BULKY DOCUMENTS
`
`(Exceeds 100 pages)
`
`Proceeding/Serial No:
`
`77612049
`
`Filed:
`
`8[24[2010
`
`Title: REQUEST FOR RECONSIDERATION AFFER
`FINAL ACTION.
`
`Part
`
`2
`
`of
`
`2
`
`

`
`
`A CAUTION: Do not dent or
`defonn the sensitive bulb of
`this control. Denting or
`deforming will change the
`calibration and cause the
`control to cycte at a
`temperature tower than the
`
`
`
`
`
`--.--r.-"2".'"7'A-
`
`
`
`'?,'7_F'“,""F""M""
`
`Fig. 2 — Beaded chain with
`sleeves installed. The “snap”
`plugs are used to hold the chain
`in the thermostat.
`
`
`
`Fig. 3 — Back view of thermostat
`illustrating method of installing
`chain.
`
`4. Be sure the thermostat is
`installed in a location where
`direct air from doors,
`windows and other cold air
`sources; or heat from heater
`discharge, lights and other
`heat sources will not unduly
`affect the thermostat
`operation.
`
`5.
`
`Plug the heater cord into the
`thermostat extension cord.
`The heater cord should be
`3-wire type with 3-prong
`plug for 120 Volt service
`and the ‘Green’ wire should
`be connected to heater
`enclosure. For longer runs
`use only 3—wire extension
`cords which have 3~prong
`grounding type plugs and
`adequate wire size.
`
`NSON
`CONTR 8
`
`Electrical Ratings
`Volg AC
`120
`.
`Ill Load Arrps.
`15
`
`Loc 90 or Amps.
`
`‘l800W8t‘ls
`VZOVAC
`———125Pi 2 120 A V
`
`
`
`
`
`Checkout Procedure
`
`Before leaving the installation,
`observe at least three complete
`operating cycles to be sure that
`all components are functioning
`correctly.
`
`Repairs and Replacement
`
`Field repairs must not be made.
`For a replacement thermostat,
`Contact the nearest Johnson
`Controls wholesaler.
`
`POVLI SWPLY
`I20 VQC
`
`V 1250
`AIIBAG-1 PLUG
`SIFPUCD ‘RKTN CON"lR
`
`
`
`
`Fig. 4 -— Schematic wiring hookup of Product Number
`A19BAG-1 with portable construction heater.
`
`1%
`
`X1.1£2
`
`TT
`
`3a
`
`t
`
`
`
`Perfonnance specifications appearing herein are nominal and are subject to
`accepted manufacturing tolerances and application variables.
`
`Dimenslons
`
`Jn.
`
`Controls Group
`507 E. Michigan Street
`PO. Box 423
`Milwalkee, VVI 53202
`
`2 A19BAG Product Bulletin
`
`Printed in USA
`
`

`
`NSON
`CONTR S
`
`FANS 121. 125
`Temperature Controls Section
`Product Bulletin
`issue Date
`
`A
`A19AUC, A1 QBUC
`1091
`
`Types A1 9AUC, A19BUC Fixed Differential
`Thermostat For Hazardous Location
`
`
`
`Features
`
`- Dependable and precise
`snap-acting contacts
`enclosed in a dust protected
`case and the liquid filled
`sensing element are field
`proven.
`
`- Unaffected by barometric
`pressure and cross ambient
`temperature problems for
`‘repeat’ accuracy.
`- SPDT contacts for use on
`either heating or cooling
`applications.
`
`- UL Listed, CSA Certified for
`“Hazardous Locations.‘
`
`with air bulb.
`
`General Description
`
`The temperature sensing
`elements are liquid filled,
`providing uniform differential
`throughout the selected
`adjustment range. Remote bulb
`elements are regularly supplied
`with a 6 foot. (1.8 rn) capillary.
`Requests for other construction
`variations should be sent to
`Customer Sewice.
`
`The range adjustment changes
`the cut-in and cutout points
`alike. The differential is
`nonadjustable.
`
`
`
`Fig. 2 — lnteriorview ofthe
`A1 SAUC with clamp on bulb.
`
`Application
`The A1 QAUC and A19BUC
`thermostats are designed for
`use in locations where
`flammable and explosive
`mixtures of vapors and gases
`with air or combustible dust in air
`are present. Listed at UL for
`‘Hazardous Locations. Class I.
`Group D (NEMA 7) and Class H,
`Groups E. F and G (NEMA 9)’
`as defined in the National
`Electrical Code. The SPDT
`contact unit provides open high
`or close high action for either
`heating or cooling applications.
`The thermostats are available to
`cover sensed temperatures from
`-30 to 475°F (-34 to 246°C).
`Closed tank fittings and bulb
`wells are available for immersion
`applications.
`
`All Series A19 thermostats are
`designed for use only as
`operating controls. Where an
`operating control failure
`would result in personal injury
`andlor loss of property, it is
`the responsibility of the
`installer to add devices
`(safety, limit controls) or
`systems (alann, supervisory
`systems) that protect against,
`or warn of, controi failure.
`
`Specifications
`
`SPOT Contact Acfion. Remote Sensing Elernent
`NISAUE
`A19BUC SPDTContact Action. Coiled Bulb
`
`T”. Numb”
`.
`Differential and
`See Selecfion and Range Table
`Ilaxlmum Ternpenture
`euro
` i;“—*:j‘
`switch
`Snap-Acting Contacts in Dust Protected
`
`Ca
`At9AUC . 6ft(1.8m)Standard Lc
`Finish
`.
`Natual Alurinum
` ?m*****—~
`
`Wiring Connections
`Screw Type Ternirials.
`
`
`4. Flour, starch or grain dusts.
`1
`91991.lohnsonControls.lnc
`CodeNo. UT-121035
`Pat! No. 3544, Rev. I
`
`These thermostats are suitable
`for installation in hazardous
`locations as defined in the
`National Electrical Code, where
`the atmosphere may contain the
`following:
`
`1. Certain vapors and gases.
`
`2. Dust such as atuminum,
`magnesium or their
`commercial alloys.
`
`3. Carbon black. coat or coke
`dusts.
`
`
`
`
`
`i
`
`

