Lennox G60UHV User manual

Page 1 ©2003 Lennox Industries Inc.
Corp. 0124−L11 G60UHV(X)
Service Literature Revised 1−2009
G60UHV(X) SERIES UNITS
G60UHV(X) series units are mid−efficiency gas furnaces
used for upflow or horizontal applications only, manufac-
tured with Lennox Duralok Plus heat exchangers formed of
aluminized steel. G60UH(X) units are available in heating
capacities of 66,000 to 132,000 Btuh and cooling applica-
tions up to 5 tons. Refer to Engineering Handbook for prop-
er sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. G60UH(X) model
units are equipped with the Two−Stage / Variable Speed Inte-
grated SureLight control. G60UH(X) unit meets the Califor-
nia Nitrogen Oxides (NOx) Standards and California Sea-
sonal Efficiency requirements. All units use a redundant gas
valve to assure safety shut−off as required by C.S.A.
All specifications in this manual are subject to change. Pro-
cedures outlined in this manual are presented as a recom-
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti-
tute code.
TABLE OF CONTENTS
Introduction Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications Page 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components Page 9. . . . . . . . . . . . . . . . . . . . . . . .
II Installation Page 32. . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up Page 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks Page 33. . . . . . . . .
V Typical Operating Characteristics Page 35. . . . . . . . .
VI Maintenance Page 36. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 38. . . . . .
VIII Field Wiring and Jumper Settings Page 53. . . . . . .
IX Troubleshooting Page 58. . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer, service agency
or the gas supplier.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.

Page 2
SPECIFICATIONS
Gas
Heating
Performance
ModelNo. G60UHV−36A−070 G60UHV−36B−090 G60UHV−60C−090
Low NOx Model No. G60UHV−36A−070X − − − G60UHV−60C−090X
Input− Btuh (kW) low fire 45,000 (13.2) 60,000 (17.6) 60,000 (17.6)
Output− Btuh (kW) low fire 36,000 (10.5) 48,000 (14.1) 48,000 (14.1)
Input− Btuh (kW) high fire 66,000 (19.3) 88,000 (5.8) 88,000 (25.8)
Output− Btuh (kW) high fire 54,000 (15.8) 72,000 (21.0) 72,000 (21.1)
AFUE 80.0% 80.0% 80.0%
California Seasonal Efficiency 77.2% 77.1% 76.8%
Highstatic(CSA)− in.w.g. (Pa) .80 (200) .80 (200) .80 (200)
Flue connection − in. (mm) round 4 (102) 4 (102) 4 (102)
GaspipesizeIPS− in. (mm) 1/2 (12.7) 1/2 (12.7) 1/2 (12.7)
Temperature rise range − F (C) low fire 20 − 50 (11 − 28) 20 − 50 (11 − 28) 15 − 45 (8 − 25)
Temperature rise range − F (C) high fire 40 − 70 (22 − 39) 40 − 70 (22 − 39) 30 − 60 (17 − 33)
Indoor
Blower
Wheelnominaldiameter xwidth −in. (mm) 10 x 8 (254 x 203) 10 x 8 (254 x 203) 11−1/2 x 10 (292 x 254)
Motoroutput − hp (W) 1/2 (373) 1/2 (373) 1 (746)
Tons(kW) ofadd-oncooling 2 − 3 (7.0 − 10.6) 2 − 3 (7.0 − 10.6) 4 − 5 (14.1 − 17.6)
Shippingweight − 1 package 137 (62) 154 (70) 172 (78)
Matching Coils Up−flow cased C33−18A−2F,
C33−24A−2F,
C33−30A−2F,
C33−36A−2F,
C33−38A−2F
C33−24B−2F,
C33−30B−2F,
C33−36B−2F,
C33−38B−2F,
C33−42B−2F,
C33−48B−2F
C33−36C−2F,
C33−48C−2F,
C33−50/60C−2F,
Horizontal CH33−18A−2F,
CH33−24/30A−2F,
CH33−36A−2F
CH33−36B−2F,
CH33−42B−2F,
CH33−44/48B−2F
CH33−36C−2F,
CH33−48C−2F,
CH33−50/60C−2F
Electricalcharacteristics 120 volts − 60 hertz − 1 phase (less than 12 amps)
OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA
Air Filter and Rack Kit
Number and size of filters
Horizontal (end) 87L95 − (1) 14 x 25 x 1 in.
