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© 2000 Lennox Industries Inc.
Litho U.S.A.
Corp. 0001−L2
GHR32Q/V
Service Literature
Revised 08−2004
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 cool-
ing. 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 vari-
able speed control) integrated control board. Each
GHR32 unit meets the California Nitrogen Oxides (NO
x
)
Standards and California Seasonal Efficiency require-
ments. 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.
GHR32Q MODEL SHOWN
DOWN FLOW
POSITION
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . .
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