15CHAX
Service Literature
Corp. 0634−L6
15CHAX SERIES UNITS
The 15CHAX packaged heat pump units are available in
sizes ranging from 2 through 5 tons (7.0 through 17.6 kW).
15CHAX units are designed for R−410A refrigerant and outdoor residential use only. Units can be installed at ground
level or rooftop applications. Optional field installed supplemental electric heat is available in 5, 7.5, 10, 15 and 20 kW.
The 15CHAX units utilize a scroll compressor. It operates
much like a standard compressor, but the scroll compressor
is unique in the way that it compresses refrigerant. The
compressor has overload protection.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are subject to change. Procedures outlined in this manual are presented as a recommendation only and do not supersede or
replace local or state codes.
IMPORTANT
Operating pressures of a R−410A unit are higher
than pressures in R−22 units. Always use service
equipment rated for R−410A.
2 to 5 Ton (7.0 to 17.6 kW)
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.
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.
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.
TABLE of CONTENTS
Specifications / Accessories Page 2. . . . . . . . . .
Electric Heat Capacities Page 3. . . . . . . . . . . . .
Electrical / Electric Heat Data Page 3. . . . . . . .
Parts Arrangement Page 4. . . . . . . . . . . . . . . . .
I Application Page 5. . . . . . . . . . . . . . . . . . . . . . .
II Unit Components Page 5. . . . . . . . . . . . . . . . .
III Electric Heat Page 13. . . . . . . . . . . . . . . . . . . .
IV Charging Page 14. . . . . . . . . . . . . . . . . . . . . . . .
V Maintenance Page 14. . . . . . . . . . . . . . . . . . . . .
VII Wiring Diagrams Page 15. . . . . . . . . . . . . . . .
Page 1
© 2006 Lennox Industries Inc.
Litho U.S.A.
SPECIFICATIONS
g
p
208/240V−1ph
g
g
Power Kits
General
Data
Model No.
Nominal Tonnage 2 2.5 3 3.5 4 5
Cooling
Performance
Total cooling capacity − Btuh 23,000 28,200 35,000 41,500 47,500 59,000
Total unit watts 1850
2
SEER (Btuh/Watt) 14.50 14.00 15.00 14.50 14.00 14.00
EER (Btuh/Watt) 12.40 12.40 12.40 12.40 11.80 11.70
Sound Rating Number (dB) 77 77 77 79 79 79
Refrigerant Type R−410A R−410A R−410A R−410A R−410A R−410A
Refrigerant Charge 7 lbs. 8 oz. 6 lbs. 10 oz. 7 lbs. 13 oz. 11 lbs. 5 oz. 11 lbs. 13 oz. 11 lbs. 12 oz.
Outdoor
Coil
Net face area − sq. ft. (m2) 15.1 15.1 15.1 22 22 22
Tube dia. − in. (mm) & No. of rows 5/16 − 2 5/16 − 2 5/16 − 2 5/16 − 2 5/16 − 2 5/16 − 2
Fins per inch (m) 22 22 22 22 22 22
Indoor
Coil
Tube dia. − in. (mm) & No. of rows 3/8 − 2 3/8 − 2 3/8 − 4 3/8 − 2 3/8 − 3 3/8 − 4
Net face area − sq. ft. (m2) 4.67 4.67 4.67 6 6 6
Fins per inch (m) 14 14 14 14 14 14
Condensate drain size (fpt) − in. 3/4 3/4 3/4 3/4 3/4 3/4
Outdoor
Coil Fan
Indoor
Blower
Diameter − in. & No. of blades 22 − 3 22 − 3 22 − 3 26 − 3 26 − 3 26 − 3
Blower wheel size dia. x width − in. 10 x 6 10 x 6 10 x 8 10 x 10 10 x 10 10 x 10
Motor horsepower 1/5 1/5 1/5 1/4 1/4 1/4
Motor horsepower 1/2 1/2 1/2 3/4 3/4 3/4
Net weight of basic unit 370 370 390 500 510 510
Shipping weight of basic unit (1 Pkg.) 415 415 435 555 565 565
Electrical characteristics (60 hz) 208/230V−1ph−60hz
15CHAXA
−24
15CHAXA
−30
15CHAXA
−36
15CHAXA
−42
15CHAXA
−48
15CHAXA
2275 2820 3350 4030 5040
OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA
Compressor Crankcase Heater 93M04 S S S S S S
Compressor Hard Start Kit
Compressor Time−Off Control 47J27 S S S S S S
Electric
Heat
Size
−
5 kW − PHK05BP
7.5 kW − PHK07BP
10 kW − PHK10BP
15 kW − PHK15CP
20 kW − PHK20CP
3
Internal Filter Kit
(No.) and size of filters − in.
