Air Techniques 87176 Replacement Instructions

DENTAL AIR SYSTEM
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.
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.
Cooler
Pressure
Switch
AirStar AS50 Shown
Figure 2. AirStar Membrane Compressor Pressure Switch Location and Connection Configuration
CAUTION
Remove Power and Depressurize Tank
Never work on equipment connected to live power. Remove power by disconnecting facility
i
power to the unit prior to performing any replacement procedures.
Prior to performing the replacement procedures, make sure to depressurize the storage tank.
i
Membrane
Dryer
Unloader
Unloader with associated
connection hoses
w w w. a i r te chn iques.c om
Air Techniques, Inc.
1295 Walt Whitman Road
Melville, New York, USA 11747- 3062
Pressure Switch Replacement Kit
Part Number: 87176
Replacement & Adjustment
In s tr u ct i on s
1
2
Figure 1. Pressure Switch Replacement Kit, Supplied Parts
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.
Pressure
Switch
Flamex 10mm
Tubing
(1 piece, 10.25
inches long)
Pressure Switch without an unloader
Pressure
Switch
Pressure Switch with unloader and extra hoses
Item Description
1. Pressure Switch
Assembly
2. 10.25-inch, 10mm
Flamex Tubing
Table 1.
Model
AS10
AS21
AS22
Detail A - Current Design
Detail B - Original Design
© Air Techniques, Inc Copyright 2012
P/N
86436
86726
Serial Serial
Model
No. No.
102716 AS30 316829
216147 AS50 512621
226244 AS70 706081
Membrane
Dryer
Membrane
Dryer
• •
P/N 86766, Rev. D October 2017