Lennox G40UH Series User Manual

Page 35
Troubleshooting
CONTINUOUS HEAT SPEED FAN SEQUENCE OF OPERATION
LED: SLOW FLASH RATE REMAINS
UNCHANGED THROUGHOUT SEQUENCE.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT
SPEED. EAC TERMINAL IS ENERGIZED.
THERMOSTAT CALLS FOR HEAT (W).
THERMOSTAT CALLS FOR COOLING.
THERMOSTAT OPENS.
SYSTEM FAN SWITCHED TO COOL SPEED.
EAC TERM. REMAINS ON.
THERMOSTAT OPENS.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT
SPEED. EAC TERM. ENERGIZED.
NO
YES
YES
NO
HUM TERM. ENERGIZES
WITH COMB. AIR INDUCER.
SYSTEM FAN REMAINS ON
HEATING SPEED.
SYSTEM FAN REMAINS ON
HEATING SPEED.
HUM TERM. DE−ENERGIZES
WITH COMB. AIR INDUCER
G40UH(X) Start−Up & Performance Check List
Filter Clean & Secure?
Electrical Connections Tight?
Job Name
Job Location
Installer
Unit Model No.
Furnace Btu Input Line Pressure
Job No.
City
City
Serial No.
Date
State
Technician
Flue Connections Tight?
Heating Section
Thermostat
Calibrated? Heat Anticipator Properly Set? Level?
Fuel Type: Natural Gas?
Blower Motor H.P.
Gas Piping Connections Tight & Leak−Tested?
Proper Draft?
Vent Clear?
State
Temperature Rise
Fan Control Off Setting
Fan Control Setting (45 Seconds Fixed On)
Regulator Pressure w.c. − Nat.:
LP/Propane Gas?
Combustion Gas Tested? CO
2
CO
Supply Voltage
Blower Motor Amps
w.c. − LP/Propane

Lennox G40UH Series Specifications

General

Type	Gas Furnace
Efficiency	80% AFUE
Heating Stages	Single-stage
Ignition System	Hot Surface Ignition
Vent Type	Conventional Venting
Blower Motor	PSC
Cabinet Width	17.5 inches
Warranty	5-Year Parts
Fuel Type	Natural Gas
Heating Capacity	44, 000 to 132, 000 BTU/h