McQuay MicroTech User Manual

IM 474-3
5
Some BAS companies do not require a single-point connection to multiple units. For example,
they may be capable of providing a low-cost, separate connection to every unit ventilator
controller in a building. In this instance, an OPM is not required.
• MCG and MicroTech 2000 controllers only
If a BAS will be connected to a series of MicroTech 2000 controllers (and no MicroTech
controllers), the MicroTech Communications Gateway (MCG) can substitute for an OPM. In this
instance, an OPM is not required. (Since the MCG is considered a MicroTech controller and
MicroTech 2000 controllers are not, this is just a specific “only-one-controller” application.)
• Supervisory control by McQuay
In many cases, a BAS will perform supervisory control for the MicroTech unit controllers
connected to it via an OPM; for example, the BAS may provide sequencing control for several
chillers. However, this same control may be performed by a MicroTech network controller such
as the CSC. In this instance, an OPM is not required. See “Alternatives to the OPM Panel”
below.
Alternatives to the OPM Panel
The following MicroTech network controllers, which perform specific supervisory control tasks, can
substitute for the OPM Panel:
• Remote Monitoring and Sequencing Panel
• Remote Monitoring and Control Panel
• Chiller System Controller
• Lead-Lag/Load Balance Panel (obsolete)
• Chiller Plant Controller (obsolete)
Remote Monitoring and Sequencing Panel (RMS)
The RMS Panel networks up to three reciprocating or screw chillers. It provides remote monitoring
and chiller sequencing control. For more information, see Bulletin No. IM 498.
Remote Monitoring and Control Panel (RMC)
The RMC Panel networks up to eight applied rooftop or self-contained air conditioning systems. It
provides remote monitoring and multiple-unit control. For more information, see Bulletin No. IM
444.
Chiller System Controller (CSC)
The CSC networks up to four dual-compressor centrifugal chillers, up to eight single-compressor
centrifugal chillers, up to eight reciprocating or screw chillers, or any combination of these that
results in eight or fewer unit controllers. It provides remote monitoring, chiller sequencing control,
chilled water temperature control, and auxiliary control for a variety of chiller plant equipment. For
more information, see Bulletin No. IM 618.
Lead-Lag/Load Balance Panel (LLLB)
The LLLB Panel networks two single-compressor series-100 centrifugal chillers or the two
compressor controllers on a dual-compressor series-100 centrifugal chiller. It provides compressor
lead-lag and load balancing control. For more information, see Bulletin No. IM 425.
Chiller Plant Controller (CPC)
The CPC networks up to six series-100 centrifugal chiller (compressor) controllers. It provides chiller
sequencing and cooling tower control. For more information, see Bulletin No. IM 433.
Loop Water Controller
The MicroTech Loop Water Controller (LWC) provides loop water temperature and pump control for
a water source heat pump system. The LWC can be included in an OPM network, but we strongly
Other level-1
MicroTech controllers
can be used instead
of an OPM. These
controllers perform
specific supervisory
control, but cost
more.
For more on the
LWC, see IM 431.

McQuay MicroTech Specifications

General

Brand	McQuay
Model	MicroTech
Category	Modem
Language	English