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INSTALLATION AND MAINTENANCE INSTRUCTIONS
The equipment covered in this manual is to be installed by trained and experienced service
and installation technicians. Improper installation, modification, service, or use can cause
electrical shock, fire, explosion, or other conditions which may cause personal injury, death,
or property damage. Use appropriate safety gear including safety glasses and gloves
when installing this equipment.
WARNING
Risk of electrical shock. Disconnect all remote power
supplies before installing or servicing any portion of the
system. Failure to disconnect power supplies can result
in property damage, personal injury, or death.
WARNING
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and qualified
service personnel should install or service this equipment.
Installation and service performed by unqualified persons
can result in property damage, personal injury, or death.
WARNING
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
506470-01
4HP18LT Series
Split System Heat Pump
Save these instructions for future reference
WARNING
Issue 1007
TABLE OF CONTENTS
INSTALLATION .................................................... 2
CONNECTION DIAGRAM .................................... 4
START-UP .......................................................... 13
OPERATION ...................................................... 18
MAINTENANCE ................................................. 23
Manufactured By
Allied Air Enterprises, Inc.
A Lennox International Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
*506470-01*
Page 1
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Summary of Contents for Lennox 4HP18LT Series
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Page 1: Table Of Contents
Installation and service performed by unqualified persons Manufactured By can result in property damage, personal injury, or death. Allied Air Enterprises, Inc. A Lennox International Inc. Company 215 Metropolitan Drive West Columbia, SC 29170 WARNING *506470-01* Sharp metal edges can cause injury. -
Page 2: Installation
The unit must be positioned to give adequate clearances for sufficient airflow and servicing. 4HP18LT condensing units use R410A which is an ozone- Refer to Figure 1 for installation clearances. friendly HFC refrigerant. The unit must be installed with a matching indoor coil and line set. - Page 3 • Install the unit high enough above the ground or roof to If unit coil cannot be mounted away from prevailing winter allow adequate drainage of defrost water and prevent winds, a wind barrier should be constructed (See Figure 3). ice buildup.
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Page 4: Connection Diagram
Refrigerant Piping If the 4HP18LT unit is being installed with a new indoor coil and line set, the refrigerant connections should be made as outlined in this section. If an existing line set and/or indoor coil will be used to complete the system, refer to this section as well as the section that follows entitled - Flushing Existing Line Set and Indoor Coil. - Page 5 Placement Brazing Connection Procedure Be aware that some localities are adopting sound ordinances 1. Cut ends of refrigerant lines square (free from nicks or based on how noisy the unit is at the neighbor’s home, not dents). Debur the ends. The pipe must remain round; do at the original installation.
- Page 6 6. Braze the line set to the service valve. Quench the joints with water or a wet cloth to prevent heat damage to the CAUTION valve core and opening port. The tube end must stay When flushing existing line set and/or indoor coil, be sure to bottomed in the fitting during final assembly to ensure empty all existing traps.
- Page 7 Refrigerant Line Sets: Transition from Vertical to Horizontal Automotive Anchored Muffler-Type Heavy Nylon Hanger Wire Tie Strap Liquid Strap Liquid Line to Vapor Line to Vapor Line Wall Wall Line Stud Stud Liquid Line Liquid Line – Vapor Line Wrapped –...
- Page 8 Flushing Existing Line Set and Indoor Coil from the existing system. Refer to the gauges after shutdown to confirm that the entire system is completely void of This procedure should not be performed on systems refrigerant. Disconnect the liquid and suction lines from the which contain contaminants, such as compressor burn existing outdoor unit.
- Page 9 11. Do not twist cap tubes when loosening the seal nut from the orifice housing. Use wrench to back up the distributor. 5. Remove the pressure tap valve cores from the 4HP18LT units service valves. Connect an R-22 cylinder with clean refrigerant to the suction service valve.
- Page 10 3. Connect the external equalizer line to the equalizer port Suction Line (Ball Type) Service Valve on the suction line and tighten to 8 ft.lbs. Suction line (ball type) service valves function the same way as the other valves; the difference is in the construction (See 4.
- Page 11 3. Open the high pressure side of the manifold to allow R410A into the line set and indoor unit. Weigh in a trace amount of R410A. (A trace amount is a maximum of 2 oz. of refrigerant or 3 lbs. pressure.) Close the valve on the R410A cylinder and the valve on the high pressure side of the manifold gauge set.
- Page 12 4. Open both manifold valves and start vacuum pump. 5. Evacuate the line set and indoor unit to a minimum of 500 microns or lower. During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure.
