BULKY DOCUMENTS
`
`(Exceeds 100 pages)
`
`Proceeding/Serial No:
`
`77612039
`
`Filed:
`
`8[24[2010
`
`Title: REQUEST FOR RECONSIDERATION APTER
`FINAL ACTION.
`
`Part
`
`2
`
`of
`
`2
`
`
`
`

`
`NSON
`CONTRS
`
`FANS 121, 125
`Temperature Controls Section
`Product Bulletin
`issue Date
`
`A
`A1 QAUC, A1 QBUC
`1091
`
`Types A19AUC, 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.
`
`-
`
`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 Ii,
`Groups E, F and G (NEMA 9)”
`as defined in the Nations?
`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
`sysgems (313.-m, supervisory
`systems) that protect against,
`or warn of, control failure.
`
`- UL Listed. CSA Certified for
`“Hazardous Locations.“
`
`Fig. 1 - A1 QBUC themiostat
`with air bulb.
`
`General Description
`
`The temperature sensing
`elements are liquid filled,
`providing uniform differential
`throughout the selected
`adjustment range. Remote bulb
`elements are regularty supplied
`with a 6 foot. (1.8 m) capiliary.
`Requests for other construction
`'
`tions should be sent to
`gm:
`5
`-
`Us omef emce‘
`The range adjustment changes
`the cut~m and cutout points
`atike. The differential is
`nonadjustable.
`
`
`
`1
`=. £1:
`
`,_
`
`..
`
`<
`
`_ I
`3
`
`Fig. 2 - Interior View of the
`A1 SAUC with clamp on bulb.
`
`tad
`
`These thermostats are suitable
`.
`.
`for installation in hazardous
`spec‘fi°au°"s
`A
`*%*** locations as defined in the
`Type Numb”
`19AUC SPOT Contact Acton. Remote Sensing Element
`National E18cmcal Code, where
`A19BUC SPOT Contact Action, Coiled Bulb
`mag, Oman,“ d
`_
`the atmosphere may contain the
`
`
`See Selection and Range Tablauaimhm Tempemge following;
`E"°‘°’‘"‘’
`“*4 ‘-‘Sid ’°’ Hi‘-‘Za"d°“3 l—°°3°°"$
`1. Certain vapors and gases.
`Snap— ti Contactsi Dust Prat
`S‘lm°h
`Enclcsurang
`n
`Sc
`2. Dust such as aluminum,
` magnesium or their
`Finish
`.
`Naval Aiumnum
`commercial alloys.
`.
`conduit Opening
`V2‘ Female NP?
`§:;:’$°” mack‘ °°a' °’ “°k°
`3‘
` g;am9.,,,Hd.s
`'
`_l:TllT‘ng
`
`
`5hlPPh9 Weight Flour, starch or grain dusts. 2.6 lb (1.2 kg) 4.
`
`O 1991 Johrson Controls. lnc.
`Code NO. LIT-121035
`Pat‘! No. 3544, Rev. i
`
`
`
`
`
`1
`
`

`
`
`
`installation instructions
`issue Date
`
`August 24, 2005
`
`
`
`A28PA and A28PJ Type Two-Stage Temperature Controls
`with NEMA Type 4X Raintight Enclosures
`
`
`
`
`
`Application
`
`
`IMPORTANT:
`The A28PA and A28PJ Type
`Temperature Controls are intended to control
`
`equipment under normal operating conditions.
`Where failure or malfunction of an A28PA or A28PJ
`temperature control could lead to an abnormal
`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 A28P.l
`
`temperature control must be incorporated into and
`maintained as part of the control system.
`
`
`
`
`
`
`
`
`
`
`
`
`
`Operation
`The circuit between R and Y of the low stage switch
`(RYL) closes, and R and 8 (RB._) opens on
`temperature increase to the setpoint (dial setting). On
`a further temperature increase, the high stage switch
`closes RYH and opens RBH. The reverse sequence
`occurs on a temperature decrease.
`
`installation
`
`Dimensions
`
`I
`
`2-13/16
`71
`
`,
`
`i
`
`«.5
`--2
`
`ll’)-:If!‘U(B(B
`
`Figure 1: Dimensions for A28PA and A28PJ Type
`Temperature Controls with NEMA Type 4X
`Enclosures, in.lmm
`
`The A28PA and A28PJ type two-stage
`electromechanical 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 A28P.l controls are also UL Listed for use
`in National Electrical Code (NEC) Article 547
`Agricultural Environments (ANSIINFPA 70).
