Eclipse ThermAir T/A Series v1.10, Installation Guide No. 114, 4/7/06
31
ThermAir
Main Gas Shutoff
Valve Train
Gas Cock
Solenoid Valve
(normally closed)
Adjustable Limiting
Orifice
Pressure Regulator
Eclipse Combustion, Inc.
strongly endorses NFPA as a
minimum
Gas cocks are used to manually
shut off the gas supply on both
sides of the main gas shut-off
valve train.
Solenoid valves are used to
automatically shut off the gas
supply on a bypass gas system
or on small capacity burners.
Adjustable limiting orifices are
used for fine adjustment of gas
flow.
key to system
sChematiCs
These are the symbols used in the schematics.
756
710
760
684
742
Symbol Appearance Name Remarks Bulletin/
Info Guide
The ratio regulator adjusts the gas
flow in ratio with the air flow. It
contro;s the outlet pressure equal
to the impulse line pressure. The
impulse line is connected between
the top of the ratio regulator and
the blower housing.
A pressure regulator reduces
gas pressure to a stable, usable
pressure.
Ratio Regulator
Automatic Gas
Control Valve
An automatic gas control valve
adjusts gas flow to the burner
based on control system
requirements.
720
Impulse Line
--------
730