SPYDER MODEL 7 VAV CONTROLLER INSTALLATION INSTRUCTIONS
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SYLK™ BUS
Sylk™ Bus compatible wall modules such as TR120 can
be connected to the controller's Sylk™ (terminals 14 and
15).
• Sylk™ is a two wire, polarity insensitive bus.
• The maximum current provided at the Sylk™ bus
interface is 96 mA.
• The WEBs-N4 software has a built-in resource
calculator to calculate the number of Sylk™ wall
modules can be connected. The WEBs-N4 calculates
the maximum number of modules based on the
following information for each wall module:
•
Sylk™ bus power consumption.
•
Number of parameters used.
•
Total config file size.
Supported Sylk bus devices
The Spyder Model 7 VAV supports the following Sylk™
devices and actuators.
•
Sylk™ bus modules:
TR40, TR40-H, TR40-CO2,
TR40-H-CO2, TR42, TR42-H, TR42-CO2, TR42-H-
CO2, TR71, TR71-H, TR75, TR75-H, TR120, and
TR120-H.
•
Sylk™ actuator:
MS3103, MS3105, MS4103,
MS4105, MS7403, MS7405, MS7503, MS7505,
MS8103, MS8105 spring return direct-coupled
actuators (DCA) are used within heating, ventilating,
and air-conditioning (HVAC) systems. They can drive
a variety of quarter-turn, final control elements
requiring spring return fail-safe operation.
NOTE:
• The firmware version for TR42x wall modules
must be 1.00.3 or higher.
• TR70 wall modules are not supported.
NOTE:
• Shielded cable is recommended if there is a need
to reduce the effect of electrical noise.
Sylk bus Wiring Example
Fig. 34 Sylk™ Wiring Topologies
Table 22. Recommended maximum distances
Single Twisted Pair, Non-
shielded, Stranded or Solid
a)
Standard Non-
twisted Thermostat
Wire Shielded or
Non-shielded,
Stranded or Solid
b)
18 - 22 AWG
(0.048 - 0.028 in)
(0.3 to 1 mm
2
)
24 AWG
(0.022 in)
(0.2 mm
2
)
18 - 24 AWG
(0.048 - 0.022 in)
(0.2 to 1 mm
2
)
500 ft
(150 m)
400 ft
(120 m)
100 ft
(30 m)
a)
As a rule of thumb, single twisted pair (two wires per
cable, only), thicker gauge, non-shielded cable
yields the best results for longer runs.
b)
The 100 ft (30 m) distance for standard thermostat
wire is conservative but is meant to reduce the
impact of any sources of electrical noise (incl. but
not limited to VFDs, electronic ballasts, etc.).
Table 22. Recommended maximum distances
Single Twisted Pair, Non-
shielded, Stranded or Solid
a)
Standard Non-
twisted Thermostat
Wire Shielded or
Non-shielded,
Stranded or Solid
b)
Number of Devices: Subjected to power loading.
To additional
Sylk devices
Polarity-
independent
Sylk Device
e.g. TR75, TR120,
TR40, and TR42.
14 15
Star Topology
Daisy Chain
69.8 °F
FAN
OVERRIDE
Spyder
Model 7
Spyder
Model 7
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