Gas Line Installation; Gas Pressure Requirements; Gas Supply Line Sizing - Lennox Hearth Products Elite Series Installation And Operation Manual

Gas Line Installation
After leveling, position the insert in the fireplace, holding it about six
inches out from its final location.
CAUTION: Specific Hearth Requirements apply (see Clearances
and Specifications).
The Designer™ gas insert must be connected to the gas line in accordance
with local codes and / or the National Fuel Gas Code, Z223.1-latest
edition, also known as NFPA 54 (In Canada, the current CAN/CSA B149.1
installation code). Included in the manual package is a 8" gas nipple.
Locate the threaded gas inlet on the lower left of the insert. Thread the
8" gas nipple into the inlet with a teflon sealer or equivalent. Attach the
gas supply line to this hard pipe. The hard pipe can receive a 3/8" inch
female iron pipe coupling, or a shut off valve. After connecting the gas
line, all joints in the line and connections at the valve should be checked
for leaks before final positioning of the unit. Conduct a gas leakage test
of the appliance piping and control system downstream of the shutoff
valve in the supply line to the appliance.
Gas Pressure Requirements
A MAJOR CAUSE OF OPERATING PROBLEMS WITH GAS
APPLIANCES IS IMPROPER GAS PRESSURE!
The most important item to check during the initial installation
and the first thing to check when operating problems occur is
gas pressure!
This appliance will not function properly unless the required
gas pressure is supplied. See the table on this page for gas
pressure requirements.
Two pressure taps are provided on the insert's valve to check gas
pressures. The taps are located to the right of the on/off/pilot knob (see
Figure 15). The bottom tap is the inlet (supply) pressure side. To check
inlet pressure (with the insert burning), insert a small phillips screw
driver into the tap and turn a half turn counter-clockwise. Cover the tap
with the line from a manometer and check the pressure. Close tap gently
but securely after completing the check. The manifold (outlet) tap is
above the inlet tap. To check manifold pressure (with the insert burning
at the high burn setting) insert a small phillips screw driver into the tap
and turn a half turn counter-clockwise. Cover the tap with the line from
the manometer and check the pressure. Again close the tap gently but
securely after completing the check. Check the taps for gas leaks with a
gas leak test solution (retighten if necessary).
If the pressure is not sufficient, make sure the gas supply line is large
enough, the supply regulator is properly adjusted and the total gas load
for the residence does not exceed the amount supplied.
The appliance and its individual shut off valve must be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/ psig.
1
The appliance must be isolated from the gas supply piping system by
closing its individual manual shut-off valve during any pressure testing
of the gas supply piping system at test pressures equal to or less than
1/ psig. Check with your gas supplier or plumber.
Fuel
Type
Natural
Gas
LP Gas

Gas Line Installation

After leveling, position the insert in the fireplace --- holding it
about six inches out from its final location.
Caution: Specific Hearth Requirements apply (see Clearances
and Specifications). The Designer™
gas line in accordance with local codes and / or the National Fuel
Z223.1-latest edition, also known as NFPA 54
Gas Code---
(In Canada, the current CAN/CSA B149.1 installation code)
Included in the manual package is a 8" gas nipple. Locate the
threaded gas inlet on the lower left of the insert. Thread the
Figure 15
8" gas nipple into the inlet with a teflon sealer or equiv. Attach
the gas supply line to this hard pipe. The hard pipe can receive
a 3/8" inch female iron pipe coupling, or a shut off valve. After
connecting the gas line, all joints in the line and connections
Gas Supply Line Sizing
at the valve should be checked for leaks.
The proper gas line diameter must be selected to run from the supply
regulator to the insert. Refer to the following table for proper gas pipe
diameters.
NOTE: Some areas allow copper tubing - check with local approval
agencies and codes.
COPPER TUBING NOT ALLOWED IN MASSACHUSETTS IN
NATURAL GAS INSTALLATIONS, NEVER USE GALVANIZED OR
PLASTIC PIPES.
Pipe Length
(Feet from Supply
Regulator)
0-10
10-40
40-100
100-150
150-200
Figure 16
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
12
Inlet Pressure
Desired Minimum Maximum
7" WC 5" WC 10.5" WC
11" WC 10.5" WC 13" WC
G
Robertshaw Millivolt Gas Valve
The proper gas line diameter must be selected to
supply regulator to the stove. Refer to the follo
proper gas pipe diameters.
must be connected to the NOTE: Some areas allow copper tubing - check with
agencies and codes.
Inlet (Supply)
COPPER TUBING NOT ALLOWED IN MASSAC
.
Pressure Tap
NATURAL GAS INSTALLATIONS, NEVER USE GA
PLASTIC PIPES.
Schedule 40 Pipe
Inside Diameter
(Black Pipe)
L.P.
Natural Gas
/ /
1 3
" "
2 8
(1.3 cm) (1.0 cm)
/
/
1 1
"
"
2 2
(1.3 cm)
(1.3 cm)
/ /
1 1
" "
2 2
(1.3 cm) (1.3 cm)
/ /
3 1
" "
4 2
(2.0 cm) (1.3 cm)
/ /
3 1
" "
4 2
(2.0 cm) (1.3 cm)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Manifold Pressure
On Hi On Lo
Fire Fire
3.5" WC 1.7" WC
10.0" WC 5.4" WC
s l s
as upply ine izinG
TH
TP
TP/TH
The Manifold
(Outlet) Tap
Tubing, Type L Outside Diam-
eter (Copper)
(Do Not Use Copper in Massachusetts
with Natural Gas)
Natural Gas L.P.
/ /
1 3
" "
2 8
(1.3 cm) (1.0 cm)
/ /
5 1
" "
8 2
(1.6 cm) (1.3 cm)
/ /
3 1
" "
4 2
(2.0 cm) (1.3 cm)
/ /
7 3
" "
8 4
(2.3 cm) (2.0 cm)
/ /
7 3
" "
8 4
(2.3 cm) (2.0 cm)