Thelin GNOME Installation And Operating Instructions Manual - page 19
GNOME
DIRECT VENT GAS HEATER
19
Vertical Installation
Vertical installation is acceptable: be aware of the
following conditions: Vertical rises can sometimes
create turbulence which will put out the pilot light.
In this event the air intake restrictor disks (see
Appendix A) will have to be adjusted to compensate
for air turbulence. Qualified service personnel can
make this adjustment..
Clearances to combustibles when passing through
ceilings, walls, roofs, enclosures, attic rafters, or
other close combustible surfaces are as follows: 1”
to pipe from any combustible surfaces.
Notes
1. If an offset is necessary in the attic to avoid
obstructions, it is mandatory to support the vent
pipe every 3 feet, to avoid excess stress on the
elbows (see Figure 5). Vertical installations that
require offsets must use 45-degree elbows. The
45-degree elbows offer less restriction to the
flow of flue gasses and intake air.
2. For multi-story vertical installations, a ceiling
firestop is required at the second floor, and any
subsequent floors.
3. Any occupied areas above the first floor,
including closets and storage spaces that the
vertical vent passes through must be closed.
The enclosure may be framed and sheet rocked
with standard construction materials. Maintain
the clearance to combustibles inside the
enclosure as per the Listing Label. Do not fill
any of the air spaces with insulation.
GENERAL VENTING MAINTENANCE
Conduct an inspection of the venting system semi-
annually. A periodic examination of venting system
should
be
done
by
a
qualified
agency.
Recommended areas to inspect are as follows:
1. Check all areas of the venting system exposed to
the elements for corrosion. Corrosion will
appear as rust spots, streaks, and in extreme
cases, holes. Any components with these
symptoms must be replaced.
2. Remove the termination cap and shine a
flashlight down the vent pipe. Remove any bird
nests or other foreign material.
3. Check for evidence of excessive condensation
such as water droplets forming on the inner liner
or dripping from the pipe vent joints.
Continuous condensation can cause corrosion of
caps, pipe, and fittings. It may be caused by
having excessive lateral runs, too many elbows,
and exterior portions of the system being
exposed to cold weather.
4. Inspect joints to ensure that no pipe sections or
fittings have been disturbed or loosened. Check
mechanical supports such as wall straps,
plumbers tape, etc., for strength, fastening, and
rigidity.
Gas Line Installation
The gas line must be installed in accordance with all
local codes. See Figure 9 for location of gas hook-
up on back of heater. The gas line must be purged
and this hook-up checked for gas leaks before
proceeding to light pilot. A gas line shut-off valve is
required no more than 3’ upstream from the heater.
Note: The gas hook-up on the back of the heater is
3/8” N.P.T. When pressure testing the gas supply at
test pressures in excess of 1/2 psig (3.5kPa) you
must isolate the heater from the supply line by
disconnecting or utilizing the gas shut off valve.