Lennox G51MP?48C?110 User Manual

Page 37
SET DIAL TO
MEASURE VDC
(+)
(−)
(−) TO
FLAME
SENSOR
NOTE−MUST USE DIGITAL METER
RED COLLAR
INDICATES
POSITIVE
LEAD
(+) TO
IGNITION
CONTROL
SENSOR
WIRE
FIGURE 45
TRANSDUCER
PART #78H5401
TABLE 20
Flame Signal in Microamps
Ignition Control Normal Low Drop Out
69M15  0.31 0.25 − 0.30  0.24
97L48  0.61 0.21 − 0.60  0.20
J−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 21 for
proper manifold pressure settings at varying altitudes.
Table 22 lists required pressure switch changes and con-
version kits at varying altitudes.
The combustion air pressure switches are factory−set and
require no adjustment.
NOTE − Pressure switch is factory set. No adjustment necessary. All mod-
els use the factory installed pressure switch from 0−4500 feet (0−1370 m).
TABLE 21
Manifold Pressure (Outlet) inches w.c.
Model
Altitude (feet)
Fuel
Model
Input
Sizes
0−
4500
4501−
5500
5501−
6500
6501−
7500
7501−
10,000
Nat.
Gas
045, 070,
090, 110,
135
3.5 3.5 3.5 3.5 3.5*
Gas
135−1, −2
3.5 3.3 3.2 3.1 3.5*
L.P.
Gas
All sizes
10.0** 10.0** 10.0** 10.0** 10.0**
*Conversion kit required for applications at altitudes above 7501 ft.
above sea level.
**Conversion kit required for applications at all altitudes.
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.
TABLE 22
Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Altitude
Model
Input
Si
Gas
0 − 4500 ft.
(0 − 1372 m)
4,501 − 7500 ft.
(1373 − 2286 m)
7501−10,000 ft.
(2287 − 3048 m)
Input
Size
Gas
Required Pressure Required Pressure Required Pressure
Required
Conversion Kit
Pressure
Switch
Required
Conversion Kit
Pressure
Switch
Required
Conversion Kit
Pressure
Switch
045/070 1 to 6
Nat. N/A No Change N/A No Change 59M16 56M06
045/070−1 to −6
LPG 83M74 No Change 83M74 No Change 83M75 56M06
045/070 7 and later
Nat. N/A No Change N/A No Change 59M17 95M22
045/070−7 and later
LPG 83M74 No Change 83M74 56M05 83M75 56M06
090 1 to 6
Nat. N/A No Change N/A 75M20 59M16 56M07
−090−1 to −6
LPG 83M74 No Change 83M74 75M20 83M75 56M07
090 7 and later
Nat. N/A No Change N/A 75M20 59M17 56M07
−090−7 and later
LPG 83M74 No Change 83M74 75M20 83M75 56M07
110 1 to 6
Nat. N/A No Change N/A 75M20 59M16 56M07
−110−1 to −6
LPG 83M74 No Change 83M74 75M20 83M75 56M07
110 7 and later
Nat. N/A No Change N/A 75M20 59M17 56M07
−110 −7 and later
LPG 83M74 No Change 83M74 75M20 83M75 56M07
135 1 2
Nat. N/A No Change N/A 56M04 47M82 60M35
−135−1, −2
LPG 83M74 No Change 83M74 56M04 83M75 60M35
135 3 to 6
Nat. N/A No Change N/A 56M04 59M16 60M35
−135−3 to −6
LPG 83M74 No Change 83M74 56M04 83M75 60M35
135 3 to 6
Nat. N/A No Change N/A 56M04 59M16 60M35
−135−3 to −6
LPG 83M74 No Change 83M74 56M04 83M75 60M35
135 7 and later
Nat. N/A No Change N/A 56M04 59M17 60M35
−135−7 and later
LPG 83M74 No Change 83M74 56M04 83M75 60M35

Lennox G51MP?48C?110 Specifications

General

Brand	Lennox
Model	G51MP?48C?110
Category	Furnace
Language	English