Lennox GHR32Q, GHR32V Unit Information

Service Literature

GHR32Q/V SERIES UNITS

This manual contains information pertaining to GHR32−1 through −6 model units. GHR32 series units are high−efficiency horizontal or down flow gas furnaces manufactured with Lennox DuralokPlust aluminized and stainless steel clamshell-type heat exchangers. GHR32Q units are available in heating input capacities of 50,000 to 120,000 Btuh (14.7 to 35.2 kW) and cooling applications from 2 through 5 tons (7.0 through 17.6 kW). GHR32V units are available in heating capacities of 75,000 and 100,000 Btuh (22.0 and 29.3 kW) and 3 and 5 tons (10.5 and 17.5) for cooling. Refer to Engineering Handbook for proper sizing.

Units are factory equipped for use with natural gas. A kit is available for conversion to LPG operation. GHR32−1 through −4 units are equipped with the Lennox SureLight silicon nitride ignition system. GHR32−5 units are equipped with the two stage (V models will have the variable speed control) integrated control board. Each GHR32 unit meets the California Nitrogen Oxides (NOx) Standards and California Seasonal Efficiency requirements. The gas valve is redundant to assure safety shut−off as required by A.G.A. and C.G.A.

The heat exchanger, burners and manifold assembly can be removed for inspection and service. The maintenance section gives a detailed description on how this is done.

Information contained in this manual is intended for use by qualified service technicians only. All specifica-

tions are subject to change. Procedures outlined in this manual are presented as a recommendation only and do not supersede or replace local or state codes.

TABLE OF CONTENTS

General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications Q Models 2. . . . . . . . . . . . . . . . . . . . . . . .

Blower performance Q Models 3. . . . . . . . . . . . . . . . . .

Specifications V Models 4. . . . . . . . . . . . . . . . . . . . . . . .

Blower performance V Models 5. . . . . . . . . . . . . . . . . . .

Parts Arrangement 7. . . . . . . . . . . . . . . . . . . . . . . . . . . .

I Unit Components 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

II Placement and Installation 41. . . . . . . . . . . . . . . . . . . .

III Start Up 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IV Heating System Service Checks 47. . . . . . . . . . . . . .

V Typical Operating Characteristics 49. . . . . . . . . . . . . .

VI Maintenance 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GHR32Q/V

Corp. 0001−L2

Revised 08−2004

DOWN FLOW

POSITION

GHR32Q MODEL SHOWN

VII Wiring Diagram and Sequence of Operation 54. . . .

GHR32Q−1 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GHR32Q−3 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GHR32Q−5 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GHR32V−1 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GHR32V−3 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GHR32V−4 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GHR32V−5 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VIII Operating Flow Charts 65. . . . . . . . . . . . . . . . . . . . . .

IX Troubleshooting 76. . . . . . . . . . . . . . . . . . . . . . . . . . . .

X Blower Control Board Jumper Summary 87. . . . . . . .

Page 1

Litho U.S.A.

SPECIFICATIONS GHR32Q MODELS

(kW)

Temperature rise

Blower wheel nominal

Nominal cooling

Intake

Kit

()

10.0 (2.49)

Kit #67K27

Model No. GHR32Q2/3-50 GHR32Q3-75 GHR32Q4/5-100 GHR32Q4/5-120

nput  Btuh

utput  Btuh

A.F.U.E. 90.0%

California Seasonal Efficiency 83.7% 83.9% 85.3% 84.0%

Exhaust pipe connection (PVC) diameter  in. (mm) 2 (51)

Intake pipe connection (PVC) diameter  in. (mm) 2 (51)

Condensate drain connection (PVC)  in. (mm) 1/2 (12.7)

Temperature rise range  _F (_C)

High static certified by (A.G.A./C.G.A.)  in wg. (Pa) .50 (125)

Gas Piping Size I.P.S.  in. (mm) 1/2 (12.7)

Blower wheel nominal

diameter x width

Number and size of filters − in. (mm) (1) 14 x 25 x 1 (356 x 635 x 25) (1) 20 x 25 x 1 (508 x 635 x 25)

Blower motor output  hp (W) 1/3 (249) 1/2 (373) 3/4 (560)

Nominal cooling

that can be added

Shipping weight  lbs. (kg) 1 package 147 (67) 155 (70) 196 (89) 205 (93)

Electrical characteristics 120 volts  60 hertz  1 phase (less than 12 amps)

High Fire 50,000 (14.7) 72,000 (21.1) 100,000 (29.3) 118,000 (34.6)

Low Fire 34,000 (10.0) 51,000 (14.9) 68,000 (19.9) 81,600 (23.9)

High Fire 47,000 (13.8) 67,000 (19.6) 93,000 (27.2) 111,000 (32.5)

Low Fire 31,600 (9.3) 47,000 (13.8) 63,000 (18.4) 75,900 (22.2)

High Fire 30 − 60 (17 − 33) 40 − 70 (22 − 39) 45 − 75 (25 − 42)

Low Fire 25 − 55 (14 − 31) 35 − 65 (20 − 36) 40 − 70 (22 − 39)

in. 10 x 8 11-1/2 x 9

mm 254 x 203 292 x 229

Tons 2 to 3 2 to 3.5 3.5 to 5

kW 7.0 to 10.6 7.0 to 12.3 12.3 to 17.6

Optional Accessories (Must Be Ordered Extra)

LPG/Propane kit 59L81 (−1 and −2 models) 11M57 (−3 and later models)

Down-Flow Additive Base 32K52 32K53

Horizontal Support Frame Kit  Ship. Wt. − lbs. (kg.) 56J18  18 lbs. (8 kg)

Concentric Roof/Wall Termination Kits 60G77 − For 1 1/2 inch (38 mm) venting

Roof

Vent/

Intake

Kits

Twinning Kit 15L38 (all models)

Condensate Drain Heat Cable 26K68 6 ft. (1.8 m)  26K69 24 ft. (7.3 m)  26K70 50 ft. (15.2 m)

Heat Cable Tape 39G04 1/2 inch (13 mm) wide or 39G03 2 inch (51 mm) wide

Annual Fuel Utilization Efficiency based on U.S. DOE test procedures and FTC labeling regulations. Isolated combustion system rating for non-weatherized furnaces. Determine from venting tables proper intake and exhaust pipe size and termination kit required. Cleanable polyurethane frame type filter.

Termination

Kits

Wall

Termination

For 2 inch (51 mm) venting 15F75 Not Available

For 3 inch (76 mm) venting Not Available 44J41

For 2 inch (51 mm) venting

15F74 (ring kit) − 22G44 (close couple) − 30G28 (WTK Close Cou-

30G79 (WTKX close couple with extension riser)

For 3 inch (76 mm) venting Not Available 44J40 (close couple)  81J20 (WTK close couple)

ple)

33K97 − For 2 inch

(51 mm) venting

60L46 − For 3 inch

(76 mm) venting

Not Available

HIGH ALTITUDE

No gas pressure adjustment is needed when operating from 0 to 4500 ft. (0 to 1372m). See table below for correct manifold pressure and prove switch for altitudes greater than 4500 ft. (1372m).

Model No. Prove Switch

GHR32−50 nat no change 3.5 (0.87) 3.5 (0.87) 3.5 (0.87)

GHR32−75 nat

GHR32−100 nat

GHR32−120 L.P.

GHR32−50 L.P.

GHR32−75 L.P.

GHR32−100 L.P.

HGR32−120 L.P.

Kit #67K27 3.4 (0.85) 3.3 (0.82) 3.2 (0.80)

no change

Manifold Pressure (outlet) in. w.g. (kPa)

4501 to 5500 ft.

(1373 to 1676m)

10.0 (2.49) 10.0 (2.49) 10.0 (2.49)

9.6 (2.39) 9.3 (2.31) 9.0 (2.24)

5501 to 6500 ft.

(1677 to 1981m)

6501 to 7500 ft.

(1982 to 2286m)

Page 2

BLOWER PERFORMANCE DATA Q MODELS

External Static

GHR32Q2/3-50 BLOWER PERFORMANCE

External Static

Pressure

in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts

0 0 1480 700 640 1330 630 520 1070 505 435 900 425 355 .10 25 1430 675 615 1290 610 500 1050 495 420 880 415 346 .20 50 1380 650 595 1240 585 480 1040 490 400 870 410 330 .30 75 1320 625 570 1200 565 455 1010 475 380 850 400 320 .40 100 1260 595 545 1140 540 430 980 460 370 820 385 300 .50 125 1200 565 520 1080 510 410 930 440 320 790 375 280 .60 150 1100 520 500 1000 470 385 860 405 300 740 350 265 .70 175 1000 470 470 890 420 370 750 355 290 660 310 250 .80 200 800 380 440 700 330 340 590 280 280 550 260 240

NOTE  All air data is measured external to unit with air filter in place.

High Medium-High Medium-Low Low

GHR32Q3-75 BLOWER PERFORMANCE

External Static

Pressure

in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts

0 0 1650 780 720 1540 725 585 1450 685 540 1230 580 450 .10 25 1590 750 660 1490 705 550 1400 660 505 1200 565 420 .20 50 1520 715 645 1430 675 520 1350 635 485 1170 550 405 .30 75 1440 680 630 1370 645 490 1300 615 450 1130 535 390 .40 100 1370 645 610 1300 615 470 1240 585 430 1090 515 370 .50 125 1300 615 590 1240 585 450 1170 550 410 1040 490 330 .60 150 1210 570 560 1170 550 430 1100 520 375 970 460 320 .70 175 1120 530 540 1080 510 410 1020 480 350 890 420 280 .80 200 1020 480 515 980 460 380 900 425 325 750 355 260 .90 225 880 415 500 820 385 350 750 355 300 600 285 240

NOTE  All air data is measured external to unit with air filter in place.

High Medium-High Medium-Low Low

GHR32Q4/5-100 BLOWER PERFORMANCE

External Static

Pressure

in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts

0 0 2530 1195 1360 2300 1085 1210 2030 960 1050 1780 840 885 1540 725 745 .10 25 2460 1160 1290 2250 1060 1140 2010 950 1010 1760 830 850 1530 720 730 .20 50 2380 1125 1270 2200 1040 1100 1990 940 990 1740 820 830 1520 715 720 .30 75 2310 1090 1250 2150 1015 1080 1950 920 970 1720 810 805 1510 715 710 .40 100 2250 1060 1200 2090 985 1060 1910 900 950 1690 800 790 1500 710 690 .50 125 2180 1030 1150 2020 955 1020 1870 880 910 1660 785 780 1480 700 670 .60 150 2100 990 1100 1960 925 980 1810 855 870 1620 765 760 1430 675 650 .70 175 2010 950 1070 1880 885 940 1750 825 855 1570 740 730 1380 650 630 .80 200 1910 900 1040 1800 850 920 1680 795 840 1500 710 710 1320 625 615 .90 225 1800 850 1010 1700 800 890 1580 745 800 1420 670 690 1240 585 600

1.00 250 1700 800 980 1600 755 870 1500 710 780 1320 625 670 1120 530 590

NOTE  All air data is measured external to unit with air filter in place.

