N80ESN/N80ESL(Series A): Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
19
The 24-v circuit contains an automotive-type, 3-amp. fuse located on the
control. Any direct shorts during installation, service, or maintenance
could cause this fuse to blow. If fuse replacement is required, use ONLY
a 3-amp. fuse of identical size.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used) using 1/4-in
female quick connect terminals to the two male 1/4-in
quick-connect terminals on the control board marked EAC-1 and
EAC-2. The terminals are rated for 115 VAC, 1.0 amps maximum
and are energized during blower motor operation (see
).
2. Humidifier (HUM)
a. 24VAC HUM: Connect an accessory 24 VAC, 0.5 amp
maximum humidifier (if used) to the 1/4-in male quick-connect
24VAC HUM terminal and C screw terminal on the control
board thermostat strip. The 24VAC HUM terminal is energized
when there is a call for heat (W) and the pressure switch (PRS)
closes (see
).
b. HUM: Connect an accessory 115VAC (EAC and HUM are 1
amp maximum combined) humidifier (if used) to the
¼
-inch
male quick connect HUM terminal and EAC-2
¼
-inch quick
connect. The HUM terminal is energized when the inducer
).
NOTE:
A field-supplied, 115-v controlled relay connected to EAC
terminals may be added if humidifier operation is desired during blower
operation.
NOTE:
DO NOT connect furnace control 24VAC HUM terminal to H
(humidifier) terminal on humidity sensing thermostat, or similar device.
See humidity sensing thermostat, thermostat, or controller
manufacturer’s instructions for proper connection.
A190022
Fig. 28 – Furnace Control
A190085
Fig. 29 – Thermostat Wiring Diagrams
24-V THERMOSTAT
TERMINALS
P2
–
(115VAC) HOT SURFACE IGNITER &
INDUCER MOTOR 115V SUPPLY CONNECTOR
115-VAC (L2) NEUTRAL
CONNECTIONS
115-VAC (BL-1) BLOWER MOTOR LINE
VOLTAGE CONNECTION
EAC-1 TERMINAL
(115-VAC 1.0 AMP MAX.)
P1
–
LOW VOLTAGE MAIN HARNESS
CONNECTOR
TRANSFORMER 24-VAC
CONNECTIONS
3-AMP FUSE
STATUS LED LIGHT
HEAT OFF-DELAY
HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX.)
BOARD PART NUMBER
LOCATION
COOLING SPEED
TAP
HEATING SPEED
TAP
XFMR
115-VAC (PR-1) TRANSFORMER
PRIMARY
J2 DEFEAT
JUMPER
TEST/TWIN
J2
HEAT OFF-DELAY
JUMPER SELECT
L1
PLT -FACTORY RUN TEST PORT
PRODUCTION USE ONLY
BL-1
115-VAC (L1) LINE VOLTAGE
CONNECTION
FAN SPEED TAP
J1
HUM
Single-Stage Furnace with Single-Speed Air Conditioner
Single-Stage Furnace with Single-Speed Heat Pump
THERMOSTAT
THERMOSTAT
*
*
D
D
See notes 1 and 4
See notes 1 and 3