Lennox SPBH4 Unit Information

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Page 1

Corp. 0629−L5

Revised 07−2010

SPB*H4

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 compressor 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 discuss 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.

TABLE OF CONTENTS

Specifications / Electrical Page 2. . . . . . . . . . . . .

I Unit Information Page 5. . . . . . . . . . . . . . . . . . . .

II Unit Components Page 6. . . . . . . . . . . . . . . . . .

III Refrigerant System Page 16. . . . . . . . . . . . . . . .

IV Charging Page 19. . . . . . . . . . . . . . . . . . . . . . . .

V Service and Recovery Page 26. . . . . . . . . . . . .

VI Maintenance Page 27. . . . . . . . . . . . . . . . . . . . .

VII Brazing Procedure Page 27. . . . . . . . . . . . . . .

VIII Wiring Diagram Page 28. . . . . . . . . . . . . . . . . .

MODEL NUMBER IDENTIFICATION

SPB Y5036 H 44 S

Major Design Sequence

A = 1st Generation

B = 2nd Generation

Brand/Family

S = T−Class Product Line

Unit Type

P = Heat Pump Outdoor Unit

Nominal Cooling Capacity − Tons

036 = 3 Tons 048 = 4 Tons 060 = 5 Tons

Cooling Efficiency

H = High Efficiency

Minor Design Sequence

1 = 1st Revision 2 = 2nd Revision 3 = 3rd Revision

Vol ta ge

Y = 208/230V-3 phase-60hz

Refrigerant Type

4 = HFC−410A

Part Load Capability

S = Part load capabilities with multi−stage operation

Coil type

4 = Four−sided

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SPECIFICATIONS  SPBXXXH4S41Y and SPBXXXH4S42Y

General Data

Model No. SPB036H4

SPB048H4 SPB060H4

Nominal Tonnage 3 4 5

Connections (sweat)

Liquid line (o.d.) − in. 3/8 3/8 3/8

Vapor line (o.d.) − in. 7/8 1−1/8 1−1/8

Refrigerant

HFC−410A charge furnished 12 lb. 8 oz. 15 lb. 7 oz. 13 lb. 8 oz.

Outdoor Coil

Net face area − sq. ft. Outer coil 18.67 24.5 24.93

Inner coil 18.00 23.64 24.14

Tube diameter − in. 5/16 5/16 5/16

No. of rows 2 2 2

Fins per inch 22 22 22

Outdoor Fan

Diameter − in. 22 22 26

No. of blades 4 4 3

Motor hp 1/6 1/4 1/3

Cfm 3150 3980 4380

Rpm 844 836 850

Watts 215 305 280

Shipping Data − lbs. 1 pkg. 252 294 331

ELECTRICAL DATA

Line voltage data − 60hz 208/230V−3ph 208/230V−3ph 208/230V−3ph

Maximum overcurrent protection (amps) 25 30 40

Minimum circuit ampacity 15.04 18.53 23.83

Compressor

Rated load amps 11.15 13.46 17.62

Locked rotor amps 58 88 135

Power factor 0.99 0.99 0.99

Outdoor Coil Fan Motor

Full load amps 1.1 1.7 1.8

Locked rotor amps 2.1 3.1 2.9

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SPECIFICATIONS  SPBXXXH4S43Y and SPBXXXH4S44Y

General Data

Model No. SPB036H4

SPB048H4 SPB060H4

Nominal Tonnage 3 4 5

Connections (sweat)

Liquid line (o.d.) − in. 3/8 3/8 3/8

Vapor line (o.d.) − in. 7/8 1−1/8 1−1/8

Refrigerant

HFC−410A charge furnished 10 lb. 4 oz. 15 lb. 7 oz. 11 lb. 7 oz.

Outdoor Coil

Net face area − sq. ft. Outer coil 18.67 24.5 24.93

Inner coil 18.00 23.64 24.14

Tube diameter − in. 5/16 5/16 5/16

No. of rows 2 2 2

Fins per inch 22 22 22

Outdoor Fan

Diameter − in. 22 22 26

No. of blades 4 4 3

Motor hp 1/6 1/4 1/3

Cfm 3150 3980 4380

Rpm 844 836 850

Watts 215 305 280

Shipping Data − lbs. 1 pkg. 252 294 331

ELECTRICAL DATA

Line voltage data − 60hz 208/230V−3ph 208/230V−3ph 208/230V−3ph

Maximum overcurrent protection (amps) 25 30 40

Minimum circuit ampacity 15.04 18.53 23.83

Compressor

Rated load amps 11.15 13.46 17.62

Locked rotor amps 58 88 135

Power factor 0.99 0.99 0.99

Outdoor Coil Fan Motor

Full load amps 1.1 1.7 1.8

Locked rotor amps 2.1 3.1 2.9

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SPECIFICATIONS  SPBXXXH4S45Y

General Data

Model No. SPB036H4

SPB048H4 SPB060H4

Nominal Tonnage 3 4 5

Connections (sweat)

Liquid line (o.d.) − in. 3/8 3/8 3/8

Vapor line (o.d.) − in. 7/8 1−1/8 1−1/8

Refrigerant

HFC−410A charge furnished 10 lb. 9 oz. 11 lb. 12 oz. 12 lb. 15 oz.

Outdoor Coil

Net face area − sq. ft. Outer coil 21.0 22.17 29.09

Inner coil 20.27 21.51 28.16

Tube diameter − in. 5/16 5/16 5/16

No. of rows 2 2 2

Fins per inch 22 22 22

Outdoor Fan

Diameter − in. 22 26 26

No. of blades 4 3 3

Motor hp 1/4 1/3 1/3

Cfm 3900 4100 4350

Rpm 830 855 820

Watts 2195 265 195

Shipping Data − lbs. 1 pkg. 273 294 353

ELECTRICAL DATA

Line voltage data − 60hz 208/230V−3ph 208/230V−3ph 208/230V−3ph

Maximum overcurrent protection (amps) 25 30 40

Minimum circuit ampacity 15.6 18.6 24.8

Compressor

Rated load amps 11.15 13.46 17.62

Locked rotor amps 58 88 135

Power factor 0.99 0.99 0.99

Outdoor Coil Fan Motor

Full load amps 1.7 1.8 2.8

WARNING

Warranty will be voided if covered equipment is removed from original installation site. Warranty will not cover damage or defect resulting from: Flood, wind, lightning, or installation and operation in a corrosive atmosphere (chlorine, fluorine, salt, recycled waste water, urine, fertilizers, or other damaging chemicals).

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HFCs, and HCFCs) as of July 1,

1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for non−compliance.

IMPORTANT

This unit must be matched with an indoor coil as specified in Lennox SPB036H4 Engineering Handbook. Coils previously charged with HCFC−22 must be flushed.

CAUTION

Electrostatic discharge can affect electronic components. Take precautions during unit installation and service to protect the unit’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the unit, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface before performing any service procedure.

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I − UNIT INFORMATION

All major components (indoor blower and coil) must be matched according to Lennox recommendations for the compressor to be covered under warranty. Refer to the Engineering Handbook for approved system matchups. A misapplied system will cause erratic operation and can result in early compressor failure.

CAUTION

To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:

While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).

While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown around and battered.

Remove the louvered panels as follows:

1. Remove 2 screws, allowing the panel to swing open slightly (see figure 1).

2. Hold the panel firmly throughout this procedure. Rotate bottom corner of panel away from hinge corner post until lower 3 tabs clear the slots (see figure 1, Detail B).

3. Move panel down until lip of upper tab clears the top slot in corner post (see figure 1, Detail A).

Position and Install Panel  Position the panel almost parallel with the unit (figure 1, Detail D) with the screw side" as close to the unit as possible. Then, in a continuous motion:

 Slightly rotate and guide the lip of top tab inward (figure

1, Details A and C); then upward into the top slot of the hinge corner post.

 Rotate panel to vertical to fully engage all tabs.

 Holding the panel’s hinged side firmly in place, close

the right−hand side of the panel, aligning the screw holes.

When panel is correctly positioned and aligned, insert the screws and tighten.

Detail

Detail C

Detail

FIGURE 1

Removing/Installing Louvered Panels

MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT AS POSSIBLE) WHILE INSTALLING PANEL.

PREFERRED ANGLE FOR INSTALLATION

Detail D

ROTATE IN THIS DIRECTION; THEN DOWN TO REMOVE PANEL

SCREW HOLES

ANGLE MAY BE TOO EXTREME

HOLD DOOR FIRMLY TO THE HINGED

SIDE TO MAINTAIN

FULLY−ENGAGED TABS

LIP

IMPORTANT! Do not allow panels to hang on unit by top tab. Tab is for alignment and not designed to support weight of panel.

Panel shown slightly rotated to allow top tab to exit (or enter) top slot for removing (or installing) panel.

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II − UNIT COMPONENTS

Unit components are illustrated in figure 2.

SPB*H4 UNIT COMPONENTS

FIGURE 2

OUTDOOR FAN

COMPRESSOR

HIGH PRESSURE

SWITCH

REVERSING

VALV E

FILTER

DRIER

CONTROL

BOX

EXPANSION

VALV E

VAPOR LINE

SERVICE

VALV E

LIQUID LINE

SERVICE

VALV E

LOW PRESSURE

SWITCH

A − Control Box (Figure 3)

SPB*H4 units are not equipped with a 24V transformer. All 24 VAC controls are powered by the indoor unit. Refer to wiring diagram.

FIGURE 3

DUAL CAPACITOR

(C12)

COMPRESSOR

CONTACTOR

(K1)

UNIT CONTROL BOX

GROUNDING

LUG

DEFROST

CONTROL

(A108)

Electrical openings are provided under the control box cover. Field thermostat wiring is made to a 24V terminal strip located on the defrost control board located in the control box. See figure 4.

FIGURE 4

CRW1OY1L

24V THERMOSTAT TERMINAL STRIP

1 − Compressor Contactor K1

The compressor is energized by a contactor located in the control box. See figure 3. Three−pole contactors are used in all SPB*H4 series units. K1 is energized through the defrost control board by the indoor thermostat demand.

