LENNOX ML14XP1 Heat Pump Outdoor Units User Manual

LENNOX ML14XP1 Heat Pump Outdoor Units

Product Information

The ML14XP1 is a commercial heat pump outdoor unit designed for cooling and heating purposes. It has a SEER rating of up to 16.00 and an HSPF rating of up to 9.00.
The cooling capacity ranges from 3 to 5 tons, with a heating capacity of 32,400 to 58,500 Btuh. The model number for this unit is ML14XP1.

Some of the key features of this heat pump outdoor unit include:

• Outdoor Coil Fan
• QuantumTM Coil
• Expansion Valve – Outdoor Unit
• High Capacity Liquid Line Drier
• Four-Way Reversing Valve
• Scroll Compressor
• Defrost Control
• Heavy Gauge Steel Cabinet
• Refrigerant Line Access

Product Usage Instructions

When using this heat pump outdoor unit, please follow these instructions:

1. Ensure that the heat pump is installed with compatible indoor add-on coils.
2. If using the heat pump with a gas furnace, a dual-fuel compatible thermostat or zone control system with dual-fuel capabilities must be used (order separately).
3. The outdoor unit must be properly set, refrigerant lines connected, and electrical connections made by an installer to complete the installation.
4. Refer to the Installation Instructions for Indoor Unit Match-Up and Sub-Cooling Charge Levels to determine the correct amount of refrigerant charge required based on the outdoor unit size, indoor unit size, and refrigerant line length.
5. Optional accessories such as a Compressor Crankcase Heater, Low Ambient Kit, PermaGuardTM Unit Base, and Speed Control and Weatherproof Kit (for 208/230V models only) are available.
6. If a low ambient kit is installed on compressors, a Freezestat should also be installed.

MODEL NUMBER IDENTIFICATION

FEATURE HIGHLIGHTS

1. Outdoor Coil Fan
2. Quantum™ Coil
3. Expansion Valve – Outdoor Unit
4. High Capacity Liquid Line Drier
5. Four-Way Reversing Valve
6. Scroll Compressor
7. Defrost Control
8. Heavy Gauge Steel Cabinet
9. Refrigerant Line Access

APPROVALS AND WARRANTY

APPROVALS

• AHRI Standard 210/240 certified
• AHRI Certified system match-ups and expanded ratings, visit www.LennoxPros.com
• Sound rated to AHRI Standard 270-2008 test conditions
• Tested in Lennox’s Research Laboratory environmental test room environmental test room
• Rated According to U.S. Department of Energy (DOE) test procedures
• Unit and components ETL, NEC, and CEC bonded for grounding to meet safety standards for servicing
• ETL certified (U.S. and Canada)
• ISO 9001 Registered Manufacturing Quality System

WARRANTY

• Compressor – Limited five years
• All other covered components – Limited one year
• NOTE – Refer to Lennox® Basic Limited Warranty at www.Lennox.com for additional details.

FEATURES

APPLICATIONS

• 3 through 5 tons
• 208/230V or 460V-3ph models
• Sound levels low as 79 dBA
• Vertical air discharge
• Applicable to indoor air handlers or gas furnaces with indoor add-on coils
• Shipped completely factory assembled, piped and wired.
• NOTE – When heat pumps are used with gas furnaces, a dual-fuel compatible thermostat or zone control system with dual-fuel capabilities must be used (order separately).
• NOTE – Installer must set outdoor unit, connect refrigerant lines and make electrical connections to complete job.

REFRIGERATION SYSTEM

R-410A Refrigerant

• Non-chlorine, ozone-friendly
• Unit is factory pre-charged
• NOTE – Total system refrigerant charge is dependent on outdoor unit size, indoor unit size, and refrigerant line length.
• NOTE – Refer to Installation Instructions for “Indoor Unit Match-Up and Sub-Cooling Charge Levels” to determine the correct amount of charge required. Outdoor Coil Fan
• Direct drive fan
• Vertical air discharge
• Louvered steel top fan guard
• Totally enclosed fan motor
• Ball bearings
• Inherently protected

Quantum™ Coil

• Lennox designed and fabricated coil
• Enhanced aluminum alloy tube/enhanced fin coil
• Superior corrosion resistance
• Ripple-edged aluminum fins
• Aluminum tube construction
• Lanced fins for maximum fin surface exposure
• Fin collars grip tubing for maximum contact area
• Flared shoulder tubing connections
• Factory tested under high-pressure
• The entire coil is accessible for cleaning

