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Service Literature
The SSB*H4 is a high efficiency commercial split−system
condensing unit, which features a two stage scroll compres-
sor and R−410A refrigerant. SSB*H4 units are available in 3,
4and 5 ton capacities.. The series is designed for use with
an expansion valve (approved for use with R−410A) in the
indoor unit. This manual is divided into sections which dis-
cuss the major components, refrigerant system, charging
procedure, maintenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub-
ject to change.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
WARNING
Warranty will be voided if covered equipment is re-
moved 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 dam-
aging chemicals).
DANGER
Shock Hazard
Remove all power at disconnect
before removing access panel.
Single phase SSB*H4 units use
single-pole contactors. Potential
exists for electrical shock resulting
in injury or death.
Line voltage exist at all components
(even when unit is not in operation).
Corp. 0628−L5
Revised 02−2007
SSB*H4 Commercial Air Conditioner
Page 1
IMPORTANT
Operating pressures of this R−410A unit are higher
than pressures in R−22 units. Always use service
equipment rated for R410A.
TABLE OF CONTENTS
General
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data
I Application
. . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components
. . . . . . . . . . . . . . . . . .
III Refrigeration System
. . . . . . . . . . . . . .
IV Charging
. . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery
VI Maintenance
. . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation
SSB*H4
Page 1
. . . . . . . .
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Page 4
Page 4
Page 12
Page 13
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Page 17
Page 17
.
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©2006 Lennox Industries Inc.
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Related Manuals for Lennox SSB*H4
Summary of Contents for Lennox SSB*H4
- Page 1 The SSB*H4 is a high efficiency commercial split−system condensing unit, which features a two stage scroll compres- sor and R−410A refrigerant. SSB*H4 units are available in 3, 4and 5 ton capacities.. The series is designed for use with an expansion valve (approved for use with R−410A) in the indoor unit.
-
Page 2: Specifications
SPECIFICATIONS General Model No. SSB036H4 SSB048H4 SSB060H4 Data Nominal Tonnage Connections Liquid line (o.d.) − in. (sweat) (sweat) Suction line (o.d.) − in. 1−1/8 Refrigerant R−410A charge furnished 8 lb. 9 oz. 11 lb. 4 oz. 14 lb. 2 oz. Outdoor Net face area −... - Page 3 OPTIONAL ACCESSORIES − must be ordered extra Compressor Low Ambient Cut−Off 45F08 Compressor Time−Off Control 47J27 3/8 in. tubing 93G35 Freezestat 5/8 in. tubing 50A93 Indoor Blower Relay 40K58 Low Ambient Kit (down to 30°F) 34M72 Low Ambient Control Option (down to 0°F) See table below See table below See table below...
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Page 4: Unit Components
Removing/Installing Louvered Panels IMPORTANT! Do not allow panels to hang on unit by top tab. Tab SSB*H4 condensing units are available in 3, 4 and 5 ton ca- is for alignment and not designed to support weight of panel. pacities. All major components (indoor blower and coil) must... -
Page 5: Electrostatic Discharge (Esd)
2 − Dual Capacitor C12 Rotate panel to vertical to fully engage all tabs. The compressor and fan in SSB*H4 series units use per- Holding the panel’s hinged side firmly in place, close the manent split capacitor motors. The capacitor is located right−hand side of the panel, aligning the screw holes. -
Page 6: Two−Stage Operation
If the com- NOTE − During operation, the head of a scroll compressor may be hot since it is in constant contact with discharge pressor is replaced, conventional Lennox cleanup practices must be used. gas. - Page 7 HOW A SCROLL WORKS MOVEMENT OF ORBIT SUCTION SUCTION INTERMEDIATE PRESSURE CRESCENT SHAPED GAS POCKET ORBITING SCROLL SUCTION POCKET FLANKS SEALED BY STATIONARY SCROLL CENTRIFUGAL SUCTION FORCE SUCTION HIGH DISCHARGE PRESSURE POCKET FIGURE 4 TWO STAGE MODULATION Bypass Ports Bypass Ports Closed Open High Capacity...
- Page 8 INTERNAL SOLENOID (L34) Procedure 1 − Turn main power "OFF" to outdoor unit. The internal unloader solenoid controls the two−stage op- 2 − Adjust room thermostat set point above (heating opera- eration of the compressor by shifting a slide ring mechanism tion on heat pump) or below (cooling operation) the to open two by−pass ports in the first compression pocket of room temperature 5ºF.
- Page 9 TABLE 1 Cooling Operation Unit Readings Unit Readings 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 Compressor Discharge Line Higher Indoor Return Air Same Indoor Coil Discharge Air...
- Page 10 ELECTRICAL DATA tables in this manual show specifi- D − Low Pressure Switch cations for condenser fans used in SSB*H4’s. An auto-reset, single-pole/single-throw low pressure switch Access to the condenser fan motor on all units is gained is located in the suction line.
- Page 11 It is recommended that a liquid line filter drier be replaced introduced to the oil. Table 2 lists kits available from Lennox when the pressure drop across the filter drier is greater than to check POE oils.
-
Page 12: Refrigerant System
Tighten the from the condensing unit (sweat connections) to the indoor stem firmly. evaporator coil (sweat connections). Use Lennox L15 NOTE − Use a 3/16" hex head extension for 3/8" line (sweat) series line sets as shown in table 3. - Page 13 Ball Valve (Valve Open) WARNING Use Adjustable Wrench Danger of explosion! To open: rotate Stem Clockwise 90°. To close: rotate Stem Counter-clockwise 90°. When using a high pressure gas such as dry nitrogen to pressurize a refriger- stem cap ant or air conditioning system, use a to outdoor coil regulator that can control the pressure stem...
- Page 14 1 − Connect manifold gauge set to the service valve ports : vacuum from 1 to 2 psig positive pressure in the line set and indoor unit. Close manifold gauge valves and shut low pressure gauge to vapor line service valve high pressure gauge to liquid line service valve off the R−410A cylinder and remove the manifold gauge set.
- Page 15 2 − Evacuate the system to remove as much of the moisture Charge Using Weigh-in Method, Fixed Orifice or TXV Systems Outdoor Temp. < 65ºF (18ºC) as possible. Use dry nitrogen to pressurize the system If the system is void of refrigerant, or if the outdoor ambient and check for leaks.
- Page 16 R−410A Temperature (°F) − Pressure (Psig) TABLE 7 °F Psig °F Psig °F Psig °F Psig SSB*H4 Approach Values for Charging (Second 100.8 181.6 299.4 451.8 Stage) 105.0 187.7 308.2 463.5 _ Liquid Line Temperature 109.2...
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Page 17: Service And Recovery
Ensure the power is turned off before you clean the coil. If the SSB*H4 system must be opened for any kind of ser- 2 − Condenser fan motor is prelubricated and sealed. No vice, such as compressor or drier replacement, you must further lubrication is needed. - Page 18 VII − WIRING DIAGRAMS AND SEQUENCE OF OPERATION Sequence of Operation SSB*H4 NOTE − First and second stage cool operate independent of each other and can modulate back and forth according to thermostat demand. First Stage Cool (low capacity) 1. Cooling demand initiates at Y1 in the thermostat.
- Page 19 Sequence of Operation SSB*H4 NOTE − First and second stage cool operate independent of each other and can modulate back and forth according to thermostat demand. First Stage Cool (low capacity) 1. Cooling demand initiates at Y1 in the thermostat.