DANGER

Electric Shock Hazard. May cause injury or death.

Disconnect all remote electrical power supplies before opening unit panel. Unit may have multiple power supplies.

2 − Dual Capacitor C12

The compressor and fan in SPB*H4 series units use permanent split capacitor motors. The capacitor is located inside the unit control box (see figure 3). A single dual" capacitor (C12) is used for both the fan motor and the compressor (see unit wiring diagram). The fan side and the compressor side of the capacitor have different MFD ratings. See side of capacitor for ratings.

3 − Defrost Control

The demand defrost controller measures differential temperatures to detect when the system is performing poorly because of ice build−up on the outdoor coil. The controller self−calibrates" when the defrost system starts and after each system defrost cycle. The defrost control board components are shown in figure 5.

The control monitors ambient temperature, outdoor coil temperature, and total run time to determine when a defrost cycle is required. The coil temperature probe is designed with a spring clip to allow mounting to the outside coil tubing. The location of the coil sensor is important for proper defrost operation.

NOTE  The demand defrost board accurately measures the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running time between defrost cycles as more frost accumulates on the outdoor coil before the board initiates defrost cycles.

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Defrost Control Board

24V TERMINAL STRIP CONNECTIONS

DIAGNOSTIC LEDS

PRESSURE

SWITCH

CIRCUIT

CONNECTIONS

TEST PINS

Note − Component Locations Vary by Board Manufacturer.

SENSOR PLUG IN

(COIL, AMBIENT,

AND DISCHARGE

SENSORS)

FIGURE 5

REVERSING

VALV E

DELAY

PINS

LOW AMBIENT THERMOSTAT PINS

DEFROST

TERMINATION

PIN SETTINGS

Diagnostic LEDs

The state (Off, On, Flashing) of two LEDs on the defrost board (DS1 [Red] and DS2 [Green]) indicate diagnostics conditions that are described in table 2.

Defrost Board Pressure Switch Connections

The unit’s automatic reset pressure switches (LO PS − S87 and HI PS − S4) are factory−wired into the defrost board on the LO−PS and HI−PS terminals, respectively.

Low Pressure Switch (LO−PS)  When the low pressure switch trips, the defrost board will cycle off the compressor, and the strike counter in the board will count one strike. The low pressure switch is ignored under the following conditions:

 during the defrost cycle and 90 seconds after the ter-

mination of defrost

 when the average ambient sensor temperature is be-

low 15° F (−9°C)

 for 90 seconds following the start up of the compressor

 during "test" mode

High Pressure Switch (HI−PS)When the high pressure switch trips, the defrost board will cycle off the compressor, and the strike counter in the board will count one strike.

5−Strike Lockout Feature

The internal control logic of the board counts the pressure switch trips only while the Y1 (Input) line is active. If a pressure switch opens and closes four times during a Y1 (Input), the control logic will reset the pressure switch trip counter to zero at the end of the Y1 (Input). If the pressure switch opens for a fifth time during the current Y1 (Input), the control will enter a lockout condition.

The 5−strike pressure switch lockout condition can be reset by cycling OFF the 24−volt power to the control board or by shorting the TEST pins between 1 and 2 seconds. All timer functions (run times) will also be reset.

If a pressure switch opens while the Y1 Out line is engaged, a 5−minute short cycle will occur after the switch closes.

Defrost System Sensors

Sensors connect to the defrost board through a field-replaceable harness assembly that plugs into the board. Through the sensors, the board detects outdoor ambient, coil, and discharge temperature fault conditions. As the detected temperature changes, the resistance across the sensor changes. Sensor resistance values can be checked by ohming across pins shown in table 1. The graph in figure 6 shows sensor temperature to resistance range.

NOTE − When checking the ohms across a sensor, be aware that a sensor showing a resistance value that is not within the range shown in table 1, may be performing as designed. However, if a shorted or open circuit is detected, then the sensor may be faulty and the sensor harness will need to be replaced.

TABLE 1

Sensor Temperature / Resistance Range

Sensor

Temperature Range °F (°C)

Resistance values range (ohms)

Pins/Wire Color

Outdoor −35 (−37) to 120

(48)

280,000 to 3750 3 and 4

(Black)

Coil −35 (−37) to 120

(48)

280,000 to 3750 5 and 6

(Brown)

Discharge (if applicable)

24 (−4) to 350 (176)

41,000 to 103 1 and 2

(Yellow)

Note: Sensor resistance increases as sensed temperature decreases.

FIGURE 6

Ambient and Coil Sensor

RESISTANCE (OHMS)

TEMPERATURE (ºF)

5750

7450

9275

11775

15425

19975

26200

34375

46275

62700

100

10000 30000 50000 70000 90000

85300

Discharge Sensor

RESISTANCE (OHMS)

TEMPERATURE (ºF)

200

325

250

425

600

825

1175

1700

2500

3750

5825

300

280

260

240

220

200

180

160

140

120

100

1000 2000 50004000 60003000

4650

3000

2025

1400

1000

700

225

275

375

500

Page 8

FIGURE 7

CLIP COIL TEMPERATURE SENSOR FROM THE DEFROST BOARD ON THE RETURN BEND SHOWN.

COIL SENSOR − APPLY GREASE BETWEEN RETURN BEND AND SENSOR

SPB036H4−0 36

COIL SENSOR 17 tubes up from bottom (17−1/2")

SPB036H4−04 8

COIL SENSOR 13 tubes up from bottom (12−1/2")

SPB036H4−060

COIL SENSOR 12 tubes up from bottom (11−1/2")

Sensor Locations

AMBIENT SENSOR

DISCHARGE LINE SENSOR

DEFROST BOARD

DEFROST SENSOR HARNESS

Ambient Sensor  The ambient sensor (shown in detail A, figure 7) considers outdoor temperatures below −35°F (−37°C) or above 120°F (48°C) as a problem. If the ambient sensor is detected as being open, shorted or out of the temperature range of the sensor, the board will not perform demand defrost operation. The board will revert to time/temperature defrost operation and will display the appropriate fault code. Heating and cooling operation will be allowed in this fault condition.

Coil Sensor  The coil temperature sensor (shown in detail B, figure 7) considers outdoor temperatures below

−35°F (−37°C) or above 120°F (48°C) as a problem. If the coil temperature sensor is detected as being open, shorted or out of the temperature range of the sensor, the board will not perform demand or time/temperature defrost operation and will display the appropriate fault code. Heating and cooling operation will be allowed in this fault condition.

Discharge Line Sensor  If the discharge line temperature (shown in figure 7) exceeds a temperature of 300°F (148°C) during compressor operation, the board will de−energize the compressor contactor output (and the defrost output, if active). The compressor will remain off until the discharge temperature has dropped below 225°F (107°C) and the 5-minute anti−short cycle delay has been satisfied. This sensor has two fault and lockout codes:

4. If the board recognizes five high discharge line temperature faults during a single (Y1) compressor demand, it reverts to a lockout mode and displays the appropriate code. This code detects shorted sensor or high discharge temperatures. (Code on board is Discharge Line Temperature Fault and Lockout").

5. If the board recognizes five temperature sensor range faults during a single (Y1) compressor demand, it reverts to a lockout mode and displays the appropriate code. The board detects open sensor or out-of-temperature sensor range. This fault is detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance is not within range after 90 seconds, the board will count one fault. After 5 faults, the board will lockout. (Code on board is Discharge Sensor Fault and Lockout").

The discharge line sensor, which covers a range of 150°F (65°C) to 350°F (176°C), is designed to mount on a ½" re- frigerant discharge line.

NOTE  Within a single room thermostat demand, if 5−strikes occur, the board will lockout the unit. Defrost board 24 volt power R" must be cycled OFF" or the TEST" pins on board must be shorted between 1 to 2 seconds to reset the board.

Page 9

Second−Stage Operation  If the board receives a call for second−stage compressor operation Y2" in heating or cooling mode and the first-stage compressor output is active, the second-stage compressor solenoid output will be energized.

If first-stage compressor output is active in heating mode and the outdoor ambient temperature is below the selected compressor lock−in temperature, the second-stage compressor solenoid output will be energized without the Y2" room thermostat input. If the jumper is not connected to one of the temperature selection pins on P3 (40, 45, 50, 55°F), the default lock−in temperature of 40°F (4.5°C) will be used.

The board de−energizes the second-stage compressor solenoid output immediately when the Y2" signal is removed or the outdoor ambient temperature is 5°F above the selected compressor lock−in temperature, or the first-stage compressor output is de−energized for any reason.

Defrost Temperature Termination Shunt (Jumper) Pins

 The defrost board selections are: 50, 70, 90, and 100°F (10, 21, 32 and 38°C). The shunt termination pin is factory set at 50°F (10°C). If the temperature shunt is not installed, the default termination temperature is 90°F (32°C).

Delay Mode

The defrost board has a field−selectable function to reduce occasional sounds that may occur while the unit is cycling in and out of the defrost mode. When a jumper is installed on the DELAY pins, the compressor will be cycled off for 30 seconds going in and out of the defrost mode. Units are shipped with jumper installed on DELAY pins.

NOTE − The 30 second off cycle is NOT functional when the TEST pins are jumpered.

Operational Description

The defrost control board has three basic operational modes: normal, calibration, and defrost.

Normal Mode  The demand defrost board monitors the O line, to determine the system operating mode (heat/cool), outdoor ambient temperature, coil temperature (outdoor coil) and compressor run time to determine when a defrost cycle is required.

Calibration Mode  The board is considered uncalibrated when power is applied to the board, after cool mode operation, or if the coil temperature exceeds the termination temperature when it is in heat mode.

Calibration of the board occurs after a defrost cycle to ensure that there is no ice on the coil. During calibration, the temperature of both the coil and the ambient sensor are measured to establish the temperature differential which is required to allow a defrost cycle.

