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Lennox HP29 Series Manual

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Service Literature
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.
Introduction
. . . . . . . . . . . . . . . . . . . .
Specifications / Electrical
. . . . . . . . . . . . . .
Control Box
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. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
Corp. 0101−L1
Revised 06−2003
HP29 HEAT PUMP SERIES

TABLE of CONTENTS

Page 1
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Page 2
Page 4
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Page 6
Page 6
Page 7
Page 9
Page 13
Page 14
Page 1
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.
IV CHARGING
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
Evacuating
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
V MAINTENANCE
. . . . . . . . . . . . . .
VI WIRING & OPERATION SEQUENCE
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
HP29
Heat Pumps−7.5 &10 Ton
(26.4 & 35.2 kw)
Litho U.S.A.
HP29−090
Page 15
Page 15
Page 16
Page 17
Page 19
Page 20
. . . . . . . . .
 2001 Lennox Industries Inc.
Litho U.S.A.

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Summary of Contents for Lennox HP29 Series

  • Page 1: Table Of Contents

    ....Page 14 Thermostat Connections ..Page 26 Page 1  2001 Lennox Industries Inc. Litho U.S.A.
  • Page 2 SPECIFICATIONS Model No. HP29−090−2 HP29−120−2 Nominal Size − Tons (kW) 7.5 (26.4) 10 (35.2) Liquid line (o.d.) in. (mm) connection (sweat) 5/8 (15.9) Vapor line (o.d.) in. (mm) connection (sweat) 1−3/8 (34.9) Outer coil 21.80 (2.03) (2) 29.34 (2.73) Net face area Net face area sq.
  • Page 3 ELECTRICAL DATA Model No. HP29−090−2 HP29−120−2 Line voltage data 60 hz − 3 phase 208/230v 460v 575v 208/230v 460v 575v Rec. max. fuse or circuit breaker size (amps) {Minimum circuit ampacity Rated load amps 28.8 14.7 10.8 37.8 17.2 12.4 Compressor (1) Locked rotor amps Full load amps (total)

  • Page 4: Parts Arrangement

    HP29−090−3 MODEL PARTS ARRANGEMENT fan guard control box outdoor fan (B4) vapor line service valve reversing valve defrost thermostat (S6) discharge line thermostat (S5) high pressure switch (S4) compressor defrost pressure (B1) switch (S46) loss of charge switch (S24) liquid line service valve low ambient switch (S11)
  • Page 5 HP29−090−3 CONTROL BOX transfer relay low ambient outdoor fan kit relay relay K10 defrost relay CMCI defrost/timer latch relay ground capacitor C1 terminal strip TB 14 compressor contactor FIGURE 3 HP29−120−3 CONTROL BOX relay switch terminal strip TB 14 cmc1 defrost / timer outdoor fan transfer relay relay K10...

  • Page 6: I Unit Components

    I−UNIT COMPONENTS A latch relay (figure 5 ) has two coils: a SET" coil and a The HP29−090 and HP29−120 components are shown in RESET" coil. When 24VAC is applied to the SET" coil, the figures 1 and 2. normally open contacts close and the normally closed con A−CONTROL BOX COMPONENTS tacts open.

  • Page 7: Cooling

    K6 and transfer relay K8 al ALL major components (indoor blower/coil) must be matched to Lennox recommendations for com lows the HP29 unit to use a conventional heat/cool thermo pressor to be covered under warranty. Refer to En stat instead of a heat pump thermostat.
  • Page 8 SUCTION SUCTION INTERMEDIATE PRESSURE CRECENT SHAPED ORBITING SCROLL GAS POCKET STATIONARY SCROLL SUCTION FLANKS SEALED POCKET BY CENTRIFIGUAL FORCE SUCTION SUCTION MOVEMENT OF ORBIT DISCHARGE HIGH PRESURE GAS POCKET FIGURE 8 The counterclockwise orbiting scroll draws gas into the 2 − Crankcase Heaters HR1 (all units) outer crescent shaped gas pocket created by the two All HP29 units use a belly−band crankcase heater.

