WarmlyYours PD Pro Snow Switch - Manual (Page 7)

Snow Switch ® Model PD Pro
Instruction Manual
23735 Rev. B 06/14 (800) 234-4239 http: www.networketi.com Environmental Technology, Inc. 7 of 30
With the Remote Control Unit, RCU–3, the operator is able to access the full range of system
functions and controls from a second location. With the RCU–3, the operator can manually set
the Cycle Time, equivalent to the Hold-On Time setting on the face of the unit itself, or manually
initiate or terminate a heating cycle. The capability for remote operation is especially useful if
the control box is installed either outside or in a location of the building not easily or readily
accessible by office personnel who may well be in a better location than building maintenance
personnel to assess the need to melt ice or snow from walkways or parking areas.
Also available for the PD Pro system is an optional temperature sensor assembly which senses
the temperature at the cable end and regulates the Hold-On Time period once precipitation has
ended and the call for heat has passed. Installed with the cable end placed at or near the heat
tape, the optional temperature sensor assembly or thermistor is a high-temperature shut-off and
regulates the Hold-On Time period by automatically suspending an active heating cycle if at any
time during that cycle, the temperature at the sensor end rises to above 45°F. Then, if, during
the Hold-On Time period, the temperature drops to below 44°F, the heating cycle will resume
automatically and continue until the end of the Hold-On Time period as set on the face of the
unit. This not only lowers system operating costs but also protects the heat tape from over-
heating.
As the placement of the RCU–3 remote control unit is a key factor in the overall configuration of,
as well as customer satisfaction with, the PD Pro system, it is important that it be installed as
part of the system initially. Similarly, as the temperature sensor assembly monitors the
temperature at the point of the cable end to keep the heat tape from over-heating, so it is
necessary, for best results, to lay the temperature sensor at the same time as the heat tape to
ensure proper placement and routing. It is not recommended to try and retrofit either of these
optional assemblies once the system is already installed and operational.
To ensure proper installation and to facilitate placement, wiring, routing, and function of either or
both the RCU–3 or the temperature sensor, it is strongly advised and suggested that these
assemblies, whether together or individually, be installed with the system initially rather than
retrofitted afterwards. Use the information below to order either or both of these important
optional components.
Order Number Description
21357 Optional Remote Control Unit RCU–3
19272 Optional Temperature Sensor Assembly
To order either or both of these optional components for your system, contact the Environmental
Technology Sales Department between the hours of 8:00 a.m. and 5:00 p.m. Eastern Time at
(574) 233-1202 or (800) 234-4239.