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Addendum to Installation Instructions For ML180UHE,

ML180DFE, ML193UHE, ML193DFE, ML196UHE & ML196DFE

508141-01

01/2021

ADDENDUM

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.

TABLE 1

Units Model

Allowed Continuous Air

Speed Tap

ML180UHE All Red

ML180DFE All Red

ML193UHE All Red

ML193DFE All Red

ML196UHE All Red

ML196DFE All Red

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.

Lennox ML180UHE - Page 16

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