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Cleveland Controls
Division of UniControl Inc.
Adjustable Set Point Air Pressure Sensing Switch with 8-second Time Delay
AFS-952 in Standard Enclosure,
rated NEMA-1.
Description & Operation
The Cleveland Controls AFS-952
Differential Pressure Sensing
Switch is designed to provide precise
operation and convenient features for
industrial and commercial air han-
dling applications. The AFS-952 can
monitor positive, negative, or differ-
ential pressure (flow) of air and non-
combustible gases, and is commonly
used to monitor combustion air, fur-
nace pressure, ventilating blower op-
eration, inflatable structure pressure,
fume hood operation, bag house air
flow, dirt accumulation in air filters,
and heat-transfer air flow. The AFS-
952 has a field–adjustable set point
range of 0.05"wc to 12.0"wc with an
8-second (± 3 seconds) time delay
relay sequence. The time delay pre-
vents nuisance shutdowns due to nor-
mal draft fluctuations.
AFS-952-1 in NEMA-4 rated
Enclosure.
Common Applications
The most common specific applica-
tion for the AFS-952 is as a Low
Draft (Negative Pressure) Cutoff
Safety Switch for combustion draft
control systems.
The general applications of the AFS-
952 are:
• Low Positive Pressure Cutoff.
(Shutdown upon insufficient pres-
sure.)
• Low Negative Pressure Cutoff.
(Shutdown upon insufficient draft.)
• Low Differential Pressure Cutoff.
(Shutdown upon insufficient differ-
ence between two samples.)
Model
AFS–952
AFS-952-2 in NEMA-7 and
NEMA-9 rated Enclosure.
Mounting
The AFS-952 is available in 3 enclo-
sures designed for surface mounting
on any flat, relatively stable surface
free of vibration. To obtain the low-
est operating set point specification,
the control must be mounted with the
diaphragm vertical (Fig 1).
The standard enclosure has mounting
flanges with four 9/32" mounting
holes as shown on page 3. The
NEMA-4 rated model has mounting
flanges with four 5/16" mounting
holes as shown on page 4. The
NEMA-7/NEMA-9 rated enclosure
has two mounting slots as shown on
page 4.
Bulletin AFS952.01
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Related Manuals for UniControl Cleveland Controls AFS-952
Summary of Contents for UniControl Cleveland Controls AFS-952
- Page 1 AFS-952 in Standard Enclosure, rated NEMA-1. Description & Operation Common Applications Mounting The Cleveland Controls AFS-952 The most common specific applica- The AFS-952 is available in 3 enclo- Differential Pressure Sensing tion for the AFS-952 is as a Low sures designed for surface mounting...
- Page 2 Sequence of Operation Model AFS-952 Air Pressure Sensing Switch Before pressure and power are applied to the AFS-952, the SPDT switch con- Mounting Position: Mount with the tacts are in the normally closed posi- diaphragm in any vertical plane. tion as shown in Figure 3 (“shelf” con- Set Point Range: 0.05 ±...
- Page 3 3.59" 5.25" (91 mm) (133 mm) K - 1 Load Relay CLEVELAND CONTROLS DIVISION OF UNICONTROL INC. MODEL AFS-952-B High Pressure Inlet Remove Plug Button to Adjust Turn Clockwise to Increase ¼ NPT Operating Set Point. TD -1 Signal...
- Page 4 ENCLOSURE SPECIFICATIONS & DIMENSIONS Model AFS-952-1: 14-gauge grey hammertone enameled steel with neoprene gasketed clamped cover hinged on the left side. NEMA 4 rated: provides protection 6.00" (152 mm) from dust, dirt, oil, and water. Shipping Weight: 8 lbs. 4.00" 1.00"...