Defrost Mode  The following paragraphs provide a detailed description of the defrost system operation.

Detailed Defrost System Operation

Defrost Cycles  The demand defrost control board initi-

ates a defrost cycle based on either frost detection or time.

 Frost Detection  If the compressor runs longer than

34 minutes and the actual difference between the clear coil and frosted coil temperatures exceeds the maxi-

mum difference allowed by the control, a defrost cycle will be initiated.

IMPORTANT  The demand defrost control board will allow a greater accumulation of frost and will initiate fewer defrost cycles than a time/temperature defrost system.

 Time  If 6 hours of heating mode compressor run

time has elapsed since the last defrost cycle while the coil temperature remains below 35°F (2°C), the demand defrost control will initiate a defrost cycle.

Actuation  When the reversing valve is de−energized, the Y1 circuit is energized, and the coil temperature is below 35°F (2°C), the board logs the compressor run time. If the board is not calibrated, a defrost cycle will be initiated after 34 minutes of heating mode compressor run time. The control will attempt to self−calibrate after this (and all other) defrost cycle(s).

Calibration success depends on stable system temperatures during the 20−minute calibration period. If the board fails to calibrate, another defrost cycle will be initiated after 45 minutes (90 minutes −1 to −4 boards) of heating mode compressor run time. Once the defrost board is calibrated, it initiates a demand defrost cycle when the difference between the clear coil and frosted coil temperatures exceeds the maximum difference allowed by the control OR after 6 hours of heating mode compressor run time has been logged since the last defrost cycle.

NOTE  If ambient or coil fault is detected, the board will not execute the TEST" mode.

Termination  The defrost cycle ends when the coil temperature exceeds the termination temperature or after 14 minutes of defrost operation. If the defrost is terminated by the 14−minute timer, another defrost cycle will be initiated after 34 minutes of run time.

Test Mode  When Y1 is energized and 24V power is being applied to the board, a test cycle can be initiated by placing the termination temperature jumper across the Test" pins for 2 to 5 seconds. If the jumper remains across the Test" pins longer than 5 seconds, the control will ignore the test pins and revert to normal operation. The jumper will initiate one cycle per test.

Enter the TEST" mode by placing a shunt (jumper) across the TEST" pins on the board after power−up. (The TEST" pins are ignored and the test function is locked out if the shunt is applied on the TEST" pins before power−up). Board timings are reduced, the low−pressure switch and loss of charge detection fault is ignored and the board will clear any active lockout condition.

Each test pin shorting will result in one test event. For each TEST" the shunt (jumper) must be removed for at least 1 second and reapplied. Refer to flow chart (figure 8) for TEST" operation.

NOTE  The Y1 input must be active (ON) and the O" room thermostat terminal into board must be inactive.

Defrost Board Diagnostics

See table 2 to determine defrost board operational conditions and to diagnose cause and solution to problems.

Page 10

TEST

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 seconds. If the jumper remains on the TEST pins for longer than five seconds, the Demand Defrost Control will ignore the jumpered TEST pins and revert to normal operation.

The control will initiate one test event each time a jumper is placed on the TEST pins. For each TEST the jumper must be removed for at least one second and then reapplied.

DEMAND DEFROST CONTROL (UPPER LEFT−HAND CORNER)

JUMPER

NOTE  Placing a jumper on the TEST pins will not bring the unit out of inactive mode. The only way manually activate the heat pump from an inactive mode is to cycle the 24VAC power to the Demand Defrost Control.

Y1 Active

Place a jumper on TEST pins for

longer than one second but less than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable. No other functions will be executed and unit will continue in the mode it was operating.

Place a jumper on TEST pins for

more than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable.

If in HEATING Mode

If in DEFROST Mode

No further test mode operation will be executed until the jumper is removed from the TEST pins and reapplied.

If no ambient or coil sensor fault exist, unit will go into DEFROST MODE. If ambient or coil faults exist (open or shorted), unit will remain in HEAT MODE.

The unit will terminate defrost and enter HEAT MODE uncalibrated with defrost timer set for 30 minute test.

If jumper on TEST pins remains in place for more than five seconds.

The unit will return to HEAT MODE un−calibrated with defrost timer set for 30 minutes.

If jumper on TEST pins is removed before a maximum of five seconds.

The unit will remain in DEFROST MODE until termination on time or temperature.

O Line Status

INACTIVE

ACTIVE

If in COOLING Mode

FIGURE 8

Page 11

TABLE 2

Defrost Control Board Diagnostic LEDs

DS2 Green

DS1 Red

Condition/Code Possible Cause(s) Solution

OFF OFF Power problem No power (24V) to board termi-

nals R and C or board failure.

Check control transformer power (24V).

If power is available to board and LED(s) do not light, replace board.

Simultaneous SLOW Flash

Normal operation Unit operating normally or in

standby mode.

None required.

Alternating SLOW Flash

5−minute anti−short cycle delay

Initial power up, safety trip, end of room thermostat demand.

None required (Jumper TEST pins to override)

Simultaneous FAST Flash

Ambient Sensor Problem Sensor being detected open or shorted or out of temperature range. Board will re-

vert to time/temperature defrost operation. (System will still heat or cool).

Alternating FAST Flash

Coil Sensor Problem Sensor being detected open or shorted or out of temperature range. Board will not

perform demand or time/temperature defrost operation. (System will still heat or cool).

ON ON Circuit Board Failure Indicates that board has internal component failure. Cycle 24 volt power to board. If

code does not clear, replace board.

FAULT and LOCKOUT CODES (Each fault adds 1 strike to that code’s counter; 5 strikes per code = LOCKOUT)

OFF SLOW

Flash

Low Pressure Fault

Restricted air flow over indoor or outdoor coil.

Improper refrigerant charge in system.

Improper metering device installed or incorrect operation of metering device.

Incorrect or improper sensor location or connection to system.

Remove any blockages or restrictions from coils and/or fans. Check indoor and outdoor fan motor for proper current draws.

Check system charge using approach and subcooling temperatures.

Check system operating pressures and compare to unit charging charts.

Make sure all pressure switches and sensors have secure connections to system to prevent refrigerant leaks or errors in pressure and temperature measurements.

OFF ON Low Pressure LOCKOUT

SLOW Flash

OFF High Pressure Fault

ON OFF High Pressure LOCKOUT

SLOW Flash

ON Discharge Line Tempera-

ture Fault

This code detects shorted sensor or high discharge temperatures. If the discharge line temperature exceeds a temperature of 300ºF (148ºC) during compressor operation, the board will de−energize the compressor contactor output (and the defrost output if active). The compressor will remain off until the discharge temperature has dropped below 225ºF (107ºC).

FAST Flash

ON Discharge Line Tempera-

ture LOCKOUT

OFF Fast

Flash

Discharge Sensor Fault The board detects open sensor or out of temperature sensor range. This fault is

detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance is not within range after 90 seconds, the board will count one fault. After 5 faults, the board will lockout.

Fast Flash

OFF Discharge Sensor

LOCKOUT

Page 12

B − Two−Stage Scroll Compressor (B1)

FIGURE 9

TWO−STAGE MODULATED SCROLL

solenoid actuator coil

slider ring

The scroll compressor design is simple, efficient and requires few moving parts. A cutaway diagram of the scroll compressor is shown in figure 1.The scrolls are located in the top of the compressor can and the motor is located just below. The oil level is immediately below the motor.

The scroll is a simple compression concept centered around the unique spiral shape of the scroll and its inherent properties. Figure 10 shows the basic scroll form. Two identical scrolls are mated together forming concentric spiral shapes (figure 11). One scroll remains stationary, while the other is allowed to orbit" (figure 12). Note that the orbiting scroll does not rotate or turn but merely orbits" the stationary scroll.

FIGURE 10

SCROLL FORM

The counterclockwise orbiting scroll draws gas into the outer crescent shaped gas pocket created by the two scrolls (figure 4 − 1). The centrifugal action of the orbiting scroll seals off the flanks of the scrolls (figure 4 − 2). As the orbiting motion continues, the gas is forced toward the center of the scroll and the gas pocket becomes compressed (figure 4 −3). When the compressed gas reaches the center, it is discharged vertically into a chamber and discharge port in the top of the compressor (figure9). The discharge pressure forcing down on the top scroll helps seal off the upper and lower edges (tips) of the scrolls (figure 11). During a single orbit, several pockets of gas are compressed simultaneously providing smooth continuous compression.

FIGURE 11

STATIONARY

SCROLL

ORBITING SCROLL

DISCHARGE

SUCTION

CROSS−SECTION OF SCROLLS

TIPS SEALED BY

DISCHARGE PRESSURE

The scroll compressor is tolerant to the effects of liquid return. If liquid enters the scrolls, the orbiting scroll is allowed to separate from the stationary scroll. The liquid is worked toward the center of the scroll and is discharged. Due to its efficiency, the scroll compressor is capable of drawing a much deeper vacuum than reciprocating compressors. Deep vacuum operation can cause internal fusite arcing resulting in damaged internal parts and will result in compressor failure. This type of damage can be detected and will result in denial of warranty claims. The scroll compressor can be used to pump down refrigerant as long as the pressure is not reduced below 7 psig.

NOTE  During operation, the head of a scroll compressor may be hot since it is in constant contact with discharge gas.

The scroll compressors in all SPB*H4 model units are designed for use with HFC−410A refrigerant and operation at high pressures. Compressors are shipped from the factory with 3MA (32MMMA) P.O.E. oil. See electrical section in this manual for compressor specifications.

TWO−STAGE OPERATION

The two−stage scroll compressor operates like any standard scroll compressor with the exception the two−stage compressor modulates between first stage (low capacity approximately 67%) and second stage (high capacity). Modulation occurs when gas is bypassed through bypass ports (figure 13 bypass ports open) in the first suction pocket. This bypassing of gas allows the compressor to operate on first stage (low capacity) if thermostat demand allows. Indoor thermostat setting will determine first or second stage operation. The compressor will operate on first−stage until demand is satisfied or the indoor temperature reaches the thermostat set point calling for second−stage.

