WattMaster WM-WCC3-TGD-01B - Manual (Page 31)

I. INTRODUCTION
WCC III Technical Guide I-9
Satellite Types - SAT 3D
SAT 3D ( OE455) - Figure I-6 (SS5005)
The new SAT 3D controller is an advanced product replacement
for the older SAT 2D controller which WattMaster Controls has
sold for many years. The SAT 3D controller is 2/3 the size of the
older SAT 2D controller. This size change was done to reduce the
overall footprint so that more controllers can fi t into a panel. The
SAT 3D controller is a drop-in functional replacement for the older
SAT 2D controller, but the SAT 3D’s use requires that the WCC II
front-end computer must be replaced with a WCC III - MCD. The
SAT 3D is a version of the satellite controller that allows the WCC
III - MCD to communicate with remote-mounted Terminal Unit
Controllers ( TUC-2R , TUC-5R, and TUC-5R+).
The Terminal Unit Controller (TUC) is a microprocessor-based
device which can be used to control terminal units such as pressure
dependent/independent variable air volume (VAV) boxes, pressure
dependent/independent fan power boxes, fan coil units, heat pumps
etc. The TUC can be used as a stand-alone controller or can be
used with the WCC III system.
The TUC accepts an input from a room temperature sensor to allow
it to monitor the space temperature. When used with an actuator,
the TUC provides pressure dependent/independent control of the
primary air damper on terminal units such as variable air volume
boxes, constant fan power induction units, and intermittent fan
power induction units. The electronic actuator is not an integral
part of the TUC-2R and must be ordered and purchased separately.
The TUC-2R can also have four relay outputs to provide control
of the fan and fi rst and second stages of heat on fan terminal units
or to control the fan, compressor, and reversing valve on a heat
pump. The TUC-2R can also provide an output to control two 24
VDC solenoid air valves to obtain “feed” and “bleed” type control
of pneumatic controlled devices. The TUC is generally mounted at
the terminal unit (i.e. VAV box, heat pump, etc.).
When the TUC controllers are to be used with the WCC III system,
a SAT 3D satellite controller is required as the interface between
the MCD and the Terminal Unit Controller (TUC). The SAT 3D
is a special version of the satellite controller, and its only purpose
is to interface with the TUC controllers. Up to 32 TUC controllers
can be connected to one SAT 3D using a 2-wire, shielded cable.
The TUC controller’s communication connections are wired to
the SAT 3D controller in a “daisy chain” arrangement. That is to
say, the 2-wire communications cable with shield does not have to
be run from each TUC controller back to the SAT 3D controller.
The 2-wire communications cable with shield is run from the
SAT 3D controller to the nearest TUC controller, and the 2-wire
communications cable with shield is extended from that TUC
controller to the next TUC controller. The SAT 3D controller is
basically an interface converter between the application-specifi c
software that is written for the TUC-2R controller (Some TUC-
5Rs), and the SAT III controller software control structure. These
inputs and outputs on the TUC-2Rs (Some TUC-5Rs) are “shoe
horned” into the standard SAT III software control structure with
the use of the SAT 3D controller. When viewing or changing the
setup and operation of the application-specifi c TUC-2R controller
(Some TUC-5Rs) you must use the SCUSCR.EXE program to
program and administer changes to these application-specifi c
TUC-2R controllers. (Some TUC-5Rs) On the WCC III Satellite
structure the SAT 3D uses or takes the place of 4 SAT III controllers
starting with address #4.
See Section 15 for specifi c use and application of the SAT 3D
controller.