(356 x 635 x 25 mm)
87L96 − (1) 18 x 25 x 1 in.
(457 x 635 x 25 mm)
87L97 − (1) 20 x 25 x 1 in.
(508 x 635 x 25 mm)
Side Return Single (44J22) or Ten Pack (66K63) − (1) 16 x 25 x 1 in. (406 x 635 x 25 mm)
EZ Filter Base Catalog Number − Shipping Weight 73P55 − 6 lbs. (3 kg) 73P56 − 7 lbs. (3 kg) 73P57 − 8 lbs. (4 kg)
Dimensions − H x W x D 4 x 14−1/4 x 28−5/8 in.
(102 x 362 x 727 mm)
4 x 17−5/8 x 28−5/8 in.
(102 x 448 x 727 mm)
4 x 21−5/8 x 28−5/8 in.
(102 x 549 x 727 mm)
Number and size of filter (field provided) 14 x 25 x 1 in. (356 x
635 x 25 mm)
16 x 25 x 1 in. (406 x
635 x 25 mm)
20 x 25 x 1 in. (508 x
635 x25 mm)
CCB1 Efficiency PlustHumidity Control System 35H00 35H00 35H00
High Altitude Pressure Switch Kit See Page 7
Horizontal Support Frame Kit − Shipping Weight 56J18 − 18 lbs. (8 kg) 56J18 − 18 lbs. (8 kg) 56J18 − 18 lbs. (8 kg)
LPG/Propane Kit See Page 7
RAB Return Air Base − − − − − − RAB60C (12M71)
Vent Adaptor − 6 in. 152 (mm) connection size 18M79 − 2 lbs. (1 kg) 18M79 − 2 lbs. (1 kg) 18M79 − 2 lbs. (1 kg)
Annual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized furnaces.
NOTE − Filters and provisions for mounting are not furnished and must be field provided.
The same C33 uncased models match the furnaces shown but require an optional adaptor base or field fabricated transition. See C33 coil bulletin for additional information.
Cleanable polyurethane frame type filter.
Not for use with RAB Return Air Base or with 60C and 60D size units with 2nd stage heating air flow requirements of 1800 cfm (850 L/s) or greater. See Blower Performance
Tables for additional information.

Page 3
SPECIFICATIONS
Gas
Heating
Performance
ModelNo. G60UHV−60C−110 G60UHV−60D−135
Low NOx Model No. G60UHV−60C−110X − − −
Input− Btuh (kW) low fire 75,000 (22.0) 90,000 (26.4)
Output− Btuh (kW) low fire 60,000 (17.6) 72,000 (21.1)
Input− Btuh (kW) high fire 110,000 (32.2) 132,000 (38.7)
Output− Btuh (kW) high fire 90,000 (26.4) 108,000 (31.6)
AFUE 80.0% 80.0%
California Seasonal Efficiency 77.2% 77.5%
Highstatic(CSA)− in.w.g. (Pa) .80 (200) .80 (200)
Flue connection − in. (mm) round 4 (102) 4 (102)
GaspipesizeIPS− in. (mm) 1/2 (12.7) 1/2 (12.7)
Temperature rise range − F (C) low fire 25 − 55 (14 − 31) 25 − 55 (14 − 31)
Temperature rise range − F (C) high fire 35 − 65 (19 − 36) 45 − 75 (25 − 42)
Indoor
Blower
Wheelnominaldiameter xwidth −in. (mm) 11−1/2 x 10 (292 x 254) 11−1/2 x 10 (292 x 254)
Motoroutput − hp (W) 1 (746) 1 (746)
Tons(kW) ofadd-oncooling 4 − 5 (14.1 − 17.6) 4 − 5 (14.1 − 17.6)
Shippingweight − 1 package 184 (83) 198 (90)
Matching Coils Up−flow cased C33−36C−2F, C33−48C−2F,
C33−50/60C−2F, C33−60D−2F, C33−62D−2F
Horizontal CH33−36C−2F, CH33−48C−2F,
CH33−50/60C−2F CH33−60D−2F, CH33−62D−2F
Electricalcharacteristics 120 volts − 60 hertz − 1 phase (less than 12 amps)
OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA
Air Filter and Rack Kit
Number and size of filters
Horizontal (end) 87L97
(1) 20 x 25 x 1 in. (508 x 635 x 25
mm)
87L98
(1) 25 x 25 x 1 in. (635 x 635 x 25
mm)
Side Return Single 44J22 or Ten Pack (66K63) − (1) 16 x 25 x 1 (406 x 635 x 25)
EZ Filter Base Catalog Number − Shipping Weight 73P57 − 8 lbs. (4 kg) 73P58 − 10 lbs. (5 kg)
Dimensions − H x W x D 4 x 21−5/8 x 28−5/8 in.
