Electrical Connections; Unit Start-Up - Lennox ECB38 Series Installation Instructions Manual

• Sends discharge temperature status message when
operating in EVENHEAT mode.
• Sends discharge air sensor temperatures to be dis-
played on the Air Handler Control when operating in
EVENHEAT mode
The discharge air sensor should be mounted downstream
of the electric heat elements and indoor air handler as il-
lustrated in figure 1, detail C. It must be placed in a lo-
cation with unobstructed airflow, where other accessories
(such as humidifiers, UV lights, etc.) will not interfere with
its accuracy

Electrical Connections

IMPORTANT
USE COPPER CONDUCTORS ONLY
NOTE - Refer to the nameplate on the air handler unit
for minimum circuit ampacity and maximum overcurrent
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.
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.
AIR HANDLER CONTROL 9-PIN CONNECTOR
Wiring connections between the air handler and the
ECB38 electric heat section are made with an eight wire
harness. See table 1 for wire designations.
TABLE 1. Electric Heat Connectors
Position Function / Description
1 Heat stage 1 relay coil
2 Heat stage 2 relay coil
3 Relay coil return
4 Heat stage 3 relay coil
5 Heat stage 4 relay coil
6 Heat stage 5 relay coil
7 L1 230VAC supply from heater kit
8 L2 230 VAC supply from heater kit
9 Not Used

Unit Start-Up

1 - Use speed tap selection charts in tables 2 and 3 to
set air handler blower speed.
TABLE 2. Recommended Blower Speed Tap Selection
BLOWER
COIL
AC
COOL
-018
PIN #2
COOL
-024
PIN #3
COOL
-030
PIN #3
COOL
-036
PIN #3
COOL
-042
PIN #3
COOL
-048
PIN #2
COOL
-060
PIN #3
TABLE 3. Recommended Blower Speed Tap Selection
MIX MATCH SPEED TAP SELECTION
BLOWER
COIL
AC
COOL
-042 with
PIN #1
2-ton HP
minus
COOL
-048 with
PIN #1
3-ton HP
minus
2 - Restore power to the unit with room thermostat set
to OFF.
3 - Unit can be configured in either Standard Heat or
EVENHEAT Mode. See Configuring/Detecting Heat
Section flow diagram on page 12 for set up.
4 - Affix the wiring diagram sticker to blower scroll
aligned with CB unit wiring diagram sticker.
5 - The air handler access panels are factory supplied,
and they have a patch plate over the circuit breaker
opening. Remove the circuit breaker patch plate
from the air handler access panel.
6 - Replace the air handler compartment access cover.
7 - Choose the appropriately sized adhesive-backed
circuit breaker seal and remove any perforated
sections (if needed). Apply the seal to the outside of
the air handler access panel so that the seal is snug
around the circuit breakers (see figure 4).
8 - Break the patch plate for the specific size of electric
heat unit / air handler unit that you are installing as
illustrated in figure 5. Discard the unused piece of
patch plate.
9 - Secure the patch plate on the air handler access door.
10 - Set the thermostat to desired setting.
Page 6
SPEED TAP SELECTION
COOL
AC WITH
HP ELECTRIC
HEAT
HEAT
COOL
PIN #4
PIN #2
minus
HEAT
COOL
PIN #4
PIN #3
minus
COOL HEAT
PIN #3 PIN #3
COOL HEAT
PIN #3 PIN #3
COOL HEAT
PIN #3 PIN #3
COOL HEAT
PIN #2 PIN #2
COOL HEAT
PIN #3 PIN #3
COOL
AC WITH
HP ELECTRIC
HEAT
COOL HEAT
PIN #1 PIN #1
minus minus
COOL HEAT
PIN #1 PIN #1
minus minus
HEAT
HP WITH
ELECTRIC
HEAT
HEAT
PIN #4
minus
HEAT
PIN #4
minus
HEAT
PIN #3
HEAT
PIN #3
HEAT
PIN #3
HEAT
PIN #2
HEAT
PIN #3
HEAT
HP WITH
ELECTRIC
HEAT
HEAT
PIN #1
minus
HEAT
PIN #1
minus