`
`Two Single-Pole, Double-Throw (SPOT) switches
`allow independent stage control circuits. Each switch
`may be wired for open-high or c|ose—high action,
`providing automatic changeover on heatinglcooiing
`applications. A jumper across the switches‘ common
`(red) terminals 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
`
`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 l40°F (60°C).
`1
`www.johnsoncontrols.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.
`
`wiring
`
`
`A WARNlNG: Risk of Electric Shock.
`
`Disconnect each of multiple power supplies before
`making electrical connections. More than one
`disconnect may be required to completely
`de—energize equipment. Contact with components
`carrying hazardous voltage can cause electric shock
`and may result in severe personal injury or death.
`
`
`
`
`
`
`
`
`
`
`
`insert wire through conduit opening.
`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 adjustment knob.
`
`‘-°“’ 75""? W9“ T°"‘P-
`Stage
`Stage
`
`Lowa dH‘ h Tem rature
`Stagegwit::gl'i.Actior'1eis:
`
`R to B closes and R to Y opens
`on temperature decrease.
`
`R to Y closes and R to 8 opens
`
`
`
`
`
`All wiring must conform to all
`IMPORTANT:
`local, national, and regional regulations. Use copper
`conductors only for all wire connections.
`
`<3)
`
`6
`
`on temperature increase.
`
` 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 control‘s label.
`
`
`
`
`
`
`A28 Temperature
`Control
`
`
`
`996545_2.cdr
`
`Use only the terminal screws
`IMPORTANT:
`iumished with the switch. Using other screws in the
`switch voids the warranty, may damage the switch,
`and may cause problems in making secure
`
`connections.
`
`V\firing terminals of each switch are color coded to
`simplify wiring. Red (R) is the common terminal. The
`red to yellow (Y) circuit closes on temperature
`increase and is typically 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 screwdriver handle to
`'°°5en the k"°°k°”L
`
`Figure 2: A28 Temperature Control Switch Action
`
`
`
`Connect WY
`g
`for cooling.
`A28 Temperature :8 gs,
`
`
`Control
`'
`g
`
`I
`Figure 3. Typical A28 control “firing for
`Two-Stage Control Circuit
`
`
`
`2 AZSPA and A28PJ Type Two—Stage Temperature Controls with NEMA Type 4X Raintight Enclosures installation
`instructions
`
`

`
`lnstaller must provide means of disconnection
`and overload protection as required.
`
`Checkout
`
`Before leaving the installation, observe at teast 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 itlustrated 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 ControlsIPENN® sales representative or
`authorized distributor for a replacement control.
`
`
`
`99e54s_4.ca.
`
`9 Q
`
`Factory
`3
`installed
`<———————-— Jumper
`High Speed‘ To
`To
`Fan
`LOW Speed
`L2 Power
`Motor _.:—.-.——.-......__.........___—__..
`Supply
`L1
`L1
`
`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 controls 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 modeis 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 Twostage Temperature Controls with NEMA Type 4X Raintight Enclosures installation
`Instructions
`3
`
`
`
`High
`Temperature -~;.
`
` A28 Temperature
`Control
`
`
`
`4-’ Temperature
`
`

`
`Technical Specifications
`
`Product
`A28PA and A28PJ Type Two—S1age Temperature Controls with NEMA Type 4X Raintight
`
`Enclosures
`
`A28PA Type
`Swim“ ,E'e°m°“' Rafi”9S
`(per swmh)
`
`277
`240
`208
`120
`24
`Applied VAC
`-
`8
`9.2
`16
`-
`Motor, full load Amperes
`-
`48
`55.2
`96
`-
`Motor. locked rotor Amperes
`72
`8
`9.2
`16
`-
`Non-inductive Arnperes
`Pilot duty Volt—Amperes
`125
`125
`125
`125
`125
`
`Total connected load not to exceed 2000 VA
`
`A28PJ Type
`PE'f‘N® switch '.5'°°m‘°a'
`Ratings (per Swltch)
`
`120
`24
`Applied VAC
`6
`-
`Motor, full load Amperes
`36
`~
`Motor, locked rotor Amperes
`10
`-
`Non-inductive Amperes
`125
`125
`Pilot duty Volt-Amperes
`Total connected load not to exceed 2,000 VA
`
`208
`3.4
`2014
`9.2
`125
`
`240
`3
`18
`8
`125
`
`277
`—
`-
`7.2
`125
`
`
`
`Ambient Operating
`Temperature
`
`Ambient Storage
`Conditions
`
`-26 to 140°F (-32 to 60°C)
`
`40 to 140°F (40 to 60°C)
`
`1.2 lb (054 kg)
`Shipping Weight
`UL Listed; File E6688, CCN XAPX (US) and XAPX7 (Canada)
`Agency Listings
`
`UL Listed as Type 4X and for NEC Article 547 Agricultural Environments
`
`The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
`specifications, contact Johnson Controls Application Engineering at 1-800-275-5676. Johnson Controls, Inc. shalfnot be liable for damages
`resulting from misapplication or misuse of its products,
`
`CONTR 8
`
`ON
`
`Controls Group
`507 E. Michigan Street
`Published in USA.
