Pepperl+Fuchs 1001A Series User manual

CLASS I APPLICATIONS
2 Cubic Feet Maximum
CLASS II APPLICATIONS
10 Cubic Feet Maximum
Face Plate w/ Universal Flange Attached
SerieS 1001A
Type y or Z
preSSuriZATion / purging KiTS
inSTAllATion & operATion MAnuAl
Universal
Flange
Accessories Supplied with Each Kit
Pentair Technical Products
2100 Hoffman Way
Anoka, Minnesota 55303
PH 763 422 2211
hoffmanonline.com
Hoffman P/N #87571946
Manufactured by:
1600 Enterprise Parkway • Twinsburg, Ohio 44087
© 2010 Pepperl+Fuchs® Inc., Twinsburg, Ohio
511821, Dwg No. 129-0200B, Printed in U.S.A
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22
Page 13 Pneumatic Tubing Requirements
Protective Gas Supply Requirements, Pneumatic
Connection Requirements
Page 14 Tubing Installation
LH, RH, TM, BM, WM, FM & PM Tubing
Configurations
Page 15 Tubing Connection Diagrams
LH, RH, TM, BM, WM, FM, & PM Configuration
Connection Points, Pneumatic Diagram
Page 16 Conduit Installation
Electrical & WPS Style Conduit and Connection
Parts
Page 17 Set-Up Procedure
Class I & Class II Set-up
Page 18 Operating Sequence
Class I & Class II Operation
Page 19 Troubleshooting Procedures
Troubleshooting Chart
Page 20 Warranty and Liability Statement
Warranty Notes, General Terms, Limitations
Page 21 System Maintenance
Regular Maintenance, Long-term Maintenance,
Maintenance Schedule
Page 22 Customer Notes
Page 24 Systems Identification & Application
Information
Important Notes
One (1) permanent file copy and one (1) operations copy of
this Manual must be studied and retained by the operator of
this System. User’s Agents are responsible for transferring
this Manual to the user, prior to start-up.
The contents of this manual have been arranged to allow the
use of this product as a stand-alone device on equipment
and enclosures supplied by the user or its agents. The
Manual’s parameters encompass a combination of both
National Fire Protection Association (NFPA) requirements
and Pepperl+Fuchs, Inc. requirements. Pepperl+Fuchs
therefore acknowledges the use of NFPA 496 as a guideline,
that we have enhanced certain NFPA requirements and that
additional information has been compiled to complete this
document. The Manual is intended as a complete guide and
must be considered, unless specifically stated otherwise,
that all directives contained herein are requirements for safe,
practical and efficient use of this product.
This System is not intended for use to protect enclosures
or devices which contain ignitable concentrations of gases
or vapors. This exclusion generally applies to process or
product analyzing systems equipment.
All specifications are subject to change without notice.
Table of Contents
Page 2 System Purpose and Description
Purpose, System Description, Important
Notes
Page 3 Identifying Your System
Defines specific features of the system
Page 4 General Information
System & Material Specifications, System Acces-
sories, Spare Parts, Tools & Test Equipment
Page 5 Enclosure and Device Design
Design Requirements, Adjacent Enclosures,
Device Ventilation, Temperature Limitations
Page 6 Installation Overview
Installation Diagram
Page 7 Getting Started
Establishing Connection Sizes, Determining
Enclosure Inlet & Outlet Connection Locations
Page 8 System Mounting
LH, RH, TM, BM & WM Configurations,
FM & PM Configurations
Page 9 Special Mounting Information
ECK, ILFK Connection Diagram, Typical Panel
Mount Diagram
Page 10 Mounting Plate Dimensions
Mounting Plate Dimension Diagrams
Page 11 Mounting Plate Dimensions (cont.)
Mounting Plate Dimension Diagrams
Page 12 Hardware Mounting
Optional Enclosure Protection Vent, Warning
Nameplates
Purpose
Pepperl+Fuchs' Bebco EPS System allows the use of general-
purpose or nonrated electrical or electronic devices, with
exception to devices which produce excessive heat, utilize
combustible gas, or expose arcing contacts to the hazardous
atmosphere, in NEMA (National Electrical Manufacturers
Association) 4 or 12 enclosures in the place of explosion
proof NEMA 7 enclosures. Other purposes include heat,
moisture and dust contamination prevention.
Description
Model 1001A is an enclosure pressurization or purging
system that operates on a supply of compressed instrument
air or inert gas. It regulates and monitors pressure within
sealed (protected) enclosures, to prevent combustible
dust accumulation or remove and prevent flammable gas
or vapor accumulations. In Class II areas, the system
maintains a “safe” (1.0") pressure. In Class I areas, the
system accomplishes four air exchanges and maintains
a “safe” (0.25") pressure. These processes reduce the
hazardous (classified) area rating within the enclosure(s), in
accordance with the NEC - NFPA 70, Article 500, NFPA 496
and ISA 12.4
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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.
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
shock or enclosure over pressurization.
MAXIMUM
TOTAL
ENCLOSURE
VOLUME
Defines total
protected
enclosure(s) volume
capacity for this
particular system.
Total enclosure(s)
volume must
be calculated
without regard for
consumed volume
SERIES
MODEL NUMBER
SYSTEM CLASS RATING
Defines Class rating for Protection
System’s method of use
CI - Class I Purging system
CII - Class II Pressurization system
Identifying Your System
HELPFUL HINT WARNING
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
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
AREA
CLASSIFICATION
Defines the area
classification for
which the system is
suitable for operation
IMPORTANT NOTE
APPROVAL
MARKINGS &
DEFINITIONS
Identifies the current
third party approvals
for this system
Model 1001A-LPS-CI Type Y or Z
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
PURGE CONTROL FOR USE IN HAZARDOUS LOCATIONS. IN ACCORDANCE WITH
THE NATIONAL FIRE PROTECTION ASSOCIATION STANDARD FOR PURGED AND
PRESSURIZED ENCLOSURES FOR ELECTRICAL EQUIPMENT NFPA 496- 1998 7L93
APPROVED BY FACTORY MUTUAL AS ASSOCIATED TYPE Y & Z PRESSURIZATION
CONTROL
EQUIPMENT FOR USE IN HAZARDOUS LOCATIONS. REDUCES THE INTERNAL AREA
OF A CONNECTED ENCLOSURE IN ACCORDANCE WITH DRAWING NUMBER 1001A-IOM.
