Product Overview

SPECIFICATIONS
CLEVELAND CONTROLS
MODEL DFS-221-112 AIR
PRESSURE SENSING
SWITCH WITH
FIXED SET POINT
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:
0.02±0.01"w.c.
(0.5082±0.254 mm w.c.)
Measured Media: Air, or combustion by-
products 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 maxi-
mum rated electrical load.
Electrical Rating:
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°
quick-connect terminals.
Sample Line Connectors: Two barbed ¼"
slip-on connectors.
Sample Line Connections: Connectors
accept flexible tubing.
Approval: UL, FM, CSA.
Shipping Weight: 1.2 lbs.
Accessories
• Sample line probes.
• Orifice plugs (pulsation dampers).
(Figure 4)
(Figure 3) (Figure 2)
ELECTRICAL CONNECTIONS
(FIGURES 3 & 4)
Before pressure is applied to the diaphragm,
the switch contacts will be in the normally
closed (NC) position. Control and alarm
functions are wired as shown in Figure 4.
Nominal Dimensions in Inches (Millimeters)