High Medium-High Medium Medium-Low Low

Air Volume and Motor Watts at Specific Blower Taps

GHR32Q4/5-120 BLOWER PERFORMANCE

External Static

Pressure

in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts

0 0 2400 1135 1250 2270 1070 1140 2060 970 1010 1800 850 860 1560 735 720 .10 25 2350 111 0 1220 2220 1050 1100 2040 965 980 1780 840 830 1550 730 705 .20 50 2290 1080 1200 2170 1025 1080 2000 945 960 1750 825 815 1540 725 685 .30 75 2220 1050 1180 2120 1000 1060 1960 925 940 1720 810 800 1520 715 675 .40 100 2150 1015 1130 2050 965 1020 1900 895 920 1680 795 770 1500 710 660 .50 125 2080 980 1100 1980 935 980 1850 875 880 1640 775 750 1460 690 650 .60 150 2000 945 1050 1910 900 940 1780 840 840 1590 750 720 1420 670 630 .70 175 1900 895 1010 1830 865 920 1710 805 810 1530 720 690 1380 650 610 .80 200 1800 850 980 1740 820 900 1630 770 790 1460 690 675 1320 625 595 .90 225 1700 800 960 1630 770 860 1540 725 770 1380 650 660 1250 590 580

1.00 250 1600 755 940 1530 720 840 1430 675 750 1300 615 640 1150 545 560

NOTE  All air data is measured external to unit with air filter in place.

High Medium-High Medium Medium-Low Low

Air Volume and Motor Watts at Specific Blower Taps

Page 3

SPECIFICATIONS GHR32V MODELS

Temperature rise

Blower wheel nominal

Nominal cooling

Vent/

Kits

Model No. GHR32V3-75 GHR32V5-100

High Fire 72,000 (21.1) 100,000 (29.3)

Input  Btuh (kW)

Output  Btuh (kW)

A.F.U.E. 90.0% 90.0%

California Seasonal Efficiency 83.9 85.3

Exhaust pipe connection (PVC) diameter  in. (mm) 2 (51)

Intake pipe connection (PVC) diameter  in. (mm) 2 (51)

Condensate drain connection (PVC)  in. (mm) 1/2 (12.7)

Low Fire 51,000 (14.9) 68,000 (19.9)

High Fire 67,000 (19.6) 93,000 (27.2)

Low Fire 47,000 (13.8) 63,000 (18.4)

Te mperature rise range  _F (_C)

High static certified by (A.G.A./C.G.A.)  in wg. (Pa) .80 (200)

Gas Piping Size I.P.S.  in. (mm) 1/2 (12.7)

Blower wheel nominal

diameter x width

Blower motor output  hp (W) 1/2 (373) 1 (746)

Number and size of filters − in. (mm) (1) 14 x 25 x 1 (356 x 635 x 25) (1) 20 x 25 x 1 ( 508 x 635 x 25)

Nominal coolin

that can be added

Shipping weight  lbs. (kg) 1 package 160 (73) 201 (91)

Electrical characteristics 120 volts  60 hertz  1 phase (less than 12 amps)

High Fire 40 − 70 (22 − 39)

Low Fire 35 − 65 (19 − 36)

in. 10 x 8 11-1/2 x 9

mm 254 x 203 292 x 229

Tons 2 to 3.5 3.5 to 5

kW 7.0 to 12.3 12.3 to 17.6

Optional Accessories (Must Be Ordered Extra)

LPG/Propane kit 59L81

Down-Flow Additive Base 32K52 32K53

Horizontal Support Frame Kit  Ship. Wt. − lbs. (kg.) 56J18  18 lbs. (8 kg)

Concentric Roof/Wall Termination Kits 60G77 − For 1 1/2 inch (38 mm) venting 33K97 − For 2 inch (51 mm) venting

Roof

Termination

Vent/

Intake

Kits

Condensate Drain Heat Cable 26K68 6 ft. (1.8 m)  26K69 24 ft. (7.3 m)  26K70 50 ft. (15.2 m)

Heat Cable Tape 39G04 1/2 inch (13 mm) wide or 39G03 2 inch (51 mm) wide

Kits

Wall

Termination

Kits

For 2 inch (51 mm) venting 15F75

For 3 inch (76 mm) venting 44J41

15F74 (ring kit)

For 2 inch (51 mm) venting

30G79 (WTKX close couple w/ extension riser)

For 3 inch (76 mm) venting 44J40 (close couple)  81J20 (WTK close couple)

22G44 (close couple)

30G28 (WTK Close Couple)

22G44 (close couple)

Page 4

15F74 (ring kit)

BLOWER PERFORMANCE DATA −1 through −3 V MODELS

Jumper

Setting

ADJUST

Jumper

Positions

ADJUST

Jumper

Positions

GHR32V3-75 BLOWER PERFORMANCE

0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range

VSP2−1 Blower Control Low Speed  3 Factory Settings High Speed  4

ADJUST"

Jum

Setting

NORM 875 415 940 445 985 465

minus 15%

less motor

speed

NOTE  The effect of static pressure and filter resistance is included in the air volumes listed.

(Cool, Low Heat Or Continuous Fan)

1 2 3 4 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 cfm L/s cfm L/s cfm L/s cfm L/s

750 355 795 375 850 400 915 430 900 425 940 445

LOW" Speed

GHR32V5-100 BLOWER PERFORMANCE

0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range

VSP2−1 Blower Control Low Speed  2 Factory Settings High Speed  4

ADJUST"

Jumper

Settin

NORM 1100 520 1260 595 1445 680 1635 770 1670 790 1960 925 2165 1020 2285 1075 1640 775 1825 860 2150 1015 2315 1090

minus 15%

less motor

speed

NOTE  The effect of static pressure and filter resistance is included in the air volumes listed.

LOW" Speed (Cool Or Continuous Fan) HIGH" Speed (Cool) HEAT" Speed

1 2 3 4 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 cfm L/s cfm L/s cfm L/s cfm L/s

935 440 1015 480 1195 565 1355 640 1335 630 1495 705 1690 800 1800 850 1360 640 1465 690 1770 835 1905 900

GHR32V3-75 BLOWER PERFORMANCE

0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range

VSP3−1 Blower Control Factory Settings ADJUST − NORM

ADJUST"

Jumper

Positions

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

NORM (Normal) 875 415 940 445 985 465 1060 500 1090 515 1175 555 1285 605 1330 630

 " (Minus) 15% 750 355 795 375 850 400 915 430 940 445 995 470 1095 515 1180 555

ADJUST"

Jumper

Position

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

NORM (Normal) 875 415 940 445 985 465 1060 500 1070 505 1130 535 1270 600 1290 610

 " (Minus) 15% 750 355 795 375 850 400 915 430 900 425 940 445 1055 500 1120 530

 15% lower motor speed than NORM jumper setting.

NOTE − The effect of static pressure and filter resistance is included in air volumes shown. NOTE − Continuous Fan only speed is approximately 825 cfm (390 L/s) − non adjustable. NOTE − Lennox Harmony IIt zone control applications − MAX CFM is determined by COOL jumper placement with a minimum of approximately 875 cfm (415 L/s) for all positions.

GHR32V5−100 BLOWER PERFORMANCE

0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range

VSP3−1 Blower Control Factory Settings ADJUST − NORM

ADJUST"

Jumper

Positions

NORM (Normal) 1100 520 1260 595 1445 680 1635 770 1640 775 1825 860 2150 1015 2315 1090

 " (Minus) 15% 935 440 1015 480 1195 565 1355 640 1360 640 1465 690 1770 835 1905 900

ADJUST"

Jumper

Position

NORM (Normal) 1100 520 1260 595 1445 680 1635 770 1670 790 1960 925 2165 1020 2285 1075

 " (Minus) 15% 935 440 1015 480 1195 565 1355 640 1335 630 1495 705 1690 800 1800 850

 15% lower motor speed than NORM jumper setting.

NOTE − The effect of static pressure and filter resistance is included in air volumes shown. NOTE − Continuous Fan only speed is approximately 1050 cfm (495 L/s) − non adjustable. NOTE − Lennox Harmony IIt zone control applications − MAX CFM is determined by COOL jumper placement with a minimum of approximately 1100 cfm (520 L/s) for all positions.

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

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

Heat Speed  3

VSP Jumper Speed Positions

HIGH" Speed (Cool) HEAT" Speed

106

500

107

505 113 0 535

127

105

129

600

500 112 0 530 940 445 995 470

610

109

515 117 5 555

Heat Speed  1

VSP Jumper Speed Positions

BLOWER PERFORMANCE DATA −4 V MODELS

Heat Speed − 3 Cool Speed − 4

VSP Jumper Speed Positions

HEAT"

Low Speed High Speed

COOL"

Low Speed High Speed

Heat Speed − 2 Cool Speed − 4

VSP Jumper Speed Positions

HEAT"

Low Speed High Speed

COOL"

Low Speed High Speed

Page 5

128

605

109

515 118 0 555

133

630

GHR32V3−75−5 Blower Motor Performance

Adjust

Jumper

Adjust"

Jumper

Adj

Jumper

(For Static Pressure 0.0" to 0.8" w.g.)

Blower Speed Adjustment Settings (Switches 5 and 6)



Jumper

Setting

Norm 875 415 940 445 985 465 1060 500 1070 505 1130 535 1270 600 1290 610



–

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

750 355 795 375 850 400 915 430 900 425 940 445 1055 500 1120 530

Low High

Cooling

Blower Speed Adjustment Settings (Switches 7 and 8)

 Jumper

Setting

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

Low High

Norm 945 446 1025 484 1125 531 1270 599 1080 510 1172 533 1286 607 1452 685



–

803 379 871 411 956 451 1080 510 918 433 996 470 1093 516 1234 582

15% lower motor speed than NORM switch setting.

NOTE − The effect of static pressure and filter resistance is included in air volumes shown. NOTE − Continuous Fan only speed is approximately 825 cfm (390 L/s) − non adjustable. NOTE − Lennox Harmony IIt zone control applications − MAX CFM is determined by COOL switch setting with a minimum of approximately 875 cfm (415 L/s) for all positions.

Heating

GHR32V5−100/125−5 Blower Motor Performance

(For Static Pressure 0.0" to 0.8" w.g.)

Blower Speed Adjustment Settings (Switches 5 and 6)



ust

Jumper

Setting

Norm 1100 520 1260 595 1445 680 1635 770 1670 790 1960 925 2165 1020 2285 1075



–

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

935 440 1015 480 1195 565 1355 640 1335 630 1495 705 1690 800 1800 850

Low High

Cooling

Blower Speed Adjustment Settings (Switches 7 and 8)



Adjust"

Setting

Norm 1100 520 1260 595 1445 680 1635 770 1640 775 1825 860 2150 1015 2315 1090



–

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

935 440 1015 480 1195 565 1355 640 1360 640 1465 690 1770 835 1905 900

Low High

15% lower motor speed than NORM switch setting.

NOTE − The effect of static pressure and filter resistance is included in air volumes shown. NOTE − Continuous Fan only speed is approximately 1050 cfm (495 L/s) − non adjustable. NOTE − Lennox Harmony IIt zone control applications − MAX CFM is determined by COOL switch setting with a minimum of approximately 1100 cfm (520 L/s) for all positions.