`PO. Box 423
`
`Milwaukee. WI 53201 www.jol:nsoncontroIs.com
`
`4 A28PA and A28PJ Type Two-Stage Temperature Controls with NEMA Type 4X Ralntight Enclosures lnstaliation
`Instructions
`
`

`
`NSON
`CONTR S
`
`121
`lnstallation 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 oi
`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.
`
`All Series A28 temperature
`controls are designed for use
`only as operating controls.
`Vwiere an operating control
`failure would result in personal
`injury and/or loss of property. it is
`the responsibility of the installer
`to add devices (safety, limit
`controls) or systems (alarm,
`supervisory systems) that protect
`against, or warn of, control
`failure.
`
`Operation
`Figure 8 illustrates the operation
`of the A28AA. On a temperature
`increase to the dial setting. the
`circuit between R and Y of the
`low stage switch (RYQ closes.
`Simultaneously the circuit
`between R and B (RBL) opens.
`On a further increase in
`temperature the high stage
`switch operates and doses RYH
`while simultaneously opening
`RB". The reverse sequencing
`takes place on a temperature
`fall.
`
`For closed tank applications
`without well assembly, Part
`FT(3 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 me bulb and bushing into
`the well. Push bulb into position
`in bottom of the wetl. Tighten set
`screw in end of the adapter to
`hold bulb in position. See Fig. 5
`for bulb well installation.
`
`
`
`Q 1988 Johnson Controls, Inc
`Code No. UT-121090
`Part No. 996-318
`
`
`
`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 CAUTlON: 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
`heatingcooling 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.
`
`

`
`
`
`Fig. 7 —— Between-stage: dlflerentlat
`can be Increased by rotating ldfustlng
`cam counterclockwise as Illustrated
`above.
`
`Pennswitch are color coded for
`convenience and to simplify
`wiring. Red is the common
`terminal; red to yellow circuit
`closes on temperature increase,
`red to blue circuit opens on
`temperature increase. Use
`copper conductors only.
`
`
`
`
`
`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.
`
`
`
`
`
`
`
`
`
`Adjustments
`All models have fixed differential
`on each Pennswitch. To adjust
`controls with between-stage
`differential, rotate adjusting
`wheel counterclockwise to widen
`
`the differential (increase spread).
`Use a small screwdriver and
`insert into serrated wheel. (See
`Fig. 7.)
`
`Knob range adjustment or
`screwdriver slot adjustment
`supplied on range screw.
`Convertible adjustment models
`can be field converted from
`
`an, moses
`R5,, ovens
`
` ax, CLOSES
`
`DIAL SETTING
`
`{TEMP Fax.
`
`rm, oeems
`RB,‘ crosss
`
`rm OPENS
`93L moses
`
`
`
`Fig. 8 — Svrhching acllon of the two-stage control ls
`Illustrated in the sketch above, R3“. RY" indicates
`HI-TEMP stage; R33, BYL, indicates LO-TEMP
`stage. “D' represents the dlfferantlal between stages.
`
`ma
`1: comazcr ms WRE ‘:0
`WLOADER csacuur nur uusr at
`Entkcxzto m UNLOAD coumzzssca.
`
`
`
` ;,———__.1 couexessoa
` t
`
`—w-—
`
`cownssson
`
`comm; Cutcur
`
`J>UNLDADER crncuzr
`
`DE-ENERGIZES I0
`UNLOAD
`
`Fig. 9 —— Typical wiring diagram of a relrfgoruflon
`compressor with single stage unloader. Two compressor
`nackaues may be savuuenoed with some otrcult.
`
`Wiring
`
`
`
`
`
`
`A CAUTION: Disconnect
`power supply before wiring
`
`connections are made to
`avoid possible electrical
`shock or damage to
`equipment.
