WattMaster VAV - Manual (Page 15)

Component & System Wiring 15
5. When the Modular Service Tool is to be used for
programming and monitoring of the controllers it can be
connected to the WMVAV controllers using the supplied
cable with DIN connectors on both ends. The DIN
connector on the WMVAV controller is located near the
communications terminals. To connect the Modular Service
Tool to a VAVBOX controller, first unplug the 3 wire
communication terminal block from the VAVBOX
controller. Connect the DIN to terminal adapter terminal
end to the communication terminals block socket on the
VAVBOX controller then connect the DIN connector side
of the adapter to the Modular Service Tool cable DIN
connector. See page 44 of this manual for complete
Modular Service Tool connection diagrams and
instructions. 6. The Modular System Manager comes supplied with a 12-
foot modular cable pigtail with a modular connector on one
end and stripped wires on the other. Plug the modular
connector end into the System Manager modular connector.
Run 18 gauge, 2 conductor shielded cable for
communications from the MiniLink PD or any controller
on the local loop by connecting one end the controller’s or
MiniLink PD’s 3 wire “Local Loop” communications
terminal block to a junction box located within 12 feet of
the System Manager. Run 18 gauge, 2 wire, power wires
supplied by a separate 24 VAC, 6 VA minimum transformer
into the junction box. Splice the stripped modular cable
ends from the System Manager to the communications and
power wire inside of the junction box using solid
connections made with wire nuts or butt-splice connectors.
See Modular System Managerl wiring on pages 42 and 43
of this manual for wiring color coding and complete wiring
instructions. The Modular System Manager MUST always
be connected on the “Local Loop”, never the “Network
Loop”.
System Commissioning
The following information is a brief overview of the procedures re-
quired to commission a typical WattMaster VAV System.
1. Address each MiniLink PD on the system with a unique
address from 1 to 60.
2. On a loop of WMVAV controllers and/or Add-on Devices,
without VAVBOX Controllers, address the controllers and
devices from 1 to 59.
3. On a loop which has VAVBOX controllers, address
the VAVBOX controllers from 1 to 58. Address the
WMVAV controller serving the VAVBOX controllers as
address 59. Address all other controllers with addresses not
already used by other controllers on the loop.
4. Always apply power to the system in the following order.
WMVAV controllers or Add-on Devices, MiniLink PD(s),
CommLink, VAVBOX controllers (if used).
5. After powering up verify diagnostics LED indicator for
proper operation of all controllers. See the technical guide
for each specific controller for detailed information on the
location of its diagnostic LED, and each controller’s
start-up sequence.
6. If a computer is used, install the Prism computer front end
software on it and connect it to the CommLink to access
all of the controllers on the entire system for programming.
7. If a computer is not used, and if a Modular System Manger
is not already connected on the local loop, connect a
Modular Service Tool to one of the controllers to perform
programming of all controllers on the entire system.