`
`with NEMA Type 4X Raintight Enclosures
`
`A28PA and A28PJ Type Two-Stage Temperature Controls
`
`installation instructions
`issue Date
`
`August 24. 2005
`
`Application
`
`
`IMPORTANT:
`The A28PA and A28PJ Type
`Temperature Controls are intended to control
`
`
`equipment under normai operating conditions.
`Where failure or malfunction of an A28PA or A28PJ
`temperature control could lead to an abnormat
`operating condition that could cause personal injury
`or damage to the equipment or other property. other
`devices (limit or safety controls) or systems (alarm or
`supervisory) intended to warn of or protect against
`failure or malfunction of the A28PA or A28PJ
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Operation
`The circuit between R and Y of the low stage switch
`(RYL) closes, and R and B (RBL) opens on
`temperature increase to the setpoint (dial setting). On
`a further temperature increase. the high stage switch
`ctoses RY” and opens RB... The reverse sequence
`occurs on a temperature decrease.
`
`lnstallation
`
`Dimensions
`
`temperature control must be incorporated into and
`maintained as part of the control system.
`
`
`
`
`
`The A28PA and A28PJ type two-stage
`etectromechanical temperature controls are designed
`for use in many agricultural applications. The A28PA
`and A28PJ controls have rugged Noryl plastic
`enclosures and are UL Listed as NEMA Type 4X.
`A28PA and A28PJ controls are also UL Listed for use
`
`in National Electrical Code (NEG) Article 547
`Agricultural Environments (ANSIINFPA 70).
`
`Two Single~Poie. Double-Throw (SPDT) switches
`allow independent stage control circuits. Each switch
`may be wired for open-high or close-high action,
`providing automatic changeover on heating/cooling
`applications. A jumper across the switches’ common
`(red) terminais is supplied as a standard feature.
`
`The adjustable A28PA and A28PJ type temperature
`controls have O-ring sealed external setpoint
`adjustment knobs and range scales with oversized
`markings for easy readability in low light
`
`Do not dent, bend, uncoil, or
`IMPORTANT:
`otherwise alter the position of the sensing element
`(coil) mounted on the base of the A28PA and A28PJ
`type controls. Damaging the sensing element (coil)
`may change the control calibration and voids any
`warranties on the control.
`
`
`
`© 2005 Johnson Controls, inc.
`Part NO. 996-545. Rev. D
`
`Figure 1: Dimensions for A28PA and A28PJ Type
`Temperature Controls with NEMA Type 4X
`Enclosures, inJmm
`
`Mounting
`Mount the temperature control where it is exposed to
`the average temperature of the controlled space. Do
`not mount it where it can be affected by unusual heat
`' or cold, such as over an animal stall or in direct
`sunlight. Avoid locations near doors. windows, or other
`sources of non—ambient air drafts. Do not mount the
`control on an outside wall or where temperature at the
`sensing element exceeds 140°F {60°C).
`
`1
`www.johnsoncontrcls.com
`
`

`
`Mount the temperature control to a flat surface with
`screws through the holes in the mounting ears on the
`back of the case. See Error! Reference source not
`found..
`
`Note: For watertight connection to rigid conduit,
`connect an approved watertight conduit fitting to
`the conduit first, and then connect the fitting to the
`A28PA or A28PJ control enclosure.
`
`lnsert wire through conduit opening.
`3.
`4. Make wiring connections to the screw terminals.
`See Figure 2. Figure 3, and Figure 4.
`
`5. Ensure that the O-ring is seated properly. Replace
`the cover and knob assembly. Be sure to check
`the alignment of the range adgustment knob.
`
`
` LOW Temll High Temp.
`
` Low and High Temperature
`
`Stage
`
`Stage
`
`
`
`Stage Switch-Action is:
`
`
`
`wiring
`
`
`A WARNING: Risk of Electric Shock.
`
`
`
`
`
`
`Disconnect each of multiple power supplies before
`making electrical connections. More than one
`disconnect may be required to completely
`de~e-nergize equipment Contact with components
`carrying hazardous voltage can cause electric shock
`and may resuit in severe personal injury or death.
`
`
`
`
`
`
`
`
`
`All wiring must conform to all
`IMPORTANT:
`local, national, and regional regulations. Use copper
`conductors only for ail wire connections.
`
`
` IMPORTANT:
`Do not use A28 temperature
`controls on applications where the electrical load
`
`across the control's switch may exceed the electrical
`
`ratings shown on the temperature controls label.
`
`
`
`Use only the terminal screws
`IMPORTANT:
`fumished with the switch. Using other screws in the
`switch voids the warranty, may damage the switch,
`and may cause problems in making secure
`
`connections.
`
`Vlfiring terminals of each switch are coior coded to
`simplify wiring. Red (R) is the common terminal. The
`red to yellow (Y) circuit closes on temperature
`increase and is typicalty used to control cooling or
`ventilating equipment. The red to blue (8) circuit opens
`on temperature increase and is typically used to
`control heating equipment.
`
`To make wiring connections, proceed as follows:
`
`1. Loosen the four cover screws and remove the
`cover and knob assembly. The knob is secured in
`the cover and must not be removed. Do not
`damage the O-ring.
`2. Select the knockout to be removed. Place a
`screwdriver blade on the knockout near the edge.
`Apply a sharp blow to the screwdnver handle to
`'°°se" the k”°°k°”t'
`
`Figure 2: A28 Temperature Control Switch Action
`
`L1
`
`A28 T
`emperature
`
`Com?’
`
`Connect l°Y
`,3
`for cooiin9-
`es,
`Connect to 8
`-o
`.
`m heatm g
`
`I
`Figure 3. Typical A28 comm, wiring for
`Two-Stage Control Circuit
`
`
`
`2 A28PA and A28PJ Type Twc—Stage Temperature Controls with NEMA Type 4X Raintight Enclosures Installation
`lnstructions
`
`
`
`
`at
`
`A28 Temperature
`Control
`
`
`
`on temperature decrease.
`
`R to Y closes and R to 8 opens
`
` Rto Bcloses and RtoYopens
`
`
`
`9965452.oc|r
`
`on temperature increase.
`
`