(102 x 549 x 727 mm)
4 x 24−5/8 x 28−5/8 in.
(102 x 625 x 727 mm)
Number and size of field provided filter (1) 20 x 25 x 1 in. (508 x 635 x25 mm) (1) 24 x 24 x 1 in. (610 x 610 x 25
mm)
CCB1 Efficiency PlustHumidity Control System 35H00 35H00
High Altitude Pressure Switch Kit See Page 7
Horizontal Support Frame Kit − Shipping Weight 56J18 − 18 lbs. (8 kg) 56J18 − 18 lbs. (8 kg)
LPG/Propane Kit See Page 7
RAB Return Air Base RAB60C (12M71)RAB60D (12M72)
Vent Adaptor − 6 in. 152 (mm) connection size 18M79 − 2 lbs. (1 kg) 18M79 − 2 lbs. (1 kg)
Annual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized furnaces.
NOTE − Filters and provisions for mounting are not furnished and must be field provided.
The same C33 uncased models match the furnaces shown but require an optional adaptor base or field fabricated transition. See C33 coil bulletin for additional information.
Cleanable polyurethane frame type filter.
 Flue connection on the unit is 4 in. (102 mm) diameter. Most applications will require 5 in. (127 mm) venting and field supplied 4 x 5 in. (102 x 127 mm) adaptor. See Venting
Tables in the Installation Instructions for detailed information.
Not for use with RAB Return Air Base or with 60C and 60D size units with 2nd stage heating air flow requirements of 1800 cfm (850 L/s) or greater. See Blower Performance
Tables for additional information.

Page 4
BLOWER DATA
G60UHV−36A−070 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 910 430 1055 495 1305 615 1350 635 1045 495 1230 580 1315 620 1420 670
NORM (Normal) 830 390 940 445 1165 550 1215 575 945 445 1100 520 1190 560 1300 615
" (Minus) 745 350 845 400 1030 485 1070 505 850 400 975 460 1035 485 1130 535
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 840 395 965 455 1195 565 1235 585 730 344 800 377 860 405 994 469
NORM (Normal) 765 360 865 410 1055 495 1105 520 680 320 745 351 780 368 850 401
" (Minus) 700 330 785 370 955 450 985 465 620 292 685 323 725 342 760 358
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (65% for units built prior to 09−2002) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position − minimum 500 cfm (235 L/s).
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75% of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 45% of the 2nd stage COOL speed position.
G60UHV−36B−090 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) N/A N/A 1035 490 1280 605 1335 630 1010 475 1175 555 1275 600 1400 660
NORM (Normal) N/A N/A 930 440 1150 540 1190 560 935 440 1055 495 1130 535 1250 590
" (Minus) N/A N/A 830 390 1020 480 1050 495 830 390 940 445 1005 475 1090 515
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) N/A N/A 935 440 1150 540 1195 565 740 349 800 377 850 401 910 429
NORM (Normal) N/A N/A 840 395 1035 490 1070 505 675 318 740 349 780 368 845 398
" (Minus) N/A N/A 755 355 930 440 965 455 615 290 690 325 715 337 750 353
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (65% for units built prior to 09−2002) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position − minimum 500 cfm (235 L/s).
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75% of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 45% of the 2nd stage COOL speed position.
N/A − 1st stage HEAT, speed position 1, cannot be used with this model.
G60UHV−60C−090 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Bottom Return Air, Side Return Air with Optional RAB Return Air Base, Return Air from Both Sides or
Return Air from Bottom and One Side.