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Page 13: Start-Up
START-UP Units are factory charged with the amount of R410A refrigerant indicated on the unit rating plate. This charge is based on a matching indoor coil and outdoor coil with 15’ CAUTION line set. For varying lengths of line set, refer to Table 4 for If unit is equipped with a crankcase heater, it should be refrigerant charge adjustment. - Page 14 Figure 13 1. Connect the manifold gauge set to the service valve ports 2. Conduct a leak check, then evacuate as previously as follows (See Figure 13 above): outlined. 3. Weigh in the charge according to the total amount shown •...
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Page 15: Subcooling Values
R410A Temperature/Pressure Chart T e m p . P re s s u re T e m p . P re s s u re T e m p . P re s s u re P s ig P s ig P s ig 1 0 0 .8 2 1 4 .0... - Page 16 ° Liquid Line Temperature °F ° Outdoor Ambient Temperature °F ° Approach Temperature °F 6. Compare the approach value with those shown in Table 9. If the values do not agree with those provided in Table 8, add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature.
- Page 17 L - Liquid S- Suction Values provided above are typical pressures. Indoor unit matchup, indoor air quality equipment, and indoor load will case pressures to vary. Table 8 506470-01 Issue 1007 Page 17...
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Page 18: Operation
OPERATION Emergency heat is usually used during an outdoor shutdown, but it should also be used following a power outage if power has been off for over an hour and the outdoor temperature Outdoor unit and indoor blower cycle on demand from the is below 50°F. - Page 19 Defrost Control Timing Pins locked out until power to the board is interrupted, then re- Each timing pin selection provides a different accumulated established, or until the jumper is applied to the TEST pins compressor run time period during one thermostat run cycle. for 0.5 seconds.
- Page 20 System Diagnostic Module TRIP LED (Red) indicates there is a demand signal from 4HP18LT units contain a diagnostic module for the thermostat but no current to the compressor is detected troubleshouting heat pump system failures. By monitoring by the module. The TRIP LED typically indicates the...
- Page 21 Every time the module powers up, the last ALERT LED flash 24VAC Power Wiring code that occurred prior to shutdown is displayed for The diagnostic module requires a constant nominal 24VAC 60 seconds. The module will continue to display the previous power supply.
- Page 22 Thermostat Demand Wiring Miswired Module Codes The diagnostic module requires a thermostat demand signal Depending on the system configuration, some ALERT flash to operate properly. The thermostat demand signal input, codes may not be active. The presence of safety switches labeled Y on the module, should always be connected to affects how the system alerts are displayed by the module.
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Page 23: Maintenance
MAINTENANCE WARNING Before performing maintenance operations on system, turn the electric power to unit OFF at disconnect switch(es). Unit may have multiple power supplies. Electrical shock could cause personal injury or death. Before the start of each heating and cooling season, the following service checks should be performed by a qualified service technician. - Page 24 HOMEOWNER INFORMATION more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (such as pet urine, cottonwood seeds, etc...). In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow Heat Pump Operation prevent your unit from operating at its most efficient level.
- Page 25 Fan Switch Preservice Check In AUTO or INT (intermittent) mode, the blower operates If your system fails to operate, check the following before only when the thermostat calls for heating or cooling. This calling for service: mode is generally preferred when humidity control is a priority. The ON or CONT mode provides continuous indoor blower Check to see that all electrical disconnect switches ar ON.
- Page 26 Start-Up and Performance Checklist Job Name _____________________________ Job No. ____________ Date ___________ Job Location ___________________________ City _______________ State ___________ Installer _______________________________ City _______________ State ___________ Unit Model No. _________________________ Serial No._____________________________ Service Technician _______________________ Nameplate Voltage _____________________ Rated Load Ampacity _________ Compressor Amperage ________ Outdoor Fan __________ Maximum Fuse or Circuit Breaker ________________________...
- Page 27 Wire Diagram LT BLUE OUTDOOR BLUE YELLOW BLACK DUAL CAPACITOR THERMOSTAT GREEN BLACK O-OUT LO-PS YELLOW COMMON BLUE Y1 OUT BLACK HI-PS DEFROST CONTROL COMPRESSOR A132 YELLOW CRANKCASE HEATER 208-230/60/1 GROUND GROUND THERMOSTAT CMC1 Y1 Y2 REVERSING VALVE O-OUT DEFROST THERMOSTAT LO-PS BLACK...
- Page 28 NOTES 506470-01 Issue 1007 Page 28...