Proper Gas Flow; Repair Parts Listing - Lennox LGH036, LGH048, LGH060, LGH072, LGH074 Installation Instructions Manual

Proper Gas Flow (Approximate)
1- Operate unit at least 15 minutes before checking gas
flow. Determine the time in seconds for two revolutions
of gas through the meter. (Two revolutions assures a
more accurate time.) A portable LP gas meter (17Y44)
is available for LP applications.
2- Divide the number of seconds by two and compare to
the time in table 6. If manifold pressure is correct and
rate is incorrect, check gas orifices for proper size and
restriction.
3- Remove temporary gas meter if installed.
NOTE - To obtain accurate reading, shut off all other gas
appliances connected to meter.

Repair Parts Listing

When ordering repair parts, include the complete model number and serial number listed on the ETL/CSA rating plate -
e.g. LGH120S4BH1Y.
Gas Heat Section Parts
Heat Exchanger
Combustion Air Assembly
Combustion Air Proving Switch
Burner Assembly
Burner Manifold Assembly
Main Burner Orifices
Flame Roll-out Switches
Auxiliary Limit Controls
Ignition Electrode Assembly
Ignition Lead
Ignition Sensor Assembly
Sensor Lead
Combination Gas Valve
Limit Controls
Additional for ULNOx Units:
Intake Air Screen
Intake Air Orifice
Air/Gas Elbow
Air/Gas Plenum Box
Burner Premix Plate
Burner Box Liner & Tubes
Inlet Reducer
Rubber Coupling
LGH036-360 Agency
NOTE - Table assumes standard temperature (60°F),
Cooling Parts
Compressors
Condenser Fan Motors
Condenser Fan Blades
Condenser Fan Run Capacitors
Freezestats
Condenser Fan Mounting Bracket
Fan Grille
Indoor Blower Motors
Blower Wheel
Expansion Valve
Distributor
Exhaust Fans (Opt.)
Reversing Valve (KD only)
Page 8
TABLE 6
GAS METER CLOCKING CHART
Unit Seconds for One Revolution
Input
Natural
Rate
(Btuh)
1 cu ft
Dial
65,000 55
78,000 46
108,000 33
125,000 29
130,000 28
150,000 24
169,000 21
180,000 20
240,000 15
260,000 14
360,000 10
480,000 8
Natural-1000 btu/cu ft LP-2500 btu/cu ft
pressure (30in.Hg.), and fuel heating values
(Btuh/Ft.3). Apply pressure corrections in alti-
tudes above 2000 ft.
Electrical Control Parts
Compressor Contactors
Circuit Breakers (Opt.)
Transformer (Control)
Transformer (Contactor)
Blower Contactor
Limit, Blower Relay
Heat Relays
Condenser Fan Relays
Capacitor CAB
Relay CAB
Disconnect Switch (Opt.)
Defrost Control (KD only)
Fan Control Board (KD only)
LP
2 cu ft 1 cu ft 2 cu ft
Dial Dial Dial
111 138 277
92 115 231
67 83 167
58 72 144
55 69 138
48 60 120
43 53 107
40 50 100
30 38 75
28 35 69
20 30 50
15 19 38