`
`
`
`
`Follow equipment manufacturer's
`diagrams if provided. Wiring
`should conform to local codes
`and the National Electrical Code.
`Wiring terminals of each
`
`BULB SUFPDGT TUBE
`e
`Flg.3—StyIa 1 singed bulb with
`support um ht dampen or closed
`but Ipplicfllons.
`
`NTERLDCXNG
`
`PACKNC rut
`
`1/7‘ Ne.’ warren
`
`
`
`Fig. 4«-Pan NI.InborFTG13A-6003
`packing not assembly. (Use with Style
`1 btlbwfthsupportlubctordtract
`llmncrslon tppllcallom.)
`
`INC
`
`SET 5CR5W/V2’ rm xsozmrse.
`IE
`
`e+—-we-+-—s———l
`eul.a 1r_§,,*3, uumazn
`l2I_!tE.-“i.§:°.£!_E
`wand:-$00R(uONELl
`4.75ll2!)
`wELs4A- 602R
`4.94l-25)
`wELIu- sass
`5.5H|48t
`s£1.I6A— sole
`2.55171)
`Fl9.5-Bulh\velHocilquld
`lmnonlon npplcntlom when a
`temperature bulb may be removed
`without draining tank.
`
`REMOVE
`SNAp_'N
`PLUG
`
`ADJUSTMEN7
`SRAFT
`
`
`
`.3gaǤ
`Fig. 6 — Drawing showing snap-in
`plug removed and the knob in line no
`assemble. Press the knob onto the
`slotted shaft.
`
`KNOB
`
`
`2 A28 Technical Buetin
`
`

`
`Notes
`
`NSON
`CONTR S
`
`Comrols Group
`507 E. Michigan Street
`P.O. Box 423
`Milwaukee, WI 53202
`
`4 A28 Technical Builetin
`
`Printed in USA.
`
`

`
`J
`CONT}?
`
`NSON
`S
`/
`
`125
`Master Catalog
`Temperature Controls Section A
`Product Bulletin A28
`issue Date 0988
`
`with NEMA1 Enclosure
`
`A28 Series Two-Stage Temperature Controls
`
`Application
`
`These two'stage controls are
`designed to cover a broad range
`0; genyag purpose Gperafing
`gemperamre com,-0; appggcatgg,-,5
`;n the yemgerafion, 3;;
`conditioning and heating fields.
`Two spar switches permit
`independent control circuits.
`Each switch may be wired for
`.0pen high. or "dose high”
`action, as required. Models are
`available with close differential
`on each switch. Ajumper
`
`across the “common” tenninals
`is suoplied as a standard
`feature.
`
`_
`Specifications
`
`Models are available for fixed or
`adjustable between stage
`differential.
`_
`All Series A23 temperature
`controls are desxgned for use
`only as operating controls.
`Where an OPGYWWQ ¢°”"°'
`"":::’ ‘;’l";“!fi ’"'“:§1"‘ 1
`5 of
`pa
`" 3. ryhan or 05
`"’°"“’"V.' ’.‘.'s ‘ °
`.
`responsibility of the mstaller
`‘'3 add de‘"°“’s ‘Safety’ "rm
`°°“t’°:5) °" systems (313m)
`SUPG"-45°F? 5Y5"9*'“5i that
`
`P7019“ 893%“. 0? War“ 07,
`contra? failure.
`
`,’
`1.,
`g
`
`K
`
`{
`
`{
`
`
`
`‘
`
`'
`
`-
`
`-
`ffik
`1"? -'7'
`‘.4
`
`Fig. 1 - Exterior of the A28.
`Knob range adjustment is
`shown,
`
`sa
`
`Two SPOT Switches, Standard Differential
`AZBAA
`7'” """“’°’ e
`Conduit only
`E? m%; Hole to; V2‘ Co::Ln‘it¥
`Features
`ses on ampere
`a
`Conn?! Ado“
`Red to Blue Opens on Temperature Risa
`o
`“Repeat” accuracy which 35
`swnd,
`SPOT, Snap~Acting Contacts in Dust
`unaffected by barometric
`Pf°*°¢i95 EWIOSUVG
`pressure and cross ambient
`
`
`._.m«__....._._._..E°°*'3“"“=h Fug. _
`temperature problems.
`Batman,-in Stages Adjustable CI Fntad. As 5
`.
`ifiad
`Case §m """— - Dependable single-note.
` double-throw snap acting
` contacts in dust protected
`smpping
`yngsygdmg pug
`1.1 (8 (05 kg)
`‘ "“““ ‘
`‘ “
`enclosure.
