Page 3 - F14-BPS-YZ104-Installation-Manual

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Identifying Your Unit

Model Number Designations

Model # YZ-104-CI-L-U-¤ This enclosure pressurization unit is offered in various
styles. For proper installation and operation, examine
Div./Zone Reduction Voltage* the Unit Model Number Nameplate to identify the Unit
Y- Div.1/Zone1 to Div. 2/Zone 2 120 VAC Style, Area Classification and Type, as noted below.
Z- Div.2/Zone2 to Non-Hazardous 24 VDC
Unit Series OR YZ103-CI-W-V
Purge Unit
104- Purge Unit Optimal Configuration*** Area Classification Reduction:
Area Classification PM- Panel Mount Type Z - Cl I, Div. 2/ Zone 2, Gr.
C&D, to Non-hazardous
CI- Class I Areas Mounting Options Type Y - Cl I, Div. 1/ Zone 1, Gr.
C&D to Div. 2/ Zone 2, Gr. C&D
Pressure Switch Option U- Universal Purge Control for use in Hazardous
L- Provided Less Switch Mounting** Locations. In accordance w ith the
National Fire Protection Association
W- Provided With CI, Gr. C&D EXP Switch V- Vertical Standard for Purged and
Pressurized Enclosures for Electrical
B- Provided With CI, Gr. B EXP Switch Mounting Equipment. NFPA 496 2003.
H- Horizontal
* For pressure switch option “B” only Mounting 23HP
** Not Available with pressure switch options
*** Panel Mount designed to mount through the wall of protected enclosure. U mounting only.
General Information

Unit Specifications Protected Enclosure Criteria
Purge Time: 4 Volumes @ 1 minute per 7.5 cf The consumption of protective gas is directly related to the
5 Volumes @ 1 minute per 6.0 cf integrity of the protected enclosure plus the type of purge
Protective Gas Supply: Air or Inert Gas requirements, i.e. dilution and ventilation. The following
Gas Supply Pressure: 80 - 125 psi max. enclosure recommendations are provided to help minimize
Unit Supply Connection: 1/2” tube fitting protective gas consumption and increase purge unit efficiency.
Enclosure Supply: 1/2” tube fitting 1. The enclosure should be fabricated to meet NEMA 4 or
Enclosure Reference: 1/4” tube fitting 12 / IP66 requirements.
Safe Enclosure Pressure: 0.25” w.c. / 6.22 Kb 2. Non metallic enclosures should meet ANSI/UL 94 V-O
Safe Press. Flow Rate: * 0.1 - 3.5 scfh per cf or 94 5V.
Purge Enclosure Pressure: * 5” - 8” w.c.
Purge Press. Flow Rate: 30 scfm @ 60 psi. 3. Enclosure windows should be impact resistant and sized
as small as possible.
* Enclosure Integrity determines actual Pressure & Flow
4. Enclosure surface temperatures must not exceed 80%
Material Specifications of the area’s auto-ignition temperature.
5. Avoid obstructions and barriers which could impede
Unit Mounting Plate: 316 Stainless Steel Brushed protective gas flow through the protected enclosure.
Regulator body: Enamel Finished Zinc
Filter & Handle: Polycarbonate Major Components List
Enclosure Press. Gauge: Enameled Aluminum
Injection Press. Gauge: Polycarbonate/Brass Filter Regulator:
Tubing: 316 Stainless Steel Enclosure Pressure Valve:
Tube Fittings: 316 Stainless Steel Purge Valve:
Valves: 316 Stainless Steel Purge Press. Indicator:
Valve Handles: Polycarbonate Enclosure Press. Indicator:
Start up Labels: Silkscreened Lexan Optional Pressure Loss Alarm:
Enclosure Warning Label: Stainless Steel Enclosure Warning Label: EWL-1

WARNING
All electrical connections of the protected enclosure and purge unit must be performed by trained and knowledgeable
personnel. In addition, all connections must be installed in accordance with the National Electrical Code (NEC) NFPA
70 and all relevant international, nation and local codes. The Authority Having Jurisdiction must approve all electrical
installations. Failure to follow electrical warnings can cause harm, death or dismemberment to personnel and can cause
damage to instrumentation.

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