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1525 720 1715 810 1935 915 2125 1005 1630 770 1760 830 1960 925 2185 1030
NORM (Normal) 1385 655 1560 735 1760 830 1930 910 1480 700 1600 755 1785 840 1985 935
" (Minus) 1245 590 1400 660 1580 745 1740 820 1335 630 1440 680 1605 755 1785 845
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1395 660 1580 745 1780 840 1960 925 1120 528 1200 566 1370 646 1550 731
NORM (Normal) 1265 595 1440 680 1615 760 1780 840 1000 471 1100 519 1250 589 1375 648
" (Minus) 1140 540 1295 610 1465 690 1605 755 900 424 975 460 1120 528 1230 580
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (60% for units built prior to 09−2002) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75% of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 42% of the 2nd stage COOL speed position.

Page 5
BLOWER DATA
G60UHV−60C−090 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Single Side Return Air − Air volumes in bold require field fabricated transition to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) clean-
able air filter in order to maintain proper air velocity across the filter.
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1475 695 1665 785 1870 880 2050 965 1580 745 1700 800 1920 905 2110 995
NORM (Normal) 1340 630 1515 715 1700 800 1865 880 1435 675 1545 730 1745 825 1920 905
" (Minus) 1205 570 1365 645 1530 720 1680 790 1290 610 1390 655 1570 740 1730 815
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1355 640 1535 725 1710 805 1890 890 1070 504 1160 547 1325 625 1490 703
NORM (Normal) 1230 580 1395 660 1555 735 1720 810 955 450 1060 500 1210 570 1325 625
" (Minus) 1105 520 1255 590 1400 660 1550 730 860 405 935 441 1085 512 1185 559
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (60% for units built prior to 09−2002) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75% of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 42% of the 2nd stage COOL speed position.
G60UHV−60C−110 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Bottom Return Air, Side Return Air with Optional RAB Return Air Base, Return Air from Both Sides or
Return Air from Bottom and One Side.
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1485 700 1695 800 1910 900 2130 1005 1630 770 1750 825 1980 935 2185 1030
NORM (Normal) 1350 635 1540 730 1735 820 1935 915 1480 700 1590 750 1800 850 1985 940
" (Minus) 1215 575 1390 655 1560 735 1740 820 1335 630 1435 675 1620 765 1790 845
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1365 645 1550 730 1735 820 1925 910 1080 509 1075 507 1315 620 1445 681
NORM (Normal) 1240 585 1410 665 1575 745 1750 825 990 467 1050 495 1195 563 1315 620
" (Minus) 1115 525 1270 600 1420 670 1575 745 890 419 940 443 1075 507 1195 563
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (60% for units built prior to 09−2002) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75% of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 42% of the 2nd stage COOL speed position.

Page 6
BLOWER DATA
G60UHV−60C−110 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Single Side Return Air − Air volumes in bold require field fabricated transition to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) clean-
able air filter in order to maintain proper air velocity across the filter.
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1430 675 1615 765 1835 865 2040 965 1530 720 1660 785 1875 885 2100 990
NORM (Normal) 1300 615 1470 695 1665 785 1855 875 1390 655 1510 715 1705 805 1910 900
" (Minus) 1170 550 1325 625 1500 710 1670 790 1250 590 1360 640 1535 725 1720 810
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1305 615 1480 700 1680 790 1865 880 965 455 1060 500 1205 568 1345 634
NORM (Normal) 1185 560 1345 635 1525 720 1695 800 885 417 965 455 995 469 1225 578
" (Minus) 1065 505 1210 570 1375 650 1525 720 795 375 875 412 985 464 1115 526
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (60% for units built prior to 09−2002) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75% of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 42% of the 2nd stage COOL speed position.
G60UHV−60D−135 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Bottom Return Air, Side Return Air with Optional RAB Return Air Base, Return Air from Both Sides or
Return Air from Bottom and One Side.