Heating

Page 6

GHR32Q−5 PARTS IDENTIFICATION

(Downflow Application Shown)

CONTROL VOLTAGE

CIRCUIT BREAKER

CONTROL TRANSFORMER

CONTROL BOX COVER

DOOR INTERLOCK SWITCH

COLD END HEADER

(COLLECTOR) BOX

COMBUSTION AIR

BLOWER MOUNTING

COMBUSTION

AIR INDUCER

EXHAUST TEE

PATCH PLATE

WITH BARBED

FITTING

BURNER BOX

COVER

FLAME SIGHT

GLASS

FLAME SENSOR

INTAKE AIR

GASKET

BRACKET

FRESH AIR

INTAKE FITTING

IGNITOR

SURELIGHT TWO−STAGE

INTEGRATED CONTROL

CORBELS

BURNER BOX

TOP

BURNER BOX

ASSEMBLY

ORIFICE

GAS VALVE

AND MANIFOLD

FIGURE 1

SUPPLY AIR

BLOWER

TOP CAP

CONTROL

BOX

GASKET

PRIMARY LIMIT

AUTO−RESET

(ALTERNATE STYLES)

BURNER BOX

GASKET

FLAME ROLL−OUT SWITCH

(MANUAL RESET)

SECONDARY LIMIT

AUTO−RESET

(Located on Backside

of Blower Wrapper)

CABINET

COMBUSTION AIR

PROVING (PRES-

SURE) SWITCH

HOT END HEADER

(COLLECTOR) BOX

CONDENSER

COIL

DuralokPlus

HEAT EXCHANGER

ASSEMBLY

CONDENSATE

TRAP

BACK FILTER

CLIP

FLUE

COLLAR

CONDENSATE

COLLAR

Page 7

I−UNIT COMPONENTS

GHR32 unit components are shown in figure 1. The combustion air blower, gas valve and burners can be accessed by removing the burner access panel. The blower and control box can be accessed by removing the blower access door.

INTERIOR MAKE−UP BOX INSTALLATION

MAKE−UP

BOX

WARNING

Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch

A−Make-Up Box (Figure 2)

WARNING

Unit must be grounded in accordance with national and local codes. Electric Shock Hazaed. Can cause injury or death.

A field make−up box (see figure 2) is provided for line voltage wiring. Line voltage wiring to unit is done through the J96 jack from the field make−up box to plug P96 from the control box. The box may be installed inside or outside the unit (see figures 3 and 4) and may be installed on the unit left or right side.

MAKE-UP BOX

POWER ENTRY KNOCKOUT

BOX

UNIT

GROUND

JACK J96

Box may be installed inside or outside unit.

FIGURE 2

120V LINE VOLTAGE

PIGTAIL CONNECTIONS

COVER

J96

BUSHING

P96

FIGURE 3

EXTERIOR MAKE−UP BOX INSTALLATION

MAKE−UP

BOX

BUSHING

J96

(Shown with

accessory

wire connected)

P96

FIGURE 4

An accessory (brown) output wire is provided with the makeup box. The wire provides a 120V connection for optional accessories such as electronic air cleaner or humidifier. If used, the wire is field installed in J96 jack plug by inserting the pin of the brown wire into the open socket of the jack. See figure 5. 120V accessories rated up to 4 amps total may be connected to this wire. The neutral leg of the accessory is connected to the neutral white wire in the make-up box. The acces-

INSTALLING BROWN

ACCESSORY WIRE TO J96

WHITE

NEUTRAL

BROWN

sory terminal is energized whenever the indoor blower is in operation.

BLACK

J96

FIGURE 5

Page 8

B−Control Box (Figure 6)

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

CIRCUIT BREAKER CB8

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 discharge by putting the furnace, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface, such as the gas valve or blower deck, before performing any service procedure.

GHR32−1 through −4 CONTROL BOX

TWO−STAGE

CONTROL

CIRCUIT

BREAKER

TRANSFORMER

FIGURE 6

Unit transformer (T1), circuit breaker (CB8), SureLight control (A92), VSP−2 control (A24) and Two−stage control (A86) are located in the control box. In addition, a door interlock switch (S51) is located in the control box. Jackplugs and a snap-off" terminal strip allow the control box to be easily removed for blower service.

1. Control Transformer (T1)

A transformer located in the control box provides power to the low voltage 24 volt section of the unit. Transformers on all models are rated 40VA with a 120V primary and a 24V secondary.

2. Circuit Breaker (CB8)

A 24V circuit breaker is also located in the control box. The switch provides overcurrent protection to the transformer (T1). The breaker is rated 3 amps at 32V. If the current exceeds this limit the breaker will trip and all unit operation will shut down. The breaker can be manually reset by pressing the button on the face (figure 7).

VSP−2

CONTROL

(v models only)

SURELIGHT

CONTROL

DOOR INTERLOCK

SWITCH

PRESS TO RESET

FIGURE 7

3.Door Interlock Switch (S51)

A door interlock switch rated 14 amps at 125VAC is located on the control box. The switch is wired in series with line voltage. When the blower door is removed the unit will shut down.

DANGER

Shock hazard.

Disconnect power before servicing. Control 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. SureLight Ignition System A92

All GHR32−1 through −4 units are equipped with the Lennox SureLight ignition system. The system consists of ignitor (figure 8) and ignition control board (figure 9 and table 3 ). The board and ignitor work in combination to ensure furnace ignition and ignitor durability. The SureLight integrated board controls all major furnace operations. Table 1 and 2 show jack plug terminal designations. shows control board terminations. The board also features two LED lights for troubleshooting and two accessory terminals rated at (1) one amp. See table 4 for troubleshooting diagnostic codes. Units equipped with the SureLight board can be used with either electronic or electro−mechanical thermostats without modification. The SureLight ignitor is made of durable silicon nitride. Ignitor longevity is also enhanced by voltage ramping by the control board. The board finds the lowest ignitor temperature which will successfully light the burner, thus increasing the life of the ignitor.

NOTE − Do not remove blower access panel to read Surelight LED lights. A sight glass is provided on the access panel for viewing.

Page 9

13/32’

SURELIGHT IGNITOR

MEASUREMENT IS TO I.D.

5/8"

OF RETENTION RING

FRONT VIEW

TABLE 1

SureLight BOARD J156 (J2) TERMINAL

DESIGNATIONS

PIN # FUNCTION

1 Ignitor

Combustion Air Blower Line Voltage

Combustion Air Blower Neutral

Not Used

Ignitor Neutral

Not Used

TABLE 2

SureLight BOARD J58 (J1) TERMINAL

DESIGNATIONS

5/16"

TOP VIEW

FIGURE 8

SURELIGHT INTEGRATED CONTROL BOARD

GHR32−1 through −4 units

PIN # FUNCTION

1 Primary Limit In

Pressure Switch and Primary Limit Out

Gas Valve Common

Roll Out Switch Out

Gas Valve 24V

Pressure Switch In

Not Used

Roll Out Switch In

Ground

TABLE 3

ACB COOL ACB HEAT PARK ACB LOW ACC TX HOT HTG ACC NEUTRALS 24VAC HOT 24VAC RTN FLAME SENSE

TERMINAL DESIGNATIONS

Blower − Cooling Speed (Line Volt) Blower − Heating Speed (Line Volt) Alternate Blower Speeds (Dead) Continuous Low Speed Blower Accessory Terminal (Line Volt) 120VAC Hot to Transformer 120VAC Hot Input Heat Only Accessory (Line Volt) 120VAC Neutrals 24VAC Hot from Transformer 24VAC Return from Transformer Flame Sense Terminal

FIGURE 9

Page 10

TABLE 4

DIAGNOSTIC CODES

MAKE SURE TO ID LED’S CORRECTLY: REFER TO INSTALLATION INSTRUCTIONS FOR CONTROL BOARD LAYOUT.

LED #1 LED #2 DESCRIPTION

SIMULTANEOUS

SLOW FLASH

SIMULTANEOUS FAST

FLASH

SLOW FLASH ON

OFF SLOW FLASH

ALTERNATING SLOW

FLASH

SLOW FLASH OFF

ON SLOW FLASH

ON ON

OFF

FAST FLASH SLOW FLASH

SLOW FLASH FAST FLASH

ALTERNATING FAST

FLASH

SIMULTANEOUS

SLOW FLASH

SIMULTANEOUS FAST

ALTERNATING SLOW

ALTERNATING FAST

FLASH

OFF

FLASH

Also signaled during cooling and continuous fan.

Normal operation − signaled when heating demand initiated at thermostat.

Primary or Secondary limit open. Limit must close within 3 minutes or board goes

Watchguard pressure switch − 5 minutes. Pressure switch open or has opened 5 times during a single call for heat; OR: Blocked inlet/exhaust vent; OR: Conden-

sate line blocked; OR: Pressure switch closed prior to activation of combustion

Watchguard 60 minute delay − burners fail to ignite.

Flame sensed without gas valve energized.

Rollout switch open. OR: 9 pin connector improperly attached.

Circuit board failure or control wired incorrectly.

Main power polarity reversed. Switch line and neutral.

Low flame signal. Measures below .61 microAmps. Replace flame sense rod.

Improper main ground or line voltage below 75 volts; OR: Broken ignitor; OR:

Power − Normal operation

into one hour limit Watchguard.

air blower.

Open ignitor circuit.

NOTE − Slow flash equals 1 Hz (one flash per second). Fast flash equals 3 Hz (three flashes per second). Drop out flame sense current < 0.21 microAmps

a−Electronic Ignition Figures 12 and 13

On a call for heat the SureLight control monitors the combustion air blower pressure switch. The control will not begin the heating cycle if the pressure switch is closed (by− passed). Once the pressure switch is determined to be open, the combustion air blower is energized. When the differential in the pressure switch is great enough, the pressure switch closes and a 15−second pre−purge begins. If the pressure switch is not proven within 2−1/2 minutes, the control goes into Watchguard−Pressure Switch mode for a 5−minute re−set period. 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. Units with control 97L48: ignitor stays energized during the trial or until flame is sensed. Units with control 56L83: ignitor stays energized for the first second of the 4−second trial. If ignition is not

The SureLight control board has an added feature that prolongs 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.

b−Fan Time Control Q Models Only

The fan on time of 45 seconds is not adjustable. Fan off time (time that the blower operates after the heat demand has been satisfied) can be adjusted by flipping the dip switches located on the SureLight integrated control. The unit is shipped with a factory fan off setting of 90 seconds. Fan off time will affect comfort and is adjustable to satisfy individual applications. See figure 10.

proved during the 4−second period, the control (97L48 or 56L83) will try four more times with an inter purge and warm−up time between trials of 35 seconds. After a total of five trials for ignition (including the initial trial), the control

FAN-OFF TIME ADJUSTMENT

60sec. 90sec. 120sec. 180sec.

goes into Watchguard−Flame Failure mode. After a 60−minute reset period, the control will begin the ignition sequence again.

To adjust fan−off timing, flip dip switch to desired setting.

FIGURE 10

Page 11

c−Flame Sensor

ЙЙЙЙЙЙЙЙЙ

A flame sensor is located on the left side of the burner support. See figure 11. The sensor is mounted on a bracket in the burner support and the tip protrudes into the flame envelope of the left−most burner. The sensor is fastened to burner supports and can be removed for service without removing any part of the burners. During operation, flame is sensed by current passed through the flame and sensing electrode. The SureLight control allows the gas valve to remain open as long as flame signal is sensed.

SENSOR

3/8"

IGNITOR

FIGURE 11

NOTE − The GHR32 furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

5. Two−Stage Control (A86)

All GHR32−1 through −4 units are equipped with a two− stage control board. Two different boards have been used. Boards 43K9001 and 29M9201 (figure 14) are identical, except the 9 pin connector on 43K9001 is replaced by two relays with quick connect terminals on board 29M9201. The two−stage board acts as a go between from the indoor thermostat to the SureLight ignition board. The board can be utilized in three modes: with a SINGLE−STAGE thermostat, a TWO−STAGE thermostat or with a second−stage (high fire) delay called W2 TIMED. The two−stage board is equipped with a jumper (see figure 14) which changes operating modes and a jumper which adjusts second−stage heat delay during W2 TIMED mode.

NOTE−The mode of operation jumper on the two−stage control board is factory set in the TWO−STAGE" position.

