Tracer® Zn520 Controller - Trane VUV Installation, Operation And Maintenance Manual

Installation - Controls
WARNING
Electrical Shock Hazard!
Turn off power at the main service panel by removing
the fuse or switching the appropriate circuit breaker to
the OFF position before removing the existing
thermostat.
Important: Thermostat installation must conform to local
and national building and electrical codes and
ordinances.
Note: Mount the thermostat about five feet above the floor.
Do not mount the thermostat on an outside wall, in
direct sunlight, behind a door, or in an area affected by
a vent or duct.
1. Turn off power by removing the fuse or switching the
appropriate circuit breaker off.
2. To remove cover, remove screw and pull gently at the seam
at the top.
3. Set thermostat away from working area.
4. Align thermostat base with junction box mounting holes
and feed the control wires through hole.
5. Use supplied screws to mount thermostat base to junction
box.
6. Wire nut the thermostat wires to your system wires.
7. Gently tug wire to be sure of proper connection. Double
check that each wire is connected to the proper terminal.
8. Snap thermostat to base that is mounted on the wall.
Refasten with screw.
9. Turn on power to the system at the main service panel.
10. Test thermostat operation as described in
Thermostat," p. 73.
CAUTION
Equipment Damage!
Be sure exposed portion of wires does not touch other
wires.
Tracer® ZN520 Controller
The Tracer® ZN520 controller is a factory-installed, -tested
and -commissioned LonTalk
control of Trane products. The discrete speed controller can
also be used in a stand-alone application. Features include:
• Automatic fan-speed reset
• Automatic ventilation reset
• Active dehumidification
• Manual output test
• Filter maintenance
• Manager/subordinate
34
""Testing
®
control designed to provide
• Water valve override
• Freeze avoidance
• Interoperability
Three generic I/O ports
The Tracer® ZN520 controller is designed to be used in the
following applications:
• As part of a Tracer® SC or Tracer Summit® building
automation system (BAS), the Tracer® ZN520 becomes
an important part of the Tracer® control system.
• The Tracer® ZN520 can function as a completely stand-
alone controller in situations where a BAS is not present.
• For situations when a non-Trane BAS is present, the
Tracer® ZN520 can be used as an inter-operable unit
controller.
Tracer® ZN520 controllers are LonTalk
with the Tracer® SC or Tracer Summit® building automation
system (BAS). Reference the unit wiring diagram or
submittals.
Ground shields at each Tracer® ZN520, taping the opposite
end of each shield to prevent any connection between the
shield and anther ground.
Note: For more detailed information, refer to:
• CNT-SVX04*-EN Tracer® ZN520 Unit Controller:
Installation, Operation and Programming Guide for the
communication wiring diagram
Communication Wire Specifications
Communication wire must conform to the following specifica-
tion:
• Shielded twisted pair 18 AWG
• Capacitance 23 (21–25) picofarads (pF) per foot
• Listing/Rating—300 V 150C NEC 725-2 (b) Class 2 Type
CL2P
• Trane Part No. 400-20-28 or equivalent
Note: Communication link wiring is a shielded, twisted pair of
wire and must comply with applicable electrical codes.
Controller communication-link wiring must be low capacitance,
18-gage, shielded, twisted pair with stranded, tinned-copper
conductors. For daisy chain configurations, limit the wire run
length to 5,000 ft. Truck and branch configurations are
significantly shorter. LonTalk
extended through the use of a link repeater.
General Wiring Guidelines
Follow these general guidelines when installing
communication wiring on units with a Tracer® ZN520
controller:
• Maintain a maximum 5000 ft. aggregate run.
• Install all communication wiring in accordance with the
NEC and all local codes.
®
devices that interface
®
wire length limitations can be
UV-SVX005G-EN