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McQuay IM 743 Installation Manual
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Page 14
IM 781-2
Figure 12. Mounting Guide
CSM M
ounting G
uide
11.375"
(28.89cm)
Mount with this end up.
Low
er mounti
ng hol
es are 0.221" (
0.56cm) di
a.
Clearance for a #10 screw.
.438"
(1.11cm)
Ø
.218"
(0.55cm)
Ø
.406"
(1.03cm)
DETAIL
KEYHOLE
Upper Mounting
Note
: Electronic and
pri
nted versi
ons of t
his
guide
may not show
the
mounting guide to scale.
Verify all measurements
be
fo
re d
rilling
.
9.50"
(24.13cm)
13
15
Table of Contents
Default Chapter
2
Table of Contents
2
Figures
3
Tables
4
Notice
4
Reference Documents
4
Revision History
5
Introduction
6
Figure 1. System Architecture
6
Applying the CSM
8
Typical Chilled Water System
8
Chiller Evaporator Configuration
8
Figure 2. Typical Chilled Water System
8
Figure 3. Parallel Configurations
9
Figure 4. Series/Parallel Configurations
9
Figure 5. Combination Configurations
9
Secondary Pump/Decoupler Line Configuration
10
Figure 6. Common Primary Pump with Separate Isolation Valves
10
Figure 7. Fixed-Speed Secondary Pump
10
Figure 8. Variable-Speed Secondary Pump
10
Loop Bypass Configuration
11
Figure 9. Lead/Standby Secondary Pumps
11
Figure 10. Sequenced Secondary Pumps
11
Figure 11. Pressure-Controlled Loop Bypass
11
General Description
12
Panel Location and Mounting
13
Unpack the CSM Panel
13
Physical Installation
13
Tools Required
13
Mounting
13
Figure 12. Mounting Guide
14
Figure 13. Mounting Detail
15
Removing and Replacing the Cover
16
Removing the Cover of a CSM
16
Replacing the Cover of a CSM
16
Sensor Installation
16
Immersion Water Temperature Sensor
16
Figure 14. Immersion Sensor
17
Figure 15. Brass Thermowell
17
Outdoor Air Temperature And/Or Relative Humidity Sensor
18
Figure 16. Outdoor Air And/Or Relative Humidity Sensor
18
Field Wiring
19
Power Wiring
19
About the CSM Transformer
19
Making the Power Connection to the CSM Transformer
19
Table 1. 120 VAC Models Building Power Termination
19
Ethernet Communications to the User Interface and Bacnet
20
LON WORKS Communications to Chillers and Remote I/O Modules
20
Table 2. International Models - 240 VAC Models Building Power Termination
20
Table 3. Examples of Possible Ethernet Hardware
20
Free Topology Networks
21
Figure 17. Singly Terminated Free Topology
21
Free Topology Restrictions
22
Bus Topology Networks
22
Bus Topology Restrictions
22
Figure 18. Combining Network Segments with a Repeater
22
Figure 19. Bus Network Topology
22
Network Cable Termination
23
Qualified Cables
23
Anaiog/Digital Inputs and Outputs Wiring
23
Onboard I/O Wiring
24
Table 4. Analog/Digital Inputs and Outputs
24
Figure 20. Thermistor Wiring
25
Temperature Inputs
25
0-10 VDC Inputs or 4-20 Ma Inputs
26
Figure 21. Analog Input 0-10VDC Wiring
26
Figure 22. Analog Input 4 to 20 Ma Wiring
27
Analog Input Cable Specifications
28
Digital Inputs
28
Digital Outputs
29
Figure 23. Digital Input Wiring
29
Figure 24. CSM Field Wiring Schematic
30
Remote I/O Wiring
31
Analog Inputs
31
Digital Inputs
32
Analog Outputs
32
Digital Outputs
33
Figure 25. CSM Remote I/O Modules a and B Field Wiring Schematic
35
Figure 26. CSM Remote I/O Modules C and D Field Wiring Schematic
36
Figure 27. CSM Remote I/O Modules E and F Field Wiring Schematic
37
Figure 28. CSM Remote I/O Modules G and H Field Wiring Schematic
38
Modems
39
Internal Modem
39
External Modem
39
Table 5. External Modem Hardware
39
Using the Admin Tool to Configure the Csm/Modem
40
About the Admin Tool
40
Configuring the CSM for Your Modem
40
Table 6. External Modem Modular Adapter Assembly Pin Assignments
40
Table 7. Modem Configuration Parameters (Ras.properties)
41
Initial Checkout and Troubleshooting
43
Checking the Heartbeat LED
43
About the Battery
43
Figure 29. Main Board Layout
44
Appendix A: Hardwired Chiller Control
45
Figure 30. Typical Hardwired Chiller Field Wiring Diagram
46
Hardwired Chiller Remote I/O Module Analog Inputs
47
Chiller % RLA (AI 1)
47
Chillers with % RLA Output
47
Figure 31. Direct % RLA Signal from Chiller
47
Chillers Without % RLA Output
48
Figure 32. Measuring Compressor Amps with a Current Output Current Transducer
48
Table 8. Signal Averaging Device Specification
48
Chiller Leaving Evaporator and Leaving Condenser Water Temperatures (AI 3 and AI 4)
49
Table 9. Current Transducer Specification
49
Table 10. Temperature Sensor Specification
49
Hardwired Chiller Remote I/O Module Digital Inputs
50
Evaporator and Condenser Flow Proving (DI 1 and DI 2)
50
Hardwired Chiller Alarms (DI 3 and Optionally DI 4)
50
Hardwired Chiller Remote I/O Module Analog Outputs
50
Hardwired Chiller Leaving Water Temperature Setpoint Reset (AO 1)
50
Hardwired Chiller Load Limiting (AO 2)
51
Hardwired Chiller Remote I/O Module Digital Outputs
51
Evaporator and Condenser Pump Control (Relay 1)
51
Evaporator and Condenser Pump Control (Relay 2 and Relay 3)
51
Transformer Usage
51
Table 11. Voltage to Current Converter (0-10 VDC to 4-20 Ma) Specification
51
Table 12. Hardwired Chiller's Hardware Transformer Usage
52
Figure 33. Hardwired Chiller's Possible Hardware Requirements
53
Maintenance
54
Cleaning
54
Required Battery Maintenance
54
Replacing the Battery
54
Parts List
55
Table 13. Standard Replacement Parts
55
Warranty
56
Warranty Return Material Procedure
56
Replacement Parts
56
Index
57
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McQuay IM 743 Specifications
General
Brand
McQuay
Model
IM 743
Category
Controller
Language
English
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