While in the single−stage thermostat mode (one−stage jumper setting), the unit will always operate on second− stage heat. The combustion air blower (B6) will operate on high speed and indoor blower (B3) will operate on heating speed. While in the two−stage thermostat mode the unit will operate on first−stage heat (low fire). The combustion air blower (B6) and indoor blower will operate on low speed. The unit will switch to second−stage heat (high fire) on call from the indoor thermostat W2. While in the W2 TIMED mode (factory setting 8 minutes) the unit will fire on first− stage heat (low fire) with the combustion air blower (B6) and indoor blower (B3) operating on low speed. After a set time delay the unit switches to second−stage heat (high fire). The combustion air blower and indoor blower also switch to second−stage heat mode.

SureLight Control Ignition Sequence Board 56L8301

OFF

DEMAND

CAB IGNITOR GAS VALVE INDOOR BLOWER

*Blower on time will be 45 seconds after gas valve is energized. Blower off time will depend on OFF TIME" Setting.

Pre −Purge Ignitor Warmup Trial for

341

Ignition

Blower On"

Delay

FIGURE 12

SureLight Control Ignition Sequence Board 97L4801

OFF

DEMAND

CAB IGNITOR GAS VALVE INDOOR BLOWER

*Blower on time will be 45 seconds after gas valve is energized. Blower off time will depend on OFF TIME" Setting.

Pre −Purge Ignitor Warmup

341

Trial for Ignition

Blower On"

Delay

FIGURE 13

5 SEC80

Post

Purge

5 SEC80

Post

Purge

Page 12

MODE OF

OPERATION

JUMPER

TWO−STAGE CONTROL BOARD

G32(V) −1 through −4 units

W2 TIMED DELAY JUMPER

6.VSP2−1 Blower Control Board (A24)

−1 through −3 V Models only

GHR32V−1 through −3 units are equipped with a variable speed motor that is capable of maintaining a specified CFM throughout the external static range. The unit uses the VSP2−1 variable speed control board, located in the blower compartment, which controls the blower speed and provides diagnostic LEDs. The control has a non−adjustable, factory preset ON" fan timing delay and an adjustable OFF" fan timing delay (see figure 17).

The VSP2−1 also senses limit trip condition and turns on the blower. The GHR32 primary limit switch is located in the middle of the vestibule wall and the secondary limit switch is located int ehblower compartment. When excess heat is sensed in the heat exchanger, or blower compartment, the respective switch will open and interrupt the current to the gas valve, while at the same time the VSP2−1 energizes the blower on heating speed. The limit automatically resets when the unit temperature returns to normal and the blower is de−energized.

FIGURE 14

HIGH SPEED

SELECTOR PINS

(COOLING ONLY)

LOW SPEED

SELECTOR PINS

(COOLING, HEATING and

CONTINUOUS FAN)

HEATING STAGE

JUMPER SELECTOR PINS

JP73

15 PIN PLUG (BOARD TO VARIOUS POINTS IN FURNACE)

Diagnostic LEDs located on the VSP2−1 control board are provided to aid in identifying the unit’s mode of operation. Certain scenarios will arise depending on the jumper positions. Refer to figure 15 for identification.

VSP2−1 VARIABLE SPEED CONTROL BOARD SELECTIONS

JP 2

HIGH LOW ADJUST HEAT

270

DS4

CFM

210

150

JP 1

HTG.

BLOWER

HEAT

DS2

TEST

−

NORM

DS3

ON/OFF

HI/LOW

DS1

JP46

13 PIN PLUG

(BOARD TO MOTOR)

HEATING SPEED

SELECTOR PINS

See table 5 for VSP2

factory settings

OPERATIONAL

SELECTOR PINS

(Affects both heating and

cooling modes)

DIAGNOSTIC

DS LEDS

FAN OFF"

TIMING PINS

FIGURE 15

Page 13

IMPORTANT

24 VAC half wave rectified (DC pulse), when measured with a meter, may appear as a lower or higher voltage depending on the make of the meter. Rather than attempting to measure the output voltage of the VSP2 board, see GHR32 BLOWER & VSP2 BLOWER CONTROL BOARD TROUBLESHOOTING FLOW CHART in the TROUBLESHOOTING section of this manual.

VSP2−1 BLOWER CONTROL BOARD (A24)

J46

HIGH LOW ADJUST HEAT

1 2 3 4

HTG.

BLOWER

1 2 3 4

HEAT

DS3

TEST

− + NORM

HI/LOW

1 2 3 4

DS4

Diagnostic LED Lights

a − DS3 ON/OFF"

ON/OFF−DS3 indicates there is a demand for the blower mo-

tor to run. When the ON/OFF LED−DS3 is lit, a demand is being sent to the motor. In heating mode only, there is a 45 second fan ON" delay in energizing ON/OFF LED−DS3. The light will not go off until adjustable fan OFF" delay has expired.

If ON/OFF LED−DS3 is on and both HIGH/LOW LED−DS1 & HEAT LED−DS2 are off, the motor will operate in low speed.

b − DS2 HEAT"

If HEAT LED−DS2 is on, the blower is running in the heat speed according to the HEAT" jumper setting. The HEAT LED−DS2 comes on instantaneous and switches off when the call for heat is satisfied.

NOTE−When the blower is in OFF" delay mode, the motor runs at low speed, therefore the HEAT LED−DS2 is off. It switches off when the call for heat is satisfied.

c − DS1 HI/LOW"

ON/OFF

J73

PIN 2 - G - Input signal from thermostat’s fan signal.

PIN 3 - W2 - Input signal for second stage heat from the thermostat.

PIN 4 - DS - Input signal for the blower speed regulation.

PIN 5 - Limit - Input signal from the external limit.

PIN 6 - R - 24 VAC power to the thermostat.

PIN 9 - CI - Input signal from the fan limit control. PIN 10 - CO - Output signal to the burner control.

PIN 11 - HT - Input signal from the fan limit control.

PIN 12 - ACC - 24 VAC accessory output. PIN 13 - 24V - Input 24 VAC power for the VSP2-1. PIN 14 - 24V - Input 24 VAC power for the VSP2-1.

PIN 15 - V - Input signal from the gas line.

PIN 1 - Heat - Heat speed input signal to the ICM2 motor.

PIN 4 - High Tap - High Speed programming input.

PIN 5 - Low Tap - Low speed programming input.

PIN 6 - On / Off - On / off output signal to the ICM2 motor.

PIN 7 - Adjust Tap - ICM2 mode selection.

PIN 8 - Hi / Low - Speed regulate input signal to the ICM2 motor.

PIN 9 - Hi / Low - Speed regulate input signal to the ICM2 motor.

PIN 10 - Ref. V - ICM2 reference voltage.

PIN 11 - Heat Tap - Heating blower speed programming.

PIN 13 - cfm - Motor speed diagnostic signal.

DS2

PIN 1 - C - 24 VAC common.

PIN 7 - C - 24 VAC common.

Pin 8 - C - 24 VAC common.

PIN 2 - C - 24 VAC common. PIN 3 - C - 24 VAC common.

PIN 12 - C - 24 VAC common.

J73

J46

DS1

270

CFM

210

150

HIGH/LOW LED−DS1 indicates whether the blower is operating in high or low speed. When the light is off, the blower is running in low speed according to the LOW" jumper setting. When HIGH/LOW LED−DS1 is on, the blower is op- erating in high speed according to the HIGH" jumper setting.

d − DS4 CFM"

CFM LED−DS4 indicates the CFM the unit is operating,

according to the jumper settings. The light flashes once for approximately every 100 CFM. For example, if the unit is operating at 1000 CFM, CFM LED−DS4 will flash 10 times. If the CFM is 2050, CFM LED−DS4 will flash 20 full times plus one fast or half flash. At times the light may appear to flicker or glow. This takes place when the control is communicating with the motor between cycles. This is normal operation.

The appropriate speed according to application and CFM need is selected by moving jumper pins.

Page 14

VOLTAGES INTO VSP2−1

Voltage across J73 pins 13 to 1 and 6 to 1 is 24VAC as shown here.

34 volts

0 volts

−34 volts

Voltage across J73 pins 4 to 1 is approximately 15-20VDC (straight voltage) if CCB

is used. If Harmony is used a voltage of 0−25VDC should be present.

If CCB or Harmony is not used, pin 4 to 1 voltage is 21VAC.

Refer to unit wiring diagram.

24VAC @ 60Hz.

VOLTAGES FROM VSP2−1 TO ELECTRONICALLY

CONTROLLED BLOWER MOTOR

Voltage across J46 pins 6 to 3 and 1 to 3 is half-rectified AC as shown here.

Approx.

34 volts

0 volts

Voltage across J46 pins 8 and 9 to 3, is approximately 15-20VDC if CCB is used. If CCB or

Harmony is not used, pins 8 and 9 to 3 voltage is approximately 21VAC. If Harmony is used

Refer to unit wiring diagram.

24VAC Half-Rectified (DC Pulse)

a voltage of 0−25VDC should be present.

@ 60Hz.

FIGURE 16

NOTE−On Harmony II zoning applications in the heating mode, the highest speed obtainable is the same as the highest cooling speed selection. Also, the heating speed (heat jumper position) is only used when the primary limit has been tripped. In non−zoning applications, refer to the section on the VSP2−1 control.

Jumper Settings

SEE BLOWER PERFORMANCE TABLES AT FRONT

OF MANUAL FOR ANY REFERENCE TO CFM.

not operable. Notice in the GHR32V5−100 table, that the normal adjustment setting for heat speed position #3 is 2150 CFM (1015L/s). After the adjustment setting has been determined, c hose th e re main ing speed jumper settings from those offered in the table.

The TEST pin is available to bypass the VSP2−1 control and run the motor at approximately 70% to test that the moto r i s operational. This is beneficial primarily in troubleshooting. G must be energized for motor to run.

b−HEATING BLOWER"

IMPORTANT

Before changing jumper setting, make sure the motor has completely stopped. Any jumper setting change will not take place while the motor is running.

To change jumper positions, gently pull the jumper off the pins and place it on the desired set of pins. The following section outlines the different jumper selections available and conditions associated with each one. Refer to figure 15 for identification.

After the CFM for each application has been determined, the jumper settings must be adjusted to reflect those given in the tables in the blower performance section. Using the tables, determine which row of CFM volumes most closely matches the desired CFM. Once a specific row has been chosen (NORMAL or −), CFM volumes from other rows cannot be used. Below are the descriptions of each of the jumper selections.

Refer to table 5 for factory settings. Refer to the blower performance tables for the approximate air volume for each setting.

VSP2−1 FACTORY SETTINGS

MODEL HIGH LOW ADJUST HEAT

GHR32V−75−

1, −2, −3 units

GHR32V−100

−1, −2, −3 units

a−ADJUST"

The ADJUST pins allow the motor to run at normal speed or approximately 15% lower than normal speed. The blower performance tables give two rows (NORMAL and −) with their respective CFM volumes. The + adjustment setting i s

TABLE 5

4 3 NORM 2

4 2 NORM 1

For GHRV32 units, place the HEATING BLOWER jumper across the second and third pins (position #2).

When W1 is energized, the LOW jumper selections are activated. The HEAT jumper selections are activated when W2 is energized.

NOTE−In Harmony II zoning applications, HEATING BLOWER jumper must be in position #2.

c−HEAT"

The HEAT jumper is used to set the blower speed to ob- tain the required CFM as outlined in HEAT SPEED in the blower performance tables.

