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2001 Lennox Industries Inc.
Litho U.S.A.
Corp. 0101−L1
HP29
Service Literature
Litho U.S.A.
Heat Pumps−7.5 &10 Ton
(26.4 & 35.2 kw)
Revised 06−2003
HP29 HEAT PUMP SERIES
The HP29 7.5 and 10 (26.4 and 35.2 kW) ton heat pump
units are designated for light commercial applications, with
a remotely located blower−coil unit or a furnace with an
add−on evaporator coil. HP29 model units are equipped
with a scroll compressor. The HP29 heat pumps match
with the CB/CBH17 blower−coil units. All HP29 units are
three−phase.
This manual is divided into sections which discuss the ma
jor components, refrigerant system, charging procedure,
maintenance and operation sequence.
Information in this manual is intended for qualified service
technicians only. All specifications are subject to change.
Procedures in this manual are presented as recommenda
tions only and do not supersede or replace local or state
codes.
WARNING
Refrigerant can be harmful if it is inhaled. Refriger
ant must be used and recovered responsibly.
Failure to follow this warning may result in person
al injury or death.
HP29−090
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a qualified installer or service
agency.
TABLE of CONTENTS
Introduction Page 1. . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Page 2. . . . . . . .
Parts Arrangement Page 4. . . . . . . . . . . . . .
I UNIT COMPONENTS Page 6. . . . . . . . . .
Control Box Page 6. . . . . . . . . . . . . . . . . . . .
Cooling Page 7. . . . . . . . . . . . . . . . . . . . . . . .
Defrost System Page 9. . . . . . . . . . . . . . . . .
II REFRIGERANT Page 13. . . . . . . . . . . . . . .
III START UP Page 14. . . . . . . . . . . . . . . . . . .
IV CHARGING Page 15. . . . . . . . . . . . . . . . .
Leak Testing Page 15. . . . . . . . . . . . . . . . . . .
Evacuating Page 16. . . . . . . . . . . . . . . . . . . . .
Charging Page 17. . . . . . . . . . . . . . . . . . . . . .
V MAINTENANCE Page 19. . . . . . . . . . . . . .
VI WIRING & OPERATION SEQUENCE
HP29−090 Page 20. . . . . . . . . . . . . . . . . . . . . .
HP29−120 .Page 23. . . . . . . . . . . . . . . . . . . . . .
Thermostat Connections .Page 26. . . . . . . . .
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