41
Table 12 — Air Pressure Tube Connections
Fig. 46 — Side Post and Panel Installation
CONTROLS INSTALLATION
Constant Volume / Staged Air Volume Units
The 48N units may be used in applications with additional control
features, options, or accessories. Refer to the appropriate accesso-
ry installation instructions for more information on installing that
accessory. Control options and accessories available for Constant
Volume (CV) / Staged Air Volume (SAV™) units are:
• thermostats
• differential enthalpy sensor
• return air humidity sensor
• outdoor air humidity sensor
• relative humidity space sensor
• CO
2
sensors
• fan status switch
• filter pressure transducer
• return smoke detector
• CEM (controls expansion module)
• EXB (economizer control board) module
CONTROL WIRING
The unit can be controlled with a Carrier-approved accessory elec-
tro-mechanical or electronic thermostat that has two stages of
cooling, two stages of heating control, and an output for fan con-
trol. The thermostat may also include time of day scheduling or
use scheduling routines built into the ComfortLink controls.
Install the thermostat according to the installation instructions
shipped with the accessory thermostat. Locate thermostat assem-
bly on a solid interior wall to sense average temperature.
Route thermostat cable or equivalent leads of colored wire from
subbase terminals through conduit into the low voltage connec-
tions in the main control box. For thermostat TB201 connections,
see Fig. 47.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For over 75 ft, use
no. 14 AWG insulated wire (35 C minimum). All wire larger
than no. 18 AWG cannot be directly connected at the thermostat
and will require a junction box and splice at the thermostat.
Fig. 47 — Field Control Thermostat Wiring
Variable Air Volume Units
The 48N units may be used in applications with additional control
features, options, or accessories. Refer to the appropriate accesso-
ry installation instructions for more information on installing that
accessory. Refer to the Controls and Troubleshooting manual for
more information concerning installation and configuration of op-
tions and accessories. Control options and accessories available
for Variable Air Volume (VAV) units are:
• thermostats
• differential enthalpy sensor
• return air humidity sensor
• outdoor air humidity sensor
• relative humidity space sensor
• CO
2
sensors
• fan status switch
• filter pressure transducer
• return smoke detector
• CEM (controls expansion module)
• EXB (economizer control board) module
VAV CONTROL WIRING
The recommended types of control wiring are shown below:
SENSORS
Sensors should be wired using single twisted pairs of 20 AWG
(American Wire Gage) conductor cable rated for the application,
except for the T-56 accessory sensor which requires 3-conductor
cable.
HUMIDITY CONTROL AND HOT WATER AND STEAM
VALVES
These devices require 20 AWG twisted pair conductor cables rat-
ed for the application for the 4 to 20 mA signal.
OPTION CONTROL TUBE NUMBER
Return Air Fan RACFM Control PPSS 4, 5 and 6
Power Exhaust Fan
with CFM Sensor
EACFM Control 5 and 6
SIDE POST
FAR SIDE ONLY
SIDE
PANEL
BRACKETS
SIDE
PANEL
MANUFACTURER
PART NO.
Regular Wiring Plenum Wiring
Alpha 1895 —
American A21451 A48301
Belden 8205 884421
Columbia D6451 —
Manhattan M13402 M64430
Quabik 6130 —
R
Y1 Y2 W1 W2 G
R
Y1 Y2 W1 W2 G
FIELD SUPPLIED THERMOSTAT
RC
TB201
XC
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