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System Specifications
System Dimensions: See Pages 10 & 11
Shipping Weight ( lbs.): LPS - 5
Operating Temp. Range: 40° F - 120° F
Supply Pressure Range: * 5 -120 PSI max.
Supply Requirements: Clean Air or Inert Gas
Safe Press. (CI/CII): 0.25" / 1.0"
Safe Pressure Flowrate: ** 0.1-3.5 SCFH
System Supply Fitting: 1/4" Tube Fitting
Enclosure Supply Fitting: 1/4" Tube Fitting
Enclosure Reference Fitting: 1/4" Tube Fitting
* With Enclosure Protection Vent - 120 PSI maximum
Without Enclosure Protection Vent - 5 PSI maximum
In order to comply with the NFPA 496 standard requiring
protection against over pressurization of the protected en-
closure, the installer must install one of the following items
in addition to the enclosure protection system.
a) Install a Enclosure Protection Vent on the protected
enclosure.
b) Install a tamper-proof regulator upstream of the
enclosure protection system's system supply inlet to
pre-regulate protective gas supply to 5 PSI max.
In addition, for small, tightly sealed enclosures, or to com-
pensate for a fluctuating protective gas supply, it may
be necessary to pre-regulate the protective gas supply
to a constant 5 PSI regardless of whether an Enclosure
Protection Vent is installed. This will reduce the amount of
"drifting" that can normally occur when maintaining a "Safe"
pressure inside a protected enclosure. The pre-regulation
can be accomplished by installing the TR-10 or TR-10G
Tamper-Proof Regulator accessories or equivalent.
Material Specifications
Regulator Body: Zinc w/ Enamel Finish, Brass
Regulator Handle: Polycarbonate
Enclosure Pressure Gauge: ABS Plastic
Tube Fittings: 316 SS Forged Body
Tubing: 316 SS 1/4" .035 Welded
System Nameplates: Silkscreened Lexan® & SS
Fastener Hardware: Zink Plated & Stainless Steel
Mounting Plate: 316 14 Ga #3 Brush SS
EXP Pressure Switch Body: Anodized Cast Alum.
Enclosure Warning Nameplate: Silkscreened SS
Recommended Spare Parts
Qty Description Part # (supercedes)
1 Enclosure Pressure Indicator-CI 510023
1 Enclosure Pressure Indicator-CII 513235
1 Enclosure Pressure Control Regulator 513653
1 Installation & Operation Manual 129-0200
1 Enclosure Warning Nameplate-CI 513008
1 Enclosure Warning Nameplate-CII 513009
Please call and reference the above part number for
current spare parts pricing. Immediate pricing is available
to all confirmed customers.
Installation Tools & Testing Equipment
1/2" chuck drill
Complete set of drill bits
1/2" conduit knockout punch or 0.875" hole saw
Complete set of tubing, conduit bending, instrument fitting
and electrical craftsman hand tools
0 - 250 scfh flowmeter (connected upstream of the Protection
System to determine air consumption and flow during set-
up procedure)
General Information
Model 1001A System Accessories
Optional Enclosure Protection Vents
EPV-1-SA-00 Straight w/ Spark Arrestor
EPV-1-SA-90 Rt Angle w/ Spark Arrestor
Additional Items
SMK-1, -4* System Mounting Kit
ILFK-4* 1/4" In-line Filter Kit
SC-4* 1/4" x 1/4" straight Connector
EPSK-1 Class I, Group C - D Pressure Switch Kit
EPSK-1A Class I, Group A - D Pressure Switch Kit
EPSK-2 Class II, Group E - G Pressure Switch Kit
GPSK-1 Class I, General Purpose Switch Kit
GPSK-2 Class II, General Purpose Switch Kit
RAH Div. 1 Remote Alarm Horn
RAB-1 Div. 1 Remote Alarm Beacon
RAB-2 Div. 2 Remote Alarm Beacon
LCK L Fitting Conduit Kit
TCK T Fitting Conduit Kit
PIAD Purgeable Instrument Access Door
TR-10 Tamper-Proof Regulator
TR-10G* Tamper-Proof Regulator w/ Gauge
PR-10 Precision Regulator
PR-10G Precision Regulator w/ Gauge
* These items are provided as part of the Hoffman Kit.
** Accessory items are available through Pepperl+Fuchs.
Please consult the Pepperl+Fuchs Customer Service De-
partment for suitability of items for this assembly before
purchase.
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Enclosure Design Requirements
1. All windows must be shatterproof and sized as small as
possible.
2. All NFPA 496 required markings must be placed on or
near all enclosure doors and covers.
3. The enclosure must withstand an internal pressure of
ten (10) inches of water without sustaining permanent
deformation and resist all corrosive elements in the sur-
rounding atmosphere.
4. All lightweight objects in the enclosure, such as paper
or insulation, must be firmly secured.
5. The enclosure should be constructed from materials
such as metal or non-static polycarbonate to meet or
exceed NEMA 4 or 12 performance requirements, but
does not require third party approval.
6. The installation of obstructions or other barriers which
block or impede the flow of protective gas must be
avoided.
7. The creation of air pockets or other areas which trap
flammable gases within the enclosure or devices must
be avoided.
8. The enclosure should be located in an area where impact
hazards are minimal.
9. If the enclosure is nonmetallic and contains equipment
which utilizes or switches power loads greater than 2500
VA, it must be constructed from substantially noncom-
bustible materials, such as materials designed to meet
or exceed ANSI/UL94 ratings of 94 V-0 or 94 5V.
Adjacent Enclosures
1. Adjacent enclosures must be protected by one of the
following means:
a) purged or pressurized in series with the protected
enclosure;
b) purged or pressurized separately; or
c) protected by other means; e.g. explosion proof
enclosures, hermetically sealed devices or intrinsic
safe circuits.
2. Adjacent purged or pressurized enclosures must be de-
signed to meet all construction requirements above.
Enclosure & Device Design
Total Volume Calculation
1. The total volume of all pressurized enclosures, devices
and wireways must be considered.
2. All enclosure, device and wireway volumes must be
calculated without consideration of internally consumed
space.