Second−stage (high capacity) is achieved by blocking the bypass ports (figure 13 bypass ports closed) with a slider ring. The slider ring begins in the open position and is controlled by a 24VDC internal solenoid. On a Y2 call the inter- nal solenoid closes the slider ring, blocking the bypass ports and bringing the compressor to high capacity. Two− stage modulation can occur during a single thermostat demand as the motor runs continuously while the compressor modulates from first−stage to second− stage.

Page 13

FIGURE 12

SCROLL

HOW A SCROLL WORKS

SUCTION

MOVEMENT OF ORBIT

STATIONARY SCROLL

ORBITING

CRESCENT

SHAPED GAS

POCKET

HIGH

PRESSURE

GAS

DISCHARGE

POCKET

FLANKS

SEALED BY

CENTRIFUGAL

FORCE

SUCTION

INTERMEDIATE

PRESSURE

GAS

SUCTION

POCKET

FIGURE 13

Bypass Ports

Closed

High Capacity

Bypass Ports

Open

Low Capacity

TWO−STAGE MODULATION

INTERNAL SOLENOID (L34)

The internal unloader solenoid controls the two−stage operation of the compressor by shifting a slide ring mechanism to open two by−pass ports in the first compression pocket of the scrolls in the compressor. The internal solenoid is activated by a 24 volt direct current solenoid coil. The coil power requires 20VAC. The internal wires from the solenoid in the compressor are routed to a 2 pin fusite con-

nection on the side of the compressor shell. The external electrical connection is made to the compressor with a molded plug assembly. This plug contains a full wave rectifier that converts 24 volt AC into 24 volt DC power to power the unloader solenoid. Refer to unit diagram for internal circuitry view of plug.

If it is suspect the unloader is not operating properly, check the following

Page 14

IMPORTANT

This performance check is ONLY valid on systems that have clean indoor and outdoor coils, proper airflow over coils, and correct system refrigerant charge. All components in the system must be functioning proper to correctly perform compressor modulation operational check. (Accurate measurements are critical to this test as indoor system loading and outdoor ambient can affect variations between low and high capacity readings).

STEP 1 Confirm low to high capacity compressor operation

Tools required

 Refrigeration gauge set

 Digital volt/amp meter

 Electronic temperature thermometer

 On-off toggle switch

Procedure

1. Turn main power "OFF" to outdoor unit.

2. Adjust room thermostat set point above (heating operation on heat pump) or below (cooling operation) the room temperature 5ºF.

3. Remove control access panel. Install refrigeration gauges on unit. Attach the amp meter to the common (black wire) wire of the compressor harness. Attach

thermometer to discharge line as close as possible to the compressor.

4. Turn toggle switch "OFF" and install switch in series with Y2 wire from room thermostat.

5. Cycle main power "ON."

6. Allow pressures and temperatures to stabilize before taking any measured reading (may take up to 10 minutes).

NOTE  Block outdoor coil to maintain a minimum of 375 psig during testing).

7. Record all of the readings for the Y1 demand on table

8. Close switch to energize Y2 demand.

9. Allow pressures and temperatures to stabilize before taking any measured reading (this may take up to 10 minutes).

10. Record all of the readings of Y2 demand on table 3.

NOTE  On new installations or installations that have shut down for an extended period of time, if the compressor does not cycle from low stage to high stage on the first attempt, it may be necessary to recycle the compressor back down to low stage and back up to high stage a few times in order to get the bypass seals to properly seat

Compare Y1 readings with Y2 readings in table 3. Some readings should be higher, lower or the same. If the readings follow what table 3 specifies, the compressor is operating and shifting to high capacity as designed. If the readings do not follow what table 3 specifies, continue to step 2 to determine if problem is with external solenoid plug power.

TABLE 3

Unit Readings

Compressor Operation

Y1 −

1st-Stage

Expected Results

Y2 −

2nd-Stage

Compressor

Voltage Same Amperage Higher

Condenser Fan motor

Amperage Same or Higher

Temperature

Ambient Same Outdoor Coil Discharge Air Higher in Cooling

Lower in Heating

Compressor Discharge Line Higher Indoor Return Air Same Indoor Coil Discharge Air Lower in Cooling

Higher in Heating

Pressures

Suction (Vapor) Lower Liquid Higher

Page 15

STEP 2 Confirm DC voltage output on compressor solenoid plug

A − Compressor solenoid plug WITH built in full wave−

rectifier (LSOM I) that converts 24 volt AC into 24 volt DC power. See Table 1 for units equipped with the LSOM I.

1. Shut power off to outdoor unit.

2. Supply 24 volts AC control voltage to the wire ends of the full wave rectifier plug. Listen for a click" as the solenoid is energized. See figure 14.

compressor

solenoid fusite

terminals

compressor

fusite

terminals

meter

rectifier plug leads

apply 24vac

FIGURE 14

3. Unplug the full wave rectifier plug from the fusite connection on the compressor.

4. Turn the low voltage power back onto the unit. Supply 24VAC to the wires of the full wave rectifier plug. Set volt meter to DC volts and measure the DC voltage at the female connector end of the full wave rectifier plug. The DC voltage reading should be 1.5 to 3 volts lower than the input voltage to the plug wire leads. (EX: Input voltage is 24VAC output voltage is 22VDC). See figure 15.

meter

rectifier plug leads

compressor

fusite

terminals

solenoid

fusite

terminals

compressor

apply 24vac

FIGURE 15

If the above checks verify that the solenoid plug is providing power to cycle into high capacity operation, continue to step 3 to determine if problem is with solenoid coil in compressor

STEP 3 Confirm internal unloader solenoid has proper resistance

1. Shut all power off to unit (main and low voltage)

2. Unplug the molded plug from the compressor solenoid 2−pin fusite.

3. Using a volt meter set on the 200 ohm scale

Replace the Compressor under these conditions:

Bad Solenoid

a. Measure the resistance at the 2−pin fusite. The resistance should be 32 to 60 ohms depending on compressor temperature. If no resist ancereplace compressor.

b. Measure the resistance from each fusite pin to ground. There should not be continuity to ground. If solenoid coil is grounded, replace compressor.

Good Solenoid

a. Seals not shifting, replace compressor b. Slider ring not shifting, replace compressor.

C − Outdoor Fan Motor

All units use single−phase PSC fan motors which require a run capacitor. In all units, the condenser fan is controlled by the compressor contactor.

ELECTRICAL DATA tables in this manual show specifications for condenser fans used in SPB*H4’s.

Access to the condenser fan motor on all units is gained by removing the four screws securing the fan assembly. See figure 16. The grill fan assembly can be removed from the cabinet as one piece. See figure 17. The condenser fan motor is removed from the fan guard by removing the four nuts found on top of the grill. See figure 17 if condenser fan motor replacement is necessary.

Make sure all power is disconnected before beginning electrical service procedures.

DANGER

FIGURE 16

Remove

screws

Remove

screws

ALIGN FAN HUB FLUSH WITH END OF SHAFT

FIGURE 17

NUTS (4)

Page 16

D − Reversing Valve L1 and Solenoid

A refrigerant reversing valve with electro−mechanical solenoid is used to reverse refrigerant flow during unit operation. The reversing valve requires no maintenance. It is not repairable. If the reversing valve has failed, it must be replaced.

E − Crankcase Heater (HR1) and Thermostat (S40)

The compressor in the unit is equipped with a 70 watt, belly band type crankcase heater. HR1 prevents liquid from accumulating in the compressor. HR1 is controlled by a thermostat located on the liquid line. When liquid line temperature drops below 50° F the thermostat closes energizing HR1. The thermostat will open, de−energizing HR1 once liquid line temperature reaches 70° F .

F − Drier

A filter drier designed for all SPB*H4 model units is factory installed in the liquid line. The filter drier is designed to remove moisture and foreign matter, which can lead to compressor failure.

Moisture and / or Acid Check

Because POE oils absorb moisture, the dryness of the system must be verified any time the refrigerant system is exposed to open air. A compressor oil sample must

be taken to determine if excessive moisture has been introduced to the oil. Table 4 lists kits available from Lennox to check POE oils.

If oil sample taken from a system that has been exposed to open air does not test in the dry color range, the filter drier MUST be replace.

IMPORTANT

Replacement filter drier MUST be approved for HFC−410A refrigerant and POE application.

Foreign Matter Check

It is recommended that a liquid line filter drier be replaced

when the pressure drop across the filter drier is greater than 4 psig. To safeguard against moisture entering the system follow the steps in section IV − sub section B − "Evacuating the System" when replacing the drier.

G − High/Low Pressure Switch

IMPORTANT

Pressure switch settings for HFC−410A refrigerant will be significantly higher than units with HCFC−22.

An auto-reset, single-pole/single-throw high pressure switch is located in the liquid line. This switch shuts off the compressor when liquid line pressure rises above the factory setting. The switch is normally closed and is permanently adjusted to trip (open) at 590 +

15 psi.

An auto-reset, single-pole/single-throw low pressure switch is located in the suction line. This switch shuts off the compressor when suction pressure drops below the factory setting. The switch is closed during normal operating pressure conditions and is permanently adjusted to trip (open) at 25 +

5 psi. The switch automatically resets when suction

line pressure rises above 40 +

5 psi. Under certain conditions the low pressure switch is ignored. See Pressure Switch Circuit in the Defrost Control description.

TABLE 4

KIT CONTENTS TUBE SHELF LIFE

10N46 − Refrigerant Analysis

Checkmate−RT700

10N45 − Acid Test Tubes

Checkmate−RT750A (three pack)

2 − 3 years @ room temperature. 3+ years refrigerated

10N44 − Moisture Test Tubes

Checkmate − RT751 Tubes (three pack)

6 − 12 months @ room temperature. 2 years refrigerated

74N40 − Easy Oil Test Tubes

Checkmate − RT752C Tubes (three pack)

2 − 3 years @ room temperature. 3+ years refrigerated

74N39 − Acid Test Kit

Sporlan One Shot − TA−1

III − REFRIGERANT SYSTEM

Refer to figure 18 and 19 for refrigerant flow in the heating and cooling modes. The reversing valve is energized during cooling demand and during defrost.

