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ManualsBrandsCleveland Controls ManualsAir Pressure SwitchesAir Flow Pressure Sensing Switch (.1/10"W.C.)

Cleveland Controls

Division of UniControl Inc.

Cleveland Controls

DIVISION OF UNICONTROL INC.

1111 Brookpark Rd

Cleveland OH 44109

Tel: 216-398-0330

Fax: 216-398-8558

Email:saleshvac@unicontrolinc.com

Web page: http://www.clevelandcontrols.com

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Bulletin LTNS20000xx-04

GENERAL DESCRIPTION &

OPERATION

The NS2™ Switch has a glass-lled poly-

carbonate housing containing a sensing dia-

phragm and an integral snap-acting switch

with three male 90° quick-connect terminals.

The switch can be actuated by a pressure or

vacuum air ow or the differential between

two air ows. The eld adjustable set point

range of the switch is 0.10"w.c. to 10.0"w.c.

Using the switch accessories contained in

this kit, the NS2™ switch can be applied to

a wide variety of residential and light com-

mercial HVAC applications.

SET POINT RANGE &

ADJUSTMENT

Calibration requires a manometer (not

included in the kit) as well as the included

" hex wrench.

1. Establish the set point as follows. Refer-

ring to Table 2 in this manual, select the

appropriate spring for the required set point

range. Insert the spring into the center well

of the mounting pan (light gray side of the

switch housing).

2.Insert the black set point adjustment

screw, and rotate it manually until the

threads are engaged.

3. Connect the switch to a manometer. Us-

ing the

" hex wrench provided in the kit,

turn the adjustment screw in small incre-

ments until the desired set point is reached.

Turn the screw clockwise to increase the set

point or counterclockwise to decrease the

set point. For precise calibration, conrm

the set point at actual operating temperature

with a manometer. Following precise cali-

bration, if desired, seal the adjusting screw

using Three Bond #TB3015B UV curable

adhesive/sealant. Do not place the switch

in operation without knowing what the

set point is: doing so could create a

hazardous situation.

MOUNTING

Using the (2) #6-3/8 mounting screws in-

cluded in the kit, mount via the integral foot

bracket (see Fig. 1) or, via either of the op-

tional brackets (see Figs 4 & 5) included in

the kit. If using one of the optional brackets,

attach it to the switch with the self tapping

screw provided before mounting the switch.

Select a mounting location free from vibra-

tion. Mount with the diaphragm in any verti-

cal plane. Avoid mounting with the sample

line connections directed upward.

ELECTRICAL CONNECTIONS

The snap switch has three ¼" 90° male

quick connect terminals. Before pressure

is applied to the diaphragm, the switch

contacts are in the deactivated position as

shown in Figure 2.

AIR SAMPLING CONNECTION

Integral sample line connectors, located on

both sides of the diaphragm, accept

ID exible tubing. See Figure 3. The High

or Positive inlet (P1) is black and the Low

or Negative inlet (P2) is gray. Connect the

sample lines as follows:

Positive Pressure Only: Connect the

sample line to P1; P2 remains open to the

atmosphere.

Negative Pressure Only: Connect the

sample line to P2; P1 remains open to the

atmosphere.

Two Negative Samples: Connect higher

negative sample to P2; lower sample to

P1.

Two Positive Samples: Connect higher

positive sample to P1; lower sample to

P2.

One Positive and One Negative: Connect

positive sample to P1; connect negative

sample to P2.

USING A FLOW-

RESTRICTING ORIFICE

Some applcations require a delayed switch-

ing action after set point is reached. The

Field Adjustable Kits

NS2-0000-xx

™

FOR RESIDENTIAL & LIGHT COMMERCIAL HVAC APPLICATIONS

delay is created by inserting an orice plug

into either or both of the sample line con-

nectors to restrict air ow .

Eight orice plugs in four color-coded sizes

are included in the kit, as shown in

Table

3. Note that the measuring device and the

NS2™ air switch must both contain the

same size restricting orice in order to obtain

an accurate measurement of the set point.

More information is available in

Technical

Bulletin 030109-1.

TABLE 1: MODEL SELECTION

NS2-0000-00

Basic model

NS2-0000-01

Bleed hole in Mounting Pan

TABLE 2: SPRING SELECTION

Part No. Color Set Point Range ("wc)

61523 Black 0.10 thru 0.30

61513 Natural 0.30 thru 0.90

61514 Yellow 0.90 thru 2.50

61515 Red 2.50 thru 5.00

61524 Blue 5.00 thru 10.00

TABLE 3: ORIFICE SELECTION

Part No. Color Diameter

61518001 Green 0.010

61518002 Gray 0.016

61518003 Red 0.028

61518004 Blue 0.035

Summary of content (2 pages)

PAGE 1
Cleveland Controls Field Adjustable Kits Division of UniControl Inc. NS2-0000-xx ™ For Residential & Light Commercial HVAC Applications General Description & Operation The NS2™ Switch has a glass-filled polycarbonate housing containing a sensing diaphragm and an integral snap-acting switch with three male 90° quick-connect terminals. The switch can be actuated by a pressure or vacuum air flow or the differential between two air flows. The field adjustable set point range of the switch is 0.10"w.c.
PAGE 2
Fig. 1: Dimensions: NS2 Switch with integral connectors and mounting feet. Fig.2. Without pressure applied to the diaphragm, switch contacts are in the position shown. Fig. 3. Standard integral connector accepts 3/16" ID tubing. Fig. 1 Fig. 2 Fig. 3 NS2 Switch technical specifications Material Figure 4: Half Strap Bracket Body Glass-filled polycarbonate. Diaphragm Post-cured silicone. Terminals Copper alloy. Contacts Fine silver. Operation Operating Range 0.10″w.c to 10.0″w.c. Max.