Expansion Valve – Outdoor Unit

• Designed and sized for heat pump systems
• The sensing bulb senses evaporator suction temperature during the heating cycle High Pressure Switch
• Protects the system from high-pressure conditions
• Automatic reset

Low Pressure Switch

• Shuts off the unit if suction pressure falls below the setting
• Loss of charge and freeze-up protection
• Automatic reset

high Capacity Liquid Line Drier

• Factory installed in the liquid line
• Drier traps moisture or dirt
• 100% molecular-sieve, bead type, bi-flow drier

Four-Way Reversing Valve

• Rapid changeover of refrigerant flow direction from cooling to heating and vice versa
• Operates on the pressure differential between the outdoor unit and indoor coil
• Factory-installed

Optional Accessories

Check/Expansion Valve Kits

• Field-installed on certain indoor units
• See TXV Usage table
• Chatleff-style fitting

Freezestat

• Senses suction line temperature
• Cycles compressor off when suction line temperature falls below its setpoint
• Opens at 29°F and closes at 58°F
• Installs on or near the discharge line of the evaporator or on the suction line

Refrigerant Line Kits

• Refrigerant lines are shipped refrigeration clean
• Lines are cleaned, dried, pressurized, and sealed at the factory
• The suction line is fully insulated
• Lines are stubbed at both ends

COMPRESSOR

Scroll Compressor

• High efficiency with uniform suction flow
• Constant discharge flow, high volumetric efficiency, and quiet operation
• Low gas pulses during compression reduce operational sound levels
• The compressor motor is internally protected from excessive current and temperature
• A muffler in the discharge line reduces operating sound levels
• The compressor is installed in the unit on resilient rubber mounts for vibration-free operation

Scroll Compressor Operation

• Two involute spiral scrolls matched together generate a series of crescent-shaped gas pockets between them
• During compression, one scroll remains stationary while the other scroll orbits around it
• Gas is drawn into the outer pocket, the pocket is sealed as the scroll rotates
• As the spiral movement continues, gas pockets are pushed to the center of the scrolls. Volume between the pockets is simultaneously reduced
• When the pocket reaches the center, gas is now at high pressure and is forced out of a port located in the center of the fixed scrolls
• During compression, several pockets are compressed simultaneously resulting in a smooth continuous compression cycle
• Continuous flank contact, maintained by centrifugal force, minimizes gas leakage and maximizes efficiency
• Compressor is tolerant to the effects of slugging and contaminants. If this occurs, scrolls separate, allowing liquid or contaminants to be worked toward the center and discharged

Compressor Crankcase Heater

• Protects against refrigerant migration that can occur during low ambient operation

Optional Accessories

• Compressor Sound Cover
• Reinforced vinyl compressor cover
• 1-1/2 inch thick batt of fiberglass insulation
• Hook and loop fastening tape on all open edges

CONTROLS

Defrost Control

• Time/temperature defrost control
• Defrost cycle every 30, 60, or 90 minutes of compressor “on” time at outdoor coil temperatures below 42°F
• Factory setting – 90 minutes
• Anti-short cycle, timed-off control – 5 minutes
• Compressor delay – 30 seconds (field selectable) cycles the compressor in and out of defrost mode
• High and low-pressure switch monitoring (five-trip lockout)
• Two diagnostic LEDs were furnished for troubleshooting
• Conveniently located in the control box

Optional Accessories

• Compressor Low Ambient Cut-Off
• Non-adjustable switch (low ambient cut-out)
• Prevents compressor operation in cooling mode when the outdoor temperature is below 35°F

Indoor Blower Off Delay Relay Kit

• Delays indoor blower-off time during the cooling cycle Low Ambient Kit
• A heat pump can operate in the cooling mode down to 45°F outdoor air temperature without additional controls
• Two low ambient control options are available for field installation:

1. Low Ambient Control Kit (30°F)
2. Low Ambient Control (0°F)

• Requires Speed Control and Weatherproof Kit
• (ordered separately). Available for 208/230V models only.

NOTE – Freezestat should be installed on compressors equipped with a low ambient kit.
Mild Weather Kit

• Units can operate in the heating mode at outdoor air temperatures up to 75°F
• The field-installed kit allows heating operation above 75°F

Monitor Kit – Service Light

• Ambient compensating thermistor
• Service light thermostat
• For thermostats requiring indicator light inputs

Outdoor Thermostat Kit

• Outdoor thermostat locks out some of the electric heating elements on indoor units where two-stage control is applicable
• Outdoor thermostat maintains the heating load on low power input as long as possible before allowing the full power load to come on the line
• The Thermostat Kit and Mounting Box must be ordered separately

Thermostats

• For thermostat options, see Optional Conventional Temperature Control Systems.