`of
`5'3 35 (25 *9}
`W959”
`- Special close differential
`
`j"‘“*”“"“
`models available for critical
`requirements.
`
`Olftarantlal
`E,,c,°sm
`
`
`Range and Beth Specifications
`
`"Tat.-nl
`Maximum Bulb
`'
`Ditfercmlai "F (cg
`Mlvstlble
`Size
`Temperature (2)
`Between Stages
`Each Smiley, Fixed
`Range (1)
`in mm)
`‘F ‘C
`Adjustable or Fixed
`Standard
`Close
`"F {'
`.375“
`140
`zxnasspoc I6
`5
`2.5
`—aoto+5n
`(9.5 x 1021
`(so)
`(1.1 to 3.9;
`(23)
`(1.4)
`(m to +10)
`375 x 5
`140
`2 to 7 as pacified
`3.5
`2
`20 to so
`(9.5 x 127)
`(50;
`(1.1 to 3.9}
`(1.9)
`“ (1.1)
`(-7 to +28)
`.375 x 6
`146 "
`2' ta‘ 7 as Specified
`3
`1.5"
`'‘4o‘‘'1o'‘'9o
`(9.5 x 152;
`(60)
`(1.1 to 3.91
`(1.7)
`(0.5)
`(5 to 30)
`.094 x 144
`140
`2 to if as Spaoilied
`3.5
`2
`30to 110
`(zaxassa)
`(so)
`(1.1roa.9)
`(1.9)
`(1.1)
`(M0413)
`{1} Olhoravalable ranges on quariltyoi-tiers are -2020 +6G'F{-«Qt; +186). -l U to-1-?‘(YF (—-2310 +z1'c), A0to12t3‘F(5lo 4§‘C}. 50 to 2D0'F tlotoslfcl.
`ea1n1ao'F(1s b5s'C1. ea1¢14o'F(15meo‘c) and 1omn2¢o‘F (40to 12176}.
`{2}Muxknu-nbubton°@a¢aArevt1ld1u'1oa&arrner1tcanwltl'standathkamervlmawakdxhgu~eEiuolmecmt:nl,mct1esshipplngu:rxfilass.THslLsrm
`fl'1ctnmp¢rzkuwhlc>hl1oou1trolcznwi!'w2arvGmrepoatcycios.
`cqsgptollsouahndbyuslrlgstyle1MmampouIboxfladdhgFTG§M~mCRpaddngn£ea:«nbh'lall?NPTtzpplng
`
`
`gun,
`Style
`
`for
`4
`TE"
`4;
`1'5“
`4
`9
`
`‘
`
`© 1988 Johnson Conlmis. inc.
`CodeNo. LIT-125130
`
`1
`
`

`
`
`
`Fig. 2 — interior view showing
`high temperature (stage)
`and low temperature
`(stage) switches.
`
`General Description
`
`Controls are compact with
`nonadjustable differential on
`each switch. Knob range
`adjustment and visible scale are
`standard. Models are available
`with a knob for field convertible
`adjustment. These models are
`supplied with a snap-in plug in
`the cover for concealed
`screwdriver slot adjustment,
`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 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 rn) in 2 foot (0.6 in)
`increments; over to 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 (121°C).
`
`Maximum liquid pressure limit is
`150 psig (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 Adjuster
`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, concealed
`screwdriver siot or external
`screwdriver slot adjustment.
`
`asuovs
`
`ADJUSTHENT
`
`
`
`Fig. 3 - Drawing showing
`snap-in plug removed and the
`knob in line to assemble. Press
`
`the knob onto the slotted shaft.
`
`Electrical Ratings
`
`A28AA——— Standard Differential
`zpggm
`120
`Vang AC
`9.2
`15.0
`Full Load Amp
` F*"”?6B 552
`'
`Resistance Load Amp
`(Not Larrp Loads)
`
`160
`
`9.2
`
`48.0
`" '
`
`A
`
`277
`—
`_ -
`
`‘
`
`7.2
`
`Pilot Duty —- 125 VA, 24/277 VAC
`NOTE: When used in a hrmcircuil midi. bu but connected load mustnot exceed 2000 VA.
