WattMaster VAV - Manual (Page 14)

Component & System Wiring 14
3. Connect 2 conductor shielded cable from one of the
systems MiniLink PD’s 3 wire communications terminal
blocks labeled “Network Loop” to the CommLink’s 3 wire
communications terminal block located on the back of the
CommLink. Find the 110 VAC/24 VAC power supply
furnished with the CommLink and connect the 2
stripped wire leads to the 24 VAC terminals on the back of
the CommLink. The CommLink’s internal jumper must be
set to “Multiple” for all WattMaster VAV systems. See page
45 of this manual for complete CommLink wiring and
jumper setting information. After determining all wiring
and jumper settings are correct, connect the power supply
plug-in transformer to a 110 V receptacle.
4. Connect 2 conductor shielded cable for network
communications between each MiniLink PD on the system
including the one that was just connected to the
CommLink. This is accomplished by connecting between
each MiniLink PD’s 3 wire communications terminal block
labeled “Network Loop” and the next MiniLink PD’s
communications terminal block labeled “Network Loop”.
Install a 24 VAC, 6 VA minimum, transformer for each of
the MiniLink PDs on the system and wire each transformer
to the 24 VAC power terminal block for its respective
MiniLink PD using 18 gauge minimum, 2 wire cable. See
page 46 of this manual for complete MiniLink PD wiring
diagrams and instructions.
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. 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 Manager 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”.
Loop(s) with WMVAV and VAVBOX Controllers
1. Select one of the local loops on your system. Connect all
WMVAV or Add-on Device controllers in a daisy chain or
star ring format by connecting from each controller’s
communication terminal block to the next using 18 gauge,
2 conductor shielded cable. Install a separate 24 VAC,
transformer for each controller and wire from each
controller’s power terminal block to its transformer using
18 gauge minimum, 2 wire cable for power. See Wire and
Transformer Sizing section on page 16 for detailed
transformer and wire sizing information. Observe polarity
on all board power wiring. Install a separate 24 VAC, 8 VA
minimum, transformer for each VAVBOX controller on the
loop and wire from each controller’s power terminal block
to it’s transformer using 18 gauge minimum, 2 wire cable.
Observe polarity on all boards! As an alternative, a single
transformer that connects to all VAVBOX controllers may
also be used. It must be sized to handle the minimum load
of 6 VA per VAVBOX controller connected to it. When
using this method, the polarity of all wiring between the
transformer and the VAVBOX controllers is extremely
critical and must be maintained to prevent damage to
all boards connected! See the wire and transformer sizing
information on page 16 of this manual for complete wire
and transformer sizing information. Repeat this procedure
for each loop with VAVBOX controllers on your system.
Warning: If polarity between controllers is not maintained,
severe damage to the controllers may result.
WattMaster recommends using a separate transformer
for each controller in order to eliminate the potential
for damaging controllers due to incorrect polarity.
2. For each local loop on the system do the following. Using
18 gauge 2 conductor shielded cable, connect from
one of the WMVAV controller’s on the loop, 3 wire
communications connector to that loop’s MiniLink PD 3
wire communications terminal block marked “Local Loop”.
3. To install the CommLink, connect 2 conductor shielded
cable from one of the system’s MiniLink PD’s 3 wire
communications terminal blocks labeled “Network Loop”
to the CommLink’s 3 wire communications terminal block
located on the back of the CommLink. Find the 110 VAC/
24 VAC power supply furnished with the CommLink and
connect the 2 stripped wire leads to the 24 VAC terminals
on the back of the CommLink. The CommLink’s internal
jumper must be set to “Multiple” for all WattMaster VAV
systems. See page 45 of this manual for complete
CommLink wiring and jumper setting information. After
determining all wiring and jumper settings are correct,
connect the power supply plug-in transformer to a 110 V
receptacle.
4. The following procedure must be performed for each
MiniLink PD on your system. Install a 24 VAC, 6 VA
minimum, transformer for theMiniLink PD and wire it to
the 24 VAC power terminal block on the MiniLink PD
using 18 gauge minimum, 2 wire cable. See page 46 of this
manual for complete MiniLink PD wiring diagrams and
instructions. Be sure that all MiniLink PDs on the entire
system are wired as required.
System Installation