`
`Installer must provide means of disconnection
`and overload protection as required.
`
`Checkout
`
`Before leaving the installation, observe at least three
`complete operating cycles of the controlled equipment
`to ensure that all components are functioning correctly.
`
`Adjust the dial to a lower or higher set point and check
`contact action of the switches to see that they are
`operating as illustrated in Figure 2, Figure 3, and
`Figure 4.
`
`Repairs and Replacement
`All A28 temperature controls are not field repairable.
`Do not attempt to repair any control that is not
`functioning properly. Contact your
`Johnson ControlslPENN® sales representative or
`authorized distributor for a replacement control.
`
`A28 Temperature
`
`Control
`
`Fan
`Motor
`
`Low Speed
`L1
`
`12 pm,
`Suwly
`L1
`
`5:,
`§
`3
`
`Figure 4: Typical A28 Control Wiring for
`Two-Speed Ventilating Fan
`
`Setup and Adjustments
`Turn the knob on the front of the A28 temperature
`control to adjust both of the control’s temperature
`setpoints simultaneously.
`
`
`A WARNING: Risk of Electric Shock.
`
`Disconnect all electric power sources from the
`A28 thermostat before removing the A28 thermostat
`cover. Contact with internal components carrying
`hazardous voltage can cause electric shock and
`may result in severe personal injury or death.
`
`
`All A28 thermostat models have a fixed differential on
`
`
`
`each switch. Some models have an adjustable
`inter-stage differential. To adjust those models with
`inter-stage differential:
`
`1. Remove the control cover and rotate the adjusting
`wheel counterclockwise to increase the
`
`differential. (Increase spread as per label on
`control).
`
`2. Use a small screwdriver and insert into serrated
`wheel at the lower left corner of the low
`temperature stage switch.
`
`3. Replace and secure cover with screws when
`adjustments are complete.
`
`
`
`A28PA and A28PJ Type Two-Stage Temperature Controls with NEMA Type 4X Raintight Enclosures installation
`instructions
`3
`
`

`
`Technical Specifications
`Product
`A28PA and AZSPJ Type Two—Stage Temperature Controls with NEMA Type 4X Raintight
`Enclosures
`
`AZBPA Type
`
`Rafi"9s
`
`277
`240
`208
`120
`24
`Agglied VAC
`-
`8
`9.2
`16
`-
`Motor. full load Amperes
`-
`48
`55.2
`96
`~
`Motor, locked rotor Amperes
`7.2
`8
`9.2
`16
`-
`Non-inductive Amperes
`125
`125
`125
`125
`125
`Pilot duty Volt-Amperes
`Total connected load not to exceed 2,000 VA
`
`A28PJ Type
`ii:-t';‘:)m°a'
`
`277
`240
`208
`120
`24
`Agglied VAC
`-
`3
`3.4
`6
`-
`Motor, full load Amperes
`-
`18
`20.4
`36
`-
`Motor, locked rotor Amperes
`72
`8
`9.2
`10
`-
`Non-inductive Amperes
`125
`125
`125
`125
`125
`Pilot duty Volt-Amperes
`Total connected load not to exceed 2,000 VA
`_______~
`
`Ambient Operating
`Temperature
`
`-26 to 140°? (-32 to 60°C)
`
`-40 to 140°F (.40 to 60°C)
`Ambient Storage
`Conditions
`_%
`
`Shipping Weight
`
`Agency Listings
`
`1.2 lb (0.54 kg)
`
`UL Listed; File E6688. CCN XAPX (US) and XAPX7 (Canada)
`UL Listed as Type 4X and for NEC Article 547 Agricultural Environments
`
`The performance specifications are nominal and confonn to acceptable industry standards. For application at conditions beyond these
`spedficafions, contact Johnson Controls Application Engineering at 1-800-2 75-5676. Johnson Controis. Inc. shall not be fiable for damages
`resulting from misapplication or misuse of its products.
`
`c ON
`
`Controls Group
`507 E. Michigan Street
`Published in USA.
`PO. Box 423
`
`Milwaukee. WI 53201 www.johnsonoontrols.com
`4 A28PA and A28PJ Type Two—Stage Temperature Controls with NEMA Type 4X Raintight Enclosures lnstallation
`Instructions
`
`
`
`

