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G51MP
Lennox G51MP User Manual
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Page 8
G51MP P
ARTS IDENTIFICA
TION
FIGURE 1
TOP CAP
CABINET
BURNER BOX
ASSEMBL
Y
SIGHT
GLASS
DuralokPlus
TM
HEA
T EXCHANGER
ASSEMBL
Y
CONDENSER COIL
CONTROL BOX
DOOR
INTERLOCK
SWITCH
COLD HEADER
(COLLECTOR)
BOX
COMBUSTION AIR
INDUCER
BLOWER
ACCESS
DOOR
BURNER
ACCESS
P
ANEL
FLUE
COLLAR
COMBUSTION
AIR
PROVE
SWITCHES
PRIMARY LIMIT
W
ARM HEADER
(COLLECTOR)
BOX
GAS V
AL
VE
AND MANIFOLD
SECONDARY LIMITS
BURNER BOX
COVER
7
9
Table of Contents
Table of Contents
1
General
1
Specifications
2
Optional Accessories
3
Blower Performance Data
4
G51Mp−36C/48C−090 Performance
5
G51Mp−48C−110 Performance
5
G51MP Parts Identification
8
B−Control Box Components
9
A−Make-Up Box
9
Circuit Breaker (CB8)
9
I−Unit Components
9
Surelight Integrated Ignition Control 97L48 (A92)
10
Fan-Off Time Adjustment
11
Integrated Ignition Control 97L48
11
Surelight Control Ignition Sequence
11
Surelight Integrated Ignition Control 69M15 (A92)
12
Diagnostic Codes
14
Ignitor
14
Flame Sensor
15
Primary Limit Control
15
Burners
15
Clamshell Heat Exchanger
16
Backup Secondary Limit Control (S113) (G51MP−090, 110, 135 Only)
16
Gas Valve (GV1)
16
Combustion Air Inducer (B6)
17
Combustion Air Prove Switch (S18)
17
Blower Motor (B3) and Capacitor (C4)
18
Secondary Limit Controls (S21)
18
D−Blower Compartment
18
Outdoor Termination Kits and Corresponding Equivalencies
19
Placement and Installation
19
A−Vent Piping Guidelines
20
Maximum Vent Pipe Lengths Direct Vent (2 Pipe)
21
Maximum Vent Pipe Lengths Non-Direct (1 Pipe)
21
B−PVC Joint Cementing Procedure
22
C− Venting Practices
23
Exhaust Pipe Offset
23
Typical Air Intake Pipe Connections
26
Vent Termination Clearances for Installations in the USA and Canada
28
Front View
30
Condensate Trap Locations
32
Start−Up
33
Preliminary and Seasonal Checks
33
Heating Start-Up
33
C.S.A. Certification
34
Gas Piping
34
Testing Gas Piping
34
Heating System Service Checks
34
Testing Gas Supply Pressure
35
Proper Gas Flow (Approximate)
36
Proper Combustion
36
Condensate Ph Range
36
Flame Signal
36
High Altitude
37
Conversion Kit and Pressure Switch Requirements at Varying Altitudes
37
Manifold Pressure (Outlet) Inches W.C.
37
Blower Operation and Adjustment
38
Temperature Rise
38
External Static Pressure
38
Typical Operating Conditions
38
Maintenance
39
Cleaning Heat Exchanger
40
Wiring Diagram and Sequence of Operation
42
Integrated Ignition Control Troubleshooting Chart
48
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Lennox G51MP Specifications
General
Efficiency
80% AFUE
Blower Motor
PSC
Fuel Type
Natural Gas or Propane
Warranty
5-Year Limited Warranty on covered components
Heating Capacity
44, 000 to 132, 000 BTUH
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