Device Ventilation
1. Enclosed devices within the protected enclosure which
do not exceed 1.22 cubic inches of free volume do not
require ventilation to the protected enclosure.
2. If the free volume of an internal device exceeds 1.22
cubic inches it must be protected by one of the following
means:
a) ventilated on the top and bottom sides with one (1)
square inch of opening for each four hundred (400)
cubic inches of volume within the internal protected
enclosure, at a minimum diameter of one (1) quarter
inch;
b) purged in series with the protected enclosure or be
purged separately; or
c) protected by other means; e.g. explosion proof
enclosures, hermetically sealed devices or intrinsic
safe circuits.
Temperature Limitations
1. The enclosure must have no surface area which exceeds
80 percent of the flammable or ignitable substance’s
auto-ignition temperature.
2. Internal devices which exceed this temperature must be
protected by one of the following manners.
a) The device is enclosed in a chamber that is cULus
or FM listed as a hermetically sealed device which
prohibits the entrance of flammable or ignitable
substance, and maintains a surface temperature
below temperature limits.
b) It can be proven by testing that the devices will not
ignite the substance involved.
c) The device is purged in a separate enclosure that
bears an ETW (Enclosure Temperature Warning
Nameplate). Devices may only be accessed after
power has been removed and the device has been
allowed to cool to safe temperature, or the area is
positively known to be nonhazardous.
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Installation Overview
Typical Left Hand Configuration Installation Diagram
Model 1002-WPS-LH Shown
PROTECTIVE
GAS SUPPLY
SYSTEM
SUPPLY TUBING
ELECTRICAL ALARM WIRING
CONDUIT & SEAL
SERVICE
VALVE
SYSTEM SUPPLY
FITTING
ENCLOSURE
PROTECTION
SYSTEM
SYSTEM
MOUNTING
BOLT
ENCLOSURE
SUPPLY TUBING
ENCLOSURE
PROTECTION
VENT
(optional)
PROTECTED
ENCLOSURE
ENCLOSURE
CONNECTION
FITTINGS
ENCLOSURE
REFERENCE
TUBING
ENCLOSURE
WARNING
NAMEPLATE
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Getting Started
Establishing Connection Sizes, Lengths & Bends
TYPICAL SINGLE PROTECTED ENCLOSURE CONNECTIONS
PROTECTED
ENCLOSURE
C
B
ENCLOSURE PROTECTION VENT
(Optional)
E
SUPPLY
REFERENCE
1/2"
PROTECTIVE
GAS SUPPLY
HEADER
ENCLOSURE
PROTECTION
SYSTEM
Maximum Tubing / Pipe Length and
Maximum Number of Bends / Elbows
1/4" O.D. Tubing
Fully Reamed
Fully Reamed
20 Feet
10 Bends
1/4" O.D. Tubing
Fully Reamed
Description
Tubing or Pipe Diameter
Enclosure
Supply
System
Supply Tubing
Enclosure
Reference
1/4" O.D. Tubing
Fully Reamed
5 Feet
5 Bends
20 Feet
10 Bends
Multi - Enclosure
Connections
1/2" I.D. Pipe
Fully Reamed
10 Feet
5 Elbows
Optional Remote
Venting
1/2" I.D. Pipe
Fully Reamed
30 Feet
5 Elbows
ABE
D
C
INLET
ENCLOSURE
PROTECTION
SYSTEM
PROTECTED
ENCLOSURE PROTECTED
ENCLOSURE
D
SUPPLY
REFERENCE
INLET
Connections for Heavier than
Air Gases and Vapors
OUTLET
OUTLET
B
TYPICAL MULTIPLE PROTECTED ENCLOSURE CONNECTIONS
1/2"
PROTECTIVE
GAS SUPPLY
HEADER
A
A
D
C
Connections for Lighter than
Air Gases and Vapors
HELPFUL HINTS
If flammable gases are lighter than air, the inlet con-
nection to each enclosure must enter near a bot-
tom corner. The outlet connection, for an optional
enclosure protection vent or piping to an adjacent
protected enclosure, must exit near an extreme op-
posite top corner.
If flammable gases are heavier than air, inlet and outlet
connections must be reversed.
In all cases, the most prevalent gas must determine
the location of inlet and outlet connections.
Determining Enclosure Inlet & Outlet Connection Locations
HELPFUL HINTS
To ensure adequate protective gas flow to the protected enclosure(s), all piping and tubing must be fully
reamed.
Precautions must be taken to prevent crimping and other damage to protective gas piping and tubing.
PROTECTED
ENCLOSURE
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System Mounting
IMPORTANT NOTES
Mounting LH, RH, TM, BM & WM Configurations
Mounting FM & PM Configurations
HELPFUL HINTS
Systems furnished with the ECK are not compatible for
pipe mounting or multiple enclosure applications.
Determine the mounting configuration of your system
using the diagrams on pages 10 & 11.
Remove and save the manila envelope (containing the
enclosure warning nameplate) which may be taped
to the outer surface of the mounting flange.
Although all systems are factory tested and calibrated,
we strongly suggest a bench test of basic functions
prior to installation.
Surface mounting Systems without ECK accessory
1 . Transfer hole pattern of System mounting plate to
intended surface.
2. Check for obstructions hindering bolt fastening, drill and
ream the mounting holes before mounting the system.
3. Secure the system to the enclosure, or other mounting
surface, using one (1) SMK-1 mounting kit or equivalent
- four (4) 1/4" x 3/4" stainless steel bolts, nuts and lock
washers.
Pipe mounting Systems without ECK accessory
1. Locate 2" schedule 40 pipe, (vertical for LH & RH,
horizontal for TM & BM) within five (5) feet of protected
enclosure.
2. Ensure system is mounted in a true vertical position,
secure the system to pipe, using one (1) a PMK-1
mounting kit or equivalent - two (2) 1/4" x 2" stainless
steel “U” bolts, nuts and lock washers.
4. Deburr all cutout surfaces.
5. Secure system to enclosure using SMK-4 or SMK-6
mounting kit, or equivalent 1/4" x 3/4" stainless steel
nuts, bolts, mounting clips and lock washers.
The system should be mounted at EYE LEVEL.
Care must be taken to ensure the system and all
protruding components are clear of all enclosure
accesses (doors and covers) and conduit, pipe, tubing
or cable entries.