`
`NSON
`CONTR 3
`
`12‘!
`installation Sheets Manual
`Temperature Controls Section A28
`Technical Bulletin A28
`lssue Date 0988
`
`A28 Series Two-Stage Temperature
`Controls With NEMA 1 Enclosure
`
`
`
`Fig. 1 - Interior View showing high
`stage and low stage switches.
`
`
`A CAUTION: Do not dent or
`deform the sensing bulb of
`this control. A dent or
`
`deformation will change the
`calibration and cause the
`control to cycle at a
`temperature lower than the
`dial setting. When the bulb
`mounting clip is used to
`mount the bulb near the
`
`
`
`
`
`
`
`
`refrigerant tubing, be sure
`the sheet metal screw does
`not pierce the tubing.
`
`
`
`
`
`
`
`
`
`
`
`
`Fig. 2 - The A28 with remote
`bulb and convertible adjustment
`has a snap-in plug in the cover,
`a knob for field installation, and
`a bulb mounting clip with sheet
`metal screw.
`
`Installation
`
`Follow equipment
`manufacturers instructions if
`provided.
`if instructions are not
`provided, proceed as follows:
`
`Mounting
`Controls are normally mounted
`to a surface through holes in
`back of case.
`
`
`A CAUTION: On rough
`mounting surfaces use the
`top two mounting holes
`Only. When these controls
`are mounted on an uneven
`surface using screws in all
`four holes, the case can be
`twisted enough to affect the
`controls calibration and
`
`operation.
`
`
`
`
`
`Application
`These two-stage controls are
`designed to cover a broad range
`of general purpose operating
`temperature control applications
`in the refrigeration, air
`conditioning and heating fields.
`
`Two SPDT switches permit
`independent control circuits.
`Each switch may be wired for
`‘open high‘ or ‘close high’
`action, as required. providing
`automatic changeover on
`heating-cooling or similar
`requirements. Models are
`available with close differential
`on each switch. A jumper across
`the ‘common’ terminals is
`supplied as a standard feature.
`Models are available for fixed or
`adjustable between stage
`differential.
`
`All Series A28 temperature
`controls are designed for use
`only as operating controls.
`Where an operating control
`failure would result in personal
`injury and/or loss of property, it is
`the responsmility of the installer
`to add devices (safety, limit
`controls) or systems (alann,
`supervisory systems) that protect
`against. or warn of, control
`failure.
`
`Operation
`Figure 8 illustrates the operation
`of the AZBAA. On a temperature
`increase to the dial setting. the
`circuit between R and Y of the
`low stage switch (RYL) closes.
`Simultaneously the circuit
`between R and B (RBL) opens.
`On a further increase in
`temperature the high stage
`switch operates and closes RYH
`while simultaneously opening
`RB”. The reverse sequencing
`takes place on a temperature
`fall.
`
`For dosed tank applications
`without well assembly, Part
`FTG 13A«600R packing nut
`assembly may be supplied. See
`Fig. 4 for sequence of
`installation. Place parts over
`support tube section of the
`element, placing bulb into tank
`(be sure tank is drained so liquid
`level is below tank opening).
`Tighten the 1/2 in. NPT adapter.
`Screw packing nut into adapter
`with the retaining washers and
`packing in place as shown.
`
`To install models supplied with a
`bulb well, first install the bulb well
`into the tank opening. Remove
`bushing from the bulb well and
`slide the bushing over capillary.
`Place the bulb and bushing into
`the welt. Push bulb into position
`in bottom of the well. Tighten set
`screw in end of the adapter to
`hold bulb in position. See Fig. 5
`for bulb well installation.
`
`
`
`O 1988 Johnson Controls, Inc
`Code No. UT-121090
`Part No. 996-318
`
`

