Lennox ML180UHE Installation Instructions Manual

Addendum to Installation Instructions For ML180UHE,
ML180DFE, ML193UHE, ML193DFE, ML196UHE & ML196DFE
This document supersedes any similar/conflicting
instructions found in this bag assembly.
Application
This furnace is designed for single stage heating and
single stage cooling/heat pump application only.
Although equipped with two stage ignition control, wiring
on this unit is strictly configured for single stage
application. Unless allowed by this document, do not
change wiring connections and never cut 2 stage
compressor jumper W915 on the ignition control.
Indoor Blower Speeds (Diagram Figure 1)
For heating operation, control uses indoor blower motor
speed tap connected to "Low Heat" terminal on the
ignition control. See table 2 for allowable heating speed
taps to meet DOE requirements for Fan Energy Rating
and OEM recommended temperature rise range.
Speed tap connected to "high heat" terminal is used for
heating operation only if control finds indoor blower motor
already running when heat is called upon. Therefore,
there must always be an allowable heating motor speed
tap connected to the "High Heat" terminal of the ignition
control.
For Cooling/Heat Pump operation, control uses indoor
blower motor speed tap connected to the "High Cool"
.
terminal
Indoor blower motor speed tap connected to "Low Cool"
terminal is used only for continuous air. Control energizes
"Low Cool" terminal for continuous air only when dip
switches are appropriately set to do so (6 "OFF", & 7
"ON").
In order to meet DOE issued July 2019 indoor blower
requirements to meet Fan Energy Ratings, following
motor speed taps must be connected to "Low Cool"
terminal located on Ignition Control. Additionally, per table
7, Dip Switch 6 located on Ignition Control must be in
"OFF" and Dip Switch 7 must be in "ON" position. See
table 1 for speed tap allowed for continuous air.
508141-01
01/2021
Units
ML180UHE
ML180DFE
ML193UHE
ML193DFE
ML196UHE
ML196DFE
On-Board Links and Diagnostic Push
Button (Figure 2)
On-Board Link W914 Dehum - DO NOT CUT
On-board link W914, the connection between R & DS,
must NOT be cut, as this furnace is strictly designed for 1
stage compressor application only and is NOT designed
to operate in dehumidification mode
On-Board Link W951 Heat Pump (R to O)
On-board link W951 is a clippable connection between
terminals R and O on the integrated control. W951 must
be cut when the furnace is installed in applications which
include a heat pump unit and a thermostat which features
dual fuel use. If the link is left intact, terminal "O" will
remain energized eliminating the HEAT MODE in the heat
pump.
On-Board Link W915 2 Stage Compr (Y1 to Y2)
[ DO NOT CUT]
On-board link W915 is a connection between terminals
Y1 and Y2 on the integrated control. W915 must NOT be
cut, as this furnace is strictly designed for 1 stage
compressor application.
Page 1
ADDENDUM
TABLE 1
Allowed Continuous Air
Model
Speed Tap
All Red
All Red
All Red
All Red
All Red
All Red
.