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Lennox SPBH4 Series Unit Information
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Lennox SPBH4 Series Unit Information

Lennox SPBH4 Series Unit Information

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Service Literature
The SPB*H4 is a high efficiency commercial split−system
heat pump unit, which features a two stage scroll compres-
sor and HFC−410A refrigerant. SPB*H4 units are available
in 3, 4 and 5 ton capacities. The series designed for use with
an indoor unit with an expansion valve approved for
HFC−410A. This manual is divided into sections which dis-
cuss the major components, refrigerant system, charging
procedure, maintenance and operation sequence.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause personal injury, loss of
life, or damage to property.
Installation and service must be performed by a
licensed professional installer (or equivalent) or a
service agency.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result
in personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change.
MODEL NUMBER IDENTIFICATION
S = T−Classt Product Line
P = Heat Pump Outdoor Unit
Revised 07−2010
S−CLASSt SPB*H4 Commercial Heat Pump
S P B
Brand/Family
Unit Type
Major Design Sequence
A = 1st Generation
B = 2nd Generation
Nominal Cooling Capacity − Tons
036 = 3 Tons
048 = 4 Tons
060 = 5 Tons
Cooling Efficiency
H = High Efficiency
Corp. 0629−L5

TABLE OF CONTENTS

Specifications / Electrical
VI Maintenance
VII Brazing Procedure
VIII Wiring Diagram
036 H
4 S
4
5
Y
Coil type
4 = Four−sided
Part Load Capability
S = Part load capabilities with multi−stage operation
Refrigerant Type
Page 1
SPB*H4
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Voltage
Y = 208/230V-3 phase-60hz
Minor Design Sequence
1 = 1st Revision
2 = 2nd Revision
3 = 3rd Revision
©2006 Lennox Industries Inc.
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Summary of Contents for Lennox SPBH4 Series

  • Page 1: Table Of Contents

    Revised 07−2010 Service Literature S−CLASSt SPB*H4 Commercial Heat Pump The SPB*H4 is a high efficiency commercial split−system heat pump unit, which features a two stage scroll compres- sor and HFC−410A refrigerant. SPB*H4 units are available in 3, 4 and 5 ton capacities. The series designed for use with an indoor unit with an expansion valve approved for HFC−410A.
  • Page 2 SPECIFICATIONS SPBXXXH4S41Y and SPBXXXH4S42Y General Model No. SPB036H4 SPB048H4 SPB060H4 Data Nominal Tonnage Connections Liquid line (o.d.) − in. (sweat) Vapor line (o.d.) − in. 1−1/8 1−1/8 Refrigerant HFC−410A charge furnished 12 lb. 8 oz. 15 lb. 7 oz. 13 lb. 8 oz. Outdoor Net face area −...
  • Page 3 SPECIFICATIONS SPBXXXH4S43Y and SPBXXXH4S44Y General Model No. SPB036H4 SPB048H4 SPB060H4 Data Nominal Tonnage Connections Liquid line (o.d.) − in. (sweat) Vapor line (o.d.) − in. 1−1/8 1−1/8 Refrigerant HFC−410A charge furnished 10 lb. 4 oz. 15 lb. 7 oz. 11 lb. 7 oz. Outdoor Net face area −...
  • Page 4 Warranty will be voided if covered equipment is re- This unit must be matched with an indoor coil as moved from original installation site. Warranty will specified Lennox SPB036H4 Engineering not cover damage or defect resulting from: Handbook. Coils previously charged with HCFC−22 Flood, wind, lightning, or installation and operation must be flushed.

  • Page 5: I Unit Information

    All major components (indoor blower and coil) must be is for alignment and not designed to support weight of panel. matched according to Lennox recommendations for the compressor to be covered under warranty. Refer to the En- Panel shown slightly rotated to allow top tab to exit (or enter) top slot for removing (or installing) panel.

