Lennox 14HPX Unit Information
1.5 to 5 ton 14hpx series residential split-system heat pump unit
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Also See for 14HPX:
- Installation instructions manual (36 pages) ,
- Brochure & specs (2 pages) ,
- Installation and service procedure (52 pages)
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Service Literature
The 14HPX is a residential split-system heat pump. The
series is designed for use with expansion valves (TXV) and
HFC−410A refrigerant. All 14HPX units utilize scroll compres-
sors.
14HPX series units are available in 1−1/2, 2, 2 -1/2, 3, 3
-1/2, 4 and 5 ton capacities. All major components (indoor
blower and coil) must be matched according to Lennox rec-
ommendations for the compressor to be covered under
warranty. Refer to the Engineering Handbook for approved
system matchups.
This manual is divided into sections which discuss the
major components, refrigerant system, charging proce-
dure, maintenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are subject
to change.
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.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in person-
al injury or death.
Corp. 0719−L5
Revised 06−2008
14HPX SERIES UNITS
In order to avoid injury, take proper precaution when
lifting heavy objects.
Specifications / Electrical Data
I Unit Components
II Refrigerant System
III Charging
IV Maintenance
V Diagrams
Page 1
14HPX
1.5 to 5 ton
CAUTION
Table of Contents
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© 2007 Lennox Industries Inc.
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Related Manuals for Lennox 14HPX
Summary of Contents for Lennox 14HPX
- Page 1 HFC−410A refrigerant. All 14HPX units utilize scroll compres- sors. 14HPX series units are available in 1−1/2, 2, 2 -1/2, 3, 3 -1/2, 4 and 5 ton capacities. All major components (indoor blower and coil) must be matched according to Lennox rec- ommendations for the compressor to be covered under warranty.
- Page 2 Refrigerant charge sufficient for 15 ft. length of refrigerant lines. HACR type circuit breaker or fuse. Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Crankcase Heater and Freezestat are recommended with Low Ambient Kit. 14HPX−036 not available in Canada. Page 2...
- Page 3 SPECIFICATIONS General Model No. 14HPX−042 14HPX−048 14HPX−060 Data Nominal Tonnage Sound Rating Number Liquid line o.d. − in. Connections (sweat) Vapor line o.d. − in. 1-1/8 Refrigerant HFC−410A charge furnished 12 lbs. 7 oz. 12 lbs. 10 oz. 16 lbs. 0 oz.
- Page 4 I − UNIT COMPONENTS A − Control Box (Figure 2) Unit components are illustrated in figure 1. 14HPX units are not equipped with a 24V transformer. All 24 VAC controls are powered by the indoor unit. Refer to 14HPX UNIT COMPONENTS wiring diagram.
- Page 5 1 & 2 NOTE − Component Locations Vary by Board Manufacturer. applicable) (176) (Yellow) Y2 not used on 14HPX FIGURE 4 Note: Sensor resistance decreases as sensed temperature increases (see figure5). Defrost Control Pressure Switch Connections The unit’s automatic reset pressure switches (LO PS − S87 NOTE −...
- Page 6 Ambient and Coil Sensor 5750 7450 9275 11775 15425 19975 26200 34375 46275 62700 85300 10000 30000 50000 70000 90000 RESISTANCE (OHMS) FIGURE 5 AMBIENT SENSOR COIL SENSOR − Clip coil temperature sensor from the de- frost board on the bend shown − 6th bend up.
- Page 7 NOTE − The 30 second off cycle is NOT functional when Calibration success depends on stable system tempera- jumpering the TEST pins. tures during the 20−minute calibration period. If the control fails to calibrate, another defrost cycle will be initiated after Operational Description 45 minutes (90 minutes −1 to −4 boards) of heating mode The defrost control has three basic operational modes:...
- Page 8 Y1 Active ( 0" line inactive) Short test pins for longer Short test pins for more than 2 seconds than 1 second but less than 2 seconds Clear any short cycle lockout and 5 strike fault lockout function, if applicable. Clear any short cycle lockout If in COOLING Mode If in HEATING Mode...
- Page 9 Calibration Mode Sequence Occurs after power up, after cooling operation, or if the coil temperature exceeds the termination temperature while in Heat Mode. DCB defaults to 34 minutes Time/Temperature Mode Reset Compressor Runtime / Reset Three / Five Strike Counter 45 MIN.
- Page 10 TABLE 2 Green Condition/Code Possible Cause(s) Solution Power problem No power (24V) to control termi- Check control transformer power (24V). nals R & C or board failure. If power is available to board and LED(s) do not light, replace board. Simultaneous Normal operation Unit operating normally or in...
