Trane IntelliPak SCRF 25, Installation, Operation And Maintenance Manual

Page: 49 / 120

SCXF-SVX01Q-EN 49
subbase. See Figure 26, p. 49 . Seal the hole in the wall
behind the subbase.
N No otte e:: Guidelines for wire sizes and lengths are shown
in Table 31, p. 49 . The total resistance of these
low voltage wires must not exceed 2.5 ohms per
conductor. Any resistance greater than 2.5 ohms
may cause the control to malfunction due to
excessive voltage drop.
N No otte e:: Do not run low-voltage control wiring in same
conduit with high-voltage power wiring.
Wiring
1. Run wires between the unit control panel and the
zone sensor subbase. To determine the number of
wires required, refer to the unit wiring diagrams.
2. Connect the wiring to the appropriate terminals at
the unit control panel and at the zone sensor
subbase. In general, zone sensor connections to the
unit use the convention of connecting zone sensor
terminals to like numbered unit terminals (1 to 1, 2
to 2, etc.).The connection detail is shown on the unit
wiring diagrams, which are located in the unit
control panel.
3. Replace the zone sensor cover back on the subbase
and snap securely into place.
Standard Remote Sensor (BAYSENS077)
When using the remote sensor, BAYSENS077, mount it
in the space that is to be controlled. Wire according to
the interconnecting wiring diagrams on the unit.
Table 31. Zone sensor maximum lengths and wire
size
Distance from Unit to
Controller
Recommended Wiring
Size
0-150 feet 22 gauge
151-240 feet 20 gauge
241-385 feet 18 gauge
386-610 feet 16 gauge
611-970 feet
14 gauge
Figure 26. Typical zone sensor installation
Junc-
tion
Mounting to Junction Box
Mounting Directly to the Wall
Programmable Zone Sensors
BAYSENS119
The BAYSENS119 programmable night set back sensor
provides multi functional flexibility for both Constant
Volume and Variable Air Volume control. This
electronic programmable sensor includes auto or
manual cooling and heating changeover with seven-
day programming.
Five tactile feel buttons located on the sensor front
panel provide interface for all programming, including
initial setup for CV or VAV control. Sensor functionality
includes up to four daily programmable periods for
Occupied/Unoccupied operation, and Override. The
dynamic LCD display indicates status for System On/
Off, Heat, Cool, Fan Status, Time of Day, Occupied/
Unoccupied mode, Space Temperature, Space or
Discharge Air Heating and Cooling Setpoints.
Additional features include Service Indication for Heat
Failure, Cool Failure, Fan Failure, and Test Mode if
system is operating in test mode.
A Check Filter Timer function is included. Filter service
countdown time can be set in one-day increments.
Activation of the Test/Configuration button located on
the bottom of the sensor performs a sensor self-
diagnostic routine and indicates hours in service.
When the BAYSENS119 is programmed for Constant
Volume or VAV control, Night Setback is initiated
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