`
` A284: -— Close Differential
`
`Volts, AC
`Fl.lLoadAmp
`Looked
`KY-E6
` ' or
`Rosistamce Load Arno
`(Nottzrrio Loads)
`
`Pilot Duty —- 125 VA. 24/277 VAC
`Noifizmunwodasamodrwitubdimwtaelcavnctedhedmutnmtxoeedmtxivk
`
`2 A28 Product Bulletin
`
`120
`6.0
`36.0
`10.0
`
`208
`3 4
`20:4
`92
`
`240
`18.0
`
`277
`
`W
`7.2
`
`~
`
`

`
`0;-dering mfg.-«magfon
`_
`T0 Order, SPGCWYI
`
`1. Type number (see Type
`Number Sehaction).
`
`2. Range required.
`
`3. Between-stage differentiai
`(nonadjustable modets
`only).
`
`4.
`
`5,
`
`capmary length, if other
`than 5 feet (13 m),
`
`Packing nut assembly or
`bulb weii, if required.
`
`»-
`
`o.
`
`Specify type of range
`adjustment if oiher than
`knob adjustment.
`
`‘
`Repasrs and Repiacement
`
`Field repairs must not be made.
`For a replacement control,
`contact the nearest Johnson
`Controls wholesaler.
`
`CUTOUT STD? BRACKET
`«mm smr AND SC?f-Iw
`
`
`
`as
`Fig’ 7 H Between
`differential can be increased b
`.
`.
`.
`3'
`rotatmg ad3ustmg cam
`ccumerclockwise
`as iltustrated above.
`
`Fig. 8 - The controls have a
`Scmw W99 °"t°"t ‘mp’ The
`stopscrewmustbeloosened
`.
`and moved to the stop settnng
`"°“’°‘;"eg::’g"‘i:'$a“‘;:“’ 3”"
`
`”8’.}L.8 SUPPORT "FUSE
`
`Fig. 4 - Styie 1 swaged bulb
`with support tube for clamp-on
`or closed tank appiications
`
`N1 ERLO€K:M’.;
`REYANER
`mcxmr; NUT wAsz--§$n\§‘ ! An.n:::
`
`
`Qwef.“ ‘
`.
`»
`.
`»
`«M3
`/ ““"
`.51,“ ‘
`~\ 1 *
`mama
`8”“ W990“
`W3‘
`
`
`
`{TEW’ FALL
`
`R7” 09345
`RBH CLOSES
`
`
`
`Fig. 5 - Part Number
`FTG13A-600R packing nut
`assembly. (Use with
`Styie 1 bulb with support tube
`for direct immersion
`applications.)
`
`3”5‘‘‘"‘3
`
`R13. CLOSES
`93»: QPENS
`
`an 43.0553
`99; OPENS
`
`
`
`,
`3é:?d:a6cé0§%;««:fis:L)
`‘.3}§’:'.i§i§8§‘3=.
`WELIBIM 805??
`
`.
`
`‘
`, .
`osmggcgn A
`§:§?x§.’»3§§
`23! I?!)
`
`RY OPENS
`15w Rzse -3 / Ra: cusses
`9'“ 35"“
`
`HI-'EMP L0-TEMP
`571165
`smsz
`
`_
`_
`_
`, "9 5 *' 3”!” W8“ *0? ‘W5
`‘"‘m“’3i°" 3PP“c3fi°“5 "hem 3
`temperature bulb may he
`removed without draining tank.
`
`Fig. 9 - Switching action of the two-stage contra! is illustrated
`in the sketch above. RB", RY” indicates HI-TEMP stage; REL, Rn indicates
`LCLTEMP stage. “D” represents the differential between stages.
`
`
`
`A28 Product Bufletin
`
`3
`
`

`
`
`
`JLAWER
`
`mu
`SUPPLY
`
`COMPRESSOR
`UNLOADCR C%Ul‘-
`
`°“’£§’i§‘ ‘=9
`
`}
`
`t CONHECY ms ma: 70 ® roe
`uuoaocx cmcun mu must as
`Eraaacrzzn to «mono cowkcssck.
`
`Fig. 10: Typical wiring diagram of a refrigeration compressor with single—stage unloader.
`Two compressor packages may be sequenced with the same circuit.
`
`.a
`asst: ;a.:;n‘"'{ '2'!‘ F‘
`.1.
`W
`4%
`
`T
`i
`
`T
`
`cArt1.LAn1 Lmurn A5 SPECIHEO
`
`
`{.41
`‘Hi
`
`3L
`E
`
`..L.
`
`samz
`
`IND3
`
`"9-%'«‘&‘ ~1-%°-a~—
`
`K
`3 ncgzs 3&1 om, .\
`
`u
`
`“mi
`E
`-
`2
`
`* “$7
`‘-29
`1
`32
`L362:
`
`T
`
`i
`an
`we“
`!