Page 17

FIGURE 18

SPB*H4 COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS)

OUTDOOR

COIL

EXPANSION/CHECK

VALV E

BI−FLOW

FILTER / DRIER

HFC−410A

DRUM

LOW

PRESSURE

HIGH

PRESSURE

COMPRESSOR

REVERSING VALVE

VAPOR

LINE

VALV E

MUFFLER

NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW

SERVICE

PORT

SUCTION

EXPANSION/CHECK

VALV E

INDOOR UNIT

OUTDOOR UNIT

LIQUID LINE

SERVICE

PORT

GAUGE MANIFOLD

INTERNAL

COMPRESSOR

LIMIT

DISTRIBUTOR

INDOOR

COIL

COIL SENSOR

FIGURE 19

SPB*H4 HEATING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS)

OUTDOOR

COIL

EXPANSION/CHECK

VALV E

BI−FLOW

FILTER / DRIER

HFC−410A

DRUM

LOW

PRESSURE

HIGH

PRESSURE

COMPRESSOR

REVERSING VALVE

VAPOR

LINE

VALV E

MUFFLER

NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW

SERVICE

PORT

SUCTION

EXPANSION/CHECK

VALV E

INDOOR UNIT

OUTDOOR UNIT

LIQUID LINE

SERVICE

PORT

GAUGE MANIFOLD

INTERNAL

COMPRESSOR

LIMIT

DISTRIBUTOR

INDOOR

COIL

COIL SENSOR

A − Plumbing

Field refrigerant piping consists of liquid and vapor lines from the outdoor unit (sweat connections). Use Lennox L15 (sweat) series line sets as shown in table 1.

Page 18

TABLE 1

Unit

Liquid

Line

Suction

Line

L15 Line Sets

−036,

−048

3/8 in.

(10 mm)

7/8 in.

(22 mm)

L15−65

15 ft. − 50 ft.

(4.6 m − 15 m)

−060

3/8 in.

(10 mm)

1−1/8 in.

(29 mm)

Field

Fabricated

B − Service Valves

IMPORTANT

Only use Allen wrenches of sufficient hardness (50Rc − Rockwell Harness Scale min). Fully insert the wrench into the valve stem recess. Service valve stems are factory torqued (from 9 ft lbs for small valves, to 25 ft lbs for large valves) to prevent refrigerant loss during shipping and handling. Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench, or stripping the valve stem recess.

Service valves (figures 20 and 21) and gauge ports are accessible from the outside of the unit. Use the service ports for leak testing, evacuating, charging and checking charge.

Each valve is equipped with a service port which has a factory−installed Schrader valve. A service port cap protects the Schrader valve from contamination and serves as the primary leak seal.

To Access Schrader Port:

1 − Remove service port cap with an adjustable wrench. 2 − Connect gauge to the service port. 3 − When testing is complete, replace service port cap. Tight-

en finger tight, then an additional 1/6 turn.

To Open Service Valve:

1 − Remove the stem cap with an adjustable wrench. 2 − Use a service wrench with a hex−head extension to

back the stem out counterclockwise as far as it will go.

NOTE  Use a 3/16" hex head extension for 3/8" line sizes or a 5/16" extension for large line sizes.

3 − Replace the stem cap. Tighten finger tight, then tighten

an additional 1/6 turn.

To Close Service Valve:

1 − Remove the stem cap with an adjustable wrench. 2 − Use a service wrench with a hex−head extension to turn

the stem clockwise to seat the valve. Tighten the stem firmly.

NOTE  Use a 3/16" hex head extension for 3/8" line sizes or a 5/16" extension for large line sizes.

3 − Replace the stem cap. Tighten finger tight, then tighten

an additional 1/6 turn.

Service Valve

(Valve Closed)

Schrader valve open

to line set when valve is

closed (front seated)

service

port

service

port cap

stem cap

insert hex

wrench here

(valve front seated)

to outdoor coil

to indoor coil

Service Valve

(Valve Open)

Schrader

valve

service

port

service port

cap

insert hex

wrench here

to indoor coil

to outdoor coil

stem cap

FIGURE 20

Vapor Line Ball Valve – 4 and 5 Ton Only

Vapor line service valves function the same way as the other valves, the difference is in the construction. If a valve has failed, you must replace it. A ball valve is illustrated in figure

21. The ball valve is equipped with a service port with a factory−

installed Schrader valve. A service port cap protects the Schrader valve from contamination and assures a leak−free seal.

Page 19

Ball Valve (Valve Open)

Schrader valve

service port

cap

stem cap

stem

Use Adjustable Wrench

To open: rotate Stem Clockwise 90°.

To close: rotate Stem Counter-clockwise 90°.

ball

(shown open)

to outdoor coil

to indoor coil

FIGURE 21

IV − CHARGING A − Leak Testing

After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks.

IMPORTANT

Leak detector must be capable of sensing HFC refrigerant.

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

Failure to follow this warning may result in personal injury or death.

WARNING

When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).

WARNING

Fire, Explosion and Personal Safety Hazard.

Failure to follow this warning could result in damage, personal injury or death.

Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause damage by fire and/or an explosion, that could result in personal injury or death.

Using an Electronic Leak Detector or Halide

1 − Connect a cylinder of HFC−410A to the center port of

the manifold gauge set.

2 − With both manifold valves closed, open the valve on the

HFC−410A cylinder (vapor only).

3 − Open the high pressure side of the manifold to allow the

HFC−410A into the line set and indoor unit. Weigh in a trace amount of HFC−410A. [A trace amount is a maximum of 2 ounces (57 g) or 3 pounds (31 kPa) pressure.] Close the valve on the R−410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC−410A cylinder.

4 − Connect a cylinder of nitrogen with a pressure regulat-

ing valve to the center port of the manifold gauge set.

5 − Connect the manifold gauge set high pressure hose to

the vapor valve service port. (Normally, the high pres-

sure hose is connected to the liquid line port; however, connecting it to the vapor port better protects the manifold gauge set from high pressure damage.)

6 − Adjust the nitrogen pressure to 150 psig (1034 kPa).

Open the valve on the high side of the manifold gauge set which will pressurize line set and indoor unit.

7 − After a few minutes, open a refrigerant port to ensure

the refrigerant you added is adequate to be detected. (Amounts of refrigerant will vary with line lengths.) Check all joints for leaks. Purge nitrogen and HFC−410A mixture. Correct any leaks and recheck.

B − Evacuating the System

Evacuating the system of non−condensables is critical for proper operation of the unit. Non−condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non−condensables and water vapor combine with refrigerant to produce substances that corrode copper piping and compressor parts.

NOTE  This evacuation process is adequate for a new installation with clean and dry lines. If excessive moisture is present, the evacuation process may be required more than once.

Page 20

IMPORTANT

Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument that reads from 50 microns to at least 10,000 microns.

1 − Connect manifold gauge set to the service valve ports :

 low pressure gauge to vapor line service valve

 high pressure gauge to liquid line service valve

2 − Connect micron gauge.

3 − Connect the vacuum pump (with vacuum gauge) to the

center port of the manifold gauge set.

4 − Open both manifold valves and start the vacuum

pump.

5 − Evacuate the line set and indoor unit to an absolute

pressure of 23,000 microns (29.01 inches of mercury). During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in absolute pressure. A rapid rise in pressure indicates a relatively large leak. If this occurs, repeat the leak testing procedure.

NOTE  The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.

6 − When the absolute pressure reaches 23,000 microns

(29.01 inches of mercury), close the manifold gauge valves, turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump. Attach the manifold center port hose to a nitrogen cylin-

der with pressure regulator set to 150 psig (1034 kPa) 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.

CAUTION

Danger of Equipment Damage. Avoid deep vacuum operation. Do not use compressors to evacuate a system. Extremely low vacuums can cause internal arcing and compressor failure. Damage caused by deep vacuum operation will void warranty.

7 − Shut off the nitrogen cylinder and remove the manifold

gauge hose from the cylinder. Open the manifold gauge valves to release the nitrogen from the line set and indoor unit.

8 − Reconnect the manifold gauge to the vacuum pump,

turn the pump on, and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20−minute period after shutting off the vacuum pump and closing the manifold gauge valves.

9 − When the absolute pressure requirement above has

been met, disconnect the manifold hose from the vacuum pump and connect it to an upright cylinder of HFC−410A refrigerant. Open the manifold gauge valves to break the vacuum from 1 to 2 psig positive pressure in the line set and indoor unit. Close manifold gauge valves and shut off theHFC−410A cylinder and remove the manifold gauge set.

Page 21

C − Charging  SSB*H4S41Y through

SSB*H4S43Y

Charge Using the Weigh-in MethodOutdoor

Temperature < 65ºF (18ºC)

If the system is void of refrigerant, or if the outdoor ambient temperature is cool, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit.

1. Recover the refrigerant from the unit.

2. Conduct leak check; evacuate as previously outlined.

3. Weigh in the unit nameplate charge. If weighing facilities are not available or if charging the unit during warm weather, use one of the following procedures.

Charge Using the Subcooling MethodOutdoor

Temperature <

65ºF (18ºC)

When the outdoor ambient temperature is below 65°F (18°C), use the subcooling method to charge the unit. If necessary, restrict the air flow through the outdoor coil to achieve pressures in the 325−375 psig (2240−2585 kPa) range. These higher pressures are necessary for checking the charge. Block equal sections of air intake panels and move obstructions sideways until the liquid pressure is in the 325−375 psig (2240−2585 kPa) range. See figure 22.

