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Product Description                                                Model YZ103


            Model YZ103 is a Type Y or Z pressurization unit designed                    Type Y & Z Purging
            to protect electrical equipment in Class I Hazardous Areas.
            When connected to a supply of protective gas and utilized in              & Pressurization Unit
            conjunction with a Model PV-3 Spark Arresting Purge Vent, the
            Model YZ103 will supply, regulate and monitor the protective
            gas supply to a protected electrical enclosure and accomplish   Class I Applications
            purging of the protected enclosure in an expedited manner.
            Type Z applications reduce the hazardous area rating inside the   Up To 75 Cubic Feet
            enclosure from Division 2 / Zone 2 to Unclassified. This allows
            general purpose equipment to operate in Division 2 / Zone 2
            areas. Type Y applications reduce the hazardous area rating   Technical Bulletin YZ103 TB-R0   © 07.23.2018
            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 / Zone 1 Hazardous Areas.

                        Unit Operation

            Prior to Start-Up:  Ensure Protected Enclosure Power is
            OFF, Protective Gas Supply is ON, Filter Regulator is set to
            60 PSI, and alarm system is activated (if utilized). Test Purge
            Vent for proper operation. Start-Up: Close and seal Protected
            Enclosure. Open Enclosure Pressure Control Valve until a
            “Safe” reading is shown on the Enclosure Pressure Gauge.
            Open Purge Control Value and allow unit to purge protected
            enclosure for the required time marked on Unit Start Up
            Instructions or for  5 minutes, minimum and then close Purge
            Control Valve. Confirm protected enclosure “Safe” pressure
            is stable.  Energize protected enclosure equipment. Loss of
            “Safe” pressure requires immediate attention. De-energized
            power if “Safe” pressure cannot be restored within a reasonable
            amount of time.
                  Product Specifications


            Maximum Enclosure Volume:         75 cubic feet
            Universal Unit Weight:                9.5 lbs.
            Vertical & Horizontal Unit Weights:   14.0 & 14.0 lbs.
            Operating Temp. Range:          -20° F - 120° F                        Universal Mount Unit
            Protective Gas Supply:          * Air or Inert Gas                   less Pressure Switch for
            Unit Supply Pressure:      80 - 125 psi maximum                     any side or panel mounting
            Unit Supply Connection:         3/8” tube fitting
            Enclosure Supply:               3/8” tube fitting
            Enclosure Reference:            1/4” tube fitting
            Safe Enclosure Pressure:            0.25” w.c.
            Safe Pressure Flow Rate:   ** 0.1 - 3.5 SCFH per cubic foot
            Purging Enclosure Pressure:       ** 5” - 8” w.c.
            Purging Flow Rate:   10 SCFM / 600 SCFH @ 60 psi
            4 Volume Purge Time:    1 minute per 2.5 cubic foot
            5 Volume Purge Time:    1 minute per 2.0 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 and
                 purging enclosure pressure.

                    Required Accessory

            A Model PV-3 Spark Arresting Vent is required for proper operation
            of the purging cycle and to protect the enclosure from excessive   Vertical Mount Unit
            pressure of the protective gas supply in accordance with the     with Pressure Switch for
            requirements of NFPA 496, EN 50016 and IEC 60079-02.
                                                             left or right side mounting
            Best Purging Systems Corporation therefore requires the purchase of                   Horizontal Mount Unit
            a Model PV-3 Spark Arresting Purge Vent with this unit for installation              with Pressure Switch for
            on the protected enclosure or the last enclosure of an enclosure array.             top or bottom side mounting







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