
B
C
FP2641
min hearth dims
VWFOD24 27" 13Z\x" 30"
(686 mm) (343 mm) (762 mm)
VWF0D30 33" 13Z\x" 36"
(838 mm) (343 mm) (314 mm)
FP2641
The following are guidelines for placing a gas log set in
a fireplace that has a restrictive barrier along the bottom
front opening of the fireplace. Some examples of barri-
ers are glass/screen door frames and sunken/recessed
fireplaces.
No Restriction 13”
1/2” to 1Z\x” 15”
Greater than 1Z\x” to 3” 15”
Greater than 3” *
*Any barrier greater than 3” placed in front of the gas log
set is not recommended by the manufacturer.
Non combustible material such as refractory brick
may be used to line the floor of the fireplace in order to raise
the height of the gas log set in relation to a restrictive barrier.
If the unit is raised, the minimum height dimension listed in
the homeowner’s manual must not be exceeded.
FP2642
fireplace w barrier
X
Glass door
frames with
adjustable
louvers should
have the lovers
while the unit is
in operation
= Height of restrictive barrier caused by
glass door frames, recessed fireplaces, etc.
from the base or bottom surface of the unit.
(Refer to Table).
The log set should be
placed against or as
near as possible to the
rear wall of the fireplace/
firebox.
Depth of
fireplace/
firebox. (Refer
toTable).
620300546
VWFOD Vented Outdoor Gas Log Set
• Turn off gas supply to fireplace or firebox.
• Clean the fireplace floor and chimney before install-
ing the log set. Seal any ash clean-out doors to
protect the unit from down drafts.
1. Place grate/burner assembly into firebox with the
front pan facing forward.
2. Drill two (2) 5/32" diameter holes approximately 1Z\x"
deep.
3. Anchor the front pan to the floor using the screws pro-
vided.
A damper stop must be provided with the unit. The damper
stop must be installed as shown in Figure 3 to prevent
full closure of the fireplace damper blade and provide a
minimum flue opening, per table on page 5.
Should the clamp not fit, or provide the required permanent
opening from the table, have the damper cut to provide
a minimum permanent opening or install a permanent
stop.
Installation of this vented gas log set in the Commonwealth
of Massachusetts requires the damper be permanently
removed or welded in the fully open position. In addition, a
naturally vented gas log may not be installed in a bedroom
or bathroom in the Commonwealth of Massachusetts.
FP2370
damper
Damper Stop
Damper
FP2370
FP2643
secure grate
Screws FP2643
7
20300546
VWFOD Vented Outdoor Gas Log Set
Use proper gas type for the log set you are installing. If you have conflicting gas type, do not install
log set. See dealer where you purchased the log set for proper log set for your gas type or conver-
sion kit.
Before installing the burner system, make sure you have the items listed below.
• External regulator • Piping (check local codes) • Sealant (resistant to propane/LP gas)
(supplied by installer) • Test gauge connection* • Sediment trap (recommended)
• Equipment shutoff valve* • Tee joint • Pipe wrench
• approved flexible gas line with gas connector (if allowed by local codes — not provided)
* A CSA design-certified equipment shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge con-
nection. Purchase the CSA design-certified equipment shutoff valve from your dealer.
For propane/LP connections only, the installer must supply an external regulator. The external regulator will reduce
incoming gas pressure. You must reduce incoming gas pressure to between 11 and 13 inches of water. If you do
not reduce incoming gas pressure, burner system regulator damage could occur. Install external regulator with the
vent pointing down as shown in Figure 7. Pointing the vent down protects it from freezing rain or sleet.
FP1977
external regulator
FP1977
External
Regulator
100 lb. (min)
Propane/LP
Supply Tank
Vent Pointing
Down
When using copper or flex connectors use only fittings
approved for gas connections. The gas control inlet is
3/8" NPT.
820300546
VWFOD Vented Outdoor Gas Log Set
Figure 6
A listed manual shutoff valve must be installed upstream of the appliance. Union tee and plugged 1/8"
NPT pressure tapping point should be installed upstream of the appliance. Figure 6
Install main gas valve (equipment shutoff valve) in an accessible location. The main
gas valve is for turning on or shutting off the gas to the
fireplace.
Check your building codes for any special requirements
for locating equipment shutoff valve to fireplaces.
Apply pipe joint sealant lightly to male threads. This will
prevent excess sealant from going into pipe. Excess seal-
ant in pipe could result in clogged burner system valves.
3" Minimum
FP1978
gas connection
Approved Flexible
Gas Line
CSA Design-Certified Equipment Shutoff Valve
with 1/8" NPT Tap*
From Gas Meter
(4.5" w.c. to 10.5" w.c. Pressure)
From External Regulator
(11" w.c. to 13" w.c. Pressure)
9
20300546
VWFOD Vented Outdoor Gas Log Set
Fill the burner pan with lava rock to the bottom of the grate bars and sloped to the front edge of the
burner pan. Excess lava rock can spill forward or to the side of the burner pan. Do not overfill the
propane model. The lava rock may also be used to cover the front and side areas of the fireplace
floor.
