Combustion Research Omega II Installation, Operating, Maintenance And Parts Manual Download

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Omega II

Installation, Operation & Maintenance

Page 12

Combustion Research Corporation

GAS SUPPLY

WARNING

FIRE OR EXPLOSION HAZARD

IMPROPER INSTALLATION, ADJUSTMENT,
ALTERATION, SERVICE OR MAINTENANCE
CAN CAUSE DEATH, SEVERE INJURY
AND/OR PROPERTY DAMAGE.

Follow these warnings exactly.

1. Disconnect power supply before wiring to prevent

electrical shock or equipment damage.

2. To avoid dangerous accumulation of fuel gas, turn

off gas supply at the appliance service valve before
starting installation, and perform Gas Leak Test
after completion of installation.

3. Always install sediment trap in gas supply line to

prevent contamination of gas control.

Meter and service must be large enough to handle all the
burners being installed plus any other connected load.
When gas piping is not included in the layout drawing, the
local gas supplier will usually help in planning the gas
piping.



Support all gas piping with suitable suspension

materials and in accordance with local codes



Use wrought iron or wrought steel pipe and malleable

iron fittings. All pipe and fittings should be new and free
from defects. Ream the pipe ends and tubing ends to
remove obstructions and burs.



Use LP-gas resistant joint compound on all threads.

Apply only to male end of piping.

Check all piping, fittings and connections for leaks before
placing heating equipment into service. Use only soap and
water solution for checking for gas leaks, NEVER use and
open flame.

In industrial installations where the natural gas pressure at
the meter is available at higher pressure than the standard
7" TO 14" W.C., it may be possible to cut down on gas
piping costs (when local codes and the Fire Marshal
approve) by running high pressure gas lines inside the
building or on the outside of the building. In no case should
the pressure exceed 10% of the service supply pressure.
When using a high pressure gas distribution system each
heating zone should be equipped with a pounds to inches
service regulator with soft seat, positive 100% lock-up.

Allowing high gas pressure on the downstream side of the
regulator will damage the control valve in the gas train. The
outlet pressure of the service regulators should be set at 7"
W.C. for natural gas and 11" W.C. for LP gases/propane
gases. If it is not practical to regulate in "zones", each
burner may be equipped with its own regulator.

To meet the requirements of 100% positive lock-up and
internal relief vent must be piped to the outside of the
building. It is recommended that an intermediate service
regulator, such as a Maxitrol 325 Series or approved equal
be used.

The typical discharge pressure on the down stream side of
the gas meter furnished by the gas company is usually 5
P.S.I.G. while the discharge pressure of the regulator on the
propane tank is usually set at 15 P.S.I.G.

Proper sizing of low and high pressure piping distribution
systems for natural gas should be made in accordance with
the National Fuel Gas Code, ANSI Z223.1 (current
standard) NFPA No. 54. Consult the supplier of the
propane tank and vaporizing system for the sizing of the
piping system for LP gas pipe work.

When leak testing the gas piping system, the Omega II

burners must be isolated from the gas piping system. High-
pressure compressed air used in the leak test will damage
the control valve in the burner gas train, which will result in
unsafe operation of the burner(s). For proper and safe test
procedures, observe the provisions of Part #4, of the
National Fuel Gas Code, ANSI Z223.1 (current standard) -

Inspection, Testing and Purging

or refer to equivalent local.

In Canadian see gas code CAN/CGA-B149.1- M91.

NOTE: It is important that the entire system, up to the burner
gas connection, be checked for leaks, prior to start up.

GAS PIPE SIZING CHART

NATURAL GAS

LP / PROPANE GAS

Pipe
Size

Total Length of Pipe (feet)

Pipe
Size

Total Length of Pipe (feet)

20’ 40’ 60’ 80’ 100’