Application
For low or line voltage control of static, velocity or total
pressures, or differential static or total pressures of air and
non-combustible gases only.
Specifications
Setpoint:
Factory Set, 0.07" (1.8 mm) W.C.
Field Adjustable, 0.07 to 1" (1.8 to 25.4 mm) W.C.
Sensing Element: Neoprene diaphragm.
Differential: 0.04" (1 mm) W.C. at minimum setpoint
(3 mm) W.C. at maximum setpoint.
Environment:
Ambient Temperature Limits,
Shipping, -40 to 140°F (-40 to 60°C).
Operating, 35 to 140°F (0 to 60°C).
Humidity, 5 to 95% R.H., non-condensing.
Locations, NEMA Type 1 indoor only.
Maximum Pressure: 12" (305 mm) W.C.
Electrical Switch: Snap action SPDT.
Ratings, See Table-1.
Connections, Code screw terminals
Case: All metal with 1/2" conduit opening.
Mounting: In vertical position on any surface free of
n.
vibratio
Dimensio
mm x 121 mm x 11
Accessories
AP-302 Static probe for turbulent air
AP-305 Static probe for low actuating pressure
AT-208 Duct mtg. kit for remote probes other than
ns: 5-1/8" high x 4-3/4" wide x 4-3/8" deep (130
1 mm).
AP-302 or
AP-305
to 0.1"
Pre-Installation
Inspection
Visually inspect the carton for damage. If damaged, notify the
appropriate carrier immediately. Visually inspect the device
for obvious damage due to shipping. Return damaged parts
to place of purchase.
Required Installation Items
• Wiring or piping diagrams
• Appropriate screwdrivers (not provided) for mounting
screws (provided)
• Conduit fittings (not provided)
PC-301
Differential Pressure Switch
General Instructions
Installation
Caution:
1. Installer must be a qualified, experienced technician.
2. Disconnect power supply before installation to prevent
electrical shock.
3. Make all connections in accordance with the wiring
diagram, and in accordance with national and local
electrical codes. Use copper conductors only.
4. Avoid locations where excessive moisture, corrosive
fumes or vibrations are pre
intended for indoor use primarily to provide a degree of
protection against contact with the enclosed equipment.
5. For use with air or non-combustible gases only.
Table-1 Maximum Electrical Switch Ratings
Full Load
Vac
24V -- -- 60 --
120V 6.25 37.5 300 --
240V 3.1 18.6 300 --
277V 2.7 16.2 300 10
Amps
Locked
Rotor Amps
sent. NEMA 1 devices are
Pilot Duty
(VA)
Non-Inductiv
e
Amps
Printed in U.S.A. 5/10 © Copyright 2010 Schneider Electric All Rights Reserved. F-16160-9
6. Make all connections in accordance with job wiring
diagrams and in compliance with national and local
codes. On an increase of air pressure to above setpoint,
common contact of switch is made to normally open
contact. On a decrease of air pressure to below setpoint,
common contact of switch is made to normally closed
contact.
Table-2 Direct Mount of One Probe.
Static Veloc ity Total Δ Static Δ Total
High Pres.
Ta p*
Low Pres.
p
Ta
Probe 1 Probe 2 P
Probe 3
-Remote
robe 2 Probe 1 Probe 2
Pr
--
obe 3
Remote
Table-3 Remote Mounting of Probe(s).
Static Velo city** To tal Δ Static Δ Total
High Pres.
Tap*
Low Pres.
Ta p
* Highest (absolute) pressure should be applied to high pressure tap.
**Pilot can be used instead of two probes
Probe 3 Probe 4 Pro
-- Probe 3 -- Probe 3 Probe 4
be 4 Probe 3 Probe 4
Δ = Differential
Probe 4
Remote
Figure-6 Part Identification.
Adjustment
To increase setpoint, turn adjustment screw clockwise.
Adjustable 0.07" ±0.02" to 1.0" (1.78 mm ±0.5 mm to 25 mm)
W.C. To decrease setpoint, turn adjustment screw
counterclockwise.
Note: Units are shipped at minimum setpoint.
If readjustment to minimum setpoint is required, proceed as
follows without any air pressure applied to diaphragm.
1. Turn adjustment screw full CCW.
2. Push on spring at point A (Figure 6) and maintain
pressure during step
3. Turn adjustment screw CW until common contact is made
rmally open contact.
to no
4. Turn adjustment screw CCW until common is made to
normally closed contact. Then turn adjustment screw 1/8
turn more CCW.
s 3 and 4.
F-16160-9 © Copyright 2010 Schneider Electric All Rights Reserved. 3
On Octo be r 1st, 200 9, TAC became the Buildings bu sine ss of its pa ren t comp any Schn eid er Ele c tric. This docu ment refl ects the vi sual ide nt ity of Schnei d er El ec tr ic,
however t her e rema ins references to TAC as a corporate bra nd in the body c opy. As each document i s up dated, t he body copy wil l be change d to reflect app ropr iat e
corpora te b rand chan
g
Copyright 2010, Schneider Electric
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-16160-9
es.
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