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Field Installed Control Wiring
The Symbio™ 800 must have a mode input in order to
operate the rooftop unit. The flexibility of having several
system modes depends upon the type of sensor and/or
remote panel selected to interface with the The Symbio™
800. An overall layout of the various control options
available, with the required number of conductors for each
device, is illustrated beginning with .
Note: All field wiring must conform to NEC guidelines as
well as state and local codes.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury.
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements
for field wiring installation and grounding as
described in NEC and your local/state/national
electrical codes.
The various field installed control panels, sensors,
switches, and contacts discussed in this section require
both AC and DC consideration. These diagrams are
representative of standard applications and are provided
for general reference only. Always refer to the wiring
diagram that shipped with the unit for specific electrical
schematic and connection information.
Controls using 24 VAC
Before installing any connecting wiring, refer to
21
for the electrical access locations provided on the unit,
and
Table 29, p. 57
for AC conductor sizing guidelines.
Then check the following:
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
1. Use copper conductors unless otherwise specified.
RT-SVX073A-EN
2. Ensure that the AC control wiring between the controls
and the unit's termination point does not exceed three
(3) ohms/conductor for the length of the run.
Note: Resistance in excess of 3 ohms per conductor may
3. Make sure to check all loads and conductors for
grounds, shorts, and mis-wiring.
Table 29. AC conductors
Distance from Unit to Control
4. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
Controls using DC Analog Input/Outputs
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to the appropriate illustration in
electrical access locations provided on the unit and
30, p. 57
following:
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
1. Use standard copper conductor thermostat wire unless
otherwise specified.
2. Ensure that the wiring between the controls and the
unit termination point does not exceed two and a half
(2.5) ohms/conductor for the length of the run.
Note: Resistance in excess of 2.5 ohms per conductor can
Table 30. DC conductors
Figure 3, p.
Distance from Unit to Control
3. Do not run the electrical wires transporting DC signals
in or around conduit housing high voltage wires. Units
wired for a BACnet® Communication, LonTalk®
cause component failure due to insufficient AC
voltage supply.
000-460 feet
461-732 feet
733-1000 feet
for conductor sizing guidelines. Then check the
NOTICE
cause deviations in the accuracy of the controls.
000-150 feet
151- 240 feet
241- 385 feet
386- 610 feet
611- 970 feet
Installation
Recommended Wire Size
18 gauge
16 gauge
14 gauge
Figure 3, p. 21
for the
Table
Recommended Wire Size
22 gauge
20 gauge
18 gauge
16 gauge
14 gauge
57
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