`
`Wiring
`
`
`A CAUTION: Disconnect
`power supply before wiring
`connections are made to
`
`avoid possible electrical
`shock or damage to
`
`equipment.
`
`
`
`Follow equipmem manufacturers
`diagrams if provided. Wlring
`should conform to local codes
`and the National Electrical Code.
`Vlfiring terminals of each
`
`;-851.3 SUPPORT ‘FUSE
`893-styhi swagedhulbwllh
`upponubobrclulp-onovclosed
`
`
`
`Hg.4-Psnmnb«nG13A«aonn
`pockhgmnuuombly.(lJauvlmStyle
`1 labwltluupponluholordtroct
`inuursbnnpplleutbnn.)
`
`ING
`FT SCREVI
`
`< Si
`
`I
`
`/42‘ um’ ABAPIER
`
`23-1:-—~e—-l-—-——=--—-l
`BER
`Ql_i£.E.§t5i£>_"_.'.€
`: E(mOKELl
`2'.all'Ill
`:E'.'1aA- com
`Fig. 5 —- Bulb well Ia Iqdd
`hlllotlloo Qplclflona when 1
`tenpcalure bulb may be removed
`
`RE nova
`sNAl>—m
`
`KNOB
`
`
`
`Adjustments
`All models have fixed differential
`on each Pennswitch. To adjust
`controls with belween—slage
`differential, rotate adjusting
`wheel counterclockwise to widen
`the differential Gncrease spread).
`Use a small screwdriver and
`insert into serrated wheel. (See
`Fig. 7.)
`
`Knob range adjustment or
`screwdriver slot adjustment
`supplied on range screw.
`Conveltible adjustment models
`can be field convened from
`
`an, moses
`as” ovens
`
`{ramp raw.
`
`na,_ OPENS
`
` mt CLOSES
`
`TEMP R155:
`DlAL SETTING
`
`R‘r,, orsns
`Ra, CLOSES
`
`mr oecns
`Rafi moses
`
`
`
`Ht-TEMP LO-TEMP
`sues
`sun:
`
`Fig. 8 - Swltcling pollen of the two—stage control ls
`Illustrated tn the sketch above, H3”, RY“ indicates
`l-ll-TEMP stage; REL, RYL, indicates LO-TEBP
`stage. "D" represents the dmeronllal between stages.
`
`run
`it counter ms was To
`LNLOADZR cnculr THAT uusr 3:
`Enencrzco to UNLOAD counnzssaa.
`
`
`
` COMPRESSOR
`
`"'
`
`COIPRESSOR
`CONTROL CRCJY
`
`UNLOADER CRCUI
`
`OE-EN€RG1ZES
`LPNLOID
`
`IO
`
`Flg.6—DruIlngshowInganIp-In
`plugremovednndlheknoblnllmla
`tssca!bh.Pnsathelmcbontoihc
`slonadshnn.
`
`
`Fly. 9 —— Typlcnl wlrlng diagram at a refrigeration
`compressor wlth alngle stage unloads. Two compressor
`nackaaes man be sauumoed with same elrcull.
`
`2 A28 Tedlrical Buletin
`
`
`A CAUTION: Use terminal
`screws furnished (8-32 x
`1/4 in. binder head).
`Substitution of other screws
`may cause problems in
`making proper connections.
`
`
`
`
`
`
`
`
`
`
`
`Fly. 7 -—— Between-stages dlflnrential
`cm be Increased by rotating Adjusting
`can counterclockwlso as Illustrated
`shove.
`
`Pennswitch are color coded for
`convenience and to simplify
`wiring. Red is the common
`tenninal; red to yellow circuit
`closes on temperature increase.
`red to blue circuit opens on
`temperature increase. Use
`copper conductors only.
`
`

`
`
`
`Notes
`
`NSON
`8
`
`C
`controls Group
`507 E Michigan Street
`PO. Box 423
`Miwaukee, W! 53202
`
`4 A28Ted'InidBu¥1e6n
`
`Prhted 'I1 USA.
`
`

`
`-.1,:
`
`
`with NEMA1 Enclosure
`
`125
`Master Catalog
`Temperature Controls Section A
`Product Bulletin A28
`Issue Date 0988
`
`A28 Series Two-Stage Temperature Controls
`
`Appflcafion
`
`These two-stage controls are
`designed to cover a broad range
`Of generag purpose operating
`gemperagme mum appggcafions
`in the refrigeration’ air
`conditioning and heating fields.
`.
`,
`
`Each switch may be wired for
`‘open mghl of "dose high.
`action, as required. Models are
`available with close differential
`on each switch. A jumper
`across the “common” terminals
`is supplied as a standard
`fe tu .
`a re
`_
`_
`Specrficatsons
`
`Models are available for fixed or
`adjustable between stage
`differential,
`,
`All Series A28 temperature
`controls are designed for use
`only as operatmg controls.
`Where an operating control
`failure would result in
`personal injury andior loss of
`Sezgfinzgisigggfethe installer
`to add devices (safety limit
`'
`°°“”°'5) °" 5V5‘'’"‘‘ “"3"”-
`5“P°""5°"Y 5Y5t°"’5) ma‘
`P'0‘9€13935"5t» 0" ‘"3"’ 07»
`00711703 failure-
`
`,‘
`»«
`
`
`
`Fig. 1 - Exterior of the A28.
`Knob range adjustment is
`shown.
`
`Features
`-
`‘Repeat’ accuracy which is
`unaffected by barometric
`pressure and cross ambient
`temperature problems.
`- Dependable single-pole.
`double-throw snap acting
`contacts in dust protected
`enclosure.
`‘
`i
`.
`- Special close dlfferentral
`models available for critical
`requirements.
`
`Numb‘,
`
`Tm
`I
`condull
`com”!‘won
`sync“
`Dmumzm
`5,, mm
`Hug‘,
`“"""'
`smwlw
`Wtlnhl
`
`A28AA
`A28A.I
`
`Two SPDTswttchss. Standard txlierantial
`r'wo"""sa=or""’e.vater»os. c‘lose our
`at; (:2 mm) Dia Hole 701:: 112' Co£:t.i1m
`as
`allow
`see on errpera
`e
`Red to Blue Opens on Ternperamre Rise
`SPOT. Snap-Ading Contacts in Dust
`Pr°l°Ct0d Enclost-Y0
`7:33
`Each Switch
`Adjustable
`Fixed. 5
`‘
`Between
`0.
`(1.53; Gold Rdled sneer "“"‘
`Case
`0%" 0.6
`)§6la ml3'a‘§._e("““"‘
`co
`( mt:
`,3,
`W
`" .1.5
`lntlvlduflslck
`(0
`g)
`5°C':; pi.“
`56 b (5 kg)
`
`
`
`Range and Bulb Specifications
`Maximum Bulb Wiurb
`Adina:-bk
`Dltfererslel 'r=('Q
`Temperature(2)
`Size
`Ragnar!) daelwaen Stages
`‘F ‘c
`in mm)
`'
`'
`ndml
`close
`A iustabis or
`and
`140
`.575x4
`-aotoeso
`5
`25
`zmorass
`(so)
`(9.5 x 102)
`(~35 to +10)
`(2.8)
`(1.4)
`(1.1 to 3.9)
`140
`.37$x5
`20505)
`3.5
`2
`2to7as pacified
`(60)
`(9.5 2: I27)
`(-7 to +28)
`(1.9)
`(1.1)
`(1.1 to 3.9)
`140
`375326
`401090
`3
`1.5
`2to7e.sSpocifled
`(60)
`(9.5 x 152)
`(5 lo 30)
`(1.7)
`(0.8)
`(1.1 to 3.9? H
`140
`.094 x 144
`aoxo 110
`3.5
`2
`2 lo 7 as spoemod
`(so)
`(24; 3655)
`(0lo43)
`(1.9)
`(1.1)
`(1.1 to 3.9)
`(I) Olaoruvaleble nmgamqusillyorclorswe-20to+60'F{—ato+16‘C).-10to+70'F(—~z3to +z1'c). A010 120‘F(5 to AUG). 50 to 2oo‘F(1o2o9o'c).
`eon rao’F(1snss°c). eon 14(I'F(15 b60‘C) rd K1323 2301; (4093 IZTCJ.
`(2)Mukru1-Ibtbbnperuxevtldmndaruicmwuunaruddhns¢uuiHervaba:hgheledIwcorhul,mchusfipphgca~diluu.TNshnd
`Intanpeuhtewhlchluomuelcanwiiutmdmrepeatcycloa.
`(3)Styb4!IwlIhodbyI.IshgStyle Twmslppotttbo mdaddhg F!'G13A-5!!HpaddngI1u!asuI'r1bfirlalIZ'hPTlap;Jng.
`
`G 1988Johnson Cor-trots. inc
`1
`CodeNo. UT-125130
`
`Bulb
`Style
`3
`lor
`4
`‘lot
`4
`wt
`4
`9
`
`

