McQuay IM 743 User Manual

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Figure 9. Service Pin Location on the MicroTech II Chiller LONWORKS Communication Module
Network
C
onnector
Se rv ic e Pi n
2.36 in
Se rv ic e LED
Anomaly LED
1.14 in
8-Pin Connecto
r
De-commissioning a Chiller or Remote I/O Module from the CSM
To remove a chiller from the CSM, replace the existing Neuron ID address numbers with zeros and press the SAVE
CHANGES button on the Device Addressing screen. Disconnect any unused chillers (and remote I/O modules, if
applicable) from the L
ONWORKS network. This is done by unplugging the LONWORKS network connector from the chiller
or remote I/O’s L
ONWORKS Communication Module. The CSM’s LONWORKS network is dedicated only to those chillers
and remote I/O modules it is using for control. Failure to remove unused chillers and/or remote I/O modules connected to
the L
ONWORKS network may result in communication failures. The Device Status property of that chiller should change to
“outOfService”. If the Device Status property reads “outOfService, down” causing the Comm Loss between CSM and
Chiller X alarm to occur, save your changes and reboot the CSM. To save changes, press the SAVE DATABASE button
on the BAS Config screen. To reboot the CSM disconnect power until all LED’s go off.
Replacing a L
ONWORKS Communication Module on a Chiller
If the L
ONWORKS communication module on a chiller needs to be replaced and the previous module had already been
commissioned to the CSM:
To replace a commissioned chiller follow this procedure
1. Remove the existing Neuron ID from the CSM Chiller Number (see “De-Commissioning a Chiller or Remote I/O
Module from the CSM” above). Be sure to press the SAVE CHANGES button after zeroing the Neuron ID.
2. Commission the new L
ONWORKS device to the CSM (see “Commissioning a Chiller to a CSM Chiller Number”
above)
Commissioning a Remote I/O Module to a CSM Remote I/O Letter
The CSM uses remote I/O modules to add additional, expandable input/output capabilities. All remote I/O modules are
optional and only used based on your system requirements. Remote A, B, and C are only required if the CSM is
controlling cooling load pumps (secondary pumps), each module can control up to two pumps. Remote D is only required
if the CSM is controlling a chilled water loop bypass valve. Remotes E, F, G, and H are only required if the CSM is
directly controlling cooling tower operation (vs. the chillers controlling the cooling tower), with the quantity of cooling
tower remotes depending on the tower output requirements.
The Neuron ID is automatically passed from the Remote I/O module to the CSM when the CSM is prompted for the remote
I/O modules Service Pin and the module’s service pin is pressed. Unlike the chiller, there isn’t a separate L
ONWORKS
communication module on remote I/O modules; the LONWORKS hardware is built into the remote I/O module.
To commission remote I/O modules to the CSM follow this procedure
1. Wire the module to the CSM’s L
ONWORKS communication network per IM 781.
2. At the CSM’s user interface’s Device Addressing screen, click on the SERVICE PIN button of the remote I/O letter
you wish to assign this module to. A Service Pin Timer window will pop up with a 5-minute count down timer.

McQuay IM 743 Specifications

General

Brand	McQuay
Model	IM 743
Category	Controller
Language	English