WattMaster WM-WCC3-TGD-01B - Manual (Page 33)

I. INTRODUCTION
WCC III Technical Guide I-11
Satellite Types - SAT 3F
SAT 3F ( OE456) - Figure I-7 (SS5016)
The new SAT 3F controller is an advanced product replacement for
the older SAT 2D controller, which WattMaster Controls has sold
for many years. The SAT 3F 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 3F
controller is a drop-in functional replacement for the older SAT 2D
controller, but the SAT 3F’s use requires that the WCC II front-end
computer must be replaced with a WCC III - MCD. The SAT 3F is
a version of the satellite controller that allows the WCC III - MCD
to communicate with remote-mounted Terminal Unit Controllers
(TUC/VAVZ II).
The Terminal Unit Controller (TUC/VAVZ II) 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/VAVZ II can be used as a stand-alone
controller or can be used with the WCC III system.
The TUC/VAVZ II accepts an input from a room temperature
sensor to allow it to monitor the space temperature. When used
with an actuator, the TUC/VAVZ II 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 an integral part of the VAVZ II Controller Actuator
Package and does not need to be purchased separately. The TUC/
VAVZ II can also have four relay outputs to provide control of the
fan and fi rst, second, and third stages of heat on fan terminal units
or to control the fan, compressor, and reversing valve on a heat
pump. The TUC/VAVZ II 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/VAVZ II is
generally mounted at the terminal unit (i.e. VAV box, heat pump,
etc.).
When the TUC/VAVZ II controllers are to be used with the
WCC III system, a SAT 3F satellite controller is required as the
interface between the MCD and the Terminal Unit Controller
(TUC/VAVZ II). The SAT 3F is a special version of the satellite
controller, and its only purpose is to interface with the TUC/VAVZ
II controllers. Up to 16 TUC/VAVZ II controllers can be connected
to one SAT 3F using a 2-wire, shielded cable. The TUC/VAVZ
II controller’s communication connections are wired to the SAT
3F 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/VAVZ II controller back to the SAT 3F controller.
The 2-wire communications cable with shield is run from the
SAT 3F controller to the nearest TUC/VAVZ II controller, and
the 2-wire communications cable with shield is extended from
that TUC/VAVZ II controller to the next TUC/VAVZ II controller.
The SAT 3F controller is basically an interface converter between
the application-specifi c software that is written for the VAVZ II
controller and the SAT III controller software control structure.
These inputs and outputs on the VAVZ II are “shoe horned” into the
standard SAT III software control structure with the use of the SAT
3F controller. When viewing or changing the setup and operation
of the application-specifi c VAVZ II controller, you must use the
SCUSCR.EXE program to program and administer changes to
these application-specifi c TUC/VAVZII controllers. On the WCC
III Satellite structure, the SAT 3F 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 3F
controller.