Carrier WeatherExpert 48N2 - Space Temperature Sensor (T-55); Space Temperature Sensor (T-56); Space Temperature Sensor (T-58); Space Temperature Averaging

42
SPACE TEMPERATURE SENSOR (T-55)
The space temperature sensor (P/N 33ZCT55SPT), if used, is
wired to terminals in the unit main control box. To connect the
space temperature sensor, see Fig. 48.
Fig. 48 — T-55 or T-56 Wiring
SPACE TEMPERATURE SENSOR (T-56)
The space temperature sensor (P/N 33ZCT56SPT), if used, is
wired to terminals in the unit main control box. To connect the
space temperature sensor, see Fig. 48.
SPACE TEMPERATURE SENSOR (T-58)
The communicating space temperature sensor (P/N
33ZCT58SPT) is wired to the Carrier Comfort Network
®
(CCN)
connections on TB202.
SPACE TEMPERATURE AVERAGING
Applications that require averaging using multiple space tempera-
ture sensors can be satisfied using either 4 or 9 sensors as shown in
Fig. 49.
NOTE: Only Carrier sensors may be used for standard T-55 space
averaging. Sensors must be used in multiples of 1, 4, and 9 only,
with total sensors wiring not to exceed 1000 ft.
NOTE: Do not use T-56 sensors for space temperature averaging
because the 5-degree offset function will not work in a multiple
sensor application.
HEAT INTERLOCK RELAY (VAV UNITS ONLY)
The heat interlock relay is not necessary for digital air volume
applications.
Variable air volume (VAV) units using morning warm-up and/or
occupied heating require that room terminals be controlled to a po-
sition that provides the minimum required heating cfm or greater
when the unit goes into Heating mode. The HIR (heat interlock re-
lay) function is provided for this control. When the unit goes into
Heating mode, the HIR is energized to provide switch closure or
opening (depending on how the field-supplied power source is set
up) to open the room terminals. The field connections for the HIR
are at TB201 terminals 9 and 10. See Fig. 50.
Option and Accessory Control Wiring
The 48N Series units may be used in applications with additional
control features, options, or accessories. Refer to the Controls,
Start-Up, Operation, Service and Troubleshooting manual for
more information concerning installation and configuration of op-
tions and accessories. Figures 50-60 contain wiring information
on the following features:
• heat interlock relay (Fig. 50)
• outdoor air enthalpy switch (Fig. 51)
• CO
2
space sensor (Fig. 52)
• filter status switch (Fig. 53)
• fan status switch (Fig. 54)
• space humidity sensor (Fig. 55)
• return air humidity sensor (Fig. 55)
• return air CO
2
sensor (Fig. 56)
• return air smoke detector (Fig. 57)
• smoke control — fire shutdown (Fig. 58)
• smoke control — purge (Fig. 59)
• smoke control — evacuation (Fig. 59)
• smoke control — pressurization (Fig. 59)
• CCN connections (Fig. 60)
NOTE: When enabling these options in the control make sure the
CEM or other required board were shipped in the unit. Otherwise
the sensor will not function and communications errors to non ex-
istent boards will result.
1
24
3
5
6
7
8
9
10
12
13
14
15
16
T56- SPTT55- SPT
UNIT
TB201
11
SEN
SEN SET
JUMPER
TERMINALS
3
21
TB201
T55