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Summary of Contents for nvent PCFF1YZ
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Page 1: Table Of Contents
Hoffman Purge/Pressurization Manual for Models PCFF1YZ PCFB1YZ This manual covers Y/Z - Purge with Continuous Flow CONTENTS: 1. Specification Sheet – CF Y/Z – Purge/Pressurization Unit 2. Application Suitability 3. Installation, Operation and Maintenance for CF Units Section 0. Description and Principle of Operation Section 1. - Page 2 1. Specification Sheet – nVent Hoffman Purge/Pressurization Units Model No. (Example): P CF B 1 YZ (Note: Not all codes are applicable) Purge Unit Type Purge/Pressurization Unit Approvals / Certifications Purging Method Europe CF = Continuous Flow EN 60079-0, EN 60079-2,...
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Page 3: Application Suitability
Y-Purge Units may be used in IECEx, ATEX Zone 1(21) - Category 2 and NEC 500 Class I, Div 1. nVent Hoffman Purge/Pressurization Units may be used for hazards of any gas group. However, apparatus associated with the nVent Hoffman Purge/Pressurization Unit, such as Non-Incendive, Intrinsically Safe signaling circuits and flameproof enclosures containing switching devices may be limited in their gas group. -
Page 4: Section 0 Description And Principle Of Operation
Installation, Operation and Maintenance Manual for nVent Hoffman Purge/Pressurization Unit Continuous Flow (CF) conforming to NFPA 496 IMPORTANT NOTE It is essential, to ensure conformity with the standard, that the user of the unit observes the following instructions. Please refer to the latest standard for detailed requirements and definitions. -
Page 5: Section 2 Operation Of The Unit
"volt-free contacts" within the PE. Exception: Power to Intrinsically Safe, or other apparatus, which is already 1.2 Quality and Installation of the Pressurizing Air or suitable for the location, need not be isolated by the nVent Inert Gas Supply Hoffman Purge/Pressurization unit. When utilizing "Y/Z"... -
Page 6: Section 3 Maintenance Of The Unit
User must close the Power Switch only after the enclosure has been pressurized Note: On nVent Hoffman CF units the Minimum Pressure and the purge sufficient to ensure that the interior of the Sensor set point may be significantly above the minimum of enclosure is gas free. - Page 7 Flow Sensor needs re-calibrating it can either be returned to If checks above reveal that the PE is correct, the fault nVent Hoffman for this service or it can be done by the user probably lies in the Control Unit. The basic operation of the...
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Page 8: Drawings
4. Drawings Quick Installation Guide – PCFB1YZ Connect isolated air supply to Control Unit With aid of supplied mounting template, cut Ensure enclosure door is closed, fully latched and mounting holes into enclosure. Ensure that free of leaks Control Unit and Relief Valve are diagonally opposed. - Page 9 PCFB1YZ Quick Installation Guide – PCFF1YZ Page 8...
- Page 10 With aid of supplied mounting template, cut mounting holes into enclosure. Ensure that Control Unit and Relief Valve are diagonally opposed. Fix Control Unit to enclosure Fix Relief Valve to enclosure For Continuous Flow units only, select orifice for required purge flow rate and fit into Spark Arrestor with circle-clip. Fix Spark Arrestor to Enclosure ensuring that Control Unit and Spark Arrestor are diagonally opposed.
- Page 11 PCFF1YZ Spark Arrestor/Orifice Page 10...
- Page 12 Relief Valve Drawing Relief Valve Position Relief Valve Cutout Schematic for both PCFB1YZ and PCFF1YZ Page 11...
- Page 13 Alarm Switch (Signals) Zone 2 /Division 2 “Alarm”: Dry, VFC, SPSTN/O Contact Hermetically Sealed Switch NI – Ex nA Non-incendive Circuits Ex m IIC T4 Gc <254 V ac rms =254 Vac rms < 1 A 0.7 A Zone 1 or 2 / Division 1 or 2 IS –...
- Page 16 Hoffman Enclosures, Inc. 2100 Hoffman Way Anoka, Minnesota 55303-1745 USA Phone: 763 422-2211 P/N 89108870 Dwg 89109562 A...
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