CABINET

• Heavy gauge steel cabinet
• The five-station metal wash process
• Louvered heavy gauge steel panels
• Powder paint finish for superior rust and corrosion protection
• Control box conveniently located with all controls factory wired.
• The corner patch plate allows compressor access
• Drainage holes provided in the base section

PermaGuard™ Unit Base

• The durable zinc-coated base section resists rust and corrosion

Refrigerant Line Connections, Electrical Inlets, Service Valves

• Sweat connection vapor and liquid lines
• Located on the corner of the unit cabinet
• Fully serviceable brass service valves
• Vapor valve can be fully shut off, while the liquid valve may be front seated to manage refrigerant charge while servicing system
• Refrigerant line connections and field wiring inlets are located in one central area of cabinet for easy access
• See dimension drawing

Optional Accessories Unit Stand-Off Kit

• Black high-density polyethylene feet
• Raises unit off the mounting surface
• Four feet furnished per order number

SPECIFICATIONS

General Data| Model No. – 208/230V-3ph| ML14XP1-036-233| ML14XP1-042-233| ML14XP1-048-233| ML14XP1-060-233
---|---|---|---|---|---
Model No. – 460V-3ph| ML14XP1-036-463| ML14XP1-042-463| ML14XP1-048-463| ML14XP1-060-463
Nominal Tonnage| 3| 3.5| 4| 5
1 Sound Rating Number| 76| 79| 80| 80
Connections (sweat)| Liquid line o.d. – in.| 3/8| 3/8| 3/8| 3/8
Vapor line o.d. – in.| 7/8| 7/8| 7/8| 1-1/8
2 Refrigerant| R-410A charge furnished| 8 lbs. 10 oz.| 11 lbs. 14 oz.| 10 lbs. 7 oz.| 12 lbs. 11 oz.
Outdoor Coil| Net face area – sq. ft.| Outer coil| 21.0| 24.93| 24.93| 29.09
| Inner coil| 20.3| 24.13| 24.13| 28.16
Tube diameter – in.| 5/16| 5/16| 5/16| 5/16
No. of rows| 2| 2| 2| 2
Fins per inch| 22| 22| 22| 22
Outdoor Fan| Diameter – in.| 22| 26| 26| 26
No. of Blades| 3| 4| 4| 4
| | Motor hp| 1/6| 1/3| 1/3| 1/3
| | Cfm| 2870| 4347| 4347| 4500
| | Rpm| 839| 843| 843| 830
| | Watts| 205| 299| 299| 307
Shipping Data – lbs. 1 package| 229| 272| 273| 295
ELECTRICAL DATA
Line voltage data – 60 Hz – 3ph| | 208/230V| 460V| 208/230V| 460V| 208/230V| 460V| 208/230V| 460V
3 Maximum over| rent protection (MOC| P) amps| 20| 10| 30| 10| 30| 10| 30| 10
4 Minimum circuit| ampacity (MCA)| | 12.2| 7.7| 18.3| 8.2| 18.5| 8.5| 18.3| 8.6
Compressor| Rated Load Amps| 9.0| 5.8| 13.5| 6.0| 13.7| 6.2| 13.2| 6.3
| Locked Rotor Amps| 71| 38| 88| 44| 83.1| 41| 93| 55
| Power Factor| 0.8| 0.8| 0.84| 0.84| 0.91| 0.91| 0.97| 0.97
Outdoor Fan Motor| Full Load Amps| 1.0| 0.5| 1.8| 0.7| 1.8| 0.7| 1.8| 0.7
Locked Rotor Amps| 1.9| 1.2| 2.9| 2.5| 2.9| 2.5| 2.9| 2.5
OPTIONAL ACCESSORIES – ORDER SEPARATELY
Compressor Low Ambient Cut-Off| 45F08| •| •| •| •
Compressor Sound Cover| 18J42| •| •| •| •
Freezestat| 3/8 in. tubing| 93G35| •| •| •| •
| 5/8 in. tubing| 50A93| •| •| •| •
Indoor Blower Off Delay Relay| 58M81| •| •| •| •
5 Low Ambient Kit| (30°F)| 54M89| •| •| •| •
⁵ Low Ambient Control (0°F) 208/230V only| Speed Control| X5867| •| •| •| •
Weatherproof Kit| 56N41| •| •| •| •
Mild Weather Kit| | 11B97| •| •| •| •
Monitor Kit – Service Light| 76F53| •| •| •| •
Outdoor Thermostat Kit| Thermostat| 10Z23| •| •| •| •
Mounting Box| 31461| •| •| •| •
Refrigerant Line Sets