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1520 715 1725 815 1940 915 2130 1005 1630 770 1760 830 1985 935 2200 1040
NORM (Normal) 1385 655 1570 740 1765 835 1940 915 1480 700 1600 755 1805 850 2000 945
" (Minus) N/A N/A 1410 665 1590 750 1745 825 1335 630 1440 680 1625 765 1800 850
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1395 660 1580 745 1760 830 1960 925 1090 514 1170 552 1315 620 1450 684
NORM (Normal) 1265 595 1435 675 1600 755 1785 840 995 469 1060 500 1200 566 1320 622
" (Minus) N/A N/A 1295 610 1440 680 1605 755 895 422 950 448 1080 509 1200 566
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (65% for units built prior to 09−2009) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75%of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 45% of the 2nd stage COOL speed position.
N/A − 1st stage HEAT, speed position 1 with " (Minus) Adjust" setting, cannot be used with this model.

Page 7
BLOWER DATA
G60UHV−60D−135 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
Single Side Return Air − Air volumes in bold require field fabricated transition to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) clean-
able air filter in order to maintain proper air velocity across the filter.
Blower Control Factory Settings ADJUST − NORM
HEAT − 2
COOL − 4
ADJUST"
Switch
Positions
Speed Switch Positions
2nd Stage HEAT" Speed 2nd Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1415 665 1625 765 1820 860 2015 950 1525 720 1650 780 1875 885 2095 990
NORM (Normal) 1285 605 1475 695 1655 780 1830 865 1385 655 1500 710 1705 805 1905 900
" (Minus) N/A N/A 1330 625 1490 705 1645 775 1245 590 1350 635 1535 725 1715 810
ADJUST"
Switch
Positions
1st Stage HEAT" Speed 1st Stage COOL" Speed
1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+" (Plus) 1300 615 1480 700 1660 785 1850 875 965 455 1070 504 1215 573 1345 634
NORM (Normal) 1180 555 1345 635 1510 715 1680 795 885 417 975 460 1105 521 1225 578
" (Minus) N/A N/A 1210 570 1360 640 1510 715 795 375 870 410 995 469 1115 526
NOTES − The effect of static pressure and filter resistance is included in air volumes shown.
1st stage HEAT is approximately 91% of the same 2nd stage HEAT speed position.
1st stage COOL (two speed air conditioning units only) is approximately 70% (65% for units built prior to 09−2002) of the same 2nd stage COOL speed position.
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.
Lennox Harmony IIzone control applications − Minimum blower heating speed is approximately 75%of the 1st stage HEAT speed position.
Lennox Harmony IIzone control applications − Minimum blower cooling speed is approximately 45% of the 2nd stage COOL speed position.
N/A − 1st stage HEAT, speed position 1 with " (Minus) Adjust" setting, cannot be used with this model.
FILTER AIR RESISTANCE
cfm L/s in. w.g. Pa
0 0 0.00 0
200 95 0.01 0
400 190 0.03 5
600 285 0.04 10
800 380 0.06 15
1000 470 0.09 20
1200 565 0.12 30
1400 660 0.15 35
1600 755 0.19 45
1800 850 0.23 55
2000 945 0.27 65
2200 1040 0.33 80
2400 1130 0.38 95
2600 1225 0.44 110
HIGH ALTITUDE
Model
Input
Size
Gas
Altitude Manifold Pressure
at all altitudes
0 − 4500 ft.
(0 − 1372 m)
4,501 − 7500 ft.
(1373 − 2286 m)
7501−10,000 ft.
(2286 − 3048 m)
Required
Conversion
Kit
Pressure
Switch
Required
Conversion
Kit
Pressure
Switch
Required
Conversion
Kit
Pressure
Switch
Low Fire High Fire
in. w.g. kPa in. w.g. kPa
070−1 to −6 Nat. N/A No Change N/A No Change 59M16 18M64 1.7 0.42 3.5 0.87
LPG 59M13 No Change 59M13 No Change 59M14 18M64 4.9 1.22 10.0 2.5
090−1 to −6 Nat. N/A No Change N/A 18M61 59M16 18M64 1.7 0.42 3.5 0.87
LPG 59M13 No Change 59M13 18M61 59M14 18M64 4.9 1.22 10.0 2.5
110/135−1 to
−6
Nat. N/A No Change N/A 18M63 59M16 18M61 1.7 0.42 3.5 0.87
LPG 59M13 No Change 59M13 18M63 59M14 18M61 4.9 1.22 10.0 2.5
070−7 and
later
Nat. N/A No Change N/A No Change 59M17 18M64 1.7 0.42 3.5 0.87
LPG 59M13 No Change 59M13 No Change 59M14 18M64 4.9 1.22 10.0 2.5
090−7 and
later
Nat. N/A No Change N/A 18M61 59M17 18M64 1.7 0.42 3.5 0.87
LPG 59M13 No Change 59M13 18M61 59M14 18M64 4.9 1.22 10.0 2.5
110/135−7
and later
Nat. N/A No Change N/A 18M63 59M17 18M61 1.7 0.42 3.5 0.87
LPG 59M13 No Change 59M13 18M63 59M14 18M61 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).

