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Service Literature
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 out-
door residential use only. Units can be installed at ground
level or rooftop applications. Optional field installed supple-
mental 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 sub-
ject to change. Procedures outlined in this manual are pre-
sented 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.
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.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal-
lation 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 electro-
static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
Corp. 0634−L6
15CHAX SERIES UNITS
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.
VII Wiring Diagrams
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15CHAX
2 to 5 Ton (7.0 to 17.6 kW)
WARNING
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© 2006 Lennox Industries Inc.
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Litho U.S.A.
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Summary of Contents for Lennox 15CHAX
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Page 1: Table Of Contents
Corp. 0634−L6 Service Literature 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 out- door residential use only. Units can be installed at ground level or rooftop applications. -
Page 2: Table Of Contents Specifications / Accessories
SPECIFICATIONS General 15CHAXA 15CHAXA 15CHAXA 15CHAXA 15CHAXA 15CHAXA Model No. Data −24 −30 −36 −42 −48 −60 Nominal Tonnage Cooling Total cooling capacity − Btuh 23,000 28,200 35,000 41,500 47,500 59,000 Performance Total unit watts 1850 2275 2820 3350 4030 5040 SEER (Btuh/Watt) 14.50... -
Page 3: Electric Heat Capacities
ELECTRIC HEAT CAPACITIES 5 kW 7.5 kW 10 kW 15 kW 20 kW Input Input Voltage No of Btuh No of Btuh No of Btuh No of Btuh No of Btuh Steps input Output Steps input Output Steps input Output Steps input Output... -
Page 4: Parts Arrangement
15CHAX PARTS ARRANGEMENT FIGURE 1 15CHAX CONTROL BOX SYSTEM OPERATION MONITOR (A132) CONTACTOR TRANSFORMER (K1) (T1) DUAL / FAN CAPACITOR (C12) BLOWER CONTROL (A54) FIGURE 2 Page 4... -
Page 5: I Application
15CHAX units are equipped with a variable speed motor I−APPLICATION that is capable of maintaining a specified CFM throughout 15CHAX 2 through 5 ton (7.0 through 17.6kW) model units the external static range. A particular CFM can be obtained are single phase air conditioning units designed for outdoor by positioning jumpers (COOL, HEAT, and ADJUST) on installation on a slab or roof top.The units are available in two... - Page 6 BLOWER CONTROL BOARD (A54) ADJUST 16−PIN PLUG SELECTOR PINS (BOARD TO MOTOR) (Setting affects both heating and cooling modes) HEATING SPEED DIAGNOSTIC SELECTOR PINS COOLING SPEED SELECTOR PINS FIGURE 4 COOL CONTINUOUS FAN The COOL jumper is used to determine the CFM during When the thermostat is set for Continuous Fan"...
- Page 7 The Lennox system operation monitor (LSOM) detects then repeats the process. This consecutive flashing cor- the most common fault conditions in the air conditioning responds with a particular abnormal condition.
- Page 8 TABLE 4 System Operation Monitor LED Troubleshooting Codes Status LED Condition Status LED Description Status LED Troubleshooting Information Green Power" LED ON Module has power 24VAC control power is present at the module terminal. Determine/verify that both R and C module terminals are connected and Green Power"...
- Page 9 24 VAC or VDC signal) from optional controls D.C. brushless motor (controller converts single phase a.c. to such as the Harmony zone control system, Lennox Signatu- three phase D.C.), with a permanent-magnet-type rotor (fig- reStatt or a conventional thermostat.
- Page 10 Figure 8 shows the two quick-connect jacks (J48 and J49) fore attempting any service, make sure the indoor unit is caus- which connect the motor to the 15CHAX. Jack J48 is the ing the interference. To check, disconnect power to indoor unit power plug and jack J49 connects the unit controls to the then check TV for continued signs of interference.
- Page 11 VARIABLE SPEED CHECKOUT Using the transformer in the unit, test motor operation by jumping 24 volts into the terminals illustrated below for the desired speed. HEATING SPEED LOW (continuous blower) SPEED 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 To Y"...
- Page 12 If the compressor is replaced, con- NOTE − The head of a scroll compressor may be hot since it is in constant contact with discharge gas. ventional Lennox cleanup practices must be used. SUCTION INTERMEDIATE PRESSURE...
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Page 13: Electric Heat
S4 is a N.C. auto−reset high pressure switch located on the liquid line. The switch shuts off the compressor when liquid pressure rises above the factory setting. The switch on 15CHAX units is set to open at 590 + 10 psi and close at TB 2 PRIMARY 418 + 10 psi. -
Page 14: Charging
Allow unit operation to stabilize before taking pressure accordingly for maximum performance. readings. TABLE 6 Subcooling Values 82_F OD / 80_F IDDB Unit Model No. / 67_F IDWB 15CHAX−24 15CHAX−30 15CHAX−36 15CHAX−42 15CHAX−48 15CHAX−60 Table 7 Normal Operating Pressures 80°F db / 67°F wb RETURN AIR... - Page 15 VI−Wiring Diagram and Sequence of Operation A−Unit Diagram Page 15...
- Page 16 B−PHK Electric Heat Page 16...