(Liq. x Suc. OD

| 3/8 x 7/8 x 3/8 – 30 ft.| 89J60|

•

|

•

|

•

|
3/8 x 7/8 x 3/8 – 40 ft.| 89J61
3/8 x 7/8 x 3/8 – 50 ft.| 89J62
x Insulation| 3/8 x 1-1/8 x 3/8 – 30 ft.| X0570| | | | •
Thickness – Length)| 3/8 x 1-1/8 x 3/8 – 50 ft.| 73P91
Unit Stand-Off Kit| | 94J45| •| •| •| •

NOTE – Extremes of operating range are plus 10% and minus 5% of line voltage.

1. Sfound Rating Number rated in accordance with test conditions included in AHRI Standard 270.
2. Refrigerant charge sufficient for 15 ft. length of refrigerant lines. For longer line set requirements see the Installation Instructions for information about line set length and additional refrigerant charge required.
3. HACR-type circuit breaker or fuse.
4. Refer to the National or Canadian Electrical Code manual to determine wire, fuse, and disconnect size requirements.
5. Freezestat is recommended with a Low Ambient Kit.

SOUND DATA

1 Unit Model

| Octave Band Sound Power Levels dBA, re 10 -12 Watts Center Frequency – HZ| 1 Sound Rating Number (dBA)| ² Estimated Sound Pressure Level at Distance From Unit (dBA at distance in ft.)
125| 250| 500| 1000| 2000| 4000| 8000| 3| 5| 10| 15| 50
036| 55.5| 66| 70.5| 70.5| 66.5| 61.5| 56| 76| 69| 64| 58| 55| 44
042| 63| 70.5| 74.5| 73| 70| 64| 56| 79| 72| 67| 61| 58| 47
048| 64| 72.5| 75.5| 73| 69.5| 63.5| 56| 80| 73| 68| 62| 59| 48
060| 61.5| 69| 73.5| 73.5| 70.5| 67| 62| 80| 73| 68| 62| 59| 48

NOTE – the octave sound power data does not include tonal correction.

1. Tested according to AHRI Standard 270-2008 test conditions.
2. Estimated sound pressure level at distance based on AHRI Standard 275-2010 method for equipment located on the ground, roof, or on the side of the building wall with no adjacent reflective surface within 9.8 feet.
3. Sound pressure levels will increase based on changes to assumptions. For other applications, refer to AHRI Standard 275.

INSTALLATION CLEARANCES

NOTES:

• Service clearance of 30 in. (762 mm) must be maintained on one of the sides adjacent to the control box.
• Clearance to one of the other three sides must be 36 in. (914mm)
• Clearance to one of the remaining two sides may be 12 in. (305mm) and the final side may be 6 in. (152 mm).
• A clearance of 24 in. must be maintained between two units. 48 in. (1219 mm) clearance is required on top of the unit.

DIMENSIONS

Model No.

| A| B| C
---|---|---|---
inches| mm| inches| mm| inches| mm
ML14XP1-036| 28-1/4| 718| 37-1/4| 946| 36-1/2| 927
ML14XP1-042| 32-1/4| 819| 37-1/4| 946| 36-1/2| 927
ML14XP1-048| 32-1/4| 819| 37-1/4| 946| 36-1/2| 927
ML14XP1-060| 32-1/4| 819| 43-1/4| 1099| 42-1/2| 1080

OPTIONAL CONVENTIONAL TEMPERATURE CONTROL SYSTEMS

CS7500 Commercial 7-Day Programmable Thermostat

• Four-Stage Heating / Three-Stage Cooling
• Universal Multi-Stage
• Intuitive Touchscreen Interface
• Automatic Changeover between Heating and Cooling
• Full Seven-Day Programming
• Four Time Periods Per Day
• Temperature and Humidity Control
• One-Touch Away Mode
• Holiday Scheduling
• Smooth Setback Recovery (SSR)
• Performance Reports
• Notifications/Reminders
• Dehumidification Control for Split Systems and Rooftop Units
• Economizer Relay Control
• Backlit Display
• Wallplate Furnished
• FDD, ASHRAE and IECC-compliant

