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Identifying Your system
This Enclosure Protection System is offered in various styles. For proper installation and operation, examine the System
Model Number Nameplate to identify the System Style, Area Classification, and Type, as noted below.
sERIEs
MoDEl nUMBER
Model 1001a-lps-CI type Y or Z
MAXIMUM
TOTAL
ENCLOSURE
VOLUME
Defines total
protected
PURGE CONTROL FOR USE IN HAzARDOUS LOCATIONS. IN ACCORDANCE WITH
enclosure(s) volume
THE NATIONAL FIRE PROTECTION ASSOCIATION STANDARD FOR PURGED AND
capacity for this
PRESSURIzED ENCLOSURES FOR ELECTRICAL EqUIPMENT NFPA 496- 1998 7L93
particular system.
Total enclosure(s)
APPROVED By FACTORy MUTUAL AS ASSOCIATED TyPE y & z PRESSURIzATION
CONTROL
volume must
EqUIPMENT FOR USE IN HAzARDOUS LOCATIONS. REDUCES THE INTERNAL AREA
be calculated
OF A CONNECTED ENCLOSURE IN ACCORDANCE WITH DRAWING NUMBER 1001A-IOM.
without regard for
consumed volume
ClassIFICatIon
Defines the area
classification for
which the system is
suitable for operation
To assist you through the installation and operation of your pressurization / purge system, Pepperl+Fuchs, Inc. has
provided the following information boxes throughout this manual. This information is intended to clarify certain
differences between the model styles and configurations and to warn the user / installer of potential dangers of electrical
HElpFUl HInt
RSPSupply - 1-888-532-2706 - www.RSPSupply.com
http://www.RSPSupply.com/p-6798-Hoffman-A1001YZUMC2-Purging-Pressurization-System-10-CF.aspx
sYstEM stYlE
Systems are available in three styles, with or without
an explosion proof differential pressure switch, used
to detect loss of "safe" enclosure pressure
LPS - less pressure switch
2 CUBIC FEEt MaXIMUM EnClosURE VolUME
REDUCEs IntERnal aREa ClassIFICatIon as FolloWs:
tYpE Y: Cl. I, DIV. 1, GR. a-D / ZonE 1, GR. IIC to DIV 2/ ZonE 2
tYpE Z: Cl. I, DIV. 2, GR. a-D / ZonE 1, GR. IIC to nonHaZaRDoUs
aREa
shock or enclosure over pressurization.
IMpoRtant notE
sYstEM Class RatInG
Defines Class rating for Protection
System's method of use
CI - Class I Purging system
CII - Class II Pressurization system
appRoVal
MaRKInGs &
DEFInItIons
Identifies the current
third party approvals
for this system
sYstEM tYpE
Type Z
Reduces the
internal enclosure
area Division rating
from Division 2 to
nonhazardous
Type Y
Reduces the internal
enclosure area
Division rating from
Division 1 to
Division 2
WaRnInG
3 3
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