Cleveland Control AFS-222-112 Eng - SES Combustion AB

APPLICATIONCleveland ControlsDivision of UniControl Inc.Model AFS-222-112 Air Pressure SensingSwitch is a general purpose provingswitch designed for HVAC and EnergyManagement applications. It may be usedto sense positive, negative, or differentialair pressure. The AFS-222-112 isequipped with convenient barbed sampleline connectors that accept flexible tubing.GENERAL DESCRIPTION &OPERATIONModelAFS–222–112AIR PRESSURE SENSING SWITCH WITH ADJUSTABLE SET POINT RANGEThe plated housing contains a diaphragm,a calibration spring and a snap-actingSPDT switch.The barbed sample line connectionslocated on each side of the diaphragmaccept flexible tubing.An enclosure cover guards against accidentalcontact with the live switch terminalscrews and the set point adjustingscrew. The enclosure cover will accept a½" conduit connection.MOUNTING (SEE FIGURE 1)Select a mounting location which is freefrom vibration. The AFS-222-112 must bemounted with the diaphragm in any verticalplane in order to obtain the lowestspecified operating set point. Avoidmounting with the sample line connectionsin the "up" position. Surface mountvia the two 3/16" diameter holes in the(Figure 1)AIR SAMPLING CONNECTION(SEE FIGURE 2)integral mounting bracket. The mountingholes are 3-7/8" apart.The AFS-222-112 is designed to acceptflexible tubing by means of barbed 1/4"slip-on connections. For sample lines ofup to 10 feet, ¼” OD tubing is acceptable.For lines up to 20 feet, use ¼” ID tubing.For lines up to 60 feet, use ½” ID tubing.Locate the sampling probe a minimum of1.5 duct diameters downstream from theair source. Install the sampling probe asclose to the center of the airstream aspossible. Refer to Figure 2 to identify thehigh pressure inlet (H) and the low pressureinlet (L). Connect the sample linesas follows:POSITIVE PRESSURE ONLY: Connectthe sample line to inlet H; inlet L remainsopen to the atmosphere.NEGATIVE PRESSURE ONLY: Connectthe sample line to inlet L; inlet H remainsopen to the atmosphere.TWO NEGATIVE SAMPLES: Connect thehigher negative sample to inlet L. Connectthe lower negative sample to inlet H.TWO POSITIVE SAMPLES: Connect thehigher positive sample to inlet H. Connectthe lower positive sample to inlet L.ONE POSITIVE AND ONE NEGATIVESAMPLE: Connect the positive sample toinlet H. Connect the negative sample toinlet L.Bulletin AFS222-112.01Cleveland ControlsDIVISION OF UNICONTROL INC.1111 Brookpark RdCleveland OH 44109Tel: 216-398-0330Fax: 216-398-8558Email:saleshvac@unicontrolinc.comWeb page: http://www.clevelandcontrols.comAre youreading a FAX or aCOPY of this bulletin?DOWNLOAD the fullcolorPDF version of thisand other literature atour website!

(Figure 2)(Figure 3)(Figure 4)ELECTRICALCONNECTIONS (SEEFIGURE 3)Before pressure is applied to the diaphragm,the switch contacts will be in thenormally closed (NC) position. The snapswitch has screw top terminals with cupwashers. Wire alarm and control applicationsas shown in Figure 4.FIELD ADJUSTMENTThe adjustment range of an AFS-222-112Air Switch is 0.05 ±.02" w.c. to 12.0" w.c.To adjust the set point, t urn the adjustingscrew counterclockwise until motionhas stopped. Next, turn the adjustingscrew 4 complete turns in a clockwisedirection to engage the spring. From thispoint, the next ten turns will be used forthe actual calibration. Each full turn representsapproximately 1.2" w.c.Please note: To properly calibrate an airswitch, a digital manometer or other measuringdevice should be used to confirmthe actual set point.SPECIFICATIONSMODEL AFS-222-112 AIRPRESSURE SENSINGSWITCH WITHADJUSTABLE SET POINTRANGEMounting Position: Mount with thediaphragm in any vertical plane.Set Point Range: 0.05 ± 0.02" w.c. to12.0"w.c.Field Adjustable “Operate Range”:0.07"w.c. to 12.0" w.c.Field Adjustable “Release Range”:0.04"w.c. to 11.2" w.c.Approximate Switching Differential:Progressive, increasing from 0.02 ±0.01"w.c. at minimum set point toapproximately 0.8 " w.c. at maximumset point.Measured Media: Air, or combustionby-products that will not degradesilicone.Maximum Pressure: ½ psi (0.03 bar).Operating Temperature Range:-40F to 180F (-40 to 82C).Life: 100,000 cycles minimum at 1/2psi maximum pressure each cycle andat maximum rated electrical load.Electrical Rating:300 VA pilot duty at 115 to 277 VAC,15 amps noninductive to 277 VAC, 60Hz.Contact Arrangement: SPDT.Electrical Connections: Screw-typeterminals with cup washers.Conduit Opening: 7/8" diameteropening accepts ½" conduit.Sample Line Connectors: Twobarbed ¼" connectors will acceptflexible tubing.Sample Line Connections: Twobarbed ¼" connectors will acceptflexible tubing.Approval: UL, FM, CSA, CEShipping Weight: 1.2 lbs.Accessories:• Sample line probes.• Orifice plugs (pulsation dampers).Nominal Dimensions in Inches (Millimeters)