LG777
VWF24 rear log
Rear Log #1
LG777
1. Center rear log #1 on grate bars and flush
with rear of the grate. Figure 7
Front Left Log
#2
Front Right Log
#3
LG778
VWF24 right left log
LG778
2. Place front left log #2 on the front of the grate
and to the left. Figure 8
3. Place front right log #3 on the front of the grate
and to the right. Figure 8
4. Install left side middle log #4.
Figure 9
LG828
VWF24MO log 4
Left Side Middle Log #4
LG828
10 20300546
VWFOD Vented Outdoor Gas Log Set
5. Install right side middle log #5. Figure 10
6. Install left top log #7 as shown. Figure 10
LG779
VWF24 top left right logs
Right Side Middle Log
#5
Left Top Log
#7
LG779
LG780
VWF24 right top log
Right Top Log #6
LG781
7. Install right top log #6 as shown. Figure
11
11
20300546
VWFOD Vented Outdoor Gas Log Set
1. Center rear log #1 on grate bars and flush with rear of
the grate. Figure 12
LG781
VWF30 rear log
Rear Log #1
LG781
LG782
VWF30 left right front logs
Front Left Log #2
Front Right Log #3
LG782
2. Place front left log #2 on the front of the grate and to
the left. Figure 13
3. Place front right log #3 on the front of the grate and to
the right. Figure 13
Allow 2" between the back log and the two front
logs.
LG783
VWF30 right left mid log
Left Middle Log #4
Right Middle Log #5
LG783
4. Install left middle log #4 as shown.
Figure 14
5. Install right middle log #5 as shown.
Figure 14
LG784
vWF30 top logs
Right Top Log #6
Left Top
Log #7
Top Crossover Log #8
LG783
6. Install right top log #6 as shown. Figure 15
7. Install left top log #7 as shown. Figure 15
8. Install top crossover log #8 as shown. Figure 15
12 20300546
VWFOD Vented Outdoor Gas Log Set
LG785
VWF24AO back log
Back Log #2
LG785
LG786
VWF24AO front log
Front Log #1
LG786
1. Place Back Log #2 on
grate bars on back of
grate. Figure 16
2. Place Front Log #1 on front of grate. Figure 17
Allow 2" between back and front logs.
LG787
VWF24AO right left log
Right Log #3
Right/Left
Log #4
LG787
3. Place Right Log #3 on top right of Log
#1 and Log #2. Figure 18
4. Place Right/Left Log #4 on top left of
Log #1 and Log #2. Figure 18
LG788
VWF24AO top logs
Top Left Log
#6
LG788
Right/Left Log #4
5. Rest Right/Left Log #4 on Log # 3 and
Log #1. Figure 19
6. Rest Top Left Log #6 on Log #4 and Log
#1. Figure 19
Each log has an identifying number
embossed on bottom surface.
13
20300546
VWFOD Vented Outdoor Gas Log Set
Each log has an identifying number
embossed on bottom surface.
LG789
VWF30AO back log
Back Log #2
LG789
1. Place Back Log #2 on grate
bars on back of grate. Figure
20
LG790
VWF30AO front log
Front Log #1
LG790
2. Place Front Log #1 on front of grate. Figure 21
Allow 2" between back and front logs.
LG791
VWF30AO middle logs
Right/Left Middle
Log #4
Right/Left
Middle Log #4
LG791
3. Place Right/Left Middle Log #4 on top
right of Log #1 and Log #2. Figure 22
4. Place Right/Left Middle Log #4 on top left
of Log #1 and Log #2. Figure 22
14 20300546
VWFOD Vented Outdoor Gas Log Set
LG794
VWF30AO right cross log
(continued)
LG792
VWF30AO top left right logs
Top Right/Left
Log #5
Top Right/Left
Log #5
LG792
5. Place Top Right/Left Log #5 on Log # 4
and Log #1. Figure 23
6. Place Top Right/Left Log #5 on Log 4
and Log #1. Figure 23
LG793
VWF30AO left cross log
Left Crossover
Log #7
LG793
7. Place Left Crossover Log #7 on Log #2
and Log #5. Figure 24
Right Crossover
Log #8
LG794
8. Place Right Crossover Log #8 on Log
#5 and Log #7. Figure 25
15
20300546
VWFOD Vented Outdoor Gas Log Set
LG795
VWFSRO rear log
Back Log #1
LG795
1. Place Back Log #1 on back of
grate. Figure 26
LG796
VWFSRO bottom logs
Bottom Right
Log #3
Bottom Left
Log #2
Left Arm
of Grate
Third Prong
Second Prong
LG796
Lg797
VWFSRO top right log
Top Right Log #4
LG797
2. Place Bottom Left Log #2 in front
of back log on left arm of grate.
Rest end of bottom left log between
second and third prong of grate.
