Lennox Hearth 775 - Manual (Page 13)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
13
Make gas line connections. All codes require a
shut-off valve mounted in the supply line. Figure
18 illustrates two methods for connecting the
gas supply. The fl ex-line method is acceptable
in the U.S., however, Canadian requirements
vary depending on locality. Installation must
be in compliance with local codes.
Step 10. CONNECTING GAS LINE
Figure 18 - G AS CONNECTION
Gas
Valve
3/8" NPT x
Flare Fitting
3/8" Flex Tubing
3/8" Nipple
3/8" Union
3/8" Close Nipple
3/8" Shut-off Valve
1/2" x 3/8"
Reducer
Gas
Stub
1/2" x 3/8" Flare
Shut-off Valve
Gas Flex Line Connector
*Sediment Trap
3"
Min .
When fi rst lighting the appliance, it will take
a few minutes for the line to purge air from
the appliance. Once purging is complete,
the pilot and burner will light and operate as
indicated in the instruction manual. Subsequent
lightings of the appliance will not require such
purging. Inspect the pilot fl ame (remove logs,
if necessary, handling carefully).
Step 11. INSTALLING LOGS AND GLOW-
ING EMBERS
The packaged log set and bag of glowing
embers are located within the fi rebox of
the stove.
Installation Instructions:
WARNING: If logs are not installed accord-
ing to the directions shown here, fl ame
impingement and improper combustion
could occur and result in soot and/or exces-
sive production of carbon monoxide (CO),
a colorless, odorless, toxic gas.
These appliances are equipped with a gas fl ex
line for use (where permitted) in connecting
the unit to the gas line. A gas fl ex line is
provided to aid in attaching the direct vent
appliance to the gas supply. The gas fl ex line
can only be used where local codes permit.
See Figure 18 for fl ex line description. The
fl ex line is rated for both natural and propane
gas. A manual shut off valve is also provided
with the fl ex line. The gas control valve is
located in the lower control compartment.
To access the valve, open the lower access
door. The millivolt control valve has a 3/8"
(10 mm) NPT thread inlet port fi tting.
Figure 20
Ember
Strip
Rear
Log
Figure 21
Left Front Log
Figure 22
2. Place the largest log onto the rear log
stoppers (see Figure 20). Ensure that the
grooves on the bottom of the log aligns
onto the corresponding places on the rear
log stoppers. Push the log back so that it
is against the back of the rear log stoppers
(see Figure 21).
4. Place the center log piece over the cor-
responding pins next to the front left log as
shown in Figure 23.
3. Place the left front log onto the corre-
sponding burner pin and sub-fl oor left tab
as shown in Figure 22.
Rear Log Stoppers
AIR PURGING PROCEDURES MUST PER-
FORMED BY A QUALIFIED TECHNICIAN
ONLY.
Purging Air from Supply Line
a. Turn gas supply line valve off.
b. Loosen setscrew at inlet pressure tap on upper
right of control valve (see Figure 30).
c. Turn gas supply line valve on.
d. When gas fl ows, turn supply valve off.
e. Close the inlet pressure tap.
Purging Air from Appliance
Purge air from appliance by holding gas control
valve down in the pilot position until pilot will
light (see Figure 19). DO NOT LIGHT A MATCH
IF YOU SMELL GAS. Light a match then allow
gas fl ow to pilot. If the Match “blows”, there is
air in the line (purge line). If the fl ame is straight
and tall, there is no gas pressure.
Figure 19
Carefully install the ember strip and seven-
piece log set into the fi rebox as shown in
these instructions. All logs should fi t onto
corresponding pins and/or log stoppers.
This will ensure a proper fl ame and safe
combustion.
1. Carefully place the ember strip as shown
in Figure 20. Ensure that it is pushed all the
way back in position (toward the sub-fl oor
front fl ange).
Center
Log
Piece
Figure 23
Note: If an optional Brick Liner Kit was purchased,
install it now, per instructions provided in kit
*A Sediment Trap is recom-
mended to prevent moisture
and debris in gas line from
damaging the valve.