Air Techniques 87176 Guía

Pressure Switch Replacement Kit

Part Number: 87176

Replacement & Adjustment

Instructions

Figure 2. AirStar Membrane Compressor Pressure Switch Location and Connection Configuration

Table 1.

Pressure Switch Configuration by Model and Serial Number

Notes:

AirStar models with serial numbers lower than

those listed have an unloader connected.

AirStar models with serial numbers the same or

higher than those listed do not have an unloader

connected and do not use the tubing.

This includes models AS12, AS40 & AS100.

Model Serial

No. Model Serial

No.

AS10 102716 AS30 316829

AS21 216147 AS50 512621

AS22 226244 AS70 706081

Introduction. This document provides the instructions to replace and adjust the Pressure Switch, part number 86436, used on

the AirStar membrane compressor product family using Pressure Switch Replacement Kit, P/N 87176. The switch controls the

compressor on (cut-in) and off (cut-out) cycling in response to system pressure level. It effectively keeps the system air pressure

within the rated operating range of 85 and 115 psi (5.8 and 7.9 bar). As shown by Figure 1, the parts supplied in the kit consist of

a Pressure Switch, P/N 86436 and a 10.25-inch length of 10mm Flamex Tubing, P/N 86726.

Flamex 10mm

Tubing

(1 piece, 10.25

inches long)

Pressure

Switch

AirStar AS50 Shown

Detail A - Current Design

Pressure Switch without an unloader

Membrane

Dryer

Pressure

Switch

Cooler

Pressure

Switch

Detail B - Original Design

Pressure Switch with unloader and extra hoses

Membrane

Dryer

Membrane

Dryer

Unloader with associated

connection hoses

Figure 1. Pressure Switch Replacement Kit, Supplied Parts

Item Description P/N

1. Pressure Switch

Assembly

86436

2. 10.25-inch, 10mm

Flamex Tubing

86726

www.airtechniques.com

DENTAL AIR SYSTEM

Air Techniques, Inc.

1295 Walt Whitman Road

Melville, New York, USA 11747- 3062

Unloader

Important Information. There are two pressure switch

connection configurations presently in the field; the original

design with an unloader connected and a newer one that

does not use an unloader. Replacement kit, P/N 87176, is

used to replace the pressure switch in both configurations

leaving the pressure switch installed without an unloader.

Table 1 lists the different configurations by model and

serial number. Figure 2 shows the pressure switch location

and connection configuration details. New AirStar models

including AS12, AS40 and AS100 do not have an unloader

and do not use the supplied Flamex tubing.

All personnel servicing the equipment must read and

understand the Installation and Operation Manual before

operating or performing any service of the unit. Only a

trained technician should perform any service.

CAUTION

Remove Power and Depressurize Tank

iNever work on equipment connected to live power. Remove power by disconnecting facility

power to the unit prior to performing any replacement procedures.

iPrior to performing the replacement procedures, make sure to depressurize the storage tank.

Caution: To avoid damage, do not exceed maximum allowable system pressure.

Always check the pressure switch operation after re-setting.

Pressure Adjustment

Adjusting the operating pressure range of the Pressure Switch is accomplished by the Range and Differential spring nuts located

under the pressure switch cover. The Range spring nut controls the cut-in or turn on pressure set point, while the Differential spring

nut sets the operation cut-out or turn off pressure set point. Since the range adjustment changes both the high and low operating

points, it is recommended to always adjust the Range spring nut first.

Adjustment Instructions

Set the switch pressure range by first removing the nut

securing the pressure switch cover and remove the

cover from the switch to access the adjustment spring

nuts. Refer to the Figure 4 and adjust the pressure

switch as follows:

Range – Adjust Range spring nut (A) until the

desired operating point (cut-in) of 85 psi (5.8 bar) on

falling pressure is obtained. Turning the Range nut (A)

clockwise will increase the setting.

Keep in mind the range adjustment changes both the

high and low operating points but should always be

adjusted for the low operating point.

Differential – Set the operating point (cut-out) on

rising pressure to maximum by adjusting the Differential

spring nut (B). Turning the nut (B) clockwise increases

the pressure difference between the high and low

operating points by increasing the high operating point

only.

Kit Replacement Procedure. Refer to Figures 2 through 4 and

replace the pressure switch by performing the following steps.

1. Use a Phillips head screwdriver to loosen the screw securing

the pressure switch cover and remove the cover.

2. Disconnect wires from the pressure switch. Tag if necessary.

3. Proceed to step 4 if no unloader is connected to the pressure

switch. If an unloader is connected perform the following:

a. Use a torx screwdriver to loosen the screw securing

the unloader to the pressure switch and remove the

unloader.

b. Remove the hoses connected between the Cooler

and Membrane Dryer. Discard the unloader and

associated hoses.

c. Replace the removed hose between the Cooler and

Membrane Dryer with the Flamex tubing supplied with

the kit.

4. Using a 15/16-inch open end wrench, loosen the pressure

switch by turning counter-clockwise. Remove and discard.

5. Install the replacement pressure switch and tighten by turning

clockwise using a 15/16-inch open end wrench.

6. Refer to Figure 4 and connect the wires to the pressure switch.

7. Turn on the compressor and check the pressure switch. Adjust

the switch by performing the Pressure Adjustment Procedures

below.

8. Install the cover onto the pressure switch and secure by

tightening the 5/16-inch acorn nut.

Figure 3. Pressure Switch Replacement

STEP 1

STEP 3.bSTEP 3.a STEP 3.c

Torx

Screw

Unloader Discard the unloader

and associated hoses.

Unloader

Flamex 10mm

Tubing

10.25 inches long

(1 piece)

STEPS 4 & 5 STEP 8

15/16-inch

Wrench

STEP 2

Figure 4.

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