Page 3 - F10-BPS-YZ101B-Installation-Manual

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Identifying Your Unit

Model Number Designations

Model # YZ-101B-CII-L-U-¤ This hazardous location enclosure pressurization unit
is offered in various styles. For proper installation and
Div./Zone Reduction Voltage* operation, examine the Unit Model Number Nameplate
Y- Div.1/Zone1 to Div. 2/Zone 2 120 VAC to identify the Unit Style, Area Classification and Type.
Z- Div.2/Zone2 to Non-Hazardous 24 VDC
Unit Series OR YZ101-CI/CII-W-V
Pressurization Unit
101B- 3/8” Pressurization Unit Optimal Configuration*** Area Classification Reduction:
Area Classification PM- Panel Mount Type Z - Cl I/II, Div. 2/ Zone 2, Gr.
C&D, F&G to Non-hazardous
CII- Class II Areas Mounting Options Type Y - Cl I/II, Div. 1/ Zone 1, Gr.
C&D, F&G to Div. 2/ Zone 2, Gr.
Pressure Switch Option U- Universal C&D, F&G
L- Provided Less Switch Mounting** Purge Control for use in Hazardous
Locations. I n accordance w ith the
W- Provided With CI, Gr. C&D EXP Switch V- Vertical National Fire Protection Association
urged
and
Standard
for P
B- Provided With CI, Gr. B EXP Switch Mounting Pressurized Enclosures for Electrical
H- Horizontal Equipment. NFPA 496 2003.
* 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

Protective Gas Supply: Air or Inert Gas The consumption of protective gas is directly related to the
Unit Supply Pressure: w/ Purge Vent: 80 - 125 psi max. integrity of the protected enclosure plus the type of purge
w/ Redundant Regulator: 5 psi max. requirements, i.e. dilution and ventilation. The following
Unit Supply Connection: 3/8” tube fitting enclosure recommendations are provided to help minimize
protective gas consumption and increase purge unit efficiency.
Enclosure Supply: 3/8” 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: 0.5” w.c. / 55Kb
Safe Press. Flow Rate: * 0.1 - 3.5 scfh per cf 2. Non metallic enclosures should meet ANSI/UL 94 V-O
or 94 5V.
Class I Purge Time: See page 9, step 6 3. Enclosure windows should be impact resistant and sized
* Enclosure Integrity determines actual Flow Rate as small as possible.
4. Enclosure surface temperatures must not exceed 80%
Material Specifications of the area’s auto-ignition temperature.

Unit Mounting Plate: 316 Stainless Steel Brushed 5. Avoid obstructions and barriers which could impede
protective gas flow through the protected enclosure.
Regulator body: Enamel Finished Zinc
Regulator Handle: Polycarbonate Major Components List
Enclosure Press. Gauge: Enameled Aluminum
Tubing: 316 Stainless Steel Encl. Pressure Control Regulator:
Tube Fittings: 316 Stainless Steel 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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