Lennox G61MP Series Unit Information

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TABLE 17
High Heat
Unit CO
2
%
For Nat
CO
2
%
For L.P.
G61MP−36B−045 6.5 − 7.5 7.4 − 8.4
G61MP−36B−070 6.5 − 7.5 7.4 − 8.4
G61MP−48C−090 6.9 − 7.9 7.8 − 8.8
G61MP−60C−090 6.9 − 7.9 7.8 − 8.8
G61MP−48C−110 7.2 − 8.2 8.1 − 9.1
G61MP−60C−110 7.2 − 8.2 8.1 − 9.1
G61MP−60D−135 7.4 − 8.4 8.3 − 9.3
TABLE 18
Low Heat
Unit CO
2
%
For Nat
CO
2
%
For L.P.
G61MP−36B−045 4.8 − 5.8 5.3 − 6.3
G61MP−36B−070 4.8 − 5.8 5.3 − 6.3
G61MP−48C−090 5.1 − 6.1 5.9 − 6.9
G61MP−60C−090 5.1 − 6.1 5.9 − 6.9
G61MP−48C−110 5.3 − 6.3 6.1 − 7.1
G61MP−60C−110 5.3 − 6.3 6.1 − 7.1
G61MP−60D−135 5.7 − 6.7 6.7 − 7.7
H− High Altitude
NOTE − In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local au-
thorities.
The manifold pressure may require adjustment to ensure
proper operation at higher altitudes. Refer to table 19 for
proper manifold pressure settings at varying altitudes and
required pressure switch changes and conversion kits at
varying altitudes.
The combustion air pressure switches are factory−set and
require no adjustment.
NOTE − A natural to L.P. propane gas changeover kit is nec-
essary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.
I− Condensate pH Range
The condensate is mildly acidic and can be measured with
pH indicators. The pH scale is a measurement of acidity
and alkalinity. The following scale shows the relative pH of
some common liquids as compared with condensate of
G61MP units. The concentration of the acidity of all these
fluids including the condensate is very low and harmless.
pH RANGE
0
1
2
3
4
5
6
7
8
9
10
11
Vinegar
Wine
Orange Juice
Tomato Juice
Tap Water
G61 Condensate
pH Range
Increasing
Acidity
Increasing
Alkalinity
TABLE 19
Conversion Kit Requirements and Manifold Pressures
Altitude
Manifold Pressure at all
altitudes
Model
Input
Size
Gas
0−4500 ft.
(0−1372 m)
4501−7500 ft.
(1373−2286 m)
7501−10,000
(2287−3048 m)
Low Fire High Fire
Size
Required
Conversion
Kit
Pressure
Switch
Required
Conversion
Kit
Pressure
Switch
Required
Conversion
Kit
Pressure
Switch
in.
w.c.
kPa
in.
w.c.
kPa
−045
Nat
LPG
N/A
59M13
No Change
No Change
N/A
59M13
No Change
No Change
59M16
59M14
No Change
No Change
1.7
4.9
0.42
1.22
3.5
10.0
0.87
2.5
−070
Nat
LPG
N/A
59M13
No Change
No Change
N/A
59M13
No Change
No Change
59M16
59M14
56M06
56M06
1.7
4.9
0.42
1.22
3.5
10.0
0.87
2.5
−090
Nat
LPG
N/A
59M13
No Change
No Change
N/A
59M13
75M22
75M22
59M16
59M14
56M21
56M21
1.7
4.9
0.42
1.22
3.5
10.0
0.87
2.5
−110
Nat
LPG
N/A
59M13
No Change
No Change
N/A
59M13
No Change
No Change
59M16
59M14
No Change
No Change
1.7
4.9
0.42
1.22
3.5
10.0
0.87
2.5
−135
Nat
LPG
N/A
59M13
No Change
No Change
N/A
59M13
59M93
59M93
59M16
59M14
56M93
56M93
1.7
4.9
0.42
1.22
3.5
10.0
0.87
2.5
Pressure switch is factory set. No adjustment necessary. All models use the factory installed pressure switch from 0−4500 feet (0−1370 m).

Lennox G61MP Series Specifications

General

Brand	Lennox
Model	G61MP Series
Category	Furnace
Language	English