Electrical Connections; Use Copper Conductors Only - Lennox ECB29 Series Installation Instructions Manual

Circuit Breaker Cover Installation
If the air handler is installed in an unconditioned space the
provided circuit breaker cover must be installed.
1 - Use isopropyl alcohol to clean the surface that
the circuit breaker cover will be attached to.
FIGURE 7. Circuit Breaker Location
2 - Remove paper backing from foam seal around
perimeter of circuit breaker cover (figure 8).
CIRCUIT BREAKER COVER (BACKSIDE)
REMOVE PAPER BACKING FROM FOAM SEAL
FIGURE 8. Remove Paper Backing
3 - Run a bead of clear silicone around the perimeter of
the circuit breaker cover to seal any gaps between
the cabinet access door and the circuit breaker
cover.
4 - Position the breaker cover over the air handler
circuit breaker opening (figure 9).
FIGURE 9. Circuit Breaker Cover Installation
CIRCUIT BREAKER COVER
Confirm airtight seal between breaker cover and air
handler access panel. Apply a thin silicone bead to the
adhesive back seat to ensure airtight seal.
Failure to seal circuit breaker cover will allow warm
moist air to be pulled into control panel which can create
condensation to form on the circuit breaker and other
electrical components within the control panel.

Electrical Connections

USE COPPER CONDUCTORS ONLY

NOTE – Refer to the nameplate on the air handler unit
for minimum circuit ampacity and maximum over-current
protection size.
The air handler units are provided with openings to be
used with 1-1/2 inch trade size (1-31/32 inch diameter)
conduit. A conduit reducer washer has been provided if
you are installing a smaller sized conduit.
For single-point power supply, refer to the nameplate on
the single-point power supply accessory for minimum cir-
cuit ampacity and maximum over-current 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. Refer
to figure 11 for typical air conditioner applications and fig-
ure 12 for typical heat pump applications with an air han-
dler unit and electric heat section.
Refer to figure 13 for typical system diagram for air han-
dlers with electric heat sections.
Make wiring connections
1 - Disconnect the interface harness from the air
handler unit. Connect the plug from the heater to
the matching plug inside the air handler.
NOTE – 575V, 3-Phase, 60Hz heaters are shipped with
a line-voltage-to-460V transformer. This transformer pro-
vides 460V power to the air handler motor and transformer
only. Disconnect the 2-wire connector from the air handler
interface harness and the air handler transformer. Connect
the 575V to 460V transformer between these connections.
See figure 10 for installation location.
2 - If using
the jumper between terminals W2 and R of TB1
terminal block and connect the second-stage heat
bulb lead to W2.
3 - If using an outdoor thermostat — Remove the
jumper between terminals W2 and R of TB1 terminal
block and connect leads to W2 and R.
Page 5
IMPORTANT
IMPORTANT
a two-stage thermostat—Remove