HomeMy WebLinkAboutAir Pressure Switch Cleveland Controls Model
Division of UniControl Inc.
AFS -222
Air Pressure Sensing Switch with Adjustable Set Point Range
Application 3.Z5(8Z) 3.25[82)
1.fi3(41 1.36(34�
The Model AFS-222 is a general pur- .44('11)
pose proving switch designed for
HVAC and Energy Management ap- �,
plications. It may be used to sense d?
positive, negative, or differential air � �
pressure. � ----- -- ------�----- -- -
N
CD
General Description &
Operation
The plated housing contains a dia- LbwPres&ure
Inlet
phragm, a calibration spring and a 1.94(49);
snap-acting SPDT switch.The sample .19(4� High Pressure
connections located on each side of dia.hule a.as�es� Inlel
the diaphragm accept '/4" OD mOtal- Dimensions in Inches ,7S��g} 'H .71 (1S}
lic tubing via the integral compres- (Miv�n,eters)
sion ferrule and nut. must be mounted with the diaphragm a minimum of l.5 duct diameters
An enclosure cover guards �n any vertical plane in order to ob- downstream from the air source. In-
against accidental contact with the tain the lowest specified operating set stall the sampling probe as close to
live switch terminal screws and the point. Avoid mounting with the the center of the airstream as possible.
set point adjusting screw. The enclo- sample line connections in the "up" Refer to Figure 2 to identify the high
sure cover will accept a '/z" conduit position. Surface mount via the two pressure inlet (H) and the low pres-
connection. 3/�6" diameter holes in the integral sure inlet (L). Select one of the five
mounting bracket. The mounting application options listed below (on
holes are 3-'/s" apart. page 2), and connect the sample lines
Mounting (see Figure 1)
as recommended.
Select a mounting location which is Air Sampling Connection
free from vibration. The AFS-222 �see Figure 2)
(Figure 1) The AFS-222 is designed to accept (Figure 2)
� firm-wall sample lines of'/4" OD tub-
ing by means of ferrule and nut com- O
pression connections. For sainple �NLET H INLET L:
lines of up to 10 feet, Y4" OD tubing Positive only negative only
is acceptable. For lines up to 20 feet, �ower negative � � higher negative
higher positive lower positive
use '/4" ID tubing. For lines up to 60
feet, use '/z" ID tubing. A '/4" OD
00 � adapter, suitable for slip-on flexible
tubing is available: arder part num-
ber 18311.Locate the sampling probe
— Distributed by:
� Cleveland Controls
Division of UniControl Inc.
I I I I Brookpark Road • Clevcland OH 44109
Tel: (216)398-0330 • Fax: (216)398-8558
Bulletin AFS222.05 1
(Figure 3) TWO POSITIVE SAMPLES: Con- SpeClflCatlolls
nect the higher positive sample to in-
let H. Connect the lower positive
0 °� sample to inlet L. Model AFS-222 Air Flow Switch
- - - ) ONE POSITIVE AND ONE NEGA- Mounting Position: Mount with the
HIGH LOW d � TIVE SAMPLE: Connect the posi- diaphragm in any vertical plane.
N.C.N.O.
tive sample to inlet H. Connect the Set Point Range: 0.05±0.02"w.c.to
PRESSURE PRESSURE 12.0"w.c.
negative sample to inlet L. Field Adjustable "Operate Range":
0.07"w.c.to 12.0"w.c.
Electrical Connections (see Field Adjustable "Release Range":
Figure 3) 0.04"w.c.to 11.2"w.c.
Approximate Switching Differential:
(Figure 4) Before pressure is applied to the dia- Progressive,increasing from 0.02±0.01
phragm, the switch contacts will be "w.c.at minimum set pointto approxi-
in the normally closed (NC) posi- mately0.8°w.c.atmaximumsetpoint.
To prove excessive air flow or pressure: tion.The snap switch has screw top Measured Media: Air,or combustion
�. �� Alarm terminals with cup washers. Wire by-productsthatwillnotdegradesilicon.
��—'Gontr0l alarm and control applications as Maximum Pressure: 'hpsi
NC
shown in Figure 4. (0.03 bar)
o prove insufficient air flow or pressure: Operating Temperature Range:
�. ��,�Control -40F to 180F(-40 to 82C)
Field Adjustment
"° 'Alarm Life: 100,000 cycles minimum at 1l2 psi
The adjustment range of an AFS-222 maximum pressure each cycle and at
Air Switch is 0.05 �.02"w.c.to 12.0" maximum rated electrical load.
w.c.. To adjust the set point, t urn the Electrical Rating:
POSITiVE PRESSURE ONLY: adjusting screw counterclockwise un- 300 VA pilot duty at 115 to 277 VAC,
Connect the sample line to inlet H; til motion has stopped. Next,turn the 15 amps noninductive to 277 VAC,
inlet L remains open to the atmo- adjusting screw 4 complete turns in 60 Hz.
sphere. a clocicwise direction to engage the Contact Arrangement: SPDT
NEGATiVE PRESSURE ONLY• spring. From this point, the next ten Electrical Connections: Screw-type
' turns will be used for the actual cali- terminals with cup washers.
Connect the sample line to inlet L; bration. Each full turn represents Conduit Opening: �/a"diameter
inlet H remains open to the atmo- approximately 1.2" w.c. openingaccepts'/2'conduit.
sphere. Sample Line Connectors: Male,
Please note: To properly cali- ' externally threaded�/�s" 24 UNS 2A
TWO NEGATIVE SAMPLES: brate an air switch a di ital manom-
Connect the higher negative sample ° g thread,complete with nuts and self-
eter or other measuring device should aligning ferrules.
to inlet L. Connect the lower nega- be used to confirm the actual set Sample Line Connections: Connec-
tive sample to inlet H. point. � tors will accept'/4'OD rigid or semi-rigid
tubing.
Approval: UL, FM, CSA
Shipping Weight: 1.2 Ibs.
Accessories
Location of Sample Lines for Typical Applications • PIN 18311 Slip-on Yd'OD Tubing Adapter,
suitable for slipping on flexible plastic
FAN OPERATION OR TRUE AIR FLOW WITN FAN OPERATION OR PROVE POSITIVE tubing. • Sample line probes. • Orifice plugs
LITTLE OR NO STATIC PRESSURE. AIR FLOW WITH NO STATIC PRESSURE
STATIC PRESSURE. (pUISetI0f1 delTlp01'S).
O —' O � O � Pressure Conversion Table
PROBE MUST BE PERPENDICULAR TO FLOW. ���HZO=0.0361 Ibs./sq.in.or 0.0735 in.mercury
1"Hg.=0.491 Ibs./sq.in.or 13.6 in.water
FAN OPERATION AND TRUE AIR FLOW SUCTION OR FAN OPERATION NEGATIVE PRESSURE 1 psi=27.7 in.water or 2.036 in.mercury
WITH VARYING AMOUN S OF STATIC INCREASES AS FIITER
PRESSURE. GETS DIRTY.
� �� � � AFS-222 Sensing Switches are manufactured
� by Cleveland Controls Div.of UniControl Inc.
PROBE MUST BE PERPENDICULAR TO fLOW. FILTER
Bulletin AFS222.05