IOMM AGR-1
AGR 070A through 100A
9
Figure 5, Typical field evaporator water piping
Flow Switch
Mount a water flow switch in either the entering or leaving (recommended) water line to shut down
the unit when water flow is interrupted.
A flow switch is available from McQuay (part number 0017503300). It is a “paddle” type switch and
adaptable to any pipe size from 3” (76mm) to 8” (203mm) nominal. Certain minimum flow rates are
required to close the switch and are listed in Table 3. Installation should be as shown in Figure 6.
Connect the normally open contacts of the flow switch in the unit control center at terminals 5 and 6.
There is also a set of normally closed contacts on the switch that can be used for an indicator light or
an alarm to indicate when a “no flow” condition exists. Freeze protect any flow switch that is
installed outdoors.
NOTE:
Differential pressure switches are not recommended for outdoor installation.
Table 3, Flow Switch Minimum Flow Figure 6, Flow Switch Installation
NOMINAL PIPE SIZE
INCHES (MM)
MINIMUM REQUIRED
FLOW TO
ACTIVATE SWITCH -
GPM (L/S)
3 (76.20
30.00 (1.90)
4 (101.6)
39.70 (2.50)
5 (127.0)
58.70 (3.70)
6 (152.4)
79.20 (5.00)
Water Connections
Bring water piping to the evaporator through the side, between the vertical supports.
Refrigerant Charge
All units are designed for use with R-22 and other refrigerants. See nameplate for specific refrigerant
used. Units are shipped with an operating charge and ready for operation. The operating charge
(using R-22) for each unit is shown in the Physical Data tables beginning on page 13.
Flow direction marked
on switch
1" (25mm) NPT flow
switch connection
Tee
Summary of Contents for AGR 070AS
Page 20: ...20 AGR 070A through 100A IOMM AGR 1 Figure 9 Typical Field Wiring with Global UNT Controller...
Page 22: ...22 AGR 070A through 100A IOMM AGR 1 Figure 11 Standard Single Point Connection with FanTrol...
Page 24: ...24 AGR 070A through 100A IOMM AGR 1 Figure 13 Unit Control Schematic 2 compressor UNT...
Page 25: ...IOMM AGR 1 AGR 070A through 100A 25 Figure 14 Staging Schematic 2 compressor 4 stage UNT...
Page 26: ...26 AGR 070A through 100A IOMM AGR 1 Figure 15 Staging Schematic 2 compressor 6 stage UNT...
Page 27: ...IOMM AGR 1 AGR 070A through 100A 27 Figure 16 MicroTech Controller Schematic...
Page 28: ...28 AGR 070A through 100A IOMM AGR 1 Figure 17 Unit Control Schematic MicroTech...
Page 29: ...IOMM AGR 1 AGR 070A through 100A 29 Figure 18 Staging Schematic 4 stage MicroTech...
Page 30: ...30 AGR 070A through 100A IOMM AGR 1 Figure 19 Staging Schematic 6 stage MicroTech...
Page 31: ...IOMM AGR 1 AGR 070A through 100A 31 Figure 20 Unit Control Schematic 2 compressor MicroTech...
Page 32: ...32 AGR 070A through 100A IOMM AGR 1 Figure 21 UNT Instrument Layout See legend on page 34...
Page 35: ...IOMM AGR 1 AGR 070A through 100A 35 Figure 25 MicroTech Sensor Layout...
Page 99: ...IOMM AGR 1 AGR 070A through 100A 99 Notes...
Page 100: ...Post Office Box 2510 Staunton Virginia 24402 USA 800 432 1342 www mcquay com...