LH, RH, TM, BM and WM configurations are intended
for mounting adjacent to the protected enclosure.
LH, RH, TM & BM configurations are also suitable
for 2" schedule 40 pipe mounting. In addition, these
configurations can be accessorized with an ECK
(Enclosure Connection Kit). (See page 9)
Surface mounting Systems with ECK accessory
1. Verify dimensions of the System’s mounting holes and
connection fittings in reference to the applicable drawing
on pages 10 and 11.
2. Upon confirmation of dimensions, transfer mounting
hole pattern from drawing to the intended surface.
3. Check for internal obstructions which could hinder bolt
fastening and protective gas flow, drill and ream the
mounting holes before mounting the system.
4. Remove locknuts on enclosure connection fittings.
5. Secure the system to the protected enclosure using one
(1) SMK-1 mounting kit or equivalent - four (4) 1/4" x
3/4" stainless steel bolts, nuts and lock washers.
6. Install the locknuts on the enclosure connection fittings
from inside of the protected enclosure, ensuring that
fittings seat directly against enclosure through the
system mounting plate flange.
1. Transfer panel cutout pattern to the intended
surface.
2. Check for obstructions which could prohibit bolt
fastening or system pneumatic connections.
3. Cut panel cutout pattern on the intended surface.
FM and PM configurations are designed to mount through a panel cutout one (1) inch smaller than the overall
height and width of the system mounting plate, using clips and fasteners provided with the SMK-4 mounting
kit. This design feature eliminates the need to drill the system mounting bolt holes in the protected enclosure.
FM configurations are intended for mounting adjacent to the protected enclosure.
PM configurations are intended for mounting through a cutout in the protected enclosure surface.
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Special Mounting Information
(ECK) - FACTORY INSTALLED ENCLOSURE
CONNECTION KIT ACCESSORY
Provides factory installed tubing and
fittings for enclosure supply and reference
connections.
Typical Example of Factory Installed ECK & ILFK Accessories
Typical Examples of Surface, Pipe, Panel & Frame Mounted Systems
(ILFK) - FACTORY INSTALLED IN-
LINE FILTER KIT ACCESSORY
Provides an 8.5 oz. capacity,
40 micron protective gas supply
filter, factory installed on the inlet
side of the enclosure pressure
control regulator.
Typical Surface Mounted System
(Model 1002-LPS-CI-Z-LH shown)
Typical Pipe Mounted System
(Model 1002-LPS-CI-Z-LH shown)
Typical Panel/Frame Mounted System
(Model 1002-LPS-CI-Z-PM shown)
Model 1001A-LPS-LH shown
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1010
Mounting Plate Dimensions
Model 1001A
Face Plate
9"
8"
9" 8"
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1111
Mounting Plate Dimensions (cont.)
Model 1001A
9"
8" 8"
4"
8"
0.25"
TYP. 4
0.25"
TYP. 4
Flange Depth: 6"
3.375"
1" 1"
0.675" 0.5"
Universal Flange
Footprint
Optional Wall Flange
Footprint
(only available from Pepperl+Fuchs)
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1212
Hardware Mounting
Warning Nameplate(s)
An EWN (Enclosure Warning Nameplate) must be located
in a prominent position on or near all enclosure accesses
(doors and covers).
One (1) EWN is provided with each system, located in the
manila envelope taped to the mounting flange of the system.
Additional EWN’s are available from Pepperl+Fuchs.
All EWNs provide labeled spaces allowing the customer to
mark the protected enclosure with: 1) a T Code (temperature
identification number), 2) Class, Group and Division of
surrounding area, and 3) NFPA pressurization Type X, Y or Z,
as may be required by plant and local codes and is required
by NFPA 496.
An ETW (Enclosure Temperature Warning nameplate) must
be located in a prominent position on or near all enclosure
accesses (doors and covers) when the temperature of an
internal component exceeds 80 percent of the ignition
temperature of the flammable vapor, gas or dust involved.
The ETW warns the operator to deenergize all equipment for
a specified length of time, allowing the protected equipment
to cool before opening the protected enclosure. The length
of time required is determined by the customer and can be
factory or field engraved.
All EWNs and ETWs are furnished with an adhesive back,
but should also be riveted or screwed to the protected
Optional Enclosure Protection Vent
All configurations must be mounted in a true vertical
position.
The vent must be located to provide access for routine testing
of the vent’s flapper assembly. A minimum 8" clearance is
required below the vent opening.
1. Determine the vent’s mounting configuration, i.e.;
-00 vertical mount or -90 side mount. (see photos
below)
2. Determine vent location and layout vent mounting hole
on the protected enclosure. (as determined on page 7,
“Getting Started”)
3. Using a 0.875" hole saw or 1/2" conduit punch, drill and
deburr the enclosure protection vent mounting hole.
4. Remove the hub mounting nut from the vent hub and
place the hub, with O-ring intact, through the mounting
hole. The O-ring must be on the outside of the protected
enclosure.
Enclosure Temperature Warning Nameplate
Enclosure Warning Nameplate - Class II
Enclosure Warning Nameplate - Class I
EPV - 1 - SA - 00
Top Mount
EPV - 1 - SA - 90
Side Mount
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1313
Pneumatic Tubing Requirements
Protective Gas Supply Requirements
The protective gas supply to the protection system must
be a clean, instrument quality compressed air or nitrogen
and must contain no more than trace amounts of flammable
gas, vapor or dust.
The protective gas supply compressor intake must originate
in a nonhazardous location. Suction duct passing through
a hazardous location and the protection system tubing
and piping must be fabricated from noncombustible
materials suitable for prevailing hazards and environmental
conditions.
The protective gas supply must originate from a dedicated
instrument quality compressed air header (1/2" pipe or larger),
no farther than twenty (20) feet from the protection system.
Local compressors and gas cylinders should not be used
before consulting with Pepperl+Fuchs.
The protective gas supply to the protection system must
be equipped with a tamper-proof regulator set at 5 psi
maximum.
Exception: If the protected enclosure(s) is equipped with
a Pepperl+Fuchs Enclosure Protection Vent, the protective
gas supply to the protection system must not exceed
120 psi maximum, 5 psi minimum. (See page 4, "System
Pneumatic Connection Requirements
ALL FITTINGS MAY BE CUSTOMER OR FACTORY FURNISHED
1. For system supply, one (1) SC-4 1/4" Male Straight Con-
nector or one (1) NC-4 1/4" Male Elbow Connector or
equivalent fitting per system.
