Lennox ELKP Series Service Literature

Service Literature
The EL072KP (6 ton / 21.1 kW), EL090KP (7.5 ton / 26.4
kW), and EL120KP (10 ton / 35.2 kW) heat pump units are
designed for R-454B, light commercial applications, with a
remotely located blower-coil unit or a furnace with an add-
on evaporator coil. ELKP model units are equipped with
one dual speed scroll compressor. The ELKP heat pumps
match with the ELKA blower-coil units. ELKP units are all
three-phase.
NOTE - The ELKP is a PARTIAL UNIT AIR CONDITION­
ER, complying with PARTIAL UNIT requirements in this
standard, and must only be connected to other units that
have been confirmed as complying to corresponding PAR­
TIAL UNIT requirements of this Standard, UL 60335­2­40/
CSA C22.2 No. 60335­2­40, or UL 1995/CSA C22.2 No
236.
This manual is divided into sections which discuss the ma-
jor components, refrigerant system, charging procedure,
maintenance and operation sequence.
Information in this manual is intended for qualified service
technicians only. All specifications are subject to change.
Procedures in this manual are presented as recommen-
dations only and do not supersede or replace local or
state codes.
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 licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
WARNING
Electric shock hazard! - Disconnect all power
supplies before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
UNIT INFORMATION
100198
3/2025
ELKP SERIES HEAT PUMP UNITS
Page 1

Table of Contents

Model Identification ........................................................5
SPECIFICATIONS ..........................................................6
Unit Plumbing Parts Arrangement .................................8
I-UNIT COMPONENTS ..................................................9
A-Control Box Components ...........................................9
II- REFRIGERANT SYSTEM ....................................... 11
A- Lineset .................................................................... 11
B-Service Valves .........................................................12
III-START-UP ................................................................13
IV-CHARGING .............................................................14
A-Leak Testing .............................................................14
B-Evacuating the System ............................................15
C- Refrigerant Charge ..................................................16
V- SEQUENCE OF OPERATION ................................16
VI- MAINTENANCE ......................................................17
VII- WIRING DIAGRAM AND SEQUENCE OF OPERA-
TION .............................................................................18
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
IMPORTANT
This unit must be matched with an indoor coil as
specified with AHRI. For AHRI Certified system match-
ups and expanded ratings, visit www.LennoxPros.com.
ELKP
6, 7.5 & 10 TON