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 Wir-
ing Connections — Electric Analog or DDC
(Direct Digital Controls) —
mensional submittals and control application diagrams for con-
trol specifications. All field wiring must comply with National
Electrical Code (NEC) and local requirements. Refer to the
wiring diagram on the unit for specific wiring connections.
A field-supplied transformer is required if the unit was not
equipped with a factory-installed transformer. See Fig. 4.
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 trans-
former. See Fig. 5.
Wiring and unit ampacities are referenced in Tables 3 and 4.
NOTE: Refer to wiring diagram attached to each unit for spe-
cific 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. 6. The minimum recommended airflow for units with elec-
tric heat must be at least 75 cfm per kW and not drop below the
minimum values listed in the performance data table. The max-
imum unit discharge temperature should not exceed 120°F.
Prevent air stratification by setting the discharge 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. 5 — Typical Power Connections for 35E Units with 3-Stage Electric Heat
Refer to specific unit di-
L1
120VAC
208VAC
240VAC
277VAC
CLASS II
TRANSFORMER
(OPTIONAL)
24VAC
GROUND
BLU
YEL
LEGEND
DDC — Direct Digital Controls
Field Wiring
Factory Wiring
NOTE: Drawing is typical — refer to actual unit wiring diagram
for details.
Fig. 4 — Wiring of Optional Factory-Mounted
5
ANALOG OR DDC
CONTROLLER
24 VAC
POWER
Transformer
ANALOG
OR DDC
CONTROLLER
SEPARATE
CONTROL
ENCLOSURE