92M54 − (1) 20 x 25 S S S
92M55 − (2) 16 x 25
Lifting Brackets 92M51 S S S S S S
Low Ambient Kit 34M72 S S S S S S
PCO Accessory Kit 92M53 S S S S S S
Roof Curbs 8 inch height
14 inch height
SignatureStatt Home Comfort Control 81M27 S S S S S S
Single Point
Power Kits
For 5 kW Electric Heat
ASPWR813−01
For 7.5 kW Electric Heat
ASPWR814−01
For 10 kW Electric Heat
ASPWR815−01
For 15−20 kW Electric Heat
ASPWR816−01
NOTE−Extremesofoperatingrangeareplusandminus10%ofline voltage.
1
Annual Fuel Utilization Efficiency based on U.S. DOE test procedures and FTC labeling regulations.
2
Rated in accordance with ARI Standard 210/240; 95_F outdoor air temperature, 80_F db/67_F wb entering evaporator air.
3
Filters are not furnished and must be field provided. 1, 2 or 4 inch thick filters can be used.
4
HACR type circuit breaker or fuse.
5
RefertoNational or CanadianElectricalCodemanualtodeterminewire,fuseanddisconnectsizerequirements.
10J42 S S S S S
81J69 S
10W47 S S S S S S
10W48 S
10W49 S
10W50
10W51
S S S S S
S S S S S
S S S S
S S S
S S S
92M99
93M01
93M00
93M02
S S S
S
S S
S S S
S S S
13W88 S S S S S S
13W89 S
13W90 S
S S S S S
S S S S S
13W91 S S S S
−60
Page 2
ELECTRIC HEAT CAPACITIES
I
p
Protecti
Bl
Motor
A
Bl
Motor
nput
Volta ge
No of
Steps
208 1 3.8 12,800 1 5.6 19,200 1 7.5 17,900 1 11.2 38,200 1 15.0 51,200
220 1 4.2 14,300 1 6.3 21,500 1 8.4 20,100 1 12.6 43,000 1 16.8 57,300
230 1 4.6 15,700 1 6.9 23,500 1 9.2 21,900 1 13.8 47,000 1 18.4 62,700
240 1 5.0 17,100 1 7.5 25,600 1 10.0 23,900 1 15.0 51,200 1 20.0 68,200
5 kW 7.5 kW 10 kW 15 kW 20 kW
kW
input
Btuh
Output
No of
StepskWinput
Btuh
Output
No of
StepskWinput
Btuh
Output
No of
StepskWinput
Btuh
Output
No of
StepskWinput
ELECTRICAL/ELECTRIC HEAT DATA
Model No. 15CHAXA−24 15CHAXA−30 15CHAXA−36 15CHAXA−42 15CHAXA−48 15CHAXA−60
Linevoltagedata − 60hz 1 phase 208/230V 208/230V 208/230V 208/230V 208/230V 208/230V
Compressor
Outdoor Fan
Motor
Indoor
Blower Motor
1
Maximum
Overcurrent
on
Electric
Heat &
Circuit
2
Minimum
Circuit
mpacity
Electric
Heat &
Circuit
NOTE − Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.
NOTE− Extremesofoperatingrangeareplusandminus10%oflinevoltage.
1 HACR type breaker or fuse.
2
RefertoNational or CanadianElectricalCodemanualtodeterminewire,fuseanddisconnectsizerequirements.
Rated Load Amps 13.4 14.1 14.1 17.9 21.8 26.4
Locked Rotor Amps 58 73 77 112 117 134
Full Load Amps 1.1 1.1 1.1 1.7 1.7 1.7
Locked Rotor Amps 2.2 2.2 2.2 4 4 4
Rated Load Amps 1.5 1.5 1.5 2.7 2.7 2.7
Locked Rotor Amps 3 3 4 5 5 5
Unit only, no electric heat 30 30 30 40 50 60
5 kW 35 35 35 35 35 35
ower
Motor
15 kW
7.5 kW 45 45 45 50 50 50
10 kW 60 60 60 60 60 60
Circuit 1 − − − − − − 60 60 60 60
Circuit 2 − − − − − − 30 30 30 30
20 kW
Circuit 1 − − − − − − − − − 60 60 60
Circuit 2 − − − − − − − − − 60 60 60
Unit only, no electric heat 21 22 22 29 34 39
5 kW 31.3 31.3 31.3 33.0 33.0 33.0
ower
Motor
15 kW
7.5 kW 44.3 44.3 44.3 46.1 46.1 46.1
10 kW 57.3 57.3 57.3 59.1 59.1 59.1
Circuit 1 − − − − − − 57.3 59.1 59.1 59.1
Circuit 2 − − − − − − 26.0 26.0 26.0 26.0
20 kW
Circuit 1 − − − − − − − − − 59.1 59.1 59.1
Circuit 2 − − − − − − − − − 52.1 52.1 52.1
Btuh
Output
Page 3
15CHAX PARTS ARRANGEMENT
TRANSFORMER
(T1)
BLOWER CONTROL
(A54)
FIGURE 1
15CHAX CONTROL BOX
CONTACTOR
SYSTEM OPERATION MONITOR
(A132)
(K1)
DUAL / FAN CAPACITOR
(C12)
FIGURE 2
Page 4
I−APPLICATION
15CHAX 2 through 5 ton (7.0 through 17.6kW) model units
are single phase air conditioning units designed for outdoor
installation on a slab or roof top.The units are available in two
cabinet sizes. Electric heat can be factory or field installed if
required. Refer to the Engineering Handbook for more specific application data.