NOTE: Above fitting is required only if protection
system is furnished with an optional In Line Filter Kit
(Model ILFK) accessory. See photo on page 9
One (1) Similar fitting which will connect the inert gas
supply tubing to the inert gas supply header connection
point and one (1) lot of 1/4" O.D., .035" wall thickness,
welded or seamless stainless steel tubing.
2. For enclosure supply, one (1) EFC-4 1/4" Flush Connector,
or one (1) EBC-4 1/4" Feed-Through Connector or
equivalent fitting per system.
3. For enclosure reference, one (1) EFC-4 1/4" Flush
Connector, or one (1) EBC-4 1/4" Feed-Through
Connector or equivalent fitting per system.
4. One (1) lot of 1/4" O.D., .035" wall thickness, welded or
seamless stainless steel tubing.
NOTE: Above fittings and tubing are not required if
System is furnished with an Enclosure Connection
Kit (Model ECK) accessory. See photo on page 9
5. For multiple enclosure connections, two (2) EPC-10 1/2"
Pipe Mounting Hubs or equivalent and 1/2" 150# rated
pipe couplings & unions per interconnection.
One (1) lot 150# rating 1/2" galvanized or aluminum pipe
and fittings, fully reamed and unrestricted.
In addition to item numbers 1, 4 and 5 above, the following
fittings are required for all PM configurations.
1. For system supply on PM configurations, one (1) additional
EBC-4 or equivalent 1/4" Through Bulkhead Fitting per
system is required.
2. For atmospheric reference, one (1) PRB-4 or equivalent
1/4" female bulkhead fitting and stainless steel sintered
element is required.
PM Pneumatic Connection Requirements
SC-4 NC-4
EBC-4
EFC-4
EPC-10
PRB-4
SYSTEM SUPPLY FITTINGS
ENCLOSURE SUPPLY & REFERENCE FITTINGS
MULTIPLE ENCLOSURE CONNECTION FITTING
SYSTEM ATMOSPHERIC REFERENCE FITTING
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1414
Tubing Installation
System Supply Connections
1. Select or install a protective gas supply header tap, fitted
with the proper tube size fitting and located within twenty
(20) feet of the enclosure protection system.
2. If a service valve is placed between the protective gas
supply header and the enclosure protection system, it
must be installed in close proximity of the protected
enclosure and be labeled in accordance with section
2-11.4 of the NFPA 496, 1998 edition.
3. Select the appropriate fittings required to connect the
protective gas supply to the protection system regulator
as determined on page 13, “Pneumatic Connection
Requirements”.
4. Determine appropriate tubing route from the protective
gas supply header to the protection system regulator.
5. Bend tubing using industrial grade benders, check
tubing fit to ensure proper seating between the tubing
and fittings. Fully ream all tubing ends.
6. Install tubing and tighten all fittings to fitting manufacturer’s
specifications. Secure tubing to appropriate structural
supports as required.
Enclosure Bulkhead Fittings
1. Select the fittings required to install the System Supply,
System Supply Bulkhead Fitting and Atmospheric
Reference Bulkhead Fitting, (see page 13, “Pneumatic
Tubing Requirements”).
2. Choose location for the system supply bulkhead fitting.
This fitting allows the protective gas supply to pass
through the wall of a protected enclosure to the protection
system’s regulator supply inlet connection.
3. Choose location for the atmospheric reference bulkhead
fitting. This fitting allows the enclosure pressure gauge
to reference atmospheric pressure.
4. Drill and deburr system supply and reference bulkhead
fitting holes in the protected enclosure. Mount the
fittings.
Enclosure Supply & Reference Connections
For systems supplied with an ECK (Enclosure Connection Kit),
go to page 16 “Electrical Supply Requirements”.
1. Choose location for the enclosure supply connection(s)
based on the requirements on page 7, “Getting Started”.
2. Place the enclosure reference connection fitting directly
behind the enclosure protection system whenever
possible. For systems protecting multiple enclosures
in series, the enclosure reference connection fitting
must be placed on the last enclosure in the series.
(see page 7, “Getting Started”)
3. Drill and deburr enclosure supply and reference fitting
holes on the protected enclosure. Mount the fittings.
4. Determine appropriate route for the enclosure supply and
reference tubing.
5. Bend tubing using industrial grade benders, check tubing
fit to ensure proper seating between the tubing and fittings.
Fully ream all tubing ends.
6. Install tubing and tighten all fittings to fitting manufacturer’s
specifications. Secure tubing to appropriate structural
supports as required.
System Supply & Reference Connections
1. Select or install a protective gas supply header tap, fitted
with the proper tube size fitting and located within twenty
(20) feet of the enclosure protection system.
2. If a service valve is placed between the protective gas
supply header and the protection system, it must be in
close proximity of the protected enclosure and labeled
in accordance with section 2-11.4 of the NFPA 496.
3. Determine appropriate tubing route from the protective
gas supply header to the system supply bulkhead fitting.
4. Determine appropriate tubing route from the system supply
bulkhead fitting to the protection system regulator.
5. Determine appropriate tubing route from the atmospheric
reference bulkhead fitting to the enclosure pressure
gauge’s reference inlet connection.
6. Bend tubing using industrial grade benders, check
tubing fit to ensure proper seating between the tubing
and fittings. Fully ream all tubing ends.
7. Install tubing and tighten all fittings to fitting manufacturer’s
specifications. Secure tubing as required.
Tubing PM Configurations
HELPFUL HINTS
Tubing LH, RH, TM, BM, WM & FM Configurations
All work must be performed by technicians qualified in pneumatic tubing and electrical conduit installation.
Pepperl+Fuchs recommends the use of .035" wall thickness, welded or seamless stainless steel tubing.
If flexible tubing is used, it must be installed in a manner which will protect it from damage and corrosion.
