Step 3 - Install Sensors And Make Field; Or Ddc (Direct Digital Controls) - Carrier 35E Installation And Start-Up Instructions Manual

Step 3 — Install Sensors and Make Field Wiring
Connections — Electric Analog or DDC (Direct
Digital Controls)
Refer to specific unit dimensional submittals and control ap-
plication diagrams for control specifications. All field wiring
must comply with National Electrical Code (NEC) and local
requirements. Refer to the wiring diagram on the unit for spe-
cific wiring connections.
A field-supplied transformer is required if the unit was not
equipped with a factory-installed transformer. See Fig. 5.
Single duct terminal units with electric heat are supplied with
a single point wiring connection in the heater control box. All
unit power is supplied through this connection. Models with
electric heat are factory equipped with a control transformer.
See Fig. 6.
Wiring and unit ampacities are referenced in Tables 3 and 4.
NOTE: Refer to wiring diagram attached to each unit for specific
information on that particular unit. Units with 480-3-60 electric
heater REQUIRE 4-wire, WYE connected power. Units with
208/230 v, 3-phase heater can be connected with 3-wire power.
Unit airflow should not be set outside of the range noted in
Fig. 7. The minimum recommended airflow for units with
electric heat must be at least 75 cfm per kW and must not
drop below the minimum values listed in the performance
data table. The maximum unit discharge temperature should
not exceed 120°F. Prevent air stratification by setting the dis-
charge temperature no more than 15 degrees above the room
temperature. Example: 90°F discharge in a 75°F room.
LEGEND
AFS — Airflow Switch
DDC — Direct Digital Controls
NOTE: Drawing is typical of 480V,
3-phase, 4-wire heater and control.
Refer to actual unit wiring diagram.
Fig. 6 — Typical Power Connections for 35E Units with 3-Stage Electric Heat
120VAC
208VAC
240VAC
277VAC
CLASS II
TRANSFORMER
(OPTIONAL)
24VAC
GROUND
LEGEND
DDC — Direct Digital Controls
Field Wiring
Factory Wiring
NOTE: Drawing is typical — refer to actual unit wiring diagram
for details.
Fig. 5 — Wiring of Optional Factory-Mounted
6
L1
ANALOG OR DDC
CONTROLLER
24 VAC
POWER
BLU
YEL
Transformer
ANALOG
OR DDC
CONTROLLER
SEPARATE
CONTROL
ENCLOSURE