`
`
`
`Fig. 2 - interior View showing
`high temperature (stage)
`and low temperature
`(stage) switches.
`
`General Description
`
`Controls are compact with
`nonadjustabie differential on
`each switch. Knob range
`adjustment and visible scale are
`standard. Models are available
`with a knob for field oonvenible
`adjustment. These models are
`supplied with a snap-in plug in
`the cover for concealed
`screwdriver slot adjustment.
`other feature% include a liquid-
`filled. copper sensing element
`which is unaffected by
`barometric pressure and cross-
`ambient temperature problems.
`
`Conuols may be supplied for
`immersion applications for use
`with a closed tank connector or
`with a bulb well assembly. A low
`cutout stop, which can be set in
`the field. is an integral part of the
`control.
`
`Optional Constructions
`
`Ambient Compensation
`Available at extra cost.
`
`Bulb
`
`Coil bulb for low movement air
`application may be supplied.
`Also available is a 3/16 in.
`(4.76 mm) diameter by 22 in.
`(558 mm) long bulb for detecting
`the average temperature in air
`ducts.
`
`Capillary
`
`Capillary longer than 6 feet
`(1.8 m) available at extra cost.
`Capillary from 6 to 10 feet (1.8 to
`3 m) in 2 foot (0.6 m)
`increments; over 10 feet (3 m) in
`5 foot (1.5 m) increments.
`
`Packing Nut
`Part No. FTG 13A-600R is
`available for closed tank
`applications where the
`temperature does not fall below
`—35°F (—37°C) or exceed
`+250°F (12t°C).
`
`Maximum liquid pressure limit is
`150 {>559 (1034 kPa). For
`applications where the
`temperature or liquid pressure
`exceeds these limits. specify
`Style 4 element with all metal
`packing nut as an integral part of
`the control.
`
`Range Adiuster
`Screwdriver slot with visible
`scale or screwdriver slot with
`internal scale and solid cover
`optional at no extra cost
`(quantity orders only). Models
`are available with knob. snap-in
`plug and remote bulb mounting
`clip for field convertible
`adjustment This provides
`conversion to knob. conceaied
`screwdriver slot or external
`screwdriver slot adjustment.
`
`nznovs Z
`
`noausrusur
`
`
`
`Fig. 3 - Drawing showing
`snap-in plug removed and the
`knob in line to assemble. Press
`the knob onto the slotted shaft.
`
`277
`
`ectrical Ratings
`A28AA— Standard Differential
`200
`Vo Ac
`120
`299,...
`16.0
`9.2
`Fm Load Nrp
`$53 @155
`N51"-Fs'6'u—cll\7o or
`Resistance Load Arrp
`(Not L819 Loads)
`
`96.0
`
`1&0
`
`552
`
`9.2
`
`48.0 W —
`
`3.0
`
`7.2
`
`fig! Duty -— 125 VA, 2412?? VIC
`N0TE:M'uninoduatwod2mlaxld\.tnwhlccwnaodbadm.ntrntuxcoodzJ00VA
`
`AZBAJ - Close Differential
`V
`AC
`Pm Load Amp
`Locked RotorW
` ' or
`Roddanco Load Arnp
`(Not Lamp Loads)
`""" “"'*“""‘—r=tioxDuty — 125''\7A. 24/2—‘r7v~c
`
`Noifitmunuodasatwoctrwksnldxmnbtulccmoctodhadmsumtoxcoodznovk
`
`2 A28 Product Bulletin
`
`240
`3.0
`18.0
`
`8.0
`
`277
`-
`-~
`
`7.2
`
`120
`an
`36.0
`
`10.0
`
`208
`3.4
`20.4
`
`9.2
`
`