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1515
Enclosure
Pressure
Gauge
Atmospheric
Reference
Inlet
Mounting
Plate
Tubing Connection Diagrams
LH, RH, TM, BM, WM & FM Configuration Connection Points & Pneumatic Diagram
PM Configuration Connection Points & Pneumatic Diagram
Optional Enclosure
Protection Vent
Protected Enclosure
Protected Enclosure
Optional Enclosure
Protection Vent
HELPFUL HINT
System
Supply
Inlet
Enclosure
Pressure
Control
Regulator
Enclosure
Supply
Outlet
Pneumatic connections
are bolded.
System
Supply
Venturi
Orifice
Inlet
Enclosure
Pressure Gauge
Regulator
Sintered
Vent Reference
Supply
Enclosure Reference
Bulkhead fitting
Enclosure Supply
Bulkhead fitting
System
Supply
Inlet
System Supply
Bulkhead
Atmospheric
Reference
Bulkhead
Supply
Reference
Regulator
Enclosure
Pressure Gauge
Sintered
Vent
System
Supply
Inlet
Enclosure
Pressure
Control
Regulator
Enclosure
Supply
Outlet
Enclosure
Pressure
Gauge
Enclosure
Reference
Inlet
Venturi
Orifice
Mounting
Plate
LPS Style
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1616
Electrical Supply Requirements
Explosion
Proof Device
Typical Enclosure Wiring Methods
Protected enclosures must be wired similar to explosion
proof enclosures, in accordance with Article 501-504 of the
1999 National Electric Code - NFPA 70.
Single conductor wiring must be placed in rigid metal conduit,
seal-flex conduit or other mediums approved for use in the
hazardous location surrounding the protected enclosure.
Although the 1998 edition of NFPA 496 does not require
conduit seals on pressurized enclosures in a division 2 area,
Pepperl+Fuchs strongly recommends the use of a conduit
seal as the most practical way to prevent excessive leakage
through conduit connections.
While explosion proof enclosures require conduit seals on
all cable entries, in accordance with NFPA 70, Sections
501-5, protected enclosure cable entries can be sealed in
accordance with Section 501-5 which permits the use of
compression gland fittings or other sealed cable entry fittings,
as opposed to approved conduit seals, if the wiring method
is otherwise suitable for the hazardous location.
In conclusion, there are two primary goals. First, the installer
should ensure all associated wiring and cable is protected
by pressurization or other means, such as explosion proof
conduit or intrinsic safety barriers. Secondly, the installer
must ensure all associated conduit and wireways are sealed
to conserve protective gas, unless they are used to supply
protective gas to other enclosures or devices.
Typical Enclosure Wiring Connections
Seal
Intrinsically
Safe Or Fiber
Optic Device
Adjacent
Pressurized
Device
Independently
Pressurized
Device
Intrinsically
Safe Or Fiber
Optic Device
Seal
Conduit
Conduit
Conduit
General Wiring Requirements
WARNING
THIS DEVICE CONTAINS ELECTRICAL PARTS WHICH
CAN CAUSE SHOCK OR INJURY
All electrical connections, conduit and fittings on the protected
enclosure must be suitable for the hazardous location in which
they are installed. In addition, all conduit and wire must be
installed in accordance with NEC articles 500-1, 500-2 or
500-3 as required and all relevant plant and local codes.
Note: Do not use seals on conduit used as a protected
“wireway” to supply protective gas to adjacent protected
enclosures. The same conduit can be utilized for both
electrical and pneumatic service to an adjacent protected
enclosure(s), provided the conduit is oversized to allow a
minimum free clearance equal to or larger than the pipe size
required between multiple enclosures as stated on page 7,
“Getting Started”.
Enclosure Power Requirements
The protected enclosure(s) electrical power source must
originate from a circuit breaker or fused disconnect suit-
able for the hazardous location in which it is installed. The
switch must be located within fifty (50) feet of the protected
enclosure(s) and the protection system and be properly marked.
Alarm Signal Requirements
The protected enclosure(s) alarm signal may originate from
the protected enclosure if the alarm signal is disconnected by
the protected enclosure's circuit breaker or fused disconnect
as stated in Enclosure Power Requirements above.
The protected enclosure(s) alarm signal power may also
originate from outside of the protected enclosure. In this
application, the protected enclosure may be used as a
“wireway” to pass alarm signal wiring from the power source
to the alarm device, if the wiring is isolated and properly
labeled. In addition, appropriate conduit seals must be
provided outside of the protected enclosure separately.
IMPORTANT NOTE
NFPA 496 requires the use of an alarm or an indicator to
detect the loss of safe enclosure pressure. In addition,
the NFPA 496 requires that if an indicator alone is
utilized, a protective gas supply alarm must also be
installed between the last valve in the protective gas
supply and the protected enclosure. Therefore, the
protective gas supply to all LPS Style systems must
be equipped with the above mentioned protective
gas supply alarm. Exception: Systems utilizing an
EPSK or GPSK enclosure pressure loss alarm switch
accessory will satisfy the above mentioned NFPA
requirement.
Gland
Fitting
Cable
Seal
Pressurized
Raceway
Protected Enclosure
Or Device
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1717
Set-up Procedure
CLASS I VOLUME EXCHANGE TIME CHART
MEASURED FLOW REQUIRED EXCHANGE TIME
0.10 SCFM / 6 SCFH 40 Minutes per Cubic Foot
0.25 SCFM / 15 SCFH 16 Minutes per Cubic Foot
0.50 SCFM / 30 SCFH 8 Minutes per Cubic Foot
0.75 SCFM / 45 SCFH 5.5 Minutes per Cubic Foot
1 SCFM / 60 SCFH 4 Minutes per Cubic Foot
2 SCFM / 120 SCFH 2 Minutes per Cubic Foot
3 SCFM / 180 SCFH 1.5 Minutes per Cubic Foot
4 SCFM / 240 SCFH or greater 1 Minute per Cubic Foot
NOTE: The volume exchange time chart is based on a
four (4) enclosure volume exchange. Multiply the required
exchange time above by 2.5 for applications requiring a
ten (10) volume exchange (motors).
Regardless of enclosure volume or system flow rate, it is
required that operators withhold power to the enclosure
while inducing Class I exchange, for at least five (5) minutes.
Normal exchange time calculations should be doubled if
large obstructions block inert gas flow.
The Start-Up Instruction Nameplate Exchange Time Slot
will be blank, but the unit may feature a set of direct factor
nameplates with self-adhesive backing such as “TEN
MINUTES”, for application to the start-up instructions,
dependent on how the system was specified and purchased.