CS3000 Commercial 5-2 Day Programmable Thermostat

• Two-Stage Heating / Two-Stage Cooling
• Conventional Systems
• Intuitive Interface
• 5-2 Day Programming
• Program Hold
• Remote Indoor Temperature Sensing
• Smooth Setback Recovery (SSR)
• Economizer Relay Control
• Maintenance/Filter/Service Reminders
• Backlit Display
• Wallplate Furnished
• Simple Up and Down Temperature Control

**OPTIONAL L CONVENTIONAL L TEMPERATUR E CONTRO L SYSTEMS **

Description| | Catalog No.
**CS7500 Commercial 7-Day Programmable Thermostat
CS7500 7-Day Thermostat| 22K41
Sensors/Accessories| ² Remote non-adjustable wall-mount 20k| 47W36
| ² Remote non-adjustable wall-mount 10k| 47W37
| Remote non-adjustable discharge air (duct mount)| 19L22
| Outdoor temperature sensor| X2658
****CS3000 Commercial 5-2 Day Programmable Thermostat
CS3000 5-2 Day Thermostat| 11Y05
Sensors/Accessories| Remote non-adjustable wall mount 10k averaging| 47W37
| The thermostat wall mounting plate| X2659
****Universal Thermostat Guard with Lock (clear)
| Inside Dimensions (H x W) 5 7/8 x 8 3/8 in.| 39P21**
1 Up to nine of the same type of remote temperature sensors can be connected in parallel.

2 Remote wall-mount sensors can be applied in any of the following combinations:

|

1. Up to nine of the same type of remote temperature sensors can be connected in parallel.
2. Remote wall-mount sensors can be applied in any of the following combinations:

• One Sensor – (1) 47W36, Two Sensors – (2) 47W37, Three Sensors – (2) 47W36 and (1) 47W37
• Four Sensors – (4) 47W36, Five Sensors – (3) 47W36 and (2) 47W37

TXV USAGE

Use this table for C35, CH23 and CR33 Field Installed TXV Match-Ups.

• CX35 and CHX35 coils and all Lennox air handlers are shipped with a factory-installed TXV.
• C35 coils – Replace the factory-installed RFC orifice with the expansion valve listed.
• CH23 and CR33 – Use the expansion valve listed.

AHRI STANDARD 210/240

• Cooling or heating capacities are net values, including the effects of blower motor heat, and do not include supplementary heat. Power input is the total power input to the compressor(s) and fan(s), plus any controls and other items required as part of the system for normal operation.
• Units that do not have an indoor air-circulating blower furnished as part of the model, i.e., split system with indoor coil only, are established by subtracting from the total cooling capacity 1250 Btu/h per 1,000 cfm, and by adding the same amount to the heating capacity. Total power input for both heating and cooling is increased by 365 W per 1,000 cfm of indoor air circulated.

TXV SUBSTITUTION

• A general guide for replacing the factory-installed TXV if the indoor unit (coil/air handler) is larger or smaller than the outdoor unit.

Outdoor Unit| Indoor Unit| TXV

Furnished

| TXV

Replacement

---|---|---|---
Size| Tons| Size| Tons
036| 3| 24| 2| 12J18| 12J19
036| 3| 30| 2.5| 12J18| 12J19
042| 3.5| 24| 2| 12J18| 12J20
042| 3.5| 30| 2.5| 12J18| 12J20
042| 3.5| 30/36| 3| 12J19| 12J20
042| 3.5| 36| 3| 12J19| 12J20
048| 4| 30/36| 2.5/3| 12J19| 12J20
048| 4| 36| 3| 12J19| 12J20

TXV Ranges:

• 12J18 – 1.5 to 2.5 ton systems – Use on 2.5 ton (030) and lower systems.
• 12J19 – 3-ton systems – Use down to 2-ton (024) systems.
• 12J20 – 3.5 to 5 ton systems – Use down to 3 ton (036) systems.

REVISIONS

Sections| Description of Change
Optional Conventional Temperature Control Systems| Removed obsolete thermostat models.

• Visit us atwww.Lennox.com
• For the latest technical information,www.LennoxCommercial.com
• Contact us at 1-800-4-LENNOX

NOTE – Due to Lennox’s ongoing commitment to quality, Specifications, Ratings, and Dimensions are subject to change without notice and without incurring liability.
Improper installation, adjustment, alteration, service, or maintenance can cause property damage or personal injury.
Installation and service must be performed by a qualified installer and servicing agency.

References

• Lennox
• Commercial Air Conditioning & Heating Units | Lennox Commercial

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