`
`'
`
`,
`
`{fii 1
`é
` §
`\\4L-2 vrouums wxzs Optional Haunting Bmci-tea
`"
`‘
`‘
`' ~ua~s2 mat»:
`in
`Ms
`Dimensions -~
`“""""""""“ 75:‘ '***~‘**3
`mm
`Performance specifications appearing herein are nominal and are subject to
`accepted manufacturing tolerances and application variables.
`
`CONTR S
`Contmts Group
`507 E. Michigan Street
`PO. Box 423
`Printed in USA.
`Miiwaukee, W! 53201
`
`4 A28 Product Bulletin
`
`’
`
`File No. E6688
`CSA Crass No. 4813 02
`Fiie LR948
`
`UL Guide No. XAPX
`
`

`
`125
`Master Catalog
`Temperature Controls Section A
`Product Bulletin A28
`issue Date
`1291
`
`NSON
`J
`CONT? S
`
` /
`
`
`
`Application
`
`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 temperatwe
`control applications in the
`refrigeration. air conditioning and
`hegfing fiems‘ .T.w° SPOT
`swxtches permit independent
`control circuits. Each switch may
`
`be wired for “open high“ or “close
`high" action as required, plO\lldll‘lg
`automatic changeover on heating-
`cooling or similar 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
`51399 d'fi9'em’a3'
`A" Series A23 temperature
`controls are designed for use
`on’), as operating contrms
`where an operating comm’.
`failure would result in personal
`
`A28 Series Two-Stage Temperature
`Controls Less Enclosure
`
`Specifi cations
`
`Type Numb“
`
`AZBGA
`A28GJ
`
`‘swhch
`
`Dmenmm
`Finish
`
`“amid
`
`smpptng
`“Mam
`
`Two SPOT Switches. Standard Ditlerential
`Two SPDT Switches. Close Differential
`SPOT. Snap-Acting Contacts in Dust
`Protected Enclosue
`
`Each Switch
`Between Stages
`
`-
`Fix-ad
`Adgustabla or Fixed. As Specified
`Zinc Plate
`
`Baseplate
`Frame
`Individual Pack
`
`0.063‘ (1.6 rrm) Cold Rolled Steel
`0.050‘ (1.3 rrm) Cold Rolled Stool
`0.8 lb (0.36 kg)
`
`°"°'P"°"
`40 Units
`Bulk Pack
`so Units
`
`3.: lb (15.4 kg)
`
`44 b (20 k 1
`9
`
`Electrical Ratings
`A28GA —- Standard Differential
`Volts, AC
`120
`Ft! Load Amp
`16.0
`1.00
`96.0
`R5§liEucnve Or
`Rofilanoo Load Amp’
`(Not Lamp Loads)
`
`208
`92
`55.2
`
`9.2
`
`16.0
`
`PdotDI.xty——125VA. 24 to277VAC
`'$P$TR¢thg.Totdoatucbdbndmutnoloxoood2000VA.
`
`240
`8.0
`48.0
`
`8.0
`
`2T7
`-
`—
`
`7.2
`
`AZBGJ —— Close Differential
`Vo|t_s‘, AC
`1 20
`208
`240
`.
`27?
`RI Load Nrp
`6.0
`3.4
`3.0
`-
`@123 W AW!) '
`36.0
`20.4
`18.0
`—
` ***———’*
`Resistance Load Amp’
`10.0
`9.2
`8.0
`7.2
`(Not Larrp Loads)
`
`Fig. 1 — The A28GA with
`calibrated dial and painter.
`
`injury and/or loss of property, it
`is the responsibility of the
`installer to add devices (safety,
`limit controls) or systems
`(alarm, supervisory systems)
`that protect against, or warn of,
`control failure.
`
`Features
`
`I Dependability - precision
`snap-acting contacts in a dust
`protected enclosure.
`
`0 Flexibility — wide choice of
`ranges, mounting and element
`styles.
`
`0 Precision repeat accuracy
`which is unaffected by
`barometric pressure and cross
`ambient problems.
`
`0 Special close differential
`models with case
`compensation of ambient
`temperatures available for
`critical requirements.
`
`24 K327?
`—— 1
`lo!
`'Tdiou'nododbadn1ustnotoxoeod20wVA
`
`
`© 1991 Johnson Controls, Inc.