Field modification of this nameplate, to show a direct factor,
is acceptable as noted above if the method used to mark the
nameplate does not deface the instructions listed. Materials
used for the marking must be indelible and withstand
prevailing environmental conditions.
NOTE: If pressure setting is difficult to stabilize or set,
(see page 20, “Troubleshooting Procedures”).
5. Install and tighten all bolts on the pressure loss alarm
switch (if utilized). Ensure the conduit is sealed with
approved compounds. Energize power to Switch and
alarm system (if utilized) and test the function of the
alarm system.
Class II Pressurization Set-up
Class I Purging Set-up
HELPFUL HINTS
The term “Safe” pressure for purposes of this manual
is defined as follows;
Class I = a minimum .25 inch of water column pressure.
Class II = a minimum 1.0 inch of water column pressure.
Regulator may be in the locked position upon arrival.
To adjust regulator, pull handle to outward position.
1. Close the Enclosure Pressure Control Regulator fully by
turning counterclockwise (CCW).
2. Temporarily connect the inert gas supply to a 0 to 250
SCFH flowmeter. Connect the outlet of the flowmeter
to the Enclosure Pressure Control Regulator.
3. Check operation of Enclosure Protection Vent (if utilized).
4. Seal enclosure(s) and adjust Enclosure Pressure Control
Regulator by opening slowly clockwise (CW) to set a
“Safe” pressure on the Enclosure Pressure Indicator.
NOTE: If pressure setting is difficult to stabilize or set,
(see page 20, “Troubleshooting Procedures”).
5. When safe enclosure pressure is stabilized, measure
flow of inert gas supply through Protection System, to
calculate required exchange time, based on the Class I
exchange time chart.
6. Install and tighten all bolts on the pressure loss alarm
switch (if utilized). Ensure the conduit is sealed with
approved compounds. Energize power to Switch and
alarm system (if utilized) and test the function of the
alarm system.
7. Cease testing and remove test equipment
(Flowmeter).
8. Connect the inert gas supply directly to the Enclosure
Pressure Control Regulator.
IMPORTANT NOTE
Operators must secure wrist or stop watch to manually
time Exchange Cycle for Class I applications.
1. Close the Enclosure Pressure Control Regulator fully,
by turning it counterclockwise (CCW).
2. Remove all traces of combustible dust from the protected
enclosure.
3. Check operation of Enclosure Protection Vent (if utilized).
4. Seal enclosure(s) and adjust Enclosure Pressure Control
Regulator by opening slowly clockwise (CW) to set a
“Safe” pressure on the Enclosure Pressure Indicator.
To test the vent’s operation, gently prod the vent flapper
open with a soft pointed object, ( example: eraser end
of a pencil) ensuring that the vent valve works freely. On
vertically configured vents, this can be accomplished
from within the protected enclosure. Side mounted
-90 configured vents can be tested by removing the
conduit plug at the bottom of the mounting tee. Multiple
operations require only one test per day if enclosure
is not opened or left unattended.
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1818
Operating Sequence
Class II Pressurization Operation
With the inert gas supply connected, enclosure power
deenergized and alarm system energized (if utilized) . .
1. Carefully read Start-Up Instruction Nameplate on
system.
2. Check operation of the Enclosure Protection Vent (EPV-1,
if utilized), opening it manually several times, (see page
17, “Helpful Hint”).
3. Remove all traces of combustible dust.
4. Seal protected enclosure(s).
5. Open Enclosure Pressure Control Regulator by turning
CW to set Enclosure Pressure Indicator at “Safe”
pressure, the Pressure Loss Alarm Switch should then
activate to silence the alarm system (if utilized).
6. Ensure the Protection System Enclosure Pressure
Indicator maintains a “Safe” pressure for one (1)
minute.
7. Energize the protected enclosure power.
8. Ensure the Enclosure Pressure Indicator maintains a “Safe”
pressure before leaving system unattended.
Model 1001A-LPS
Front View
Class I Purging Operation
With the inert gas supply connected, enclosure power
deenergized and alarm system energized (if utilized).
1. Carefully read Start-Up Instruction Nameplate on
system.
2. Check operation of the Enclosure Protection Vent (EPV-1,
if utilized), opening it manually several times, (see page
17, “Helpful Hint”).
3. Seal protected enclosure(s).
4. Open Enclosure Pressure Control Regulator, by turning
CW, to set Enclosure Pressure Indicator at “Safe”
pressure, the Pressure Loss Alarm Switch should then
activate to silence the alarm system (if utilized).
5. Ensure the Protection System Enclosure Pressure
Indicator maintains a “Safe” pressure for one (1)
minute.
6. Standby for the exchange time as specified on the
Instruction Nameplate, then energize the protected
enclosure power.
7. Ensure the Enclosure Pressure Indicator maintains a “Safe”
pressure before leaving system unattended.
Enclosure
Pressure
Control
Regulator
Start - Up
Instruction
Nameplate
Enclosure
Pressure
Gauge
Model Iden-
tification
Nameplate
WARNING
Do not exceed a “Safe” pressure with the Enclosure Pressure Control Regulator.
Operators must follow step-by-step sequence of the Start-Up Instructions Nameplate on the Protection System.
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1919
Problem or Fault
Enclosure pressure control regulator
will not hold a safe pressure.
Enclosure pressure indicator reading
is difficult to stabilize.
Enclosure Pressure Indicator "Drifts"
up or down from the "Safe" pressure
setting.
Enclosure pressure loss alarm switch
does not appear to be operating
(if utilized).
Problems persists, or if the system
does not appear to be operating
properly.
Troubleshooting Procedures
Possible Causes
Leakage around gasketing, covers,
seams, piping and tubing connections,
conduit connections and electrical
conduit seals of the enclosure.
Insufficient enclosure leakage or
opening of the venturi orifice is crimped
too small.
Application involves a small, tightly
sealed enclosure and/or a fluctuating
protective gas supply.
Pressure switch is out of calibration.
Corrective Action
Tighten enclosure latches. Where
tightening is not feasible, and
gasketing materials are not practical,
holes or gaps can be closed with
silicone sealant applied from inside
the protected enclosure.
