Lennox International Inc G61MP specifications High Altitude, Condensate pH Range

TABLE 17

High Heat

Unit		CO2% For Nat	CO2% 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		CO2% For Nat	CO2% 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
Increasing 2		Vinegar	G61 Condensate
Acidity	3	Wine
	4	Orange Juice	pH Range

5Tomato Juice

6

7 Tap Water

8

Increasing 9

Alkalinity 10

11

TABLE 19

Conversion Kit Requirements and Manifold Pressures

				Altitude				Manifold Pressure at all
									altitudes
Model		0−4500 ft.		4501−7500 ft.		7501−10,000		Low Fire		High Fire
Input	Gas	(0−1372 m)		(1373−2286 m)		(2287−3048 m)
Size
		Required	Pressure	Required	Pressure	Required	Pressure	in.		in.
		Conversion		Conversion		Conversion			kPa		kPa
			Switch		Switch		Switch	w.c.		w.c.
		Kit		Kit		Kit
	Nat	N/A	No Change	N/A	No Change	59M16	No Change	1.7	0.42	3.5	0.87
−045
	LPG	59M13	No Change	59M13	No Change	59M14	No Change	4.9	1.22	10.0	2.5
	Nat	N/A	No Change	N/A	No Change	59M16	56M06	1.7	0.42	3.5	0.87
−070
	LPG	59M13	No Change	59M13	No Change	59M14	56M06	4.9	1.22	10.0	2.5
	Nat	N/A	No Change	N/A	75M22	59M16	56M21	1.7	0.42	3.5	0.87
−090
	LPG	59M13	No Change	59M13	75M22	59M14	56M21	4.9	1.22	10.0	2.5
	Nat	N/A	No Change	N/A	No Change	59M16	No Change	1.7	0.42	3.5	0.87
−110
	LPG	59M13	No Change	59M13	No Change	59M14	No Change	4.9	1.22	10.0	2.5
	Nat	N/A	No Change	N/A	59M93	59M16	56M93	1.7	0.42	3.5	0.87
−135
	LPG	59M13	No Change	59M13	59M93	59M14	56M93	4.9	1.22	10.0	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).

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