The HEAT jumper selections are activated with a call for second-stage heating (W2).

d−HIGH"

The HIGH jumper is used to determine the CFM during cooling speed. These jumper selections are activated when G and DS terminals are energized.

e−LOW"

The LOW jumper is used to determine CFM during low speed cooling. These jumper selections are activated when G is energized. The LOW jumper may also be used for low speed heating. See the HEAT" section for details.

f−FAN OFF"

Fan OFF" timings (time that the blower operates after the heat demand has been satisfied) are determined by the arrangement of a jumper on the VSP2−1 board. See figure

17. To adjust fan OFF" timings, gently disconnect the jumper and reposition it across pins corresponding with the new timing. Fan OFF" time is adjustable from 90 to 330 seconds. The control has a non−adjustable, factory preset on" fan timing (45 seconds).

WARNING − MAKE SURE TO DISCONNECT POWER BEFORE CHANGING FAN OFF" TIMINGS.

Page 15

FAN-OFF TIME ADJUSTMENT

NOTEIf fan OFF" time is too low, residual heat in heat exchanger may cause primary limit S10 to trip resulting

TIMING

JUMPER

To adjust fan−off timings:

Remove jumper from VSP2−1 and select

one of the other pin combinations to

achieve the desired time.

in frequent cycling of blower. If this occurs, adjust blower to longer time setting.

Table 6 outlines the operation of the variable speed motor in relation to specific modes of operation. Some informa-

270

150 90

210

Leave jumper off to achieve

330 second fan−off timing.

TIMING PINS (seconds)

Fan-off timing is factory

set at 90 seconds

tion has been repeated from the previous section to provide an example. Refer to each diagnostic LED or jumper settings section for more information.

FIGURE 17

TABLE 6

VSP2−1 GHR32−1 through −3 units OPERATION

HEATING MODE COOLING MODE

UNITS WITH

SINGLE−STAGE HEATING

NON−ZONED

APPLICATIONS

Using a single−stage thermostat with one−stage" heating, the HEAT LED− DS2 is lit when the thermostat calls for heat. The ON/OFF LED−DS3 is lit after 110 seconds (65 seconds pre−purge and 45 seconds fan ON" time) from the time a call for heat is made. This indicates the blower is operating in heating speed.

Using a single−stage thermostat with W2 TIMED," and W1 calling, the ON/ OFF LED−DS3 is lit to indicate the blower is operating on low speed.

When the HEAT LED−DS2 is lit, the blower is operating in heating speed, and second−stage (W2) heating is calling.

HARMONY ZONED

APPLICATIONS

The blower speed is controlled by the PWM (pulse width modulation) signal sent from the control center of the zoning system to the terminal strip’s DS terminal. HI/LOW LED−DS1 and ON/ OFF LED−DS3 are lit to indicate the blower is operating.

NOTE−In Harmony II zoning applications, HTG. BLOWER jumper must be in position #2.

NOTE: For zone applications with Harmony, remove the wire from the pin #3 of the J73 terminal on the VSP control board, insulate the end, and secure it to prevent from shorting.

Using a two−stage thermostat with first−stage (W1) calling, the ON/OFF LED−DS3 is lit to indicate the blower is operating in low speed.

When the ON/OFF LED−DS3 and HEAT LED−DS2 are lit, the blower is operating in heating speed and second−stage (W2) heating is calling.

HEAT LED−DS2 is lit with a call for heat from the thermostat. ON/OFF LED− DS3 is lit after 110 seconds from the time a call for heat is made.

NOTE−In Harmony II zoning applications, HTG. BLOWER jumper must be in position #2.

UNITS WITH

TWO−STAGE HEATING

NON−ZONED

APPLICATIONS

HARMONY ZONED

APPLICATIONS

UNITS WITH SINGLE−

SPEED COMPRESSOR

NON−ZONED

APPLICATIONS

The terminals DS and Y must be jumpered together. With a call for cooling, terminals G, Y and DS on the unit control board are energized from the thermostat. HI/LOW LED−DS1 and ON/OFF LED−DS3 are lit to indicate the blower is operating on high speed.

NOTEY and DS are factory jumpered for single−stage cooling, non− zoned applications.

NOTEFor low speed during single− stage cooling remove jumper from Y to DS.

HARMONY ZONED

APPLICATIONS

The blower speed is controlled by the PWM (pulse width modulation) signal sent from the control center of the zoning system to the terminal strip’s DS terminal. HI/LOW LED−DS1 and ON/OFF LED−DS3 are lit to indicate the blower is operating.

UNITS WITH TWO−SPEED

COMPRESSOR

NON−ZONED

APPLICATIONS

The ON/OFF LED−DS3 is lit to indicate the blower is operating in first stage cooling. This LED is energized on when a 24VAC thermostat demand is supplied to the control (terminal G" on the control board terminal strip).

In second stage, the ON/OFF LED− DS3 and HI/LOW LED−DS1 are lit to indicate the blower is operating on high speed (24VAC is supplied to the unit terminal strip Y2 from Y2 on the thermostat).

NOTE Jumper must be moved from Y1 to Y2 In two−speed, non−zoned applications.

HARMONY ZONED

APPLICATIONS

Page 16

7.VSP3−1 Blower Control Board (A24) GHR32V−4 Units

GHR32V−4 units are equipped with a variable speed motor that is capable of maintaining a specified CFM throughout the external static range. The unit uses the VSP3−1 variable speed control board, located in the blower compartment, which controls the blower speed and provides diagnostic LEDs. The control has both a non−adjustable, factory preset ON" fan timing delay and an adjustable OFF" fan timing delay (see figure 17).

VSP3−1 VARIABLE SPEED CONTROL BOARD SELECTIONS

JP2

DELAY PROFILE SELECTOR PINS

(COOLING ONLY)

DELAY COOL ADJUST HEAT

The VSP3−1 also senses limit trip condition and turns on the blower. The GHR32V limit switch is located in the middle of the vestibule wall. When excess heat is sensed in the hea t exchanger, the limit switch will open and interrupt the current to the gas valve, while at the same time the VSP3−1 energizes the blower on heating speed. The limit automatically resets when the unit temperature returns to normal and the blower is de−energized.

Diagnostic LEDs located on the VSP3−1 control board are provided to aid in identifying the unit’s mode of operation. Certain scenarios will arise depending on the jumper positions. Refer to figure 18 for identification.

JP46

13 PIN PLUG

(BOARD TO MOTOR)

TEST

−

NORM

HEATING SPEED SELECTOR PINS

See table 7 for VSP3−1

factory settings

COOL SPEED

SELECTOR PINS

(COOLING, HEATING and

CONTINUOUS FAN)

HEATING STAGE

JUMPER SELECTOR PINS

JP73

15 PIN PLUG (BOARD TO VARIOUS POINTS IN FURNACE)

JP1

HTG.

BLOWER

HEAT

DS2

ON/OFF

FIGURE 18

DS3

HI/LOW

DS1

270

210

150

DS4

CFM

OPERATIONAL

SELECTOR PINS

(Affects both heating

and cooling modes)

DIAGNOSTIC

DS LEDS

FAN OFF"

TIMING PINS

Page 17

VSP3−1 BLOWER CONTROL BOARD (A24)

J46

DELAY COOL ADJUST HEAT

1 2 3 4

HTG.

BLOWER

1 2 3 4

HEAT

DS3

TEST

− + NORM

HI/LOW

1 2 3 4

DS4

IMPORTANT

24 VAC half wave rectified (DC pulse), when measured with a meter, may appear as a lower or higher voltage depending on the make of the meter. Rather than attempting to measure the output voltage of A24, see GHR32V BLOWER & VSP3 BLOWER CONTROL BOARD TROUBLESHOOTING FLOW CHART in the TROUBLESHOOTING section of this manual.

ON/OFF

J73

PIN 2 - G - Input signal from thermostat’s fan signal.

PIN 3 - W2 - Input signal for second stage heat from the thermostat.

PIN 4 - DS - Input signal for the blower speed regulation.

PIN 5 - Limit - Input signal from the external limit.

PIN 6 - R - 24 VAC power to the thermostat.

PIN 9 - CI - Input signal from the fan limit control. PIN 10 - CO - Output signal to the burner control.

PIN 11 - HT - Input signal from the fan limit control.

PIN 12 - ACC - 24 VAC accessory output. PIN 13 - 24V - Input 24 VAC power for the VSP2-1. PIN 14 - 24V - Input 24 VAC power for the VSP2-1.

PIN 15 - V - Input signal from the gas line.

PIN 4 - Delay Tap - Delay profile programming input.

PIN 5 - Cooling blower speed programming input.

PIN 6 - On / Off - On / off output signal to the ICM2 motor.

PIN 7 - Adjust Tap - ICM2 mode selection.

PIN 9 - Hi / Low - Speed regulate input signal to the ICM2 motor with CCB1 and

PIN 10 - Ref. V - ICM2 reference voltage.

PIN 11 - Heat Tap - Heating blower speed programming.

PIN 13 - cfm - Motor speed diagnostic signal.

DS2

PIN 1 - C - 24 VAC common.

PIN 7 - C - 24 VAC common.

Pin 8 - C - 24 VAC common.

PIN 2 - C - 24 VAC common. PIN 3 - C - 24 VAC common.

PIN 12 - C - 24 VAC common.

J73

J46

PIN 1 - Not Used.

PIN 8 - NOT USED

HARMONY only

DS1

270

CFM

210

150

Diagnostic LED Lights

DS3 ON/OFF

ON/OFF−DS3 indicates there is a demand for the blower

motor to run. When the ON/OFF LED−DS3 is lit, a demand is being sent to the motor. In heating mode only, there is a 45−second fan ON" delay in energizing ON/OFF LED− DS3. Light will not go off until adjustable fan OFF" delay has expired.

If ON/OFF LED−DS3 is on and both HIGH/LOW LED−DS1 & HEAT LED−DS2 are off, the motor will operate in low speed (heating).

DS2 HEAT

If HEAT LED−DS2 is on, the blower is running in second− stage heat speed according to the HEAT" jumper setting. In heating mode only, there is a 45 second delay in energizing HEAT LED−DS2. Light will not go off until adjustable fan OFF" delay has expired.

DS1 HI/LOW

HIGH/LOW LED−DS1 indicates the blower is operating in

the cooling mode.

DS4 CFM

CFM LED−DS4 indicates the CFM the blower is providing,

according to the jumper settings.

VOLTAGES INTO VSP3−1

Voltage across J73 pins 13 to 1 and 6 to 1 is 24VAC as shown here.

34 volts

volts

−34 volts

Voltage across J73 pins 4 to 1 is approximately 15-20VDC (straight voltage) if CCB is used. If Harmony is used a voltage of 0−25VDC should be present.

If CCB or Harmony is not used, pin 4 to 1 voltage is 21VAC.

Refer to unit wiring diagram.

24VAC @ 60Hz.

VOLTAGES FROM VSP3−1 TO ELECTRONICALLY

CONTROLLED BLOWER MOTOR

Voltage across J46 pins 6 to 3 and 1 to 3 is half-rectified AC as shown here.

Approx. 34 volts

volts

Voltage across J46 pin 9 to 3 is approximately 15-20VDC if CCB is used. If CCB or

Harmony is not used, pin 9 to 3 voltage is approximately 21VAC. If Harmony is used

Refer to unit wiring diagram.

a voltage of 0−25VDC should be present.

24VAC Half-Rectified (DC

FIGURE 19

Pulse)

@ 60Hz.

Page 18

Jumper Settings

SEE BLOWER PERFORMANCE TABLES AT FRONT

OF MANUAL FOR ANY REFERENCE TO CFM.

IMPORTANT

Before changing jumper setting, make sure the motor has completely stopped. Any jumper setting change will not take place while the motor is running.

After the CFM for each application has been determined, the jumper settings must be adjusted to reflect those given in the blower performance tables. Using the tables, determine which row of CFM volumes most closely matches the desired CFM. Once a specific row has been chosen (NORMAL or −), CFM volumes from other rows cannot be used. Below are the descriptions of each of the jumper selections.

