2.6.4
Radio Control Switch
The Radio Control Switch shall decode the baseband signal from the received
of [139-173 MHz] [_____] FM carrier. The RCS shall utilize "distributed
intelligence" and shall be capable of providing control for a minimum of 8
hours upon the receipt of a single radio command. The RCS shall also
utilize a linear control algorithm, which will provide randomly selected
start and stop times to ensure smooth transition into as well as out of
control. The RCS shall be a two-function controller with the capability of
remote programmable cold load pickup. RCSs shall have sufficient memory to
record programmed parameters and operation. The unit shall have the
capability of dumping this recorded data to a portable retrieval device.
The RCS shall incorporate a 7.5-minute plus or minus 1.5-minute timer and
restore the controlled service when the time out period has elapsed and
another signal is not received. The RCS should also incorporate into an
Adaptvie Algorithm for air conditioning control. An Adaptive Algorithm
(AA) allows the run switch to monitor the run time of the air conditioner
it is connected to in blocks of one hour. When the control unit receives
an Adaptive Algorithm control message, it takes the previous run time of
the air conditioner and controls it for that percentage of time.
2.6.5
Control Relay
Control Relay shall be rated for the load that it is shown to control on
plans. Relay life shall be at least 300,000 operations at the rated load.
When the RCS's address or the SCRAM code is broadcast, the control relay
shall be energized to open its contacts and thus interrupt the continuity
of a device's control circuit. If there is no power to the board (e.g.,
utility outage), the control relay shall return to its normally closed
position. The RCS shall include two light-emitting diodes (LEDs) which
will emit light through a transparent lens ot the RCS's weatherproof
housing whenever the control relay is open (i.e., activated) or a test
signal is received.
2.6.6
Power Supply Transformer
Power Supply Transformer shall be securely mounted inside of the RCS's
housing and shall provide the secondary voltage required by the
microprocessor based printed circuit board. The Contractor shall not use
the thermostatic control voltage to power the RCS's circuit board. The
Maximum VA rating of the transformer must meet the requirements of the FM
radio circuit board. Unless otherwise noted on plans or in specifications,
the primary voltage to be used is 120/240 VAC, 60 Hz. Power supply
transformer shall be Class 2, UL approved. It shall be the split bobbin
wound coil type utilizing approved materials to meet UL 1585. Power supply
transformer shall operate without interference to RCS operation under
conditions specified in paragraph FM RADIO CONTROL SYSTEM COMPUTER
EQUIPMENT, subparagraph Computer. The power supply transformer shall
include fuse protection. The accompanying fuse shall be rated to blow when
transformer's current draw exceeds 10 percent of maximum VA rating. It
shall be installed on the Hot primary conductor of the transformer in a
suitable in-line fuseholder UL 512.
2.6.7
Enclosures
The weatherproof enclosure constructed of a polycarbonate material with
door gasket and mounting hardware shall conform to NEMA 250 and shall meet
NEMA III and NEMA IV raintight criteria. Finish color shall be the
SECTION 16797A
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