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Product Description                                             Model YZ101C

     Model YZ101C is a Type Y or Z pressurization unit designed                                Type Y & Z
     to protect electrical equipment in Class II Hazardous Areas.
     When connected to a supply of protective gas, the Model                      Pressurization Unit
     YZ101C will supply, regulate and monitor the protective gas
     supply to a protected electrical enclosure. Type Z applications
     reduce the hazardous area rating inside the enclosure from     Class II Applications
     Division 2 / Zone 2 to Unclassified. This allows general purpose
     equipment to operate in Division 2 / Zone 2 areas. Type Y      Up to 250 Cubic Feet
     applications reduce the hazardous area rating inside the
     enclosure from Division 1 / Zone 1 to Division 2 / Zone 2. This
     allows Division 2 / Zone 2 equipment to operate in Division 1   Technical Bulletin YZ101C TB-R0   © 07.23.2018
     / Zone 1 Hazardous Areas.
                Unit Operation

     Prior to Start-Up:  Ensure Protected Enclosure Power is OFF,
     Enclosure Pressure Control Regulator is closed, Protective
     Gas Supply is ON and alarm system is activated (if utilized). If
     utilized, test Purge Vent for proper operation. Start-Up: Remove
     all dust from protected enclosure. Close and seal Protected
     Enclosure. Open Enclosure Pressure Control Regulator until
     a “Safe” reading is shown on the Enclosure Pressure Gauge.
     Energize protected enclosure equipment. Loss of “Safe”
     pressure requires immediate attention. Protected enclosure
     power should be de-energized if “Safe” pressure cannot be
     restored within a reasonable amount of time.

              Unit Specifications


     Class II Maximum Enclosure Volume:   250 cubic feet
     Universal Unit Weight:               5.5 lbs.
     Vertical & Horizontal Unit Weights:   10.5 & 10.0 lbs.
     Operating Temp. Range:          -20° F - 120° F
     Protective Gas Supply:         * Air or Inert Gas
     Supply Pressure w/ RR-8 Regulator:   5 psi maximum
     Supply Pressure w/ PV-4 Vent:   80 - 125 psi maximum
     Unit Supply Connection:         1/2” tube fitting
     Enclosure Supply:               1/2” tube fitting                     Universal Mount Unit
     Enclosure Reference:            1/4” tube fitting                    less Pressure Switch for
     Safe Enclosure Pressure:            0.25” w.c.                     any side or panel mounting
     Safe Pressure Flow Rate:   ** 0.1 - 3.5 SCFH per cubic foot
     Switch Set Point on Decrease:    0.15” w.c. ± 0.02”
     Pressure Switch Conduit Port:       1/2” FPT
     Pressure Switch Contact Ratings:   See EPSK Bulletin
       *  Air must contain no more than trace amounts of flammable vapors.
       **  Enclosure integrity determines safe pressure flow rate.

       Recommended Accessories

     Redundant safety devices are necessary to protect the enclosure
     from excessive pressure of the protective gas supply in accordance
     with the requirements of NFPA 496, EN 50016 and IEC 60079-02.
     Best Purging Systems Corporation therefore strongly recommends
     a Model RR-8 Redundant Regulator installed upstream of this unit’s
     enclosure pressure control regulator.  As an alternative, a Model
     PV-4 Spark Arresting Purge Vent may be installed on the protected
     enclosure or the last enclosure of a pressurized enclosure array to
     relieve excessive pressure created by other sources.
                                                         Vertical Mount Unit
                                                       with Pressure Switch for
                                                      left or right side mounting
                                                                                           Horizontal Mount Unit
                                                                                          with Pressure Switch for
                                                                                        top or bottom side mounting








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