Refer to table 7 for factory settings.

TABLE 7

VSP FACTORY SETTINGS FOR GHR32V−4 UNITS

MODEL DELAY COOL ADJUST HEAT

GHR32V3−75 4 4 NORM 3

GHR32V5−100 4 4 NORM 2

NOTE − In Harmony II zoning applications in the heating mode, the highest cooling speed selected is the highest blower speed obtainable. Also, the fan−only speed is used when the primary limit has been tripped. In non−zoning applications, refer to the section on the VSP3−1 control.

ADJUST

The ADJUST pins allow the motor to run at normal speed or approximately 15% lower than normal speed. The blower performance tables two rows (NORMAL and −) with their respective CFM volumes. The + adjustment setting is not operable. Notice that the normal adjustment setting for heat speed position #3 is 2150 CFM (1015 L/s) . After the adjustment setting has been determined, choose the remainder speed jumper settings from those in the table.

The TEST pin is available to bypass the VSP3−1 control and run the motor at approximately 70% to test that the motor is operational. This is beneficial primarily in troubleshooting. G must be energized for motor to run.

HTG. BLOWER

For GHR32V−4 units only, place the HTG. BLOWER jumper across the second and third pins (position #2).

NOTE − In Harmony II zoning applications, HTG. BLOWER jumper must be in position #2.

HEAT

The HEAT jumper is used to set the blower speed to obtain the required CFM as outlined in HEAT SPEED section of the blower performance tables. The HEAT jumper selec- tions are activated with a call for first−stage heating (W1) and second−stage heating (W2).

DELAY

The DELAY jumper is used to set the specific motor fan mode of operation during cooling. Depending on the application, one of four fan options may be chosen by moving the jumper to the appropriate set of pins.

Options 1, 2, 3, or 4 will have an increased dehumidification effect on the system. Option 1 will have the least effect and option 4 will have the greatest effect.

#1 PIN JUMPERED

A − Motor runs at 100% until demand is satisfied. B − Once demand is met, motor ramps down to off.

A B

100% CFM

COOLING DEMAND

OFFOFF

#2 PIN JUMPERED

A − Motor runs at 82% for approximately 7−1/2 minutes. B − If demand has not been satisfied after 7−1/2 minutes,

the motor runs at 100% until demand is satisfied.

C − Once demand is met, motor ramps down to off.

OFF

7 1/2 MIN

82%CFM

100% CFM

COOLING DEMAND

#3 PIN JUMPERED A − Motor runs at 50% for 1/2 minute. B − Motor then runs at 82% for approximately 7−1/2 min-

utes.

C − If demand has not been satisfied after 7−1/2 minutes,

motor runs at 100% until demand is satisfied.

D − Once demand is met, motor ramps down to off.

C D

100% CFM

OFF

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COOLING DEMAND

Page 19

#4 PIN JUMPERED A − Motor runs at 50% for 1/2 minute. B − Motor then runs at 82% for approximately 7−1/2 min-

utes.

C − If demand has not been satisfied after 7−1/2 minutes,

motor runs at 100% until demand is satisfied.

D − Once demand is met, motor runs at 50% for 1/2 min-

ute.

E − Motor ramps down to off.

C D

100% CFM

1/2 MIN 50% CFM

OFF

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COOLING DEMAND

COOL

The cool jumper is used to set the blower speed to obtain the required CFM as outlined in the blower performance tables.

VSP Operation

Table 8 outlines the operation of the variable speed motor in relation to specific modes of operation. See table 9 for GHR32V with CCB1 and a two speed outdoor unit. Some information has been repeated from the previous section to provide an example. Refer to each diagnostic LED or jumper settings section for more information.

Heating Mode Cooling Mode

Units With

Single−Stage Heating

Non−Zoned Applications

Using a single−stage thermostat with "one−stage" heating, the HEAT LED−DS2 is lit when the thermostat calls for heat. The ON/OFF LED− DS3 is lit after 110 seconds (65 seconds prepurge and 45 seconds fan "ON" time) from the time a call for heat is made. This indicates the blower is operating in high speed heat.

Using a single−stage thermostat with "W2 TIMED" and W1 calling, the ON/OFF LED−DS3 is lit to indicate the blower is operating on low speed heat.

When HEAT LED−DS2 is lit, the blower is operating in high speed heat and second−stage (W2) is calling.

Harmony Zoned Applications

The blower speed is controlled by the PWM (pulse width modulation) signal sent from the control center of the zoning system to the terminal strip’s DS terminal. HI/LOW LED− DS1 and ON/OFF LED−DS3 are lit to indicate the blower is operating.

Note − In Harmony II zoning applications, HTG BLOWER jumper must be in position #2.

GHR32V−4 Units with VSP3−1

TABLE 8

Units With

Two−Stage Heating

Non−Zoned Applications

Using a two−stage thermostat with first−stage (W1) calling, the ON/ OFF LED−DS3 is lit to indicate the blower is operating in low speed heat.

When the ON/OFF LED−DS3 and HEAT LED−DS2 are lit, the blower is operating in high speed heat and second−stage (W2) is calling.

HEAT LED−DS2 is lit with a call for heat from the thermostat. ON/OFF LED−DS3 is after 110 seconds from the time a call for heat is made.

Harmony Zoned Application

The blower speed is controlled by the PWM (pulse width modulation) signal sent from the control center of the zoning system to the terminal strip’s DS terminal. HI/LOW LED− DS1 and ON/OFF LED−DS3 are lit to indicate the blower is operating.

Note − In Harmony II zoning applications, HTG BLOWER jumper must be in position #2.

Units With

Single−speed Compressor

Non−Zoned Applications

Y1−DS and Y1−Y2 must be jumpered together. With a call for cooling, G, Y1, Y2 and DS on the unit control board are energized from the thermostat. HI/LOW LED−DS1 and ON/OFF LED−DS3 are lit to indicate a call for cooling.

Note − Y1 to DS and Y1 to Y2 are factory jumpered for single−stage cooling, non−zoned applications.

Harmony Zoned Application

The blower speed is controlled by the PWM (pulse width modulation) signal sent from the control center of the zoning system to the terminal strip’s DS terminal. HI/LOW LED−DS1 and ON/OFF LED−DS3 are lit to indicate the blower is operating.

Units With

Two−speed Compressor

Non−Zoned Applications

Y1−DS must be jumpered together. With a call for single−stage cooling, G, Y1, and DS on the unit control board are energized from the Thermostat. With a call for second−stage cooling, G, Y1, Y2, and DS on the unit control board are energized from the thermostat. In both cases, HI/LOW LED−DS1 and ON/OFF LED−DS3 are lit to indicate a call for cooling.

Note − Jumper Y1−Y2 must be removed for units with two−speed compressor.

Harmony Zoned Application

The blower speed is controlled by the PWM (pulse width modulation) signal sent from the control center of the zoning system to the terminal strip’s DS terminal. HI/LOW LED− DS1 and ON/OFF LED−DS3 are lit to indicate the blower is operating.

NOTE − For zone applications with Harmony, remove the wire from pin #2 and pin #13 of the J49 terminal at the motor and the wire from pin #3 of the J73 terminal on the VSP control board, insulate the ends and secure to prevent shorting.

Page 20

TABLE 9

Normal operation

blower speed follow thermostat

removal during 1st

ifi

ill i

When humidity demand is satisfied

satisfied during

gp p

Call f

idit

Call for 1st stage

Call for 2nd stage

Reduced blower speed (dehumidifi-

mostat demand), slide switch is

GHR32V−4 UNITS WITH CCB1 & TWO−SPEED OUTDOOR UNIT OPERATING SEQUENCE

Operating Sequence System Demand System Response

System

Condition

Step

Thermostat

Demand

*Relative Humidity

(EfficiencyPlus Lights)

***Compressor

Speed

Blower CFM

(COOL)

Comments

Normal operation

Call for humidity

removal during 1st

stage thermostat

demand

Significant increase

in humidity during

thermostat demand.

Humidity demand

satisfied during

thermostat demand.

or hum

removal during 2nd

stage thermostat

demand

*Call for 1st stage

cooling after call for

humidity removal.

Call for 2nd stage

cooling after call for

humidity removal

Call for cooling after

significant increase

in humidity

Humidity demand satisfied between

thermostat demands

(unit off cycle).

1 Y1 Acceptable (None) Low

2 Y2 Acceptable (None) High HIGH COOL

1 Y1 Acceptable (None) Low

2 Y1

Demand

satisfied

4 Y1 Slightly over setpoint (1) High

1 Y1 Acceptable (None) Low

2 Y1

1 Y1 Over Setpoint High

2 Y1

3 None Acceptable (None) Off Off

4 Y1 Acceptable (None) Low

1 Y2 Acceptable (None) High HIGH COOL

2 Y2

3 Y2 Acceptable (None) High HIGH COOL

1 None Slightly over setpoint (1) Off Off Dehumidification mode (high speed

2 Y1 Slightly over setpoint (1) Low

1 None Slightly over setpoint (1) Off Off

2 Y2 Slightly over setpoint (1) High

1 None

2 Y1 or Y2

1 None Over setpoint (1 or more) Off Off

2 Y1 or Y2

Change to slightly

over setpoint (1)

Slightly over setpoint (1) Off Off

Change to significantly

over setpoint (2 or more)

Change to Acceptable

(None)

Change to slightly

over setpoint (1)

Significantly over setpoint

(2 or more)

Significantly over

setpoint (2 or more

Change to

acceptable (None)

Low

High

High HIGH COOL

High

Off Off

High

High HIGH COOL

55% of

HIGH COOL

55% of

HIGH COOL

55% of

HIGH COOL

**77%/74% of

HIGH COOL

55% of

HIGH COOL

**77%/74% of

HIGH COOL

**77%/74% of

HIGH COOL

55% of

HIGH COOL

**77%/74% of

HIGH COOL

55% of

HIGH COOL

**77%/74% of

HIGH COOL

**77%/74% of

HIGH COOL

Compressor demand and indoor

blower s

Dehumidification mode begins with

next thermostat demand, after initial

thermostat demand is satisfied.

If humidity increases significantly

over setpoint, or if slide switch is

moved sign

ately go into dehumidification mode

(in presence of thermostat demand).

When humidity demand is satisfied

blower immediately shifts to the

HIGH COOL CFM in order to hasten

e end of the cycle. Unit can only

shift out of high speed compressor

operation at beginning of next cycle.

Blower immediately changes speed

in response to thermostat demand.

compressor) begins with next ther-

mostat demand after initial demand is

Reduced blower speed (dehumidifi-

cation speed) begins immediately

If humidity increases significantly

over setpoint, or if slide switch is

moved, unit immediately goes into

dehumidification mode (in presence

While unit is not operating (no ther-

mostat demand), slide switch is

moved down and back up. Blower

and compressor operate at high

speed until next thermostat demand.

eed follow thermostat

demand

cantly, u nit w

satisfied.

with thermostat demand

of thermostat demand).

mmedi-

Note − When changing unit mode of operation from cooling to heating, indicating lights that are on will stay on until the first thermostat heating demand.

*IMPORTANT - If power to unit is turned on with CCB1 calling for humidity removal, outdoor unit may be locked into high speed indefinitely. To reset, move humidity slide switch all the way down then back up to desired setpoint (with unit running) ** Reduced blower speed is 77% of COOL for the V3 units; 74% of COOL for V5. ***If the two−speed control on a two−speed outdoor unit is set for LATCH 2 (15 minutes) or LATCH 3 (30 minutes), the compressor will latch into high speed after a Y1 demand has occurred for that period of time.

