Making Electrical Connections - Lennox CBA27UHE-018 Installation Instructions Manual

Making Electrical Connections

WARNING
Run 24V Class II wiring only through specified low
voltage opening. Run line voltage wiring only through
specified high voltage opening. Do not combine voltage
in one opening.
CAUTION
USE COPPER CONDUCTORS ONLY.
This unit is provided with knock-outs for conduit. Refer
to figure 11 on page 13 for unit wiring diagram, which in-
cludes all field wiring. Separate openings have been pro-
vided for 24V low voltage and line voltage. Refer to the
dimension illustration on page 2 or 3 for specific location.
Wiring must conform to the current National Electric Code
ANSI/NFPA No. 70, or Canadian Electric Code Part I, CSA
Standard C22.1, and local building codes. Refer to follow-
ing wiring diagrams. See unit nameplate for minimum cir-
cuit ampacity and maximum overcurrent protection size.
Select the proper supply circuit conductors in accordance
with tables 310-16 and 310-17 in the National Electric
Code, ANSI/NFPA No. 70 or tables 1 through 4 in the Ca-
nadian Electric Code, Part I, CSA Standard C22.1.
The motor speed is set by the speed tap connection to
the low voltage terminal strip in the control section. The
speed can be increased by swapping wires as shown in
figure 11.
WIRING CONNECTIONS
1 - Install line voltage power supply to unit from a
properly installed circuit breaker.
2 - Ground unit at unit disconnect switch or to an earth
ground.
NOTE – Connect conduit to the unit using a proper con-
duit fitting. Units are approved for use only with copper
conductors. A complete unit wiring diagram is located on
the back side of the unit's access panel.
3 - Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit.
NOTE – For proper voltages, select thermostat wire gauge
per the following chart:
TABLE 6. Run Length (Class II Rated Wiring)
Wire Run Length
Less than 100' (30m)
More than 100' (30m)
Install room thermostat (ordered separately) on an inside wall
approximately in the center of the conditioned area and 5 feet (1.5m)
from the floor. It should not be installed on an outside wall or where it
can be affected by sunlight or drafts.
THERMOSTAT
5 FEET
(1.5M)
cuit connections are made in
the control panel.
NOTE — Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
FIGURE 10. Thermostat Installation
Page 12
AWG # Insulation / Core Types
Color coded, temperature
18
rating 95°F (35°C)
16
minimum, solid core