NEW!
PRESSURE
FIXED DIFFERENTIAL PRESSURE SWITCH
DFS-221
PSI
DESCRIPTION
The Cleveland Controls Model DFS-221 Fixed Differential
Pressure Switch is an airflow proving switch designed for
duct heater, oven, and other HVAC and energy management
applications. The unit senses positive, negative, or differential
pressure with SPDT switch actuation on pressure rise at 0.05
WC, ±0.02 WC. The model DFS-221 is equipped with two
barbed sample line connections for use with ID flexible tubing.
Electrical connections are made via male quick connect
terminals for easy installation.
C
FM
US
APPROVED
FEATURES
•
•
•
•
Fixed set point at 0.05 W.C. (12.5 Pa)
Prove excessive or insufficient pressure
Quick connect terminals
15A, SPDT switch
DFS-221
SPECIFICATIONS
Contact Rating
Contact Type
Setpoints
Differential
Overpressure
Life Expectancy
DIMENSIONS
Operating Temperature-40° to 180°F (-40° to 82°C)
Mounting
Diaphram in vertical plane to obtain
operating set point
Process Connection Barbed fittings for 1/4" ID flexible
tubing
Wiring Terminations Male quick connect terminals
Approvals CE, CSA, FM, UL Recognized
File MH6213
Weight
1.2 lbs (0.5 kg)
Warranty
2 years
PRESSURE
15A resistive to 277 VAC, 60 Hz
300 VA pilot duty @ 115-270 VAC
15A resistive to 277 VAC, 60 Hz
300 VA pilot duty @ 115-270 VAC
SPDT
Fixed, 0.05" W.C. (12.5 Pa), ±0.02"
W.C.
0.02" W.C., ±0.01" W.C.
0.5 psi (3.5 kPa bar)
100,000 cycles minimum @ 0.5 psi
maximum each cycle and maximum
rated load
WIRING
3.25 (8.2)
1.63
(4.1)
0.44
(1.1)
2.94 (7.4)
1.38
(3.5)
To prove excessive air flow or pressure:
COM
NO
Alarm
NC
Normal
C
N.C.
0.19 (5)
dia hole
(2 places)
N.O.
2.84
(7.1)
6.12
(15.6)
18
To prove insufficient air flow or pressure:
Low
pressure
inlet
High
pressure
inlet
1.94 (4.9)
3.88 (9.8)
4.38 (11.1)
0.78
(1.9)
NO
Normal
NC
Alarm
C
0.71
(1.8)
ORDERING INFORMATION
MODEL
DFS-221
March 2014
DESCRIPTION
Fixed differential pressure switch, 0.05" W.C. (12.5 Pa)
WE MAKE IT EASY.
kele.com
888-397-5353 USA
1079