4
IM 474-3
This equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with this instruction manual, may cause interference to radio communications.
It has been tested and found to comply with the limits for a Class A digital device, pursuant to part
15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his or her own expense.
McQuay International
disclaims any liability resulting from any interference or for the correction thereof.
Applying the OPM Panel
McQuay International has provided several BAS manufacturers licensed access to our MicroTech
stand-alone controllers. This access, which is called Open Protocol™, allows a BAS to monitor status
and change limited control parameters in McQuay International HVAC equipment. The result is a
fully integrated BAS. Note that an Open Protocol application does not always require an OPM
Panel.
When to Use an OPM Panel
The OPM Panel should be used when there are two or more MicroTech controllers that need to be
interfaced with a BAS by means of a single-point connection. (The maximum number of unit
controllers per OPM depends on the BAS.) For example, the OPM Panel could combine a McQuay
centrifugal chiller, a McQuay applied rooftop unit, and several AAF® unit ventilators into a network
that a BAS could connect to with a single cable.
An OPM network can include any two or more of the following MicroTech controllers:
•
Series-100 centrifugal chiller (old style)
•
Series-200 centrifugal chiller
•
Reciprocating chiller
•
Screw chiller
•
MicroTech Absorption Gateway (for McQuay absorption chillers)
•
Applied rooftop unit
•
Self-contained air conditioning unit
•
Series-100 unit ventilator (old style)
•
Series-300 unit ventilator
•
Water source heat pump (old style)
•
MicroTech Communications Gateway (for water source heat pumps with MicroTech 2000™
controllers)
The OPM acts only as a passive communications link between MicroTech controllers and the BAS. It
does not perform any supervisory control for the various MicroTech controllers connected to it. Since
all communications are handled by the OPM controller’s operating system, its application software is
virtually nonexistent. When an OPM is used, all supervisory control (e.g., scheduling, overrides,
chiller sequencing) is handled by the BAS.
When Not to Use an OPM Panel
•
Only one controller
In a situation where there is only one MicroTech controller (for example, one centrifugal chiller),
the OPM Panel is not required because a single controller can be directly connected to the BAS.
This applies equally to every controller listed above in “When to Use an OPM Panel,” including
the MicroTech Absorption Gateway and the MicroTech Communications Gateway.
•
Single-point connection not required
Use an OPM to
provide a single-point
connection from a
third-party BAS to a
MicroTech network.
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