58
CHAPTER 4: OPERATION
087-0067 REV A
SCOTT SAFETY
Charge Station
Overview
This section covers an overview of the charge station.
We provide a full line of breathing air system components and related accessories for
the safe production and storage of compressed breathing air. Configurations of
breathing air systems will vary depending on selected options. Operators of these
units must become familiar with their particular system configuration and refer to the
proper operating instructions. These fill stations are intended only for charging
breathing air cylinders. The air compressor and purification system used with these
fill stations to fill breathing air cylinders must produce compressed air which meets
the requirements for Grade D or higher compressed air as specified in the Compressed
Gas Association publication CGA G-7.1 entitled Commodity Specification for Air,
available from the Compressed Gas Association, Inc., 1725 Jefferson Davis Hwy.,
Suite 1004, Arlington, VA 22202. In addition to meeting the requirements of Grade D
or higher, the air must be dry to a dew point of -65° F (-54° C) or less.
The fill station may be installed with storage cylinders or a manual or an automatic
cascade system. See “
” on page 74. Read and
follow all safety labels on the unit.
Caution: Follow all recommended procedures and safety precautions as provided in
this manual. Federal, State and local codes mandate safety precautions and
procedures for the handling and production of breathable air. Consult State and local
occupational health and industrial safety ordinances for additional requirements.
Proper installation of the charge stations must be performed in accordance with Scott
Safety requirements, for optimum performance and adequate warranty coverage.
Maintenance and repair of the system must be performed by a Scott trained and
certified technician.
Automatic Cascade
The principle of a cascade air storage system is to make the most efficient use of the
air stored in multiple storage cylinders to fill breathing air cylinders. This is achieved
by always drawing air first from the storage cylinder with the lowest pressure and then
switching to the storage cylinder with the next highest pressure until the breathing air
cylinder has reached the target fill pressure. The comparison is made between the
storage and cylinder pressure. If the lowest storage pressure is higher than the cylinder
pressure then you start filling from that lowest storage until the pressure equalizes
with the cylinder pressure and you continue doing so until the last storage tank
pressure is equal to the cylinder pressure. If necessary, the fourth storage cylinder is
used to finally reach the target pressure in the breathing air cylinder. When the fourth
storage cylinder drops below the target pressure, no more breathing air cylinders can
be filled to the target pressure until the storage system is refilled by the compressor.
With an Auto Cascade system, pressure sensing valves automatically select the air
supply from each of the storage cylinders. The system opens and closes the storage
cylinders to efficiently use all the available air to fill the breathing air cylinders. The
operation of the Auto Cascade system does not require additional tasks or adjustments
by the operator.
Summary of Contents for HushAir Connect 7500
Page 1: ...User Guide 087 0067 Rev A HushAir Connect 7500 COMPRESSOR SYSTEM ...
Page 2: ......
Page 3: ...HushAir Connect 7500 User Guide COMPRESSOR SYSTEM 087 0067 Rev A ...
Page 8: ...IV CONTENTS 087 0067 REV A SCOTT SAFETY ...
Page 12: ...X LIST OF TABLES 087 0067 REV A SCOTT SAFETY ...
Page 42: ...20 CHAPTER 2 INSTALLATION 087 0067 REV A SCOTT SAFETY ...
Page 73: ...Configuring the System 51 SCOTT SAFETY 087 0067 REV A Figure 27 Override Status Screen ...
Page 106: ...84 CHAPTER 5 MAINTENANCE 087 0067 REV A SCOTT SAFETY Figure 48 Oil Drain Location 3 1 2 ...
Page 112: ...90 APPENDIX A SPECIFICATIONS 087 0067 REV A SCOTT SAFETY ...
Page 119: ......