Page 8
FIGURE 1
Flue
Transition
Combustion Air Inducer
Combustion Air
Orifice
Combustion Air
Prove Switch Assembly
(two switches)
Flue
Collector
Box
Heat Exchanger
Flame Sensor
Gas Valve
Burners
Ignitor
NOxInsert
Primary
Limit
Door Interlock Switch
SureLight Two−Stage,
Variable Speed
Integrated Control Board Control Transformer
Circuit Breaker
Gasket
Flue Box Gasket
Gas
Orifices
Ignitor
Bracket
Burner Box Bottom
Limit Shield
Secondary Limit(s)
(NOxUnits Only)
Air Deflector
G60UH−60C−110
Units Only
Variable Speed
Blower Motor
Flame Rollout Switches
Air Intake
Cover
Air Baffle
Gasket
Burner
Box Cover
Power Choke
(1 hp Only)
Sight
Glass
Burner
Box Top
G60UHV(X) PARTS ARRANGEMENT

Page 9
I−UNIT COMPONENTS
G60UHV(X) unit components are shown in figure 1. The
gas valve, combustion air inducer and burners can be ac-
cessed by removing the burner access panel. Electrical
components are in the control box (figure 2) found in the
blower section.
G60UHV(X) units are factory equipped with a bottom return
air panel in place. The panel is designed to be field removed
as required for bottom air return. Markings are provided for
side return air and may be cut out in the field.
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during furnace
installation and service to protect the furnace’s
electronic controls. Precautions will help to
avoid control exposure to electrostatic dis-
charge by putting the furnace, the control and
the technician at the same electrostatic poten-
tial. Neutralize electrostatic charge by touching
hand and all tools on an unpainted unit surface,
such as the gas valve or blower deck, before per-
forming any service procedure.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
1. Control Transformer (T1)
A transformer located in the control box provides power to
the low voltage section of the unit. Transformers on all
models are rated 40VA with a 120V primary and a 24V sec-
ondary.
2. Door Interlock Switch (S51)
A door interlock switch rated 14A at 125VAC is wired in se-
ries with line voltage. When the blower door is removed the
unit will shut down.
FIGURE 2
CONTROL BOX G60UHV(X)
SureLight
CONTROL
BOARD
TRANSFORMER
CIRCUIT BREAKER
DOOR INTERLOCK
SWITCH
3. Circuit Breaker (CB8)
A 24V circuit breaker is also located in the control box.
The switch provides overcurrent protection to the trans-
former (T1). The breaker is rated 3A at 32V. If the current
exceeds this limit the breaker will trip and all unit opera-
tion will shutdown. The breaker can be manually reset
by pressing the button on the face. See figure 3.
FIGURE 3
CIRCUIT BREAKER CB8
PRESS TO RESET
WARNING
Shock hazard.
Disconnect power before servicing. Integrated
Control Board is not field repairable. If control is
inoperable, simply replace entire control.
Can cause injury or death. Unsafe operation will
result if repair is attempted.
4. Integrated Control Board(A92)
Boards 18M99 and 49M59
All G60UHV units are equipped with the Lennox two−
stage, variable speed integrated SureLight control board.
The system consists of a ignition / blower control board
(figure 4 with control terminal designations in tables 1
through 4) and ignitor (figure 12). The board and ignitor
work in combination to ensure furnace ignition and ignitor
durability. The SureLight integrated board controls all ma-
jor furnace operations. The board features two LED lights,
DS1 and DS2 for troubleshooting and four LED lights
(DS3, DS6, DS7 and DS8) to show furnace status. The
board also has two accessory terminals rated at (1) one
amp each. See table 5 for status code and table 6 for trou-
bleshooting diagnostic codes.
