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GAS SUPPLY REQUIREMENTS
Correct gas pressure and proper gas supply line sizing is imperative to the successful performance of your Mendota gas
fireplace. Be sure the gas supplier or plumber carefully checks for correct gas pressure and gas line sizing when in-
stalling the fireplace.
It is critical to check for gas leaks when connecting gas line to the fireplace -- check with soap & water solution.
Gas Supply and Electrical Supply Inlets Locations
Be sure to install "approved" flex gas line with brass-to-brass fittings to prevent gas leaks at connections.
Gas supply piping must include a drip leg to eliminate the possibility of contaminants entering the gas train.
Adhere strictly to local and national codes for entire installation.
Correct gas pressure and proper gas supply line sizing is required.
GAS SUPPLY LINE SIZING
This Mendota Gas Fireplace comes equipped with a 1/2" N.P.T. Female
inlet. Gas supply piping can enter the Fireplace cabinet on the left or right
side. Location of gas supply entry hole on each side is the same and is
shown in the image on the right >.
An approved manual shut-off ball valve or keyed valve, as required by
local codes must be installed at an accessible location. The appliance
and its individual shut-off valve must be disconnected from the gas sup-
ply piping system during any pressure testing of that system at test pres-
sures in excess of ½ PSIG (3.5 kPa).
The appliance must be isolated from the gas supply piping system by
closing its manual shut-off ball 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).
A proper gas line diameter must be selected to run from the supply regu-
lator to the Fireplace. Refer to the following table for proper gas pipe di-
ameters. Strictly adhere to the correct pipe sizes.
PIPE LENGTH
(FEET)
SCHEDULE 40 PIPE
INSIDE DIA.
TUBING, TYPE L
OUTSIDE DIA.
NAT.
L.P.
NAT.
L.P.
0-10
1/2" (1.3 cm)
3/8" (1.0 cm)
1/2" (1.3 cm)
3/8" (1.0 cm)
10-40
1/2" (1.3 cm)
1/2" (1.3 cm)
5/8" (1.6 cm)
1/2" (1.3 cm)
40-100
1/2" (1.3 cm)
1/2" (1.3 cm)
3/4" (2.0 cm)
1/2" (1.3 cm)
100-150
3/4" (2.0 cm)
1/2" (1.3 cm)
7/8" (2.3 cm)
5/8" (1.6 cm)
150-200
3/4" (2.0 cm)
1/2" (1.3 cm)
7/8" (2.3 cm)
3/4" (2.0 cm)
NOTE:
Some areas allow coated stainless steel (CSST), copper tubing or galvanized pipe - check with
local approval agencies and codes. NEVER use plastic pipe.
GAS PRESSURE CHECKING REQUIREMENTS
Inlet and manifold gas pressure checking taps are located on gas valve. Perform inlet and outlet pressure tests before
completing the facing installation. Remove valve access cover box on left side of fireplace to access the gas valve and all
control components.
A qualified installer shall take pressure measurements at these ports to verify and set the correct inlet gas pressures dur-
ing initial installation. Outlet gas pressures are factory-set and cannot be field adjusted.
NOTE:
Check for gas leaks with soap and water solution on all factory joints and field installed joints during first firing of
this appliance.
GAS PRESSURE REQUIREMENTS
One of the main causes of operating problems with gas appliances can be improper gas pressure!
Problems such as changes in flame color or configuration, gas pilot or burner outages, intermittent operation, changes in
heat output, excessive burner noise, etc. are nearly always the result of changes in gas pressure or improper gas pres-
sure at the time of the installation. The most important item to check during initial installation and the first thing to check
when problems occur are the input and output gas pressures!
Gas is normally supplied to a residence at 1/2 PSI (13" - 15" W.C.) (3 KPA). A pressure regulator is then placed outside
the residence, near the gas meter, which drops this pressure to 7" W.C. (1.8 KPA) (Nat. Gas). This "inches to inches"
WARNING
: Never use any type of pipe thread sealants or compounds on the seats of flare or compression connections.
