Step 9 Connect Gas Line; Step 10 Purge Air - Lennox EVB125 Installation Instructions Manual

Factory Built Fireplace Installation Diagram
Vent Kits, HO906 (25')
& H0907 (35') includes:
1 ea. fl ex liner
1 ea. fl ashing
1 ea. collar
2 ea. hose clamps
(see table 9)
Liner Requirements:
Exhaust Vent = 4" Dia.
B-Vent or Liner listed to
UL 1777
Vertical Height Min.
= 12 ft. (3.66 M)
Vertical Height Max.
= 40 ft. (10.7 M)
Storm Collar
The fl exible vent pipe must
NOT be allowed to sag behind
insert or in fi replace fl ue.
4" diameter vent,
type B-Vent or listed
gas fuel type vent
liner (listed to UL
1777)
Remove or Secure
Damper Open
SEE FIREPLACE
REQUIREMENTS
ON PAGE 4
Under no circumstances, may separate sections of
concentric fl exible vent pipe be joined together.
Figure 18
12
Liner
Vertical
Term. Cap
Collar
Termination Cap
Flashing
Roof
Flashing
IMPORTANT
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Step 9. CONNECTING GAS LINE
Note: Final gas connection should be made after unit is in place to avoid
damage to line when pushing the unit into position.
Make gas line connections. All codes require a shut-off valve mounted in
the supply line. Figure 19 illustrates two methods for connecting the gas
supply. The fl ex-line method is acceptable in the U.S., however, Canadian
2 Hose requirements vary depending on locality. Installation must be in compliance
Clamps
with local codes.
This appliance is equipped with a gas fl ex line for use (where permit-
ted) in connecting the unit to the gas line. A gas fl ex line is provided
to aid in attaching the B-Vent appliance to the gas supply. The gas fl ex
line can only be used where local codes permit. See Figure 19 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 con-
trol 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.
G
AS CONNECTION
Gas Valve
3/8" Nipple
3/8" Union
3/8" Close Nipple
Figure 19
Step 10. PURGING AIR
AIR PURGING PROCEDURES MUST BE PERFORMED 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 control valve (see Figures 32 & 33).
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 20). 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.
When lighting the appliance for the fi rst time,
it will take a few minutes to purge air from the
gas line. Once purging is complete, the pilot
and burner will light and operate as indicated
in the instruction manual. Subsequent light-
ings of the appliance will not require such
purging. Inspect the pilot fl ame (remove logs,
if necessary, handling carefully).
Gas Flex Line Connector
3/8" NPT x
1/2" x 3/8" Flare
Flare Fitting
Shut-Off Valve
3/8" Flex Tubing
1/2" x 3/8"
Reducer
3/8" Shut-Off Valve
Figure 20
Gas
Stub