  • Page 6: Unit Components

    The compressor is energized by a contactor located in the FILTER control box. See figure 3. Three−pole contactors are used DRIER in all SPB*H4 series units. K1 is energized through the de- frost control board by the indoor thermostat demand. HIGH PRESSURE SWITCH...
  • Page 7 High Pressure Switch (HI−PS) When the high pressure Defrost Control Board switch trips, the defrost board will cycle off the compressor, and the strike counter in the board will count one strike. Note − Component Locations Vary by Board Manufacture TEST PINS 5−Strike Lockout Feature The internal control logic of the board counts the pressure...
  • Page 8 Sensor Locations SPB036H4−0 COIL SENSOR 17 tubes up from bottom DEFROST BOARD (17−1/2") DEFROST SENSOR HARNESS SPB036H4−060 COIL SENSOR 12 tubes up from bottom (11−1/2") AMBIENT SENSOR SPB036H4−04 COIL SENSOR COIL SENSOR − 13 tubes up from DISCHARGE APPLY GREASE bottom (12−1/2") LINE SENSOR BETWEEN RETURN...
  • Page 9 Second−Stage Operation If the board receives a call for mum difference allowed by the control, a defrost cycle second−stage compressor operation Y2" in heating or will be initiated. cooling mode and the first-stage compressor output is ac- IMPORTANT The demand defrost control board will al- tive, the second-stage compressor solenoid output will be low a greater accumulation of frost and will initiate fewer de- energized.
  • Page 10 TEST JUMPER Placing the jumper on the test pins allows the technician to: Clear short cycle lockout Clear five−strike fault lockout Cycle the unit in and out of defrost mode Place the unit in defrost mode to clear the coil When Y1 is energized and 24V power is being applied to the Demand Defrost Control, a test cycle can be initiated by placing a jumper on the Demand Defrost Control’s TEST pins for 2 to 5 sec- onds.
  • Page 11 TABLE 2 Defrost Control Board Diagnostic LEDs Green Condition/Code Possible Cause(s) Solution Power problem No power (24V) to board termi- Check control transformer power (24V). nals R and C or board failure. If power is available to board and LED(s) do not light, replace board.
  • Page 12 (figure 11). One scroll remains stationary, while the The scroll compressors in all SPB*H4 model units are de- other is allowed to orbit" (figure 12). Note that the orbiting signed for use with HFC−410A refrigerant and operation at scroll does not rotate or turn but merely orbits"...
  • Page 13 HOW A SCROLL WORKS MOVEMENT OF ORBIT SUCTION SUCTION INTERMEDIATE PRESSURE CRESCENT SHAPED GAS POCKET ORBITING SCROLL SUCTION POCKET FLANKS SEALED BY STATIONARY SCROLL SUCTION CENTRIFUGAL SUCTION FORCE HIGH DISCHARGE PRESSURE POCKET FIGURE 12 TWO−STAGE MODULATION Bypass Ports Bypass Ports Closed Open High Capacity...
  • Page 14 thermometer to discharge line as close as possible to IMPORTANT the compressor. This performance check is ONLY valid on systems 4. Turn toggle switch "OFF" and install switch in series that have clean indoor and outdoor coils, proper air- with Y2 wire from room thermostat. flow over coils, and correct system refrigerant 5.
  • Page 15 In all units, the condenser fan is controlled by the compressor contactor. ELECTRICAL DATA tables in this manual show specifi- solenoid fusite compressor terminals cations for condenser fans used in SPB*H4’s. fusite meter terminals Access to the condenser fan motor on all units is gained compressor by removing the four screws securing the fan assembly.

  • Page 16: Refrigerant System

    This switch shuts off the compressor when suction pressure drops below the factory A filter drier designed for all SPB*H4 model units is factory setting. The switch is closed during normal operating pres- installed in the liquid line.
  • Page 17 SPB*H4 COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS) OUTDOOR UNIT DISTRIBUTOR COIL SENSOR REVERSING VALVE EXPANSION/CHECK VALVE BI−FLOW OUTDOOR FILTER / DRIER COIL INTERNAL COMPRESSOR HIGH INDOOR UNIT LIMIT PRESSURE PRESSURE MUFFLER GAUGE MANIFOLD SUCTION SERVICE VAPOR PORT LINE LIQUID LINE VALVE HFC−410A...
  • Page 18 TABLE 1 Service Valve (Valve Closed) Liquid Suction Unit L15 Line Sets Line Line stem cap service L15−65 −036, 3/8 in. 7/8 in. port 15 ft. − 50 ft. −048 (10 mm) (22 mm) (4.6 m − 15 m) insert hex to outdoor coil wrench here 3/8 in.