`
`ordering [nformafion
`
`T0 Ofdef» SPBCW1
`
`1- Type number (see Type
`Number Selection).
`
`2. Range required.
`
`3. Between-stage differential
`(nonadjustable models
`only).
`
`4. Capillary length, if other
`than 6 feet (1.8 m).
`
`5.
`
`Packing nut assembly or
`bulb weil. if required.
`
`1:;_
`
`-‘BULB SUPPORT TUBE
`
`
`
`Fig. 4 -Styte 1 swaged bulb
`with support tube for clamp-on
`
`or closed tank applications N1 ERLOCKSNG
`
`6.
`
`Specify type of range
`.
`_
`ad;ustment if other than
`knob adjustment.
`
`_
`Repairs and Replacement
`
`Field repairs must not be made.
`For a replacement control,
`contact the nearest Johnson
`Controls wholesaler.
`
`CUIOUT STOP BRAC-KEY
`WU’?! SLO? AND SCREW
`
`
`
`ncmuc MIT .§,ir§.§§§
`
`:/2" NF? ADAPTER
`
`
`am, supp”,
`\ncmo '
`W3‘
`
`Fig. 7 — Between-stages
`differential can be increased by
`mmungnflaardcjlustgf cam
`cw
`cc
`‘Se
`as illustrated above.
`
`Fig. 8 - The controls have a
`screw type cutout stop. The
`stop
`W must be I
`and moved to the stop setting
`desired. Tighten screw after
`setting is made_
`
`h C?
`‘
`
`n ®
`
`9
`F)
`STAGE
`
`Hl-TEMP LO-TEMP
`
`smog
`
`RY" CLOSES
`Ran OPENS
`
`3;: gggilgs
`
`€75”? FAU-
`
`R”! OPENS
`"RB: CLOSES
`
`
`
`TEMP RISE} / Rat cuoses
`
`av opens
`
`0”“ 35"“
`
`Fig. 5 - Part Number
`FTG13A-600R packin nut
`
`assembly. (usewigh
`
`Style 1 butb with support tube
`fordirect immersion
`applications.)
`
`5 5“'"°
`K SET SCREW//IQ‘ upr ADAPTER
`iillmjl
` L)
`
`I,” la:
`‘*3
`
`5
`
`A
`
`.
`‘
`
`.
`
`.
`
`webfifi-23§'§
`WEU8A' SOIR
`
`same)
`Z.5l K?!)
`
`Fig. 6 - Bulb well for liquid
`immersion applications where a
`temperature bulb may be
`removed without draining tank.
`
`Fig. 9 — Switching action of the two-stage control is illustrated
`in the sketch above. RB... RYH indicates HI-TEMP stage; RBL, RYL indicates
`LOJEMP stage. “D” represents the differential between stages.
`
`
`
`A28 Product Bullefn
`
`3
`
`

`
`JUIPIR
`
`POWER
`SPPLY
`
`tcomzcr ms was Tore-sz
`UELOADER CIRCUIT T!-{AT K151’ Ci
`mascara Y0 uuoao coutvnzssoxt
`
`COHPRESSOR
`LNLOADCH CRCU .
`%JFRE§'W
`COPWRG. @5117
`
`m
`
`Fig. 10: Typical wiring diagram of a refrigeration compressor with single-stage unloader.
`Two compressor packages may be sequenced with the same circuit.
`
`
`
`.34
`73 F”
`Hist: Lzarsn-""¥
`J.
`._f3"?
`‘‘
`i~§%._.
`
`iii
`
`"3-W ~{-%?1~——
`CIPILLARY LUGGTN AS SPECIHCG
`
`I 2Wo.oL<:y_§12u:;$.'$3.35 Optional Homigxxg Bracket
`
`__ _73%_ ____:_,l
`Dimensions 5;
`Performance specifications appearing herein are nominal and are subject to
`accepted manufacturing tolerances and application vafiables.
`
`C SON
`
`'
`
`UL Guide No. XAPX
`File No. E6688
`
`CSA crass No. 4813 02
`
`Fne LR948
`
`Controls Gmup
`507 s. Mchiganstreet
`F’.O. Box48
`Printed in USA.
`Mlwaukee, WI 53201
`
`4 A28 Product Bulletin
`
`

