Cleveland ControlsDivision of UniControl Inc.

Cleveland Controls Division of UniControl inC. 1111 Brookpark Rd Cleveland OH 44109

tel: 216-398-0330fax: 216-398-8558

Email:saleshvac@unicontrolinc.comWeb page: http://www.clevelandcontrols.com

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Bulletin LITNS2.11

APPLICAtIONseries ns2™ Air flow Pressure sens-ing switches are designed with sturdy, contaminant-free construction, to provide low cost, high accuracy and reliability. ns2 switches offer a narrow switching dif-ferential and low set point tolerance over a wide operating temperature and set point range. they can be used to sense positive, negative or differential air pressure. factory-calibrated set points are available from 0.05″ to 10.0″w.c.

The glass-filled polycarbonate body of the switch provides a high degree of stability and accommodates many sample line con-nector options. the high and low pressure ports are color-coded for ease of identifica-tion. Port, bracket, and terminal orientations can be specified. The integral snap-acting switch mechanism (patent pending) is avail-able in sPno, sPnC, and sPDt terminal configurations.

An optional bleed hole is available, as well as numerous standard and cus-tom mounting brackets. Please consult Cleveland Controls about the many custom features we offer.

GeNeRAL DesCRIPtION & OPeRAtIONthe glass-filled polycarbonate housing contains a sensing diaphragm and includes an integral snap-acting switch. sample line connectors are located on either or both sides of the diaphragm to accept air sample connections.

the electrical connection consists of male 90° quick-connect terminals.the snap action switch can be actuated by a pres-sure or vacuum air flow, or by a pressure or vacuum differential.

MOUNtINGvarious mounting brackets are available. figure 1 shows two typical styles. select a mounting location free from vibration. Mount with the diaphragm vertical, or at a custom angle. specify the mounting position when ordering. Avoid mounting with the sample line connections directed upward.

eLeCtRICAL CONNeCtIONsthe snap switch has 90° male quick con-nect terminals in 1/4" (standard) or 3/16" (optional) sizes. Before pressure is applied to the diaphragm, the switch contacts will be in the deactivated position as shown in figure 2.

AIR sAMPLING CONNeCtIONseries Ns2 switches are available with many different types of sample line connec-tions that accept a wide range of flexible and rigid sample line tubing. see figure 3.

series

Ns2™

OeM AIR PRessURe seNsING sWItCHes WItH FIXeD set POINt

AIR sAMPLING MetHODthe High or Positive inlet (P1) is black and the low or negative inlet (P2) is gray. Con-nect 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.

Bulletin ns2.11

t e c h n i c a l s p e c i f i c a t i o n s

Material

Body Glass-filled polycarbonate.

Diaphragm Post-cured silicone.

terminals Copper alloy.

Contacts standard: fine silver. Optional: gold alloy.

Operation

operating range 0.05″w.c to 10.0″w.c.

Max. Pressure rating 14″w.c.

Mountingstandard diaphragm:

vertical or custom angle.Consult factory.

operating temperature

-40 to +88C. (-40 to +190f).

sample line Connections

Black positive. Gray negative.

Many configurations are available.

sample Medium

Air and byproducts of com-bustion that will not degrade

silicone or polycarbonate.

Product life 100,000 cycles minimum.

electrical

Electricalrating

standard silver Contacts:

sPDt, sPst electrical load: 1/10 HP @120 to 277 vac;28 vA pilot duty @ 24 vac;

125 vA pilot duty @ 120 vac.

sPst electrical load:5 Amps resistive @ 24,

120 to 277 vac.

Optional Gold Contacts:.15 Amp resistive @ 24vac or vdc.

ContactArrangement sPno, sPnC, sPDt.

Electrical Connectors

standard quick-connect terminals:

¼″ x 0.032 . Optional quick-connect

terminals: ³/16″ x 0.032.

General

Approvals Ul, CUl, CsA, CE,Australian Gas Assoc.

Accessories Consult factory.

A B

Fig. 2 Without pressure applied to the diaphragm, switch contacts are in the position shown.

Figure 3: Sample Line Connector Options: (A) Integral connectors; (B) Adapters

Figure 1A: Half Strap Bracket

Figure 1B: "L" Bracket Figure 1C: Standard Integral Bracket

64 ESPCOMPANY.COM | (937) 898-0391 ESPCOMPANY.COM | (937) 898-0391 65

CLEVELAND CONTROLS AIR PRESSURE SENSING SWITCH KITSeries RSS-495-11 Air Sensing Switch Kit contains compact, economical switches designed for a residential furnace and light commercial aftermarket applications. The RSS-495 switches have an adjustable set point range of 0.25” W.C. to 1.0” W.C. (they have been factory set to activate on a pressure rise of 0.25” W.C.). The field adjustability makes these switches ideal for aftermarket residential furnace applications, electronic air cleaners and humidifiers

Adjustable range: 0.25 + 0.05” W.C. to 1.0 + 0.05” W.C. Operating temperature range: -40°F to 190°F Approvals: UL, CSA, CE, NRTL, AUST. GAS ASSOC>

RSS-495-11

CLEVELAND CONTROLS AIR PRESSURE SENSING SWITCH KITSeries RSS-498-13 Air Sensing Switch Kit contains compact, economical switches designed for residential furnace and light commercial aftermarket applications. The RSS-498 switches have an adjustable set point range of 1.0” W.C. to 4.0” W.C. (They have been factory set to activate on a pressure rise of 1.0” W.C.) The field adjustability makes these switches ideal for aftermarket residential furnace applications, electronic air cleaners and humidifiers

Adjustable range: 1.0 + 0.05” W.C. to 4.0 + 0.05” W.C. Operating temperature range: -40° F to 180° F Approvals: UL, CSA, CE, NRTL, AUST. GAS ASSOC.

RSS-498-13

SERIES RSS SWITCHES

SERIES RSS SWITCHES

CLEVELAND CONTROLS AIR PRESSURE SENSING SWITCH WITH MANUAL RESETThe model AFS-460 is a general purpose proving switch designed to require manual opera-tor reset following activation. It can be used to sense positive, negative, or differential air pressure in HVAC and Energy Management applications that require operator interface. Installation kit included

Set point range: 0.40 + 0.06” W.C. to 12.0” W.C. Operating temperature range: -40°F to 180°F Approvals: UL, CSA

AFS-460-121

CLEVELAND CONTROLS AIR PRESSURE SENSING SWITCHThe NS2 series, Universal Small Footprint Air Switch, replaces hundreds of other small footprint exact replacement air switches today. Five separate springs cover ranges from .05”WC to 10”WC. Set screw adjustment with allen wrench included. Eight different orifice restrictors to set different time delays, and comes with two brackets for all applications

NS2-0000-03

AIR SWITCHES

SERIES AFS SWITCHES

AIR SWITCHES