Hays Cleveland Air Flow Switch .05-.25
Model DFS–221–112 is an airflow proving
switch designed for duct heater, oven, and
other HVAC or Energy Management applications
where an open-mounted, nonadjustable
switch is desirable. It is especially
suitable for surface-mounting in areas where
internal access is limited. It can be used to
sense positive, negative, or differential air
pressure. The DFS–221–112 is equipped
with a convenient barbed sample line connector
that accepts flexible tubing.
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Quick Order Number: 172
Manufacturer: Hays/Cleveland Controls
Part Number: DFS-221-112
Weight: 1.25 lbs
Stocked Item*: Yes
Quantity Available*: 1
* If an order is placed where the item is a "Non-Stocked Item" or the quantity ordered is more than the quantity available, all items in stock will be shipped and the remainder of the items will be shipped as soon as we get the "backordered" items in.
Mounting Position: Mount with the
diaphragm in any vertical plane to obtain
specified operating set point.
Set Point: Fixed to operate on pressure rise
at 0.05±0.02"w.c. (1.27±0.508 mm).
Approximate Switching Differential:
(0.5082±0.254 mm w.c.)
Measured Media: Air, or combustion byproducts
that will not degrade silicone.
Maximum Pressure: ½ psi (0.03 bar).
Operating Temperature Range:
-40F to 180F (-40 to 82C).
Life: 100,000 cycles minimum at 1/2 psi
maximum pressure each cycle and at maximum
rated electrical load.
300 VA pilot duty at 115 to 277 VAC,
15 amps noninductive to 277 VAC, 60 Hz.
Contact Arrangement: SPDT.
Electrical Connections: Male ¼" 90°
Sample Line Connectors: Two barbed ¼"
Sample Line Connections: Connectors
accept flexible tubing.
Approval: UL, FM, CSA.
Shipping Weight: 1.2 lbs.