`
`J
`CONTR’
`
`NSON
`S
`,
`
`125
`Master Catalog
`Temperature Controls Section A
`Product Bulletin A28
`issue Date
`1291
`
`Controls Less Enclosure
`
`A28 Series Two-Stage Temperature
`
`Applition
`
`These two-stage open type
`temperature controls are
`designed for mounting in cases or
`enclosures that are a part of the
`equipment on which they are
`installed. Controls are designed
`to cover a broad range of general
`purpose operating temperature
`control applications in the
`refrigeration, air conditioning and
`heating fields. Two SPDT
`switches permit independent
`control circuits. Each switch may
`
`be wired for ‘open high” or “close
`high‘ action as required, providing
`automatic changeover on heating-
`cooling or simiiar requirements.
`Available with close differential on
`each switch. A jumper across the
`‘common’ terminals is supplied as
`standard. Models are available
`for fixed or adjustable between
`stage differential.
`
`failure would result in personal
`
`All Series A28 temperature
`controls are designed for use
`Omy as operaung comm‘;
`Where an operating control
`
`Fig. 1 — The AZBGA with
`calibrated dial and pointer.
`
`.
`.
`'"’“'”"‘*’°"‘."i°‘ *"°"°"V' “
`is the responsibility. of the
`installer to add devices (safety,
`limit controls) or systems
`(alarm. $0536“/35°?! Systems) f
`that protect against, or warn o ,
`control failure.
`
`Features
`
`_
`,
`_
`_
`0 Dependability —~ precision
`snap-acting contacts in a dust
`protected enclosure.
`
`M
`
`- Special close differential
`models with case
`compensation of ambient
`temperatures available for
`critical req uirements.
`
`0 Flexihiiity -— wide choice of
`Electflcal Ratings
`
`ranges. mounting and element
`Au“ __ sumdam Dmermual
`SW95‘
`v
`AC
`120
`208
`240
`277
`0 Precision repeat accuracy
`3:3
`53
`£3
`"
`?
` which is unaffected by
`mdsmmmaa Amy
`15,0
`92
`am
`72
`barometric pressure and cross
`(Not La-rip Louis)
`ambient problems.
`
`PilotDuty—125 VA, 24 to277VAC
`"$?STBct‘ng.Toflcanndodl:iiid mint rid eiioeod2m0VA.
`
`
`A28G.l —— close Differential
`vogg, Ac
`W I-086 N“?
`E5363 l% Amp v
`W [W or
`Hosistarico Load Amp‘
`(Not Larrp Loads)
`
`240
`3.0
`13.0
`
`8.0
`
`.
`
`‘ '
`
`217
`-
`-—
`
`7.2
`
`120
`E0
`36.0
`
`10.0
`
`zoo
`3.4
`20.4
`
`9.2
`
`F|'Efifi- 13 V‘: 24l0277VE
`'TotaioariocIodloadrrii.iutnot¢ieoodzXnVA.
`
`0 1991 Johnson Controls, Inc.
`1
`Code No. UT-125125
`
`Specifications
`
`A28GA
`
`T
`
`SPDT Switches. Standard Diff
`
`ritiai
`
`
`
`"""""“’°'
`Switch
`_
`um" '
`Finish
`Hawk‘
`
`H"
`
`. Came . D“
`SPOT. 3
`W“ &,C'‘Gang
`3 n
`t
`pmd
`5”}, swmh
`AdjustableorFixed, Asspocified
`Between sages
`zinc man
`0.063’ (1.6 i-rm) Cold Boiled Steel
`Bueplau
`0.050‘ (1.3 mm) Cold Boiled Stool
`Frame
`0.8 lb (0.36 kg)
`hdividlil‘ Pack
`34 lb (15.4 kg)
`‘°°"u'nP‘hs
`Shipphg
`weight
`Bum PM
`
`50 Units
`44 b (20 kg)
`
`

`
`mzntocxmc
`PACKING NUT },"‘fiI;‘,;:‘,{f*,\ I/2" m=\r‘ ADAPTER
`
`
`
`BULB sueecm
`rue:
`
`PACKWG *
`
`Fig. 3 -— Part Number FTG13A-6008
`packing rlul assembly. (Use with Style
`1 bulb with support tube for direct
`immersion application.)
`
`3.
`
`Factory sealed setting
`(Fig. 10).
`
`4. Calibrated dial and pointer,
`with factory adjustable (not
`field) low cutout or high
`cutout stops when specified
`on quantity orders (Fig. 8).
`
`Example: Low temperature
`thermostat may have low cutout
`stop set from -10 to —30°F (-23 to
`-34°C). High cutout stop may be
`set from +30 to +50°F (-1.1 to
`10°C).
`
`Sums
`B‘ 557 SCREW/1/2' NPT ADAPTER
`
`234 l——&§g—~l~————A—————-l
`rv
`omensson ‘A’
`wEt.iaA-sooatMoN£t.)
`41502:)
`weL:4A- scan
`4.940251
`VIELl4A- 503R
`5.8ltl4Bl
`WELl6A- 60lR
`2.8ll7ll
`
`-Fig. 4 —— Bulb well for liquid
`immersion applications where a
`temperature bulb may be removed
`without draining tank.
`
`’
`
`General Description
`These controls have a
`nonadjustable differential on each
`switch. Available with 1/4 in. shaft
`and choice of .156 in. or .187 in.
`fiat for knob mounting (knob not
`suppiled). screwdriver adjustment
`or factory sealed setting on
`quantity orders (see Optional
`Constructions). Standard shaft
`rotation is clockwise for warmer
`Mien facing adjusting shaft. Also
`available with calibrated dial and
`pointer.
`
`Other features include a liquid-
`filled, copper sensing element
`which is unaffected by barometric
`pressure and cross ambient
`temperature problems. Controls
`may be supplied for immersion
`applications for use with a closed
`tank connector or with a bulb well
`assembly.
`
`
`
`
`A CAUTION: Do not dent or
`deform the sensitive bulb of
`
`this control. A dent or
`
`
`
`deformation will change the
`
`
`calibration and cause the
`control to cycle at a
`tempera