- Page 11 B − Compressor (B1) CROSS−SECTION OF SCROLLS All 14HPX units utilize a scroll compressor. The scroll com- DISCHARGE STATIONARY SCROLL pressor design is simple, efficient and requires few moving DISCHARGE PRESSURE parts. A cutaway diagram of the scroll compressor is shown in figure 9.
- Page 12 See figure 13. The outdoor fan motor is removed from the fan guard by removing the four nuts found on the top panel. If replacing outdoor fan motor on the 14HPX−060, align motor shaft 1/4" from the hub. For all ALIGN FAN HUB FLUSH WITH other 14HPX model units, motor shaft should be flush MOTOR SHAFT.
- Page 13 E − High Pressure Switch (S4) I − Drier A filter drier designed for all 14HPX model units is factory IMPORTANT installed in the liquid line. The filter drier is designed to re- move moisture and foreign matter, which can lead to com- Pressure switch settings for R−410A refrigerant will...
- Page 14 II − REFRIGERANT SYSTEM 14HPX COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS) OUTDOOR UNIT DISTRIBUTOR REVERSING VALVE EXPANSION/CHECK VALVE BIFLOW OUTDOOR FILTER / DRIER COIL HIGH INDOOR UNIT PRESSURE PRESSURE MUFFLER GAUGE MANIFOLD SUCTION SERVICE VAPOR PORT LINE LIQUID LINE VALVE HFC−410A...
- Page 15 Field refrigerant piping consists of liquid and vapor lines Do not attempt to backseat this valve. Attempts to from the outdoor unit (sweat connections). Use Lennox backseat this valve will cause snap ring to explode L15 (sweat) series line sets as shown in table 4.
- Page 16 NOTE-The preferred method is to use an electronic leak or Halide detector. Add a small amount of HFC−410A (3 to 5 A ball-type full service valve is used on 14HPX. Valves psig [20kPa to 34kPa]) then pressurize with nitrogen to 150 are not rebuildable.
- Page 17 line at manifold. Break vacuum in system with nitro- NOTE − Be sure that filters and indoor and outdoor coils are gen pressure by opening manifold high pressure clean before testing. valve. Close manifold high pressure valve to center Cooling mode indoor airflow check port.
- Page 18 Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system. Table 5 Normal Operating Pressures − Liquid +10 & Vapor +5 PSIG* 14HPX−018 14HPX−024 14HPX−030 14HPX−036 14HPX−042...
- Page 19 3 ounce per 5 ft. (85g per 1.5m) Adding Charge for Indoor Matchups Table 7 lists all the Lennox recommended indoor unit matchups along with NOTE − *If line length is greater than 15 ft. (4.6 m), add this amount.
- Page 20 CX34−25A/B CH33−48B CR33−60D CX34−31A/B CR33−50/60C CBX33−048, −060 CX34−36A/B/C CR33−48B/C CX34−62C, −62D CX34−38A/B CX34−49C CX34−49D 14HPX−030 CX34−43B/C, −50/60C CX34−60D 14HPX−060 CH23−41 CX34−38A/B, −44/48C 14HPX−042 CH23−51 CH23−68 CBX26UH−024 CH23−68 CBX26UH−048 CBX26UH−030 CBX26UH−042 CBX26UH−060 CBX27UH−030 CBX27UH−042 CBX27UH−060 CBX32M−030 CBX32M−048 CBX32M−048, −060 CBX32M−036 CBX32MV−048 CBX32MV−048, −060...
- Page 21 TABLE 8 . HFC−410A Temp. (°F) − Pressure (Psig) °F Psig °F Psig °F Psig °F Psig 100.8 178.5 290.8 445.9 102.9 181.6 295.1 451.8 105.0 184.3 299.4 457.6 107.1 187.7 303.8 463.5 109.2 190.9 308.2 469.5 111.4 194.1 312.7 475.6 113.6 197.3...
- Page 22 OFF at dis- 1. Clean or change filters. connect switch(es). Unit may have 2. Lennox blower motors are prelubricated and permanent- multiple power supplies. ly sealed. No more lubrication is needed. Maintenance and service must be performed by a qualified 3.
- Page 23 V − WIRING DIAGRAM AND SEQUENCE OF OPERATION 14HPX UNIT DIAGRAM Page 23...
- Page 24 14HPX OPERATING SEQUENCE This is the sequence of operation for 14HPX series FIRST STAGE HEAT: units. The sequence is outlined by numbered steps Internal thermostat wiring de−energizes terminal O by which correspond to circled numbers on the adjacent heating mode selection, de−energizing the reversing valve diagram.