GAS SUPPLY
Check all local codes for requirements, especially for the size and type of gas supply line required.
Recommended Gas Pipe Diameter
Pipe Length | Schedule 40 Pipe | Tubing, Type L | ||
| Inside Diameter | Outside Diameter | ||
| Nat. | L.P. | Nat. | L.P. |
1/2” | 3/8” | 1/2” | 3/8” | |
12.7mm | 9.5mm | 12.7mm | 9.5mm | |
1/2” | 1/2” | 5/8” | 1/2” | |
12.7mm | 12.7mm | 15.9mm | 12.7mm | |
1/2” | 1/2” | 3/4” | 1/2” | |
12.7mm | 12.7mm | 19mm | 12.7mm | |
3/4” | 1/2” | 7/8” | 3/4” | |
19mm | 12.7mm | 22.2mm | 19mm | |
Note: Never use plastic pipe. Check to confirm whether your local codes allow copper tubing or galvanized.
Note: Since some municipalities have additional local codes, it is always best to consult your local authority and installation code.
Installing a New Main Gas Cock
Each appliance should have its own manual gas cock.
A manual main gas cock should be located in the vicinity of the unit. Where none exists, or where its size or location is not adequate, contact your local authorized installer for installation or relocation.
Compounds used on threaded joints of gas piping shall be resistant to the action of liquefied petroleum gases. The gas lines must be checked for leaks by the installer. This should be done with a soap solution watching for bubbles on all exposed connections, and if unexposed, a pressure test should be made.
Never use an exposed flame to check for leaks. Appliance must be disconnected from piping at inlet of control valve and pipe capped or plugged for pressure test. Never pressure test with appliance connected; control valve will sustain damage!
A gas valve and ground joint union should be installed in the gas line upstream of the gas control to aid in servicing. It is required by the National Fuel Gas Code that a drip line be installed near the gas inlet. This should consist of a vertical length of pipe tee connected into the gas line that is capped on the bottom in which condensation and foreign particles may collect.
The use of the following gas connectors is recommended:
—ANS Z21.24ApplianceConnectors ofCorrugatedMetalTubing and Fittings
—ANS Z21.45 Assembled Flexible Appliance Connectors of Other Than
The above connectors may be used if acceptable by the authority having jurisdictionThe state of Massachusetts requires that a flexible appliance connector cannot exceed three feet in length.
Figure 3
Checking Manifold Pressure
NATURAL GAS MODELS (N) will have a manifold pressure of approximately 3.5" w.c. (.871kPa) for maximum input or 1.7" w.c. (.423kPa) for minimum input at the pressure regulator outlet with the inlet pressure to the pressure regulator from a minimum of 4.5" w.c. (1.120kPa) for the purpose of input adjustment to a maximum of 10.5" w.c. (2.614kPa).
PROPANE GAS MODELS (P) will have a manifold pressure approximately 10.0"w.c. (2.49kPa) at the pressure regulator outlet with the inlet pressure to the pressure regulator from a minimum of 11.0"w.c. (2.739kPa) for the purpose of input adjustment to a maximum of 13.0"w.c. (3.237kPa).
A test gage connection is located downstream of the gas appliance pressure regulator for measuring gas pressure. The connection is a 1/8 inch (3mm) N.P.T. plugged tapping.
MILLIVOLT CONTROL
The valve regulator controls the burner pressure which should be checked at the pressure test point. Turn captured screw counter clockwise 2 or 3 turns and then place tubing to pressure gauge over test point (Use test point “A” closest to control knob). After taking pressure reading, be sure and turn captured screw clockwise firmly to
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