Installation
RT-SVX35H-EN 49
d. 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 Figure 4, p. 19 - Figure 8, p. 23 for the electrical
access locations provided on the unit and Table 14 for
conductor sizing guideline
s and;
a. Use
standard copper conductor thermostat wire
unless otherwise specified.
b. Ensure that the wiring between the controls and the
unit's termination point does not exceed two and a
half (2.5) ohms/conductor for the length of the run.
Important: Resistance in excess of 2.5 ohms per
conductor can cause deviations in the
accuracy of the controls.
c. Do not run the electrical wires transporting DC
signals in or around conduit housing high voltage
wi
res.
Units equipped with a Trane Communication Interface
(TCI), BACnet Communication Interface (BCI), or LonTalk
communication Interface (LCI) option which utilizes a
serial communication link;
a. Must be 18 AWG shielded twisted pair cable
(Belden 8760 or equivalent).
b. Must not exceed 5,000 feet maximum for each link.
c. Must not pass between buildings.
Constant Volume System Controls
Remote Panel w/o NSB BAYSENS110*
This electronic sensor features four system switch settings
(Heat, Cool, Auto, and Off) and two fan settings (On and
Auto) with four system status LED's. It is a manual or
automatic changeover control with dual setpoint
capability. It can be used with a remote zone sensor
BAYSENS077*. Refer to Table 15, p. 52 for the
Temperature vs. Res
istance coefficient.
Constant Volume Zone Panel - BAYSENS108*
This electronic sensor features four system switch settings
(Heat, Cool, Auto, and Off) and two fan settings (On and
Auto). It is a manual or automatic changeover control with
dual setpoint capability.
Variable Air Volume System Controls
VAV Changeover Contacts (5K87)
These contacts are connected to the RTM when daytime
heating on VAV units with internal or external hydronic
h
eat is required. Daytime (occupied) heating switches the
system to a CV type mode of operation. Refer to the unit
wiring diagram for the field connection terminals in the
unit control panel. The switch must be rated at 12 ma @ 24
VDC minimum.
Constant Volume or Variable Air Volume
System Controls
Remote Human Interface Module (5U66)
The Remote Human Interface module enables the
operator to set of modify the operating parameters of the
unit using it's 16 key keypad and view the operating status
of the unit on the 2 line, 40 character LCD screen without
leaving the building. However, the Remote Human
Interface module can not be used to perform any service
functions.
One remote panel is designed to monitor and control up to
four units providing each of the u
nits are equipped with an
I
PCB module. Use the installation instructions that
shipped with the module to install it, and the appropriate
illustrations in Figure 27, p. 44 or Figure 33, p. 57 to
connect it to the unit.
Remote Panel w/ NSB - BAYSENS119*
This 7 day programmable sensor features four periods for
Occupied\Unoccupied programming per day. Either one
or all four periods can be programmed. If the power is
i
nterrupted, the program is retained in permanent
memory. If power is off longer than 2 hours, only the clock
and day may have to be reset.
The front panel allows selection of Occupied/Unoccupied
periods with two temperature inputs (Cooling Supply Air
Temperature and Heating Warm-up temperature) per
occupied period. The occupied cooling setpoint ranges
between 40°F and 80°F. The warm-up setpoint ranges
between 50°F and 90°F with a 2° deadband. The
Unoccupied cooling setpoint ranges between 45°F and
98°F. The heating setpoint ranges between 43°F and 96°F.
The liquid crystal display (LCD
) displays zone temperature,
te
mperature setpoints, week day, time, and operational
mode symbols. The DIP switches on the subbase are used
to enable or disable applicable functions, i.e.; Morning
warm-up, economizer minimum position override during
Table 13. AC Conductors
Distance from Unit
to Control
Recommended
Wire Size
000 - 460 feet 18 gauge
461 - 732 feet 16 gauge
733 - 1000 feet 14 gauge
Table 14. DC conductors
Distance from Unit
to Control
Recommended
Wire Size
000 - 150 feet 22 gauge
151 - 240 feet 20 gauge
241 - 385 feet 18 gauge
386 - 610 feet 16 gauge
611 - 970 feet 14 gauge
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