Figure 27
3. Place end of Bottom Right Log #3 on
cutout of back log #1. Rest other end
of right bottom log to the outside of
right grate prong on floor. Figure 27
4. Place right end of Top Right Log #4 on the second
and third grate prong. Figure 28
Control Knob
will be here
16 20300546
VWFOD Vented Outdoor Gas Log Set
(continued)
5. Place Bottom Left Log #5 on back log #1 and to the
outside of the left grate prong on floor. Figure 29
LG798
VWFSRO front left log
Bottom Front Left Log #5
LG798
LG799
VWFSRO top center log
Top Center Log #7
LG799
Top Left Log #6
6. Place end of Top Left Log #6 on bottom left
log. Rest the other end between the first and
second grate prongs. Figure 30
7. Place Top Center Log #7 on bottom left log
#2 and top right log #4. Figure 30
17
20300546
VWFOD Vented Outdoor Gas Log Set
LG802
VWF36 30 front logs
LG800
VWF36 30 rear log
Rear Log #1
LG800
LG801
VWF36 30 logs 2 & 3
Bottom Left Log #2
Bottom Right Log #3
LG801
Third Prong
Second Prong
Left Arm of
Grate
1. Place Back Log #1 on back of grate.
Figure 31
2. Place Bottom Left Log #2 in front of back log
on left arm of grate. Place end of bottom left
log between third and fourth prong of grate.
Figure 32
3. Place end of Bottom Right Log #3 on cutout
of back log #1. Place other end of right bottom
log to the outside of right grate prong on floor.
Figure 32
Bottom Front Left Log #5
Top Right Log #4
LG802
4. Place right end of Top Right Log #4 on the
second and third grate prongs. Figure 33
5. Place Bottom Left Log #5 on back log #1
and to the outside of the left grate prong.
Figure 33
LG803
VWF36 30 front logs
Top Center
Log #7
Top Left Log #6
Right Front Log #8
LG803
6. Place end of Top Left Log #6 on bottom
left log. Place the other end between
the first and second grate prongs.
Figure 34
7. Place Top Center Log #7 on bottom left
log #2 and top right log #4. Figure 34
8. Place Right Front Log #8 on top right log
#4 and front of burner pan. Figure 34
Control Knob
will be here
18 20300546
VWFOD Vented Outdoor Gas Log Set
LG804
VWF24SPA front logs
Right Front
Log #1b
Left Front
Log #1a
LG804
1. Place Left Front Log #1a on front left of
grate. Figure 35
2. Place Right Front Log #1b on front right
of the grate. Figure 35
LG805
VWF24SPA side support log
Side Support Log #2
LG805
3. Place front end of Side Support Log #2
on top left of Log #1a. Rest other end of
Log #2 on rear grate bar. Figure 36
LG806
VWF24SPA rear log
Rear Log #3
LG806
4. Fit cutout in the bottom left of Rear Log #3
over the back end of Log #2. Rest right end
of Log #3 on rear grate bar. Figure 37
LG807
VWF24SPA right log
Right Log #4
LG807
5. Place front end of Right Log #4 on right
top of Log #1b. The back end of Log #4
rests to right hump on Log #3. Figure
38
19
20300546
VWFOD Vented Outdoor Gas Log Set
LG810
VWS24SPA top left log
LG808
VWF24SPA left rt mid log
Left Log #6
Right Middle
Log #5
LG808
6. Place front of Right Middle Log #5 on top
right of Log #1ab. Rest back end of Log #5
on top right of Log #4. Figure 39
7. Place front of Left Log #6 just left of the
middle of Log #1a and back end of Log #6
just left of middle of Log #3. Figure 39
LG809
VWF24SPA top center log
Top Center Log #7
LG809
8. Lay Top Center Log #7 across log #3
with front end resting on Log #5. Figure
40
Top Left Log #8
LG810
9. Place front end of Top Left Log #8 on
Log #7. Let back end of Log #8 rest
on Log #6. Figure 41
20 20300546
VWFOD Vented Outdoor Gas Log Set
LG813
VWF30SPA rear log
LG811
VWF30SPA front logs
Right Front Log #1b
Left Front
Log #1a
LG811
1. Place Left Front Log #1a on front
left of grate. Figure 42
2. Place Right Front Log #1b on front
right of the grate. Figure 42
LG812
VWF30SPA side support log
Side Support
Log #2
LG812
3. Place front end of Side Support Log
#2 on top left of Log #1a. Place other
end of Log #2 on rear grate bar. Figure
43
Rear Log #3
LG813
4. Fit cutout in the bottom left of Rear
Log #3 over the back end of log #2.
Place right end of Log #3 on rear
grate bar. Figure 44
LG814
VWF30SPA left right logs
Left Log #6
LG814
Right Log #4
5. Place front end of Right Log #4 on
right top of Log #1a. The back end of
Log #4 rests to right hump on Log #3.
Figure 45
6. Place front of Left Log #6 just left of
the middle of Log #1a and back end
of Log #6 just left of middle of Log #3.
Figure 45
This manual suits for next models
1
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