II−UNIT COMPONENTS
15CHAX components are shown in figure 1. Control box components are shown in figure 2.
A−Control Box Components
1−Compressor Contactor K1
K1 is a 24VAC to line voltage s ingle pole double break contactor, which energizes the compressor in response to thermostat
demand.
2−Control Transformer T1
All 15CHAX series units use line voltage to 24VAC transformer
mounted in the control box. The transformer supplies power to
control circuits in the unit. Transformers use two primary voltage taps as shown in figure 3.
208 / 240 VOLT TRANSFORMER
PRIMARY
L2
240 VOLTS
208 VOLTS
L1
FIGURE 3
SECONDARY
24 VOLTS
3−Dual Capacitor C12
The compressor and condenser fan in the 15CHAX series
units use permanent split capacitor motors. The capacitor is located in the control box. A dual rated capacitor is used for both
the condenser fan motor and the compressor (see unit wiring
diagram per respective unit). The fan side and the compressor
side of the capacitor have different MFD ratings. See side of
capacitor for ratings.
4− Blower Control A15
!
WARNING
Electric shock hazard. Can cause injury or
death. Before attempting to perform any
service or maintenance, turn the electrical
power to unit OFF at disconnect switch(es).
Unit may have multiple power supplies.
15CHAX units are equipped with a variable speed motor
that is capable of maintaining a specified CFM throughout
the external static range. A particular CFM can be obtained
by positioning jumpers (COOL, HEAT, and ADJUST) on
the blower control board. The HEAT and COOL jumpers
are labeled A, B, C and D. Each of the numbers corresponds with an air volume (CFM) setting. The ADJUST
jumper is labeled Test, −, +, and Norm. The + and − pin settings are used to add or subtract a percentage of the CFM
selected. The Test jumper is used to operate the motor in
the test mode. See figure 4.
Factory settings for the blower speed jumpers are given in
the wiring diagram. Figure 4 shows the blower control
board. Use tables 1, 2 and 3 to determine the correct air volume for operation in heat and cool mode.
The CFM LED located on the blower control board flashes
one time per 100 cfm to indicate selected blower speed.
For example, if the unit is operating at 1000 CFM, CFM LED
will flash 10 times. If the CFM is 1150, CFM LED will flash 11
full times plus one fast or half flash.
At times the light may appear to flicker or glow. This takes
place when the control is communicating with the motor between cycles. This is normal operation.
Read through the jumper settings section before adjusting
the jumper to obtain the appropriate blower speed.
To change jumper positions, gently pull the jumper off the pins
and place it on the desired set of pins. The following section
outlines the different jumper selections available and conditions associated with each one. Refer to figure 4.
After the CFM for each application has been determined,
the jumper settings must be adjusted to reflect those given
in tables 1, 2 and 3. From the tables, determine which row
most closely matches the desired CFM. Once a specific row
has been chosen (+, NORMAL, or −), CFM volumes from
other rows cannot be used. Below are descriptions of the
jumper selections.
The variable speed motor slowly ramps up to and down
from the selected air flow during both cooling and heating
demand. This minimizes noise and eliminates the initial
blast of air when the blower is initially energized.
ADJUST
The ADJUST pins allow the motor to run at normal speed,
approximately 15 percent higher, or approximately 15 percent lower than normal speed. Tables 1, 2 and 3 give three
rows (+, NORMAL, and −) with their respective CFM volumes. Notice that the normal adjustment setting for cool
speed position D in table 1 is 900 CFM. The + adjustment
setting for that position is 1035 CFM and for the − adjustment setting is 765 CFM. After the adjustment setting has
been determined, choose the remaining speed settings
from those offered in the table in that row.
The TEST pin is available to bypass the blower control and
run the motor at approximately 70 percent to make sure that
the motor is operational. This is used mainly in troubleshooting. The G terminal must be energized for the motor to
run.
Page 5
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