Blocking Outdoor Coil

BLOCK OUTDOOR COIL ONE SIDE AT A TIME WITH CARDBOARD OR PLASTIC SHEET UNTIL PROPER TESTING PRESSURES ARE REACHED.

CARDBOARD OR PLASTIC SHEET

FIGURE 22

1. With the manifold gauge hose still on the liquid service port and the unit operating stably, use a digital thermometer to check the liquid line temperature and record in table 2.

2. At the same time, record the liquid line pressure reading.

3. Use a temperature/pressure chart for HFC−410A (table

9) to determine the saturation temperature for the liquid line pressure reading; record in table 2.

4. Subtract the liquid line temperature from the saturation temperature (according to the chart) to determine the subcooling value.

5. Compare the subcooling value with those in table 2. If subcooling value is greater than shown, recover some refrigerant; if less, add some refrigerant.

TABLE 2

SPB036H4 Subcooling Values for Charging

Second Stage (High-Capacity)

SSB*H4S41Y through SSB*H4S43Y

 Saturation Temperature



 Liquid Line Temperature

 Subcooling Value

Model SPB036H4S41 SPB048H4S41 SPB060H4S41

°F (°C)* 7 (3.9) 9 (5) 8 (4.4)

*F: +/−1.0°; C: +/−0.5°

Charge Using the Approach MethodOutdoor

Temperature >

65ºF (18ºC)

The following procedure is intended as a general guide and is for use on expansion valve systems only. For best results, indoor temperature should be 70°F (21°C) to 80°F (26°C). Monitor system pressures while charging.

1. Check the outdoor ambient temperature using a digital thermometer and record in table 3.

2. Attach high pressure gauge set and operate unit for several minutes to allow system pressures to stabilize.

3. Compare stabilized pressures with those provided in tables 4 and 5, Normal Operating Pressures." Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system. Pressures higher than those listed indicate that the system is overcharged. Pressures lower than those listed indicate that the system is undercharged. Continue to check adjusted charge using approach values.

4. Use the same digital thermometer used to check outdoor ambient temperature to check liquid line temperature and record in table 3. Verify the unit charge using the approach method. The difference between the ambient and liquid temperatures should match values given in table 3. Add refrigerant to lower the approach temperature and remove it to increase the approach temperature. Loss of charge results in low capacity and efficiency.

5. If the values do not agree with those in table 3, add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature.

Page 22

TABLE 3

SPB036H4 Approach Values for Charging

Second Stage (High-Capacity)

SSB*H4S41Y through SSB*H4S43Y

 Liquid Line Temperature



 Outdoor Temperature

 Approach Temperature

Model SPB036H4S41 SPB048H4S41 SPB060H4S41

°F (°C)* 9 (5) 8 (4.4) 8 (4.4)

*F: +/−1.0°; C: +/−0.5°

TABLE 4

Normal Operating Pressures − Cooling

SSB*H4S41Y through SSB*H4S43Y

Model SPB036H4S41 SPB048H4S41 SPB060H4S41

°F (°C)

Liquid Vapor Liquid Vapor Liquid Vapor

First Stage (Low Capacity) Pressure

65 (18.3) 225 144 235 144 225 138

75 (23.9) 261 147 268 145 264 141

85 (29.4) 302 149 310 147 305 142

95 (35.0) 349 151 356 148 352 146

105 (40.6)

397 153 407 150 405 148

115 (46.1)

461 157 466 152 459 150

Second Stage (High Capacity) Pressure

65 (18.3) 239 139 244 140 241 134

75 (23.9) 278 141 283 141 280 136

85 (29.4) 322 143 326 144 324 137

95 (35.0) 367 146 374 147 373 138

105 (40.6)

426 148 427 148 425 142

115 (46.1)

489 151 491 151 486 146

1 These are most−popular−match−up pressures. Indoor match up,

indoor air quality, and indoor load cause pressures to vary. 2 Temperature of the air entering the outdoor coil. 3 Liquid ±10 and Vapor ±5 psig.

TABLE 5

Normal Operating Pressures − Heating

SSB*H4S41Y through SSB*H4S43Y

Model SPB036H4S41 SPB048H4S41 SPB060H4S41

°F (°C)

Liquid Vapor Liquid Vapor Liquid Vapor

First Stage (Low Capacity) Pressure

40 (4.4) 328 98 369 75 351 63

50 (10) 333 11 8 366 114 335 92

Second Stage (High Capacity) Pressure

20 (−7.0) 296 62 311 58 308 59

30 (−1.0) 309 75 334 72 323 70

40 (4.4) 322 92 354 89 318 69

50 (10) 336 11 3 381 108 329 82

1 These are most−popular−match−up pressures. Indoor match up,

indoor air quality, and indoor load cause pressures to vary. 2 Temperature of the air entering the outdoor coil. 3 Liquid ±10 and Vapor ±5 psig.

C − Charging  SSB*H4S44Y

TESTING AND CHARGING SYSTEM

This system uses HFC−410A refrigerant which operates at much higher pressures than HCFC−22. The pre−installed liquid line filter drier is approved for use with HFC−410A only. Do not replace it with components designed for use with HCFC−22. This unit is NOT approved for use with coils which use capillary tubes as a refrigerant metering device.

COOLING MODE INDOOR AIRFLOW CHECK

Check airflow using the Delta−T (

DT) process using the il-

lustration in figure 23.

HEATING MODE INDOOR AIRFLOW CHECK

Blower airflow (CFM) may be calculated by energizing electric heat and measuring:

 Temperature rise between the return air and supply air

temperatures at the indoor coil blower unit,

 Measuring voltage supplied to the unit,  Measuring amperage being drawn by the heat unit(s).

Then, apply the measurements taken in following formula to determine CFM:

CFM =

Amps x Volts x 3.41

1.08 x Temperature rise (F)

CALCULATING CHARGE

If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total refrigerant charge:

Amount specified on nameplate

Adjust amount. for variation in line set length listed on table in figure 24.

Additional charge specified per indoor unit match−up listed in tables 6 through 8.

To ta l charge

+ + =

Page 23

Step 1. Determine the desired DTMeasure entering air tempera- ture using dry bulb (A) and wet bulb (B). DT is the intersecting value of A and B in the table (see triangle).

Step 2. Find temperature drop across coilMeasure the coil’s dry bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (T

Drop

) = A minus C.

Step 3. Determine if fan needs adjustmentIf the difference be- tween the measured T

Drop

and the desired DT (T

Drop

–DT) is within

3º, no adjustment is needed. See examples: Assume DT = 15 and

A temp. = 72º, these C temperatures would necessitate stated actions:

Cº T

Drop

– DT = ºF ACTION

53º 19 – 15 = 4 Increase the airflow 58º 14 – 15 = −1 (within +

3º range) no change

62º 10 – 15 = −5 Decrease the airflow

Step 4. Adjust the fan speedSee indoor unit instructions to in-

crease/decrease fan speed.

Changing air flow affects all temperatures; recheck temperatures to confirm that the temperature drop and DT are within +

3º.

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12

72 20 20 19 18 17 17 16 15 15 14 13 12 11 10

70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

57 58 59 60 61 62 63 64 65 66 67 68 69 70

Temp. of air entering indoor coil ºF

INDOOR COIL

DRY BULBDRY

BULB

WET

BULB

Drop

19º

Dry−bulb

Wet−bulb ºF

72º

64º

53º

air flowair flow

All temperatures are expressed in ºF

Figure 23. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart

WEIGH IN

1. Check Liquid and suction line pressures

2. Compare unit pressures with tables 4 and 10, Normal Operating Pressures.

3. Conduct leak check; evacuate as previously outlined.

4. Weigh in the unit nameplate charge plus any charge required for line set differences over feet.

Liquid Line

Set Diameter

Ounces per 5 feet (g per 1.5 m)

adjust from 15 feet (4.6 m) line set*

3/8" (9.5 mm)

3 ounce per 5’ (85 g per 1.5 m)

NOTE − *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract this amount.

Refrigerant Charge per Line Set Length

This nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.

Figure 24. Using HFC−410A Weigh In Method

1 Check the airflow as illustrated in figure 23 to be sure the indoor airflow is as required. (Make any air

flow adjustments before continuing with the following procedure.)

2 Measure outdoor ambient temperature; determine whether to use cooling mode or heating mode to

check charge. 3 Connect gauge set. 4 Check liquid and vapor line pressures. Compare pressures with either heat or cooling mode normal

operating pressures in tables 4 and 10 (second stage − high capacity),

NOTE − The reference table is a general guide. Expect minor pressure variations. Significant differences may mean improper charge or other system problem.

5 Set thermostat for heat/cool demand, depending on mode being used:

Using cooling modeWhen the outdoor ambient temperature is 60°F (15°C) and above. Target

subcooling values (second stage − high capacity) in tables 4 are based on 70 to 80°F (21−27°C) indoor

return air temperature; if necessary, operate heating to reach that temperature range; then set thermostat

to cooling mode setpoint to 68ºF (20ºC) which should call for second stage (high capacity) cooling. When

pressures have stabilized, continue with step 6.

Using heating modeWhen the outdoor ambient temperature is below 60°F (15°C). Target

subcooling values (second stage − high capacity) in tables 4 and 10 are based on 65−75°F (18−24°C) indoor

return air temperature; if necessary, operate cooling to reach that temperature range; then set thermostat

to heating mode setpoint to 77ºF (25ºC) which should call for second stage (high capacity) heating. When

pressures have stabilized, continue with step 6.

6 Read the liquid line temperature; record in the LIQº space.

7 Read the liquid line pressure; then find its corresponding temperature in the temperature/ pressure chart

listed in table 15 and record it in the SATº space.

8 Subtract LIQº temperature from SATº temperature to determine subcooling; record it in SCº space.

9 Compare SCº results with tables 6 through 8, being sure to note any additional charge for line set and/or

match−up.

10 If subcooling value is greater than shown in tables 6 through 8 for the applicable unit, remove refrigerant;

if less than shown, add refrigerant.