Remove the orifice, cut off the
crimped end and ream the tube, then
recrimp and reinstall the tube to note
effect. As tube is shortened, reamed,
and recrimped, sensitivity decreases,
allowing easier adjustment of setpoint
on the enclosure.
Pre-regulate the protective gas supply
upstream of the enclosure protection
system to 5 psi maximum.
For dramatic fluctuations in the
protective gas supply, it may be
neccessary to utilize a self-relieving
low flow precision regulator to pre-
regulate the protective gas supply.
Calibrate by slowly adjusting
counterclockwise to decrease the
setpoint, and clockwise to raise the
setpoint. (Do not attempt to calibrate
the switch until all efforts to make the
switch respond properly have failed)
Persisting problems
Contact Pentair Technical Products at
[phone] for more information.
This section covers the most common problems documented with these systems. Any problems not covered in this
section should be addressed directly to our factory. Please address all service needs to Pentair Technical Products
[phone].
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2020
Warranty Terms and Conditions
PEPPERL+FUCHS STANDARD 24-MONTH WARRANTY
1. Limited Warranty. Pepperl + Fuchs, Inc. (“P+F”) warrants Purge Units and components for Purge Units manufactured
by P+F (“Product” or “Products”) to be free from defects in material and workmanship under Normal Use for a period of
twenty-four (24) months from the date of shipment of such Products from P+F’s warehouse or place of manufacture (or
from P+F’s authorized representative or distributor). Only the original purchaser of such Products (the “Customer”) shall be
entitled to the benefit of the foregoing Limited Warranty. No representative, agent or salesman of P+F is authorized to give
or provide any warranty or make any representation contrary to or in addition to the foregoing Limited Warranty.
2. Inspection and Claims. Customer must inspect and test all Products upon receipt. All claims under the Limited Warranty
provided herein must be made within thirty (30) days of the discovery of the defect. Customer must obtain shipping
instructions from P+F prior to returning any Product, which Product must be returned at Customer’s expense in
accordance with P+F’s instructions.
3. Limitations and Exclusions. “Normal Use” shall mean use and operation within rated capacities, at the correct voltage,
and with any required maintenance as provided in the applicable P+F Operating Manuals. The Limited Warranty provided
herein does not apply to (i) any Products which have been altered or modified in any way or disassembled by the
Customer or anyone else, (ii) any Products which have been subject to misuse, negligence or accident, or improperly
installed, changed, substituted or replaced, (iii) any part or component not manufactured by P+F, or (iv) any part or
component that is subject to wear or consumption. For parts or components not manufactured by P+F, the Customer
or any other user or owner shall have only the warranty provided by the manufacturer of such part or component. The
Limited Warranty set forth herein is also subject to the following:
(1) The Limited Warranty is limited to electronic and mechanical performance only, as expressly detailed in
the product specifications, and does not apply to cosmetic appearance;
(2) The Limited Warranty shall not apply to any cables attached to, or integrated with, any Products.
(3) The Limited Warranty shall not apply to any Products which are stored, or utilized, in harsh environmental
or electrical conditions outside P+F’s written specifications.
THE LIMITED WARRANTY SET FORTH HEREIN IS THE ONLY WARRANTY MADE BY P+F WITH RESPECT TO THE
PRODUCTS. IT IS EXPRESSLY AGREED AND UNDERSTOOD THAT P+F MAKES NO WARRANTY OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. EXCEPT FOR THE LIMITED WARRANTY SET FORTH HEREIN, THERE IS
NO OTHER WARRANTY, EXPRESS, IMPLIED OR STATUTORY; AND THERE IS NO AFFIRMATION OF FACT OR PROMISE
BY P+F WITH REFERENCE TO THE PRODUCTS. IN NO EVENT SHALL P+F BE LIABLE FOR ACTUAL OR ANTICIPATED
LOST PROFITS OR FOR INCIDENTAL OR CONSEQUENTIAL OR PUNITIVE DAMAGES OR FOR DAMAGES RESULTING
FROM BUSINESS INTERRUPTION, OR INJURY OR DEATH OF PERSONS, OR INJURY TO PROPERTY. P+F’S
LIABILITY ON ANY CLAIM OF ANY KIND ARISING OUT OF, CONNECTED WITH OR RESULTING FROM THE DESIGN,
MANUFACTURE, SALE, REPAIR OR OPERATION OF A PRODUCT, SHALL NOT EXCEED THE PRICE ALLOCABLE TO
THAT PRODUCT OR THE PART THEREOF WHICH GIVES RISE TO THE CLAIM. THE REMEDY SET FORTH IN THIS
LIMITED WARRANTY CONSTITUTES THE SOLE AND EXCLUSIVE REMEDY OF THE CUSTOMER. P+F SHALL NOT BE
LIABLE FOR PENALTIES OF ANY DESCRIPTION.
4. Limitation of Remedies. In the event of P+F’s liability, whether on this Limited Warranty or based on contract, tort
(including, but not limited to, negligence and strict liability) or otherwise, Customer’s sole and exclusive remedy will be
limited to, at P+F’s option, the repair or replacement (f/o/b P+F’s place of manufacture) by P+F of any non-conforming
items for which claim is made by Customer in accordance with paragraph 2, or the repayment of the portion of the
purchase price paid by Customer attributable to the non-conforming item.
5. Responsibility of Customer: Safety and Protection Precautions. P+F takes great care to design and build reliable and
dependable Products; however, some Products can fail eventually. Customer must take precautions to design its
equipment to prevent property damage and personal injury in the unlikely event of a failure. AS A MATTER OF POLICY,
P+F DOES NOT RECOMMEND THE INSTALLATION OF PRODUCTS AS THE SOLE DEVICE FOR THE PROTECTION
OF PERSONNEL OR PROPERTY AND, THEREFORE, THE CUSTOMER SHOULD BUILD IN REDUNDANCY OR DUAL
CONTROL USING APPROVED SAFETY DEVICES FOR THESE APPLICATIONS.
6. Conflicts. In the event there is any conflict between the provisions of this Limited Warranty and any provisions contained
in any orders, offers, acceptances or other writings or statements provided or made by Customer to P+F, the provisions
of this Limited Warranty shall prevail, and the contract between P+F and the Customer shall be deemed formed only upon
the provisions set forth in this Limited Warranty, and any additional or conflicting provision inserted by Customer shall be
of no force or effect.
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