  • Page 19: Charging

    Ball Valve (Valve Open) WARNING Use Adjustable Wrench Fire, Explosion and Personal Safety To open: rotate Stem Clockwise 90°. Hazard. To close: rotate Stem Counter-clockwise 90°. Failure to follow this warning could re- stem cap sult in damage, personal injury or to outdoor coil death.
  • Page 20 der with pressure regulator set to 150 psig (1034 kPa) IMPORTANT and purge the hose. Open the manifold gauge valves to break the vacuum in the line set and indoor unit. Close the manifold gauge valves. Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns.
  • Page 21 C − Charging SSB*H4S41Y through TABLE 2 SSB*H4S43Y SPB036H4 Subcooling Values for Charging Second Stage (High-Capacity) Charge Using the Weigh-in Method Outdoor Temperature < 65ºF (18ºC) SSB*H4S41Y through SSB*H4S43Y If the system is void of refrigerant, or if the outdoor ambient _ Saturation Temperature temperature is cool, first, locate and repair any leaks and _ Liquid Line Temperature...
  • Page 22 TABLE 3 TABLE 5 Normal Operating Pressures − Heating SPB036H4 Approach Values for Charging Second Stage (High-Capacity) SSB*H4S41Y through SSB*H4S43Y SSB*H4S41Y through SSB*H4S43Y Model SPB036H4S41 SPB048H4S41 SPB060H4S41 _ Liquid Line Temperature °F (°C) Liquid Vapor Liquid Vapor Liquid Vapor _ Outdoor Temperature First Stage (Low Capacity) Pressure _ Approach Temperature 40 (4.4)
  • Page 23 Step 1. Determine the desired DT Measure entering air tempera- Temp. ture using dry bulb (A) and wet bulb (B). DT is the intersecting value 24 24 24 23 23 22 22 22 20 19 18 17 16 15 of air of A and B in the table (see triangle).
  • Page 24 Indoor Unit Matchups SSB*H4S44Y Table 8. SSB060H4S44Y Target INDOOR HEAT **Add Subcooling Table 6. − SSB024H4S44Y MATCHUP PUMP charge Heat Cool (+5ºF) (+1ºF) Target SPB036H4SPB036H4–060 INDOOR HEAT **Add Subcooling MATCHUP PUMP charge Heat Cool (+5ºF) (+1ºF) CH23–68 SPB036H4–036 CH23–65 CH23–51 CBX26UH–060 CH23–65 CB27UH−060...
  • Page 25 Table 10. HFC−410A Normal Operating Pressures − Table 12. SPB048H4S45Y Heating Heating Cooling *Add Charge Indoor Unit Match− +5ºF +1ºF SSB*H4S44Y Subcooling lbs. XP16 −024 −036 −048 −060 CBX26UH−048−230 °F (°C) CBX27UH−048−230 First Stage (Low Capacity) Pressure CBX27UH−060−230 40 (4.4) CBX32M−048 50 (10) Second Stage (High Capacity) Pressure...

  • Page 26: Service And Recovery

    Second Stage (High Capacity) Pressure Use recovery machine rated for HFC−410A refrig- erant. (−7.0) If the SPB*H4 system must be opened for any kind of ser- (−1.0) vice, such as compressor or drier replacement, you must take extra precautions to prevent moisture from entering (4.4)
  • Page 27 In order to maintain the warranty on this equipment, the ie, service valves, reversing valve, pressure switches that SPB*H4 system must be serviced annually and a record of may be damaged due to brazing heat. service maintained. The following should be checked be-...
  • Page 28 VIII − WIRING DIAGRAM AND SEQUENCE OF OPERATION Page 28...
  • Page 29 Figure 26. Unit Wiring Diagram (−036 and −048 Sizes) SPB*H4S45Y Page 29...
  • Page 30 Figure 27. Unit Wiring Diagram (−060 Size Only) SPB*H4S45Y Page 30...
  • Page 31 Sequence of Operation Cooling 3 − The defrost board sends 24 volts through Y2 OUT to the L34 compressor solenoid plug. The 2− wire com- A – First Stage Low Capacity pressor solenoid plug converts the 24volt AC outputs to Transformer from indoor unit supplies 24VAC power to a 24volt DC signal input to the L34 internal high capac- the thermostat and outdoor unit controls.