11 If refrigerant is added or removed, repeat steps 4 through 10 to verify charge.

12 Disconnect gauge set and re−install both the liquid and suction service valve caps.

USE COOLING

MODE

USE HEATING

MODE

60ºF (15º)

SATº LIQº – SCº =

SUBCOOLING

Figure 25. Using HFC−410A Subcooling Method  Second Stage (High Capacity)

Page 24

Indoor Unit Matchups  SSB*H4S44Y

Table 6. − SSB024H4S44Y

INDOOR HEAT MATCHUP PUMP

Target Subcooling HeatCool

5ºF)(+1ºF)

**Add

charge

SPB036H4–036

lb oz

CH23–51 17 7 0 13

CH23–65 12 8 1 10

CBX26UH–030 25 8 1 14

CBX26UH–036 25 8 1 14

CB27UH−036 17 8 2 4

CB27UH−042 17 8 2 4

CB30U–31 17 6 0 0

CB30U–41/46 17 8 2 4

CBX32M–030 17 6 0 0

CBX32M–036 17 8 2 4

CBX32MV–024/030 17 6 0 0

CBX32MV–036 17 8 2 4

C33–44C 17 8 1 14

CH33–42B–2F 17 7 0 13

CH33–44/48B–2F 12 8 1 8

CH33–48C–2F 10 8 1 6

CH33–43B 9 10 1 6

CH33–49C 9 10 1 6

CR33–48B/C–F 25 8 2 0

CR33–50/60C–F 25 9 0 14

CX34–38A/B–6F Serial No# before 6007K 31 7 1 5

CX34–38A/B–6F Serial No# 6007K and after 10 8 1 12

CX34–43B/C–6F 10 8 1 6

CX34–60D 9 9 0 14

**Amount of charge required in additional to charge shown on unit nameplate. (Remember to consider line set length difference.)

Table 7. SSB036H4S44Y

INDOOR HEAT MATCHUP PUMP

Target Subcooling HeatCool

5ºF)(+1ºF)

**Add

charge

SPB036H4–048

lb oz

CH23–68 15 13 0 7

CB27UH−048 17 7 0 0

CB27UH−060 17 7 0 0

CB30U–51, –65 17 7 0 0

CBX32M–048, –060 17 7 0 0

CBX32MV–048, –060 17 7 0 0

CBX32MV–068 16 10 0 3

CH33–60D–2F 18 4 0 2

CH33–62D–2F 15 10 0 4

CR33–60 40 4 0 2

CX34–60D–6F 18 4 0 2

CX34–62D–6F 16 8 0 2

Table 8. SSB060H4S44Y

INDOOR HEAT MATCHUP PUMP

Target Subcooling HeatCool

5ºF)(+1ºF)

**Add

charge

SPB036H4SPB036H4–060

lb oz

CH23–68 13 14 3 3

CH23–65 18 2 0 0

CBX26UH–060 13 14 3 5

CB27UH−060 13 10 2 1

CBX32M–060 13 10 2 1

CBX32MV–060 13 10 2 1

CBX32MV–068 13 12 2 9

CH33–60D–2F 15 6 1 3

CH33–62D–2F 13 12 2 10

CR33–50/60C–F 30 6 1 3

CR33–60D–F 30 6 1 3

CX34–49C–6F 13 9 1 14

CX34–60D–6F 15 6 1 3

CX34–62C–6F 13 11 2 6

CX34–62D–6F 13 11 2 5

Table 9. HFC−410A Normal Operating Pressures −

Cooling

SSB*H4S44Y

SPB036

−024 −036 −048 −060

°F (°C)2Liq Vap Liq Vap Liq Vap Liq Vap

First Stage (Low Capacity) Pressure

65 (18.3) 232 146 225 144 235 144 225 138

75 (23.9) 264 148 261 147 268 145 264 141

85 (29.4) 307 149 302 149 310 147 305 142

95 (35.0) 353 151 349 151 356 148 352 146

105 (40.6) 403 153 397 153 407 150 405 148

115 (46.1) 460 155 461 157 466 152 459 150

Second Stage (High Capacity) Pressure

65 (18.3) 240 143 239 139 244 140 241 134

75 (23.9) 279 145 278 141 283 141 280 136

85 (29.4) 322 147 322 143 326 144 324 137

95 (35.0) 371 149 367 146 374 147 373 138

105 (40.6) 423 151 426 148 427 148 425 142

115 (46.1) 485 154 489 151 491 151 486 146

Page 25

Table 10. HFC−410A Normal Operating Pressures −

Heating

SSB*H4S44Y

XP16 −024 −036 −048 −060

°F (°C)2Liq Vap Liq Vap Liq Vap Liq Vap

First Stage (Low Capacity) Pressure

40 (4.4) 314 88 304 89 324 92 341 89

50 (10) 333 11 6 318 11 6 354 11 5 365 11 3

Second Stage (High Capacity) Pressure

20 (−7.0) 286 59 289 63 306 61 318 59

30 (−1.0) 303 74 303 77 322 70 335 73

40 (4.4) 321 89 314 88 345 92 348 86

50 (10) 346 109 333 11 0 370 11 0 369 107

1 Most−popular−match−up pressures. Indoor match up, indoor air quality, and indoor load cause pressures to vary. 2 Temperature of the air entering the outdoor coil. 3 Liquid ±10 and Vapor ±5 psig.

Use tables 9 and 10 to perform maintenance checks; it is not a procedure for charging the system. Minor variations in these pressures may be due to differences in installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system.

Indoor Unit Matchups  SSB*H4S45Y

Table 11. SPB036H4S45Y

Indoor Unit Match− up

Heating

5ºF

Cooling

1ºF

*Add

Charge

Subcooling lbs. oz.

CBX26UH−036 50 5 0 0

CBX27UH−036−230 22 7 0 9

CBX27UH−042−230 24 11 3 0

CBX32M−036 22 7 0 9

CBX32MV−036 22 7 0 9

CBX32MV−048 24 11 3 0

CBX40UHV−030 22 7 0 9

CBX40UHV−036 22 7 0 9

CBX40UHV−042 24 11 3 0

CBX40UHV−048 24 11 3 0

CH33−43B 13 10 2 7

CH33−48C 37 11 2 11

CH33−43C 37 11 2 11

CR33−48B/C 49 7 0 9

CX34−43B/C 29 9 2 11

CX34−50/60C 29 9 2 11

Table 12. SPB048H4S45Y

Indoor Unit Match− up

Heating

5ºF

Cooling

1ºF

*Add Charge

Subcooling lbs. oz.

CBX26UH−048−230 10 8 1 4

CBX27UH−048−230 19 9 1 4

CBX27UH−060−230 13 14 3 3

CBX32M−048 19 9 1 4

CBX32M−060 14 9 1 11

CBX32MV−048 19 9 1 4

CBX32MV−060 14 9 1 11

CBX32MV−068 9 8 1 11

CBX40UHV−048 19 9 1 4

CBX40UHV−060 14 9 1 11

CH23−68 24 10 1 12

CH33−49C 19 9 2 5

CH33−50/60C 19 9 2 5

CH33−60D 13 8 0 0

CH33−62D 11 9 1 4

CR33−50/60C 15 7 0 10

CR33−60D 15 7 0 10

CX34−60D 14 8 1 0

CX34−62D 9 9 1 6

CX34−62C 8 9 1 9

Table 13. SPB060H4S45Y

Indoor Unit Match− up

Subcooling lbs. oz.

CBX26UH−060 20 9 4 13

CBX27UH−060−230 10 6 2 3

CBX32M−060 17 6 1 12

CBX32MV−060 17 6 1 12

CBX32MV−068 15 7 2 1

CBX40UHV−060 17 6 1 12

CH33−50/60C 33 8 1 0

CH33−62D 15 7 1 4

CH23−68 37 9 2 10

CR33−50/60C 24 7 0 0

CR33−60D 24 7 0 0

CX34−62C 21 9 2 16

CX34−62D 13 7 1 4

*Amount of charge required in additional to charge shown on unit nameplate. (Remember to consider line set length difference.)

Page 26

Table 14. Normal Operating Pressures* SPB*H4S45Y

Use tables to perform maintenance checks; it is not a procedure for charging the system. Minor variations in these pressures may be due to differences in installations. Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system.

Normal Operating Pressures − Cooling

SPB*

−036 −048 −060

°F

(°C)**

Liq Va p Liq Vap Liq Vap

First Stage (Low Capacity) Pressure

(18.3)

220 141 224 143 230 137

(23.9)

254 144 259 143 267 139

(29.4)

295 148 302 147 311 141

(35.0)

340 150 346 149 357 144

105

(40.6)

389 153 396 152 398 147

115

(46.1)

444 156 450 155 453 149

Second Stage (High Capacity) Pressure

(18.3)

232 129 238 138 232 131

(23.9)

269 136 278 140 276 133

(29.4)

312 140 321 142 320 136

(35.0)

346 142 372 144 367 138

105

(40.6)

409 145 424 147 421 141

115

(46.1)

465 148 481 149 479 144

Normal Operating Pressures − Heating

First Stage (Low Capacity) Pressure

(10)

350 115 336 114 385 108

(15.5)

372 136 363 135 414 126

Second Stage (High Capacity) Pressure

(−7.0)

321 61 289 57 332 59

(−1.0)

347 74 294 69 349 67

(4.4)

367 90 321 80 361 75

(10)

387 110 341 110 383 85

(15.5)

395 131 361 128 425 122

* Typical pressures only, expressed in psig (liquid +/− 10 and va-

por+/− 5 psig); indoor match up, indoor air quality, and indoor load will cause the pressures to vary. These operating pressures are also listed on the unit charging sticker (580005−01) located on the access panel.