  • Page 9: Defrost System

    5 − Discharge Line Thermostat S5 C−Defrost System S5 is an automatic reset SPST N.C. switch which opens on a temperature rise. The switch is located on the discharge ELECTROSTATIC DISCHARGE (ESD) line and wired in series with the CMCI board and S4 pres Precautions and Procedures sure switch.
  • Page 10 Defrost Control CMC1 During one demand cycle, the defrost control will lock out the unit on the third instance that the unit goes off on any The defrost control board combines functions of a time / auto−reset pressure switch wired to this circuit. The diag temperature initiated and time / pressure terminated defrost nostic LEDs will display a pattern for a locked out pressure control, defrost relay, time delay, diagnostic LEDs and field...
  • Page 11 DEFROST CONTROL BOARD HP29−2 UNITS COMPRESSOR CONNECTIONS DIAGNOSTIC LEDs DEFROST INTERVAL TIMING PINS PRESSURE SWITCH SAFETY CIRCUIT CONNECTIONS AMBIENT THERMISTOR 24V TERMINAL CONNECTION STRIP CONNECTIONS SERVICE LIGHT DEFROST SWITCH CONNECTION CONNECTIONS REVERSING VALVE NOTE− There is an internal jumper between inside PS1 and PS2 terminals. FIGURE 10 DEFROST CONTROL BOARD HP29−3 UNITS service...
  • Page 12 COOLING MODE HIGH REVERSING PRESSURE PRESSURE VALVE COMPRESSOR NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW ACCUMULATOR EXPANSION CHECK VALVE VALVE VAPOR LINE SERVICE LIQUID LINE BI−FLOW VALVE SERVICE DRIER VALVE EXPANSION OUTDOOR UNIT INDOOR UNIT VALVE FIGURE 12 HEATING MODE HIGH REVERSING PRESSURE...

  • Page 13: Ii Refrigerant

    (sweat connections) to the indoor INDOOR COIL) evaporator coil (sweat connections). Refer to table 2 for field−fabricated refrigerant line sizes. Refer to Lennox Re frigerant Piping manual Corp. #9351−L9 for proper size, VALVE type and application of field−fabricated lines. Separate dis...

  • Page 14: Startup

    DANGER VAPOR LINE SERVICE VALVE USE ADJUSTABLE WRENCH Do not attempt to backseat this valve past the ROTATE STEM CLOCKWISE 90_ TO CLOSE retaining ring. Attempts to backseat this valve past ROTATE STEM COUNTER CLOCKWISE 90_ TO OPEN the retaining ring will cause snap ring to explode from valve body under pressure of refrigerant.

  • Page 15: Leak Testing

    3 for refrigerant charge adjustment for the valve on the high side of the manifold gauge set which HP29 series units. Units are designed for line sets up to 50 ft. will pressurize the system. (15.24 m). Consult Lennox Refrigerant Piping Manual for line 6 −...

  • Page 16: Hp29 090 2

    TABLE 3 UNIT MODEL MATCHED HCFC 22 FOR 25 FEET LIQUID LINE ADJUSTMENT PER NUMBER INDOOR UNIT DIAMETER FOOT (.3 m) OF LINE* (7.6 m) OF LINE 5/8 in. (16 mm) 1.8 oz.. (51g) HP29−090−2 HP29 090 2 23 lbs. (10.4 kg) 23 lbs.
  • Page 17 C−Charging 5 − Compare the normal operating pressures to the pres sures obtained from the gauges. Minor variations in If the system is completely void of refrigerant, the recom these pressures may be expected due to differences mended and most accurate method of charging is to weigh in installations.
  • Page 18 TABLE 5 Normal Operating Pressures Outdoor Coil HP29−090−2* HP29−090−2* HP29−120−2** HP29−120−2** Entering Air Discharge Vapor Discharge Vapor Temperature + 10 psig + 5 psig + 10 psig + 5 psig 65_F (18_C) 75_F (24_C) 85_F (29_C) 95_F (35_C) 105_F (41_C) 115_F (46_C) * HP29−090 tested with CB17/CBH17−95V.
  • Page 19 V−MAINTENANCE Check amp−draw of the compressor. Unit nameplate _________ Actual ____________ . At the beginning of each cooling season, the system NOTE − If the owner complains of insufficient cooling, should be checked as follows: gauge the unit and check the refrigerant charge. Re fer to section on refrigerant charging in this instruc WARNING tion.
  • Page 20 VI−Wiring Diagram and Sequence of Operation A−HP29−090−2 Y, G, J, M Page 20...
  • Page 21 B−HP29−090−3 Y, G, J, M Page 21...
  • Page 22 SEQUENCE OF OPERATION HP29−090 After each thermostat demand, time delay locks HEATING out the circuit to compressor contactor coil and 1 − Heating demand energizes through terminal W1 at the defrost control for 5 + 2 minutes. At the end of the indoor thermostat provided 5−minute time delay is sat time period, the time delay allows the compressor isfied.
  • Page 23 C−HP29−120−2 Y, G, J, M Page 23...
  • Page 24 D−HP29−120−3 Y, G, J, M Page 24...
  • Page 25 SEQUENCE OF OPERATION HP29−120 After each thermostat demand, time delay locks 3 − N.O. K6−1 latching relay contacts open, de−energizing out the circuit to compressor contactor coil and L1 reversing valve. defrost control for 5 + 2 minutes. At the end of the 4 −...

  • Page 26: Thermostat Connections

    E− THERMOSTAT CONNECTIONS Page 26...
  • Page 27 SERVICE NOTES Page 27...

This manual is also suitable for:

Hp29-090--2Hp29-120-2Hp29-090-3Hp29-120-3

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