1 B20352 ECN-12354 (0301)
Installation and Operating Instructions For
FULLY AUTOMATIC CHANGEOVER MANIFOLD
FHM2, FHM2HL, & FHM2HP SERIES
INTRODUCTION
Western manifold systems are cleaned, tested and prepared for the indicated gas service and are built
following National Fire Protection Association and Compressed Gas Association guidelines. The manifold
consists of a manifold control unit, an internal dual line assembly, and two supply bank headers, one service
and one secondary supply to provide an uninterrupted supply of gas for the specific gas application. The
manifold control unit is designed and built with features providing automatic changeover from the depleted
“Service” supply bank to the “Secondary” supply bank while maintaining a constant delivery pressure. Digital
pressure readouts, alarm, signal connections and lights show system status and alert the need to replace
depleted cylinders. Features of the automatic system include integral adjustable line regulators, power supply
with dry contacts for connecting to a remote alarm, stainless steel braided flexible pigtails with check valves,
rigid wall-mounted headers, and complete mounting hardware.
CAUTION
Failure to follow the subsequent instructions can result in personal injury or property damage:
• Never permit oil, grease, or any other combustible material to come in contact with cylinders, manifold,
and connections. Oil and grease may react and ignite while in contact with some gases-
particularly oxygen and nitrous oxide.
• Cylinder, header, and master valves should always be opened very s-l-o-w-l-y. Heat of recompression
may ignite combustible materials.
• Pigtails should never be kinked, twisted, or bent into a radius smaller than 3 inches. Mistreatment may
cause the pigtail to burst.
• Do not apply heat. Some materials may react and ignite while in contact with some gases–particularly
oxygen and nitrous oxide.
• Cylinders should always be secured with racks, chains, straps, or stands. Unrestrained cylinders may fall
over and damage, or break off the cylinder valve, which may propel the cylinder with great force.
• Oxygen manifolds and cylinders should be grounded. Static discharges and lightning may ignite materi-
als in an oxygen enriched atmosphere, creating a fire or explosion.
• Welding should not be performed near nitrous oxide piping. Excessive heat may cause the gas to
dissociate, creating an explosive force.
WARRANTY
All Western manifolds are warranted against defects in materials and workmanship for the period of one year
from date of purchase. See back cover for details of limited warranty.
LINE PRESSURE
LEFT BANK RIGHT BANK
SYSTEM NORMAL
WEST E RN I NNOVA T OR
875 B ASSE TT ROA D
WESTLAKE,OHIO44145
1-800- 783 -7 890
FHM2
FULLY A UTOMATIC HEALTH CARE G AS MANIFOLD
BANK DEPL ETED BANK DEPL ETED
READYFOR USE READYFOR USE
IN SERVI CEIN SERVI CE
