Lennox FIRESTAR MERIT GC3, Installation And Operation Manual

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12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Table 2
Lower Front 2” Filler Panel
The FireStar™ insert comes with a 2” panel to fill the space between the
insert bottom and the hearth extension. If the hearth elevations necessitate,
the insert may be installed directly on the hearth without the leveling bolts
or filler panel. To install the panel, insert the four tabs on the top of the
panel into the corresponding slots in the insert bottom. Open the insert
side doors, remove the two socket head screws from the hardware bag
and install them (using a 5/32” hex wrench) through the insert bottom
into the filler panel. A tall adjustable filler panel is also available.
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 Firestar 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 an 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 con-
necting 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 I !
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 Table 1 for gas
pressure requirements.
Two pressure taps are provided on the insert's valve to check gas pressures.
The taps are located below the on/off/pilot knob (see
Figure 14 ). The left
tap is the inlet (supply) pressure side. To check inlet pressure (with the
insert burning), insert a small phillips screwdriver 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 to the
right of the inlet tap.
Gas Supply Line Sizing
The proper gas line diameter must be selected to run from the supply regu-
lator to the insert. Refer to the Table 2 for proper gas pipe diameters.
Note: Some areas allow copper tubing - check with local approval agen-
cies and codes.
COPPER TUBING NOT ALLOWED IN MASSACHUSETTS IN
NATURAL GAS INSTALLATIONS, NEVER USE GALVANIZED OR
PLASTIC PIPES.
Fuel
Type
Inlet Pressure Manifold Pressure
Desired Minimum Maximum On Hi
Fire
On Lo
Fire
Natural
Gas
7" WC 5" WC 10.5" WC 3.5" WC 1.7" WC
LP Gas 11" WC 10.5" WC 13" WC 10.0" WC 5.4” WC
Table 1
12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
1
/
2
"
(1.3 cm)
7
/
8
"
(2.3 cm)
3
/
4
"
(2.0 cm)
3
/
4
"
(2.0 cm)
150-200
3
/
4
"
(2.0 cm)
100-150
1
/
2
"
(1.3 cm)
7
/
8
"
(2.3 cm)
3
/
4
"
(2.0 cm)
1
/
2
"
(1.3 cm)
3
/
4
"
(2.0 cm)
1
/
2
"
(1.3 cm)
1
/
2
"
(1.3 cm)
40-100
1
/
2
"
(1.3 cm)
5
/
8
"
(1.6 cm)
1
/
2
"
(1.3 cm)
10-40
3
/
8
"
(1.0 cm)
1
/
2
"
(1.3 cm)
3
/
8
"
(1.0 cm)
1
/
2
"
(1.3 cm)
0-10
Natural Gas Natural Gas L.P. L.P.
Pipe Length
(Feet from Supply
Regulator)
(Do Not Use Copper in Massachusetts
with Natural Gas)
Tubing, Type L Outside Diam-
eter (Copper)
Schedule 40 Pipe
Inside Diameter
(Black Pipe)
1
/
2
"
(1.3 cm)
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™ 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 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
at the valve should be checked for leaks.
G
as
s
upply
l
ine
s
izinG
The proper gas line diameter must be selected to run from the
supply regulator to the stove. 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.
Figure 14
To check manifold pressure (with the insert burning at the high burn
setting) insert a small phillips screwdriver 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.
Propane tanks are at pressures that will cause damage to valve com-
ponents. Verify that the tanks have step down regulators to reduce the
pressure to safe levels.
Inlet
Pressure
Tap
Inlet Elbow
Off/On/Pilot
Manifold
Pressure Tap
Flame Height
Adjustment
Outlet
Orifice
These appliances must be isolated from the gas supply piping system
(by closing their individual manual shut-off valve) during any pressure
testing of the gas supply piping system at test pressures equal to or
less than 1/2 psig (3.5 kPa).
These appliances and their individual shut-off valves must be discon-
nected from the gas supply piping system during any pressure testing
of that system at pressures greater than 1/2 psig (3.5 kPa).