Page 21

8.Two Stage Integrated Control (A92) GHR32Q−5 Units

DANGER

Shock hazard.

Disconnect power before servicing. Control 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.

All GHR32Q units are equipped with the Lennox two− stage integrated SureLight control board. The system consists of a ignition control board (figure 20 with control terminal designations in tables 12, 13 and 14) and ignitor (figure 8). The board and ignitor work in combination to ensure furnace ignition and ignitor durability. The board controls all major furnace operations. The board features two LED lights, DS1 and DS2 for troubleshooting. The board also has two accessory terminals rated at (1) one amp each. See table 15 for troubleshooting diagnostic codes.

Electronic Ignition

At the beginning of each heat cycle, 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 allow first stage heat only. However if the second stage prove switch closes during the first stage pre−purge, the control will still respond to second stage heat. Once the first stage prove switch is determined to be open, the combustion air inducer 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. 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 seconds. After a total of five trials for ignition (including the initial 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 prolongs 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 4 (figure 20), 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−position jumper to SINGLE" for use with a single stage thermostat 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 indoor blower will operate on low heat speed. After a field selectable 10 or 15 minute delay (dip switch 3), 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 combustion 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 W1 and W2 (first and second stage heat) the unit will fire on first stage heat and will 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.

Dip Switch Settings

Dip Switches 1 and 2 − Heating Fan off Delay − The fan on

time of 45 seconds is not adjustable. Fan off time (time that the blower operates after the heat demand has been satisfied) can be adjusted by flipping the dip switches 1 and 2 located on the SureLight integrated control. The unit is shipped with a factory fan off setting of 90 seconds. Fan off time will affect comfort and is adjustable to satisfy individual applications. For customized comfort, monitor the supply air temperature once the heat demand is satisfied. Note the supply air temperature at the instant the blower is de−energized. Adjust the fan−off delay to achieve a supply air temperature between 90° − 110° at the instant the blower is de− energized. (Longer delay times allow for lower air temperature, shorter delay times allow for higher air temperature). See table 10 for dip switch settings.

TABLE 10

Heating Fan Off Delay

Delay (Seconds)

60 Off Off

90 Off On 120 On Off 180 On On

Switch 3 − Second Stage Delay (Used with Single−Stage Thermostat Only) −− This switch is used to determine the

Switch 1 Switch 2

Page 22

it will provide a 15−minute delay before second−stage heat is initiated. This switch is only activated when the thermostat selector jumper is positioned for SINGLE−stage thermostat use.

Switch 4 − Cooling Fan off Delay − The fan on delay time of 2 seconds is not adjustable. Fan off time (time that the blower operates after the cool demand has been satisfied) can be adjusted by flipping dip switch 4. The unit is shipped with a factory fan off setting of 45 seconds. Fan off time will affect comfort and is adjustable to satisfy individual applications. See table 11 for cool fan off time settings.

TABLE 11

Cooling Fan Off Delay

Delay (Seconds) Switch 4

2 Off

45 On

Diagnostic LED’s (DS1 and DS2)

Two diagnostic LED’S are located on the two−stage integrated control board. See figure 20. These light flashes correspond with the codes detailed in table 15.

Factory Installed Jumper Y1 to Y2

A factory−installed jumper from Y1 to Y2 terminals on the integrated control board terminal strip must be removed for two−stage cooling.

TABLE 12

Integrated Control Board Terminals

120VAC Neutral

LINE Line

XFMR Transformer

EAC Electronic Air Cleaner

CIRC Indoor Blower

HUM Humidifier

120VAC Line

HUM Humidifier

XMFR Transformer

LINE Line

PARK For Unused Leads

COOL Cooling Speed

EAC Electronic Air Cleaner

HI HEAT High Heat Speed

LO HEAT Low Heat, Low Cool and Continuous Fan

Speed

TWO−STAGE INTEGRATED CONTROL BOARD

SWITCHES

SENSOR

FACTORY−

INSTALLED

JUMPER

THERMOSTAT CONNECTIONS (TB1)

DIP SWITCH(ES) FUNCTION

1 and 2 Blower Off Delay (Heating Mode)

3 Second Stage ON Delay (Single−stage t’stat) 4 Blower Off Delay (Cooling Mode)

FIGURE 20

LEDs

DIP

1 − 4

Page 23

TABLE 13

ONONON

Circuit board failure or control wired incorrectly. Check 24 and 115 volts to board.

Integrated Control Board 5 Pin Terminal

PIN # Function

1 Ignitor

2 Combustion Air Inducer High Speed

3 Combustion Air Inducer Low Speed

4 Combustion Air Inducer Neutral

5 Ignitor Neutral

Integrated Control Board 12Pin Terminal

PIN # Function

1 Gas Valve 2nd Stage (High Fire)

2 Second Stage Prove Switch

3 Not Used

4 Ground

5 24V Hot

6 Primary Limit In

7 Gas Valve 1st stage (Low Fire)

8 Gas Valve Common

9 24V Neutral

10 Ground

11 Primary Limit Out

12 1st Stage Prove Switch

TABLE 14

TABLE 15

DIAGNOSTIC CODES

Diagnostic LEDs are labeled DS1 and DS2. See figure 20 for location of diagnostic LEDs.

DS1 DS2 DESCRIPTION

SIMULTANEOUS

SLOW FLASH

SIMULTANEOUS

FAST FLASH

SLOW FLASH ON

OFF SLOW FLASH

OFF FAST FLASH

ALTERNATING

SLOW FLASH

SLOW FLASH OFF Flame sensed without gas valve energized.

ON ON

OFF ON

FAST FLASH SLOW FLASH Main power polarity reversed. Switch line and neutral.

SLOW FLASH FAST FLASH Low flame signal. Measures below 0.23 microAmps. Replace flame sense rod.

ALTERNATING

FAST FLASH

SIMULTANEOUS

SLOW FLASH

SIMULTANEOUS

FAST FLASH

ALTERNATING

SLOW FLASH

OFF

ALTERNATING

FAST FLASH

Power on − Normal operation. Also signaled during cooling and continuous fan.

Normal operation − signaled when heating demand initiated at thermostat.

Primary, secondary or rollout limit switch open. Limits must close within 3 minutes or unit goes into 1 hour Watchguard. Pressure switch open; OR: Blocked inlet/exhaust vent; OR: Pressure switch closed prior to activation of combustion air inducer.

Pressure switch open; OR: Blocked inlet/exhaust vent; OR: Pressure switch closed prior to activation of combustion air inducer.

Watchguard −− burners failed to ignite; OR limit open more than 3 minutes; OR lost flame sense 5 times in one heating cycle; OR pressure switch opened 5 times in one heating cycle.

Circuit board failure or control wired incorrectly. Check 24 and 115 volts to board.

The following conditions are sensed during the ignitor warm−up period only:

1) Improper main ground;

2) Broken ignitor; OR: Open ignitor circuit;

3) Line voltage below 75 volts. (If voltage lower than 75 volts prior to ignitor warm-up, control will signal waiting on call from thermostat, and will not respond.

NOTE − Slow flash rate equals 1 Hz (one flash per second). Fast flash rate equals 3 Hz (three flashes per second). Minimum flame sense current = 0.17−0.22 microAmps.

Page 24

9.Two Stage Variable Speed Integrated Control (A92) GHR32V−5 Units

All GHR32V−5 units are equipped with the Lennox two− stage, variable speed integrated SureLight control board. The system consists of a ignition / blower control board (figure 21 with control terminal designations in tables 16 through 19) and ignitor (figure 8). The board and ignitor work in combination to ensure furnace ignition and ignitor durability. The SureLight integrated board controls all major 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 20 for status code and table 21 for troubleshooting diagnostic codes.

Electronic Ignition

At the beginning of each heating 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 allow first stage heat only. However if the second stage prove switch closes during the first stage pre− purge, the control WILL respond to second stage heat call. Once the first stage prove switch is determined to be open, the combustion air inducer 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. 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 seconds. After a total of five trials for ignition (including the initial 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 prolongs 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 21), 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−position jumper to SINGLE" for use with a single stage thermostat 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 indoor blower will operate on low heat speed. After a field selectable 10 or 15 minute delay (dip switch 3), 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 combustion 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 W1 and W2 (first and second stage heat) the unit will fire on 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.

TABLE 16

Two Stage Ignition / Blower Control Terminals

120VAC Neutral

LINE Line 120VAC Neutral

XFMR Transformer 120VAC Neutral

EAC Electronic Air Cleaner 120VAC Neutral

CIRC Indoor Blower 120VAC Neutral

HUM Humidifier 120VAC Neutral

120VAC Line

HUM Humidifier 120VAC Hot

XMFR Transformer 120VAC Hot

LINE Line 120VAC Hot

CIRC Indoor Blower 120VAC Hot

EAC Electronic Air Cleaner 120VAC Hot

TABLE 17

SureLight Board 5 Pin Terminal Designation

PIN # Function

1 Ignitor

2 Combustion Air Inducer High Speed

3 Combustion Air Inducer Low Speed

4 Combustion Air Inducer Neutral

5 Ignitor Neutral

Page 25

TW0−STAGE, VARIABLE SPEED INTEGRATED

CONTROL BOARD

DIAGNOSTIC

LEDs

DS8

DS7

ON−BOARD

JUMPER W914

(cut when CCB1 or

Harmony II are used)

FACTORY−

INSTALLED

DS3

JUMPER

16 PIN BLOWER

CONTROL TERMINALS

(cut when heat pump

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

SWITCHES

ON−BOARD

JUMPER W951

is used with FM21)

DIP

1 − 3

E20

JUMPER

DIP

5 − 12

LED DS6

TABLE 18

SureLight Board 12Pin Terminal Designation

PIN # Function

1 Gas Valve 2nd. Stage (High Fire)

2 Second Stage Pressure Switch

3 Not Used

4 Ground

5 24V Hot

6 Primary Limit In

7 Gas Valve 1st. Stage (Low Fire)

8 Gas Valve Common

9 24V Neutral

10 Ground

11 Primary Limit Out

12 1st Stage Pressure Switch

TABLE 19

SureLight Board 16 Pin Blower Control Terminals

PIN # Function

1 Ground

2 Low Heat Speed

3 Ground

4 DELAY" Dip Switch Selection

5 COOL" Dip Switch Selection

6 Y1" Signal

7 ADJUST" Dip Switch Selection

8 Ground

9 O" From Thermostat

10 DS" Output Signal

11 HEAT" Dip Switch Selection

12 24 VAC

13 HIGH HEAT Speed

14 Y2" Signal

15 G"

16 CFM LED

FIGURE 21

Page 26

TABLE 20

ONONON

Circuit board failure or control wired incorrectly. Check 24 and 115 volts to board.

STATUS CODES

STATUS LED COLOR FUNCTION

DS3

ON / OFF ’

DS6

CFM"

DS7

HI / LO"

DS8

HEAT"

GREEN

YELLOW

YELLOW DS8−ON indicates the sytem is in HEAT mode.

DS3−ON indicates that the motor has a demand to operate. (This LED must be on in all modes).

DS6−blinking indicates the airflow (CFM) demand in the motor. The air flow is determined by counting blinks between two (2) second pauses. One blink equals roughly 100 CFM.

DS7−ON indicaties the DS to R" jumper has not been cut. When the jumper is cut the system will be operating with LENNOX HARMONY IIt (See Harmony Installation Instructions) or with the CCB1 Efficiency Plus control. CCB1: When ON, a 24 VAC is being applied and when OFF, it has been removed. This on/off operation varies the indoor blower’s performance so dehumidification can be enhanced.

