Lennox SSBH4, SSB036H4, SSB048H4, SSB060H4 User Manual
Corp. 0628−L5
Revised 02−2007
Service Literature
SSB*H4 Commercial Air Conditioner
The SSB*H4 is a high efficiency commercial split−system
condensing unit, which features a two stage scroll compressor 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 discuss 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 subject to change.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
SSB*H4
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).
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).
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 Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data Page 2. . . . . . . .
I Application Page 4. . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components Page 4. . . . . . . . . . . . . . . . . .
III Refrigeration System Page 12. . . . . . . . . . . . . .
IV Charging Page 13. . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery Page 17. . . . . . . . . . . . .
VI Maintenance Page 17. . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 18.
Page 1
©2006 Lennox Industries Inc.
SPECIFICATIONS
General
Data
Connections
(sweat)
Refrigerant
Outdoor
Coil
Model No. SSB036H4 SSB048H4 SSB060H4
Nominal Tonnage 3
4 5
Liquid line (o.d.) − in. 3/8 3/8 3/8
Suction line (o.d.) − in. 7/8
1
R−410A charge furnished 8 lb. 9 oz. 11 lb. 4 oz. 14 lb. 2 oz.
Net face area − sq. ft.
Outer coil 16.33 21.00 24.93
Inner coil 15.76
7/8 1−1/8
20.27 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 3060 3955 4380
Rpm 845 835 850
Watts 215 320 280
Shipping Data − lbs. 1 pkg. 229 257 309
ELECTRICAL DATA
Line voltage data − 60hz 208/230V−3ph 460V−3ph 208/230V−3ph 460V−3ph 208/230V−3ph 460V−3ph
2
Maximum overcurrent protection (amps) 25 10 30 15 40 20
3
Minimum circuit ampacity 15.04 6.20 18.53 8.91 23.83 12.21
Compressor
Rated load amps 11.15 4.48 13.46 6.41 17.62 8.97
Outdoor Fan
Motor
Locked rotor amps 58 29 88 41 135 62
Power factor 0.99 0.99 0.99 0.99 0.99 0.99
Full load amps 1.1 0.6 1.7 0.9 1.8 1.0
Locked Rotor amps 2.1 1.1 3.1 2.1 2.9 2.0
Page 2
OPTIONAL ACCESSORIES − must be ordered extra
Compressor Low Ambient Cut−Off 45F08
Compressor Time−Off Control 47J27
Freezestat
3/8 in. tubing 93G35
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
Refrigerant
Line Sets
L15−65−30 L15−65−40
L15−65−50
Field Fabricate
Time Delay Relay 58M81
NOTE − Extremes of operating range are plus 10% and minus 5% of line voltage.
1
Refrigerant charge sufficient for 15 ft. length of refrigerant lines.
2
HACR type breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
LOW AMBIENT CONTROL Option (Down to 0°F)
Order one each: Speed Control Kit, Weatherproof Kit, Outdoor Fan Motor and Capacitor
Model No. SSB036H4
Speed Control Kit X5867
Weatherproof Kit 56N41
Outdoor
Fan Motor
1/2 HP − 208/230V 69H75
460V 69H76
Capacitor with bracket 53H06
SSB048H4 SSB060H4
Page 3
I − APPLICATION
SSB*H4 condensing units are available in 3, 4 and 5 ton capacities. 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.
II − UNIT COMPONENTS
Unit components are illustrated in figure 1.
SSB*H4 PARTS ARRANGEMENT
Removing/Installing Louvered Panels
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.
SCREW
HOLES
LIP
Detail
A
DUAL CAPACITOR
CONTACTOR
FILTER DRIER
OUTDOOR FAN
COMPRESSOR
HIGH
PRESSURE
SWITCH
LOW
PRESSURE
SWITCH
FIGURE 1
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 2).
Detail
B
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE PANEL
Detail C
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT
AS POSSIBLE) WHILE INSTALLING PANEL.
ANGLE MAY BE TOO
EXTREME
PREFERRED ANGLE
FOR INSTALLATION
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
Detail D
FIGURE 2
2 − Hold the panel firmly throughout this procedure. Ro-
tate bottom corner of panel away from hinge corner post
until lower 3 tabs clear the slots (see figure 2, Detail B).
3 − Move panel down until lip of upper tab clears the top slot
in corner post (see figure 2, Detail A).
Page 4
Position and Install PanelPosition the panel almost parallel with the unit (figure 2, 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 2,
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.
A − Control Box (Figure 3)
SSB*H4 units are not equipped with a 24V transformer. All
24 VAC controls are powered by the indoor unit. Refer to
wiring diagram.
Electrical openings are provided under the control box cover. Field thermostat wiring is made to color-coded pigtail
connections.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
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.
1 − Compressor Contactor K1
The compressor is energized by a single−pole contactor located in the control box. See figure 3. K1 is energized by the
indoor thermostat terminal Y1 (24V) when thermostat demand is present.
2 − Dual Capacitor C12
The compressor and fan in SSB*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.
CAUTION
In order to avoid injury, take precaution when
lifting heavy objects.
B − Two−Stage Scroll Compressor (B1)
TWO−STAGE MODULATED SCROLL
slider ring
COMPRESSOR
CONTACTOR
(K1)
GROUNDING
LUG
CONTROL BOX
FIGURE 3
DUAL CAPACITOR
(C12)
solenoid actuator coil
FIGURE 1
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 2 shows the basic scroll form. Two identical
scrolls are mated together forming concentric spiral shapes
(figure 3 ). One scroll remains stationary, while the other is
allowed to orbit" (figure 4). Note that the orbiting scroll does
not rotate or turn but merely orbits" the stationary scroll.
Page 5
SCROLL FORM
FIGURE 2
CROSS−SECTION OF SCROLLS
DISCHARGE
PRESSURE
TIPS SEALED BY
DISCHARGE PRESSURE
DISCHARGE
STATIONARY
SCROLL
SUCTION
ORBITING SCROLL
FIGURE 3
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 (figure1). The discharge pressure forcing down on
the top scroll helps seal off the upper and lower edges (tips) of
the scrolls (figure 3 ). During a single orbit, several pockets of
gas are compressed simultaneously providing smooth continuous compression.
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. If the compressor is replaced, conventional Lennox cleanup practices
must be used.
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 HSXA19 model units are designed for use with R410A 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 5 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 5 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 internal sole-
noid 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.
NOTE − During operation, the head of a scroll compressor
may be hot since it is in constant contact with discharge
gas.
Page 6
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