`Code No. LIT-125125
`
`

`
`OPt;b“3l °9”5tl;UC1i%“ 31 extlgad
`cos , on quanti y or ers, inc u e:
`
`NTERLDCK INC
`mcxznc NUT §.§;‘H'2§§
`1/2" mi ADAPTER
`.
`.
`k A
`BK”
`
`gggxfiasimm
`WW5
`Tue:
`Fig. 3 .— Part Number FTG13A~60OR
`*=*°*;*~=::.*:..*=*°"‘*>*v-<:.’.s:**;*5=~*=
`1 mt:
`support tu
`or
`irect
`immersion application.)
`
`General Description
`These controls have a
`nonadjustable differential on each
`~
`switch. Available with 1/4 in. shaft
`1' Capmary ‘W98’ ma" 6 feet‘
`and choice of .156 in. or .187 in.
`2. Bulbs 3/16 in. (4.8 mm).
`fiat for knob mounting (knob not
`1/4 ‘”- (5-4 mm) °' 5'75 ‘“-
`::¢:‘;::2—::;r;:,°::l::.:“:,:W "9
`A
`quantity orders (see Optional
`3‘
`gfggggaiégggw m°"eme"t
`Constructions). Standard shaft
`'
`rotation is clockwise for warmer
`4.
`3/16 in. x 22 in. long bulb for
`‘::*;:;;1:at:‘:*:.?;::1e:“:la~.
`?:;:*:::%u‘,:i:;?::s:rs
`as f:°‘°;'g
`pointer.
`(20 to 90°F [.7 to +32°c}
`t
`_
`4
`C '6;
`‘Id d,
`I
`d
`.
`ra
`,
`Other features include a liquid-
`range mm’
`will factfary aadjfigtaglornrizrt
`““e_d» 9°PP9' 5*‘-‘“5’"9 element
`_
`field) low cutout or high
`:*’r:'::u’fe”a“:§f::::g :z’n:::t’“e""°
`cutout stops when specified
`H
`d
`F‘
`. 8 .
`/sum SUPPORT was
`temperature problems. Commls
`on Quan I Y or ers( lg
`)
`may be supplied for immersion 2: E
`I
`_ L
`t
`t
`applications for use with a closed
`r=;g_ 2 _ Styie 1 swaged bun;
`thzirnnssat {few fggegivucrjtout
`tank connector or with a bulb well
`with support tube for clamp-on or
`y
`0
`assembly’
`dosed mm app,§cw°m_
`slop 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)-
`
`
`
`A CAUTION: Do not dent or
`detorm the sensitive bulb of
`W5 °°“t’_°'* Ade” °'
`def,°"“§"’°” Wm °ha”9° "'9
`
`
`°a“b*3*'°" W Cause ‘he
`
`
`°°”"’°l 1° Cycle at 3
`‘e"'l'p°’a“”e '°‘”9’ ma“ the
`
`die setting.
`
`.
`.
`0911008! Constructions
`Sensing Elements
`
`3/8 in. (9.5 mm) diameter bulb
`and 6 ft (1.8 in) capillary are
`Slafldafd.
`
`0 .
`Ad.
`lustmem pmms
`Range adjustment changes cut~in
`and cutout points alike. Available
`with fixed or adjustable differential
`between stages. Adjustment
`options, on quantity orders, are:
`1-
`11/gall} (fgifglgm) Sglafl
`- mm 07 .
`in.
`.
`(4.75 mm) milledtlat for
`buyers’ knobs (Pg. 11).
`
`In.
`
`2.
`
`Screwdriver slot with stops,
`colder-wanner dial (Fig. 9).
`
`;
`
`i‘
`'-l~—~——A»-——~l
`
`BUSHWG
`\ 5“ "°”“"/"2' “PT “°“"E’*
`I
`354 l—-—'-
`omeusm "A'
`agape NUI-l_8_§R
`4.75021)
`wEu4:x—6ooRmoNEL)
`§;§§§‘}g§’,*
`‘;$§§‘,2§:§3§’,;
`2.51171)
`w£L1sA~sozR
`-«Fig. 4 -~ Bulb well for liquid
`immersion applications where a
`temperature bulb may be removed
`without draining tank.
`
`
`Flange, Differential and Bulb Specifications
`
`Dmaemlal E
`c‘
`
`.
`
`Bulb
`SW9
`(2,
`
`Bulb
`maximum Bulb
`Adjustable
`Size
`Temperaturefl)
`Range
`lg
`LE
`3°""-‘°" 3"?“
`.._