TABLE 21

DIAGNOSTIC CODES

Diagnostic LEDs are labeled DS1 and DS2. See figure 21 for location of diagnostic LEDs.

DS1 DS2 DESCRIPTION

SIMULTANEOUS

SLOW FLASH

SIMULTANEOUS

FAST FLASH

SLOW FLASH ON

OFF SLOW FLASH

OFF FAST FLASH

ALTERNATING

SLOW FLASH

SLOW FLASH OFF Flame sensed without gas valve energized.

ON ON

OFF ON

FAST FLASH SLOW FLASH Main power polarity reversed. Switch line and neutral.

SLOW FLASH FAST FLASH Low flame signal. Measures below 0.23 microAmps. Replace flame sense rod.

ALTERNATING

FAST FLASH

SIMULTANEOUS

SLOW FLASH

SIMULTANEOUS

FAST FLASH

ALTERNATING

SLOW FLASH

OFF

ALTERNATING

FAST FLASH

Power on − Normal operation. Also signaled during cooling and continuous fan.

Normal operation − signaled when heating demand initiated at thermostat.

Pressure switch open; OR: Blocked inlet/exhaust vent; OR: Pressure switch closed prior to activation of combustion air inducer.

Watchguard −− burners failed to ignite; OR limit open more than 3 minutes; OR lost flame sense 5 times in one heating cycle; OR pressure switch opened 5 times in one heating cycle.

Circuit board failure or control wired incorrectly. Check 24 and 115 volts to board.

The following conditions are sensed during the ignitor warm−up period only:

1) Improper main ground;

2) Broken ignitor; OR: Open ignitor circuit;

3) Line voltage below 75 volts. (If voltage lower than 75 volts prior to ignitor warm-up, control will signal waiting on call from thermostat, and will not respond.

NOTE − Slow flash rate equals 1 Hz (one flash per second). Fast flash rate equals 3 Hz (three flashes per second). Minimum flame sense current = 0.17−0.22 microAmps.

Page 27

Dip Switch Settings Switches 1 and 2 − Blower Off Delay The blower−on delay

of 45 seconds is not adjustable. The blower−off delay (time that the blower operates after the heating demand has been satisfied) can be adjusted by moving switches 1 and 2 on the integrated control board. The unit is shipped from the factory with a blower−off delay of 90 seconds. The blower off delay affects comfort and is adjustable to satisfy individual applications. Adjust the blower off delay to achieve a supply air temperature between 90° and 110°F at the exact moment that the blower is de−energized. Longer off delay settings provide lower supply air temperatures; shorter settings provide higher supply air temperatures.The table below provides the blower off timings that will result from different switch settings.

TABLE 22

Blower Off Delay Switch Settings

Blower Off Delay

(Seconds)

Switch 1 Switch 2

60 Off Off

90 Off On 120 On Off 180 On On

Switch 3 − Second Stage Delay (Used with Single−Stage Thermostat Only) This switch is used to determine the

second stage on delay when a single−stage thermostat is being used. The switch is factory−set in the ON position, which provides a 10−minute delay before second−stage heat is initiated. If the switch is toggled to the OFF position, it will provide a 15−minute delay before second−stage heat is initiated. This switch is only activated when the thermostat selector jumper is positioned for SINGLE−stage thermostat use.

Switch 4 − Not used

Switches 5 and 6 − Cooling Mode Blower Speed

Switches 5 and 6 are used to select cooling blower motor speed. The unit is shipped from the factory with the dip switches positioned for high speed (4) indoor blower motor operation during the cooling mode. The table below provides the cooling mode blower speeds that will result from different switch settings. Refer to blower data tables at the front of this manual for corresponding cfm values.

Cooling Mode Blower Speeds

TABLE 23

Speed Switch 5 Switch 6

1 − Low On On

2 − Medium Low Off On

3 − Medium High On Off

4 − High (Factory) Off Off

Switches 7 and 8 − Blower Speed Adjustment Switches 7 and 8 are used to select blower speed adjustment settings. The unit is shipped from the factory with the dip switches positioned for NORMAL (no) adjustment. The dip switches may be positioned to adjust the blower speed by +10% or −10% to better suit the application. The table below provides blower speed adjustments that will result from different switch settings. Refer to blower data tables at the front of this manual for corresponding cfm values.

TABLE 24

Blower Speed Adjustment

Adjustment Switch 7 Switch 8

+10% (approx.) On Off

NORMAL (Factory) Off Off

−10% (approx.) Off On

Switches 9 and 10 − Cooling Mode Blower Speed Ramping −− Switches 9 and 10 are used to select cooling

mode blower speed ramping options. Blower speed ramping may be used to enhance dehumidification performance. The switches are factory set at option A which has the greatest effect on blower motor performance. The table below provides the cooling mode blower speed ramping options that will result from different switch settings. The cooling mode blower speed ramping options are detailed on the next page. See unit nameplate for manufacturing date.

TABLE 25

Cooling Mode Blower Speed Ramping

Ramping Option Switch 9 Switch 10

A (Factory) Off Off

B On Off C Off On

D* On On

*Only option for CCB1

Page 28

GHR32V units manufactured before April 2003

Ramping Option A (Factory Selection)

D Motor runs at 50% for 1/2 minute. D Motor then runs at 82% for approximately 7−1/2 min-

utes.

D If demand has not been satisfied after 7−1/2 minutes,

motor runs at 100% until demand is satisfied.

D Once demand is met, motor runs at 50% for 1/2 min-

ute.

D Motor ramps down to off.

GHR32V units manufactured April 2003 and later

Ramping Option A (Factory Selection)

S Motor runs at 50% for 30 seconds. S Motor then runs at 82% for approximately 7−1/2 min-

utes. If demand has not been satisfied after 7−1/2 minutes.

S Motor runs at 100% until demand is satisfied. S Once demand is met, motor runs at 50% for 30 sec-

onds then −

S ramps down to stop.

OFF

1/2 MIN 50% CFM

7−1/2 MIN 82% CFM

COOLING DEMAND

100% CFM

1/2 MIN 50% CFM

OFF

Ramping Option B

D Motor runs at 50% for 1/2 minute. D Motor then runs at 82% for approximately 7−1/2 min-

utes.

D If demand has not been satisfied after 7−1/2 minutes,

motor runs at 100% until demand is satisfied.

D Once demand is met, motor ramps down to off.

OFF

1/2 MIN 50% CFM

7−1/2 MIN 82% CFM

COOLING DEMAND

100% CFM

OFF

Ramping Option C

D Motor runs at 82% for approximately 7−1/2 minutes. D If demand has not been satisfied after 7−1/2 minutes,

the motor runs at 100% until demand is satisfied.

D Once demand is met, motor ramps down to off.

OFF

7−1/2 MIN

82%CFM

COOLING DEMAND

100% CFM

OFF

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COOLING DEMAND

100% CFM

1/2 MIN 50% CFM

OFF

Ramping Option B

S Motor runs at 82% for approximately 7−1/2 minutes. If

demand has not been satisfied after 7−1/2 minutes −

S motor runs at 100% until demand is satisfied. S Once demand is met, motor ramps down to stop.

OFF

7 1/2 MIN 82%CFM

COOLING DEMAND

100% CFM

OFF

Ramping Option C

S Motor runs at 100% until demand is satisfied.

S Once demand is met, motor runs at 100% for 60 sec-

onds. Then,

S ramps down to stop.

OFF

100% CFM

COOLING DEMAND

100% CFM

OFF

Ramping Option D

D Motor runs at 100% until demand is satisfied. D Once demand is met, motor ramps down to off.

100% CFM

COOLING DEMAND

Ramping Option D

S− Motor runs at 100% until demand is satisfied.

S− Once demand is met, motor ramps down to stop.

OFFOFF

100% CFM

COOLING DEMAND

OFFOFF

Page 29

Switches 11 and 12 − Heating Mode Blower Speed

idi

Dehumidification mode begins when rela

satisfied between

lid

Switches 11 and 12 are used to select heating mode blower motor speed. The unit is shipped from the factory with the dip switches positioned for medium low (2) speed indoor blower motor operation during the heating mode. The table below provides the heating mode blower speeds that will result from different switch settings. Refer to blower data tables at the front of this manual for corresponding cfm values.

TABLE 26

Heating Mode Blower Speeds

Speed Switch 11 Switch 12

1 − Low On On

2 − Medium Low

(Factory)

Off On

3 − Medium High On Off

4 − High Off Off

On−Board Jumper W914

On−board jumper W914, which connects terminals DS and R on the integrated control board, must be cut when the furnace is installed with either the Harmony II zone control board or the CCB1 EfficiencyPlus humidity control. Refer to table 27 for operation sequence in applications including a GHR32V, CCB1 and single−speed outdoor unit. Table 28 gives the operation sequence in applications with a two− speed outdoor unit.

On−Board Jumper W951

On−board jumper W951, which connects terminals R and O on the integrated control board, must be cut when the furnace is installed in applications which include a heat pump unit and the FM21 FuelMaster control board.

Factory−Installed Jumper Y1 to Y2

A factory−installed jumper from Y1 to Y2 terminals on the integrated control board terminal strip must be removed if two−stage cooling will be used.

Diagnostic LEDs (DS1 and DS2)

Two diagnostic LEDs are located on the two−stage, variable speed integrated control just to the left of the first bank of dip switches. These lights’ flashes correspond with diagnostic codes detailed on in table 15.

Status LEDs (HEAT, HI/LO, ON/OFF and CFM)

The integrated control includes four LEDs which indicate operating status. The green ON/OFF LED is lit any time the blower is operating. The green CFM LED indicates the blower motor speed. Count the number of blinks between the two−second pauses to determine the CFM. Each blink represents approximately 100 CFM. The yellow HI/LO LED is lit when the W914 (DS to R) jumper has not been clipped for CCB1 or Harmony operation. The yellow HEAT LED is lit when the indoor blower is operating at the HEATING speed.

Table 27

Operating Sequence

GHR32V−5, CCB1 and Single−Speed Outdoor Unit

OPERATING MODE SYSTEM DEMAND SYSTEM RESPONSE

System Condition

Normal operation Y1

*Call for humidity

removal during

cooling demand Dehumidification demand satisfied

during cooling demand.

Call for cooling after

call for hum

removal.

Humidity demand satisfied between

thermostat demands

(unit off cycle).

NOTE − When changing unit mode of operation from cooling to heating, indicating lights that are on will stay on until the first thermostat heating demand. * Reduced blower speed is 77% of COOL for V3 units and 74% of COOL for the V5 units.

Thermostat

Demand

None

None Over setpoint (1 or more) Off

Y1 Change to acceptable COOL

*Relative Humidity

(EfficiencyPlus Lights)

No demand. Humidity

level is acceptable

Humidity level rises

above setpoint. Demand

initiated.

Humidity level falls below

setpoint. No demand

Humidity level above set-

point. Demand initiated.

Humidity level above set-

point. Demand initiated.

Blower

CFM

(COOL)

COOL

77%/74% of COOL

COOL

Off

77%/74%

of COOL

Comments

Compressor demand and indoor blower speed controlled by thermostat demand.

Call for dehumidification initiated by CCB1 control. Indoor blower speed reduced by CCB1 control. When humidity demand is satisfied, blower speed immediately increases to the COOL CFM to hasten the end of the cycle.

Dehumidification mode begins when relative humidity is greater than setpoint.

While unit is not operating (no thermostat

emand), s

back up. Blower operates at COOL CFM.

e switch is moved down an

Page 30

+ 69 hidden pages

Lennox GHR32Q, GHR32V Unit Information

Specifications and Main Features

Frequently Asked Questions

User Manual