** Temperature of air entering outdoor coil.

Table 15. HFC−410A Temp. (°F) − Pressure (Psig)

°F

Psig °F Psig °F Psig °F Psig

32 100.8 63 178.5 94 290.8 125 445.9 33 102.9 64 181.6 95 295.1 126 451.8

34 105.0 65 184.3 96 299.4 127 457.6 35 107.1 66 187.7 97 303.8 128 463.5 36 109.2 67 190.9 98 308.2 129 469.5 37 111.4 68 194.1 99 312.7 130 475.6 38 113.6 69 197.3 100 317.2 131 481.6 39 115.8 70 200.6 101 321.8 132 487.8 40 118.0 71 203.9 102 326.4 133 494.0 41 120.3 72 207.2 103 331.0 134 500.2 42 122.6 73 210.6 104 335.7 135 506.5 43 125.0 74 214.0 105 340.5 136 512.9 44 127.3 75 217.4 106 345.3 137 519.3 45 129.7 76 220.9 107 350.1 138 525.8 46 132.2 77 224.4 108 355.0 139 532.4 47 134.6 78 228.0 109 360.0 140 539.0 48 137.1 79 231.6 11 0 365.0 141 545.6 49 139.6 80 235.3 111 370.0 142 552.3 50 142.2 81 239.0 11 2 375.1 143 559.1 51 144.8 82 242.7 11 3 380.2 144 565.9 52 147.4 83 246.5 11 4 385.4 145 572.8 53 150.1 84 250.3 11 5 390.7 146 579.8 54 152.8 85 254.1 11 6 396.0 147 586.8 55 155.5 86 258.0 11 7 401.3 148 593.8 56 158.2 87 262.0 11 8 406.7 149 601.0 57 161.0 88 266.0 11 9 412.2 150 608.1 58 163.9 89 270.0 120 417.7 151 615.4 59 166.7 90 274.1 121 423.2 152 622.7 60 169.6 91 278.2 122 428.8 153 630.1 61 172.6 92 282.3 123 434.5 154 637.5 62 175.4 93 286.5 124 440.2 155 645.0

V − SERVICE AND RECOVERY

WARNING

Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.

IMPORTANT

Use recovery machine rated for HFC−410A refrigerant.

If the SPB*H4 system must be opened for any kind of service, such as compressor or drier replacement, you must take extra precautions to prevent moisture from entering the system. The following steps will help to minimize the amount of moisture that enters the system during recovery of HFC−410A. 1 − Use a regulator−equipped nitrogen cylinder to break

the system vacuum. Do not exceed 5 psi. The dry nitrogen will fill the system, and will help purge any moisture.

2 − Remove the faulty component and quickly seal the sys-

tem (using tape or some other means) to prevent additional moisture from entering the system.

Page 27

3 − Do not remove the tape until you are ready to install

new component. Quickly install the replacement component.

4 − Evacuate the system to remove any moisture and other

non−condensables.

The SPB*H4 system MUST be checked for moisture any time the sealed system is opened.

Any moisture not absorbed by the polyol ester oil can be removed by triple evacuation. Moisture that has been absorbed by the compressor oil can be removed by replacing the drier.

IMPORTANT

Evacuation of system only will not remove moisture from oil. Drier must be replaced to eliminate moisture from POE oil.

VI − MAINTENANCE

In order to maintain the warranty on this equipment, the SPB*H4 system must be serviced annually and a record of service maintained. The following should be checked between annual maintenance:

A − Outdoor Unit

1 − Clean and inspect the outdoor coil. The coil may be

flushed with a water hose. Ensure the power is turned off before you clean the coil.

2 − Condenser fan motor is pre−lubricated and sealed. No

further lubrication is needed.

3 − Visually inspect connecting lines and coils for evidence

of oil leaks. 4 − Check wiring for loose connections. 5 − Check for correct voltage at unit (unit operating). 6 − Check amp−draw condenser fan motor.

Unit nameplate _________ Actual ____________ .

NOTE  If owner complains of insufficient cooling, the unit should be gauged and refrigerant charge checked. Refer to section on refrigerant charging in this instruction.

1 − Clean and inspect condenser coil. (Coil may be flushed

with a water hose after disconnecting power). 2 − Visually inspect all connecting lines, joints and coils for

evidence of oil leaks.

B − Indoor Coil

1 − Clean coil, if necessary.

2 − Check connecting lines and coils for evidence of oil

leaks.

3 − Check the condensate line and clean it if necessary.

C − Indoor Unit

1 − Clean or change filters. 2 − Adjust blower speed for cooling. Measure the pressure

drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure.

3 − Belt Drive Blowers − Check belt for wear and proper ten-

sion. 4 − Check all wiring for loose connections 5 − Check for correct voltage at unit (blower operating). 6 − Check amp−draw on blower motor

Unit nameplate_________ Actual ____________.

VII − BRAZING

Before brazing remove access panels and any piping panels to avoid burning off paint. Be aware of any components ie, service valves, reversing valve, pressure switches that may be damaged due to brazing heat.

When making line set connections, use 1 to 2 psig dry nitrogen to purge the refrigerant piping. This will help to prevent oxidation into the system.

WARNING

Danger of explosion: Can cause equipment damage, injury or death. When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).

1 − .Cut ends of copper square (free from nicks or dents).

Debur the ends. The pipe must remain round, do not

pinch end of line. 2 − Wrap wet rag around any components that may be da-

maged. 3 − Use silver alloy brazing rods (5 or 6 percent minimum

silver alloy for copper to copper brazing or 45 percent

silver alloy for copper to brass or copper to steel braz-

ing) which are rated for use with HCFC−22 and

HFC−410A refrigerant. 4 − After brazing quench the joints with a wet rag to prevent

possible heat damage to any components.

Page 28

VIII − WIRING DIAGRAM AND SEQUENCE OF OPERATION

Page 29

Figure 26. Unit Wiring Diagram (−036 and −048 Sizes)  SPB*H4S45Y

Page 30

Figure 27. Unit Wiring Diagram (−060 Size Only)  SPB*H4S45Y

Page 31

Sequence of Operation

Cooling

A – First Stage Low Capacity

Transformer from indoor unit supplies 24VAC power to the thermostat and outdoor unit controls.

1− Internal wiring energizes terminal O by cooling mode

selection, energizing the reversing valve. Cooling demand initiates at Y1 in the thermostat.

2 − The defrost board checks for open low or high−pres-

sure switches and proper coil, ambient and discharge sensor readings. If checks show no issues, the defrost board sends 24 volts through Y1 OUT signal to the K1 compressor contactor coil.

3− K1−1 N.O. closes energizing compressor B1 and out-

door fan motor B4.

4− Solenoid L34 is NOT energized. The slider ring re-

mains open limiting compressor to low capacity.

B – Second Stage High Capacity

5− Second stage thermostat demand goes through Y2 on

the defrost board and energizes rectifier plug D4. D4 converts the AC voltage to DC voltage and energizes L34 unloader solenoid. L34 then closes the slider ring, allowing the compressor to operate at high capacity.

Heating

A – Low Capacity

1− Internal wiring de−energizes terminal O by heating

mode selection, de−energizing the reversing valve. Heating demand initiates at Y1 in the thermostat.

2 − The defrost board checks for open low or high−pres-

sure switches and proper coil, ambient and discharge sensor readings. If checks show no issues, the defrost board sends 24 volts through Y1 OUT signal to the K1 compressor contactor coil.

3− K1−1 closes, energizing the compressor and outdoor

fan motor.

4− Solenoid L34 is NOT energized. The slider ring re-

mains open limiting compressor to low capacity.

B – High Capacity (Ambient temperature above

defrost board Y2 lock−in temperature)

1− Room thermostat in heating mode. Room thermostat

outputs Y1 and Y2 (if applicable to that room thermostat) signal to the defrost board in the heat pump and to the indoor unit.

2− The defrost board checks for open low or high−pres-

sure switches and proper coil, ambient and discharge sensor readings. If checks show no issues, the defrost board sends 24 volts through Y1 OUT signal to the K1 compressor contactor coil.

3 − The defrost board sends 24 volts through Y2 OUT to

the L34 compressor solenoid plug. The 2− wire com-

pressor solenoid plug converts the 24volt AC outputs to

a 24volt DC signal input to the L34 internal high capac-

ity solenoid valve in the compressor. 4 − K1−1 closes, energizing the compressor and outdoor

fan motor through the normally closed fan relay con-

tacts on the defrost board. The compressor runs high

capacity.

B – High Capacity (Ambient temperature below

defrost board Y2 lock−in temperature)

1 − Room thermostat in heating mode. Room thermostat

outputs Y1 signal to the defrost board in the heat pump

and to the indoor unit. 2 − The defrost board checks for open low or high−pres-

sure switches and proper coil, ambient and discharge

sensor readings. If checks show no issues, the defrost

board sends 24 volts through Y1 OUT signal to the K1

compressor contactor coil. 3 − The defrost board Y2 locks in

sends 24 volts through Y2 OUT to the L34 compressor solenoid plug. The plug converts the 24volt AC outputs to a 24volt DC signal input to the L34 internal high capacity solenoid valve in the compressor.

4 − K1−1 closes, energizing the compressor and outdoor

fan motor through the normally closed fan relay contacts on the defrost board. The compressor runs on high capacity.

Defrost Mode

When a defrost cycle is initiated, the control energizes the reversing valve solenoid and turns off the condenser fan. The control will also put 24VAC on the W1" (auxiliary heat) line. The unit will stay in this mode until either the coil sensor temperature is above the selected termination temperature, the defrost time of 14 minutes has been completed, or the room thermostat demand cycle has been satisfied. (If the temperature select shunt is not installed, the default termination temperature will be 90°F.) If the room thermostat demand cycle terminates the cycle, the defrost cycle will be held until the next room thermostat demand cycle. If the coil sensor temperature is still below the selected termination temperature, the control will continue the defrost cycle until the cycle is terminated in one of the methods mentioned above. If a defrost is terminated by time and the coil temperature did not remain above 35°F (2°C) for 4 minutes the control will go to the 34−minute Time/Temperature mode.

Lennox SPBH4 Unit Information

Specifications and Main Features

Frequently Asked Questions

User Manual