Electronic Ignition
At the beginning of the heat cycle the SureLight control
monitors the first stage and second stage combustion air
inducer prove switch. The control will not begin the heating
cycle if the first stage prove switch is closed (by−passed).
Likewise the control will not begin the second stage heating
cycle if the second stage prove switch is closed, and will re-
main in first stage heat. However, if the second stage prove
switch closes during the first stage heat pre−purge, the con-
trol will allow second stage heat. Once the first stage prove
switch is determined to be open, the combustion air induc-
er is energized on low (first stage) heat speed. When the
differential in the prove switch is great enough, the prove
switch closes and a 15−second pre−purge begins. If the
switch is not proven within 2−1/2 minutes, the control goes
into Watchguard−Pressure Switch mode for a 5−minute re−
set period.

Page 10
After the 15−second pre−purge period, the SureLight ignitor
warms up for 20 seconds after which the gas valve opens
for a 4−second trial for ignition. The ignitor energizes during
the trial until flame is sensed. If ignition is not proved during
the 4−second period, the control will try four more times with
an inter purge and warm−up time between trials of 35 sec-
onds. After a total of five trials for ignition (including the ini-
tial trial), the control goes into Watchguard−Flame Failure
mode. After a 60−minute reset period, the control will begin
the ignition sequence again.
The SureLight control board has an added feature that pro-
longs the life of the ignitor. After a successful ignition, the
SureLight control utilizes less power to energize the ignitor
on successive calls for heat. The control continues to ramp
down the voltage to the ignitor until it finds the lowest
amount of power that will provide a successful ignition. This
amount of power is used for 255 cycles. On the 256th call
for heat, the control will again ramp down until the lowest
power is determined and the cycle begins again.
Two Stage Operation / Thermostat Selection Jumper
The control can be utilized in two modes: SINGLE−STAGE
thermostat or TWO−STAGE thermostat. The thermostat
selection jumper E20, located just below dip switches 1
through 3 (figure 4), must be positioned for the particular
application. The jumper is factory set on TWO" for use
with a two−stage thermostat with two stage heat. Re−posi-
tion jumper to SINGLE" for use with a single stage thermo-
stat with two stage heat.
While in the single−stage thermostat mode (single jumper
setting), the burners will always fire on first−stage heat. The
combustion air inducer will operate on low speed and in-
door blower will operate on low heat speed. After a 10 min-
ute recognition period, the unit will switch to second stage
heat. While in the two−stage thermostat mode (two jumper
setting) the burners will fire on first−stage heat. The com-
bustion air inducer will operate on low speed and indoor
blower will operate on low heat speed. The unit will switch
to second−stage heat on call from the indoor thermostat. If
there is a simultaneous call for first and second stage heat,
the unit will fire an first stage heat and switch to second
stage heat after 30 seconds of operation. See Sequence of
Operation flow charts in the back of this manual for more
detail.
TW0−STAGE, VARIABLE SPEED INTEGRATED
CONTROL BOARD
FIGURE 4
DIP
SWITCHES
1 − 3
DIP
SWITCHES
5 − 12
DIAGNOSTIC
LEDs
ON−BOARD
JUMPER W951
(cut when heat pump
is used with FM21)
ON−BOARD
JUMPER W914
(cut when SignatureStat,
CCB1 or Harmony II are used)
LEDs
LED
FACTORY−
INSTALLED
JUMPER
THERMOSTAT CONNECTIONS (TB1)
DIP SWITCH FUNCTIONS
DIP SWITCH(ES) FUNCTION
1 and 2 Blower Off Delay
3 Second Stage ON Delay (Single−stage t’stat)
4 Not used
5 and 6 Cooling Mode Blower Speed
7 and 8 Blower Speed Adjustment
9 and 10 Cooling Mode Blower Ramping Profile
11 and 12 Heating Mode Blower Speed
E20
JUMPER
16 PIN BLOWER
CONTROL TERMINALS
DS8
DS7 DS3
DS6