CK40HT

Horizontal | Cased | Quantum™ Coil | TXV Furnished | R-410A / R-454B RESIDENTIAL PRODUCT SPECIFICATIONS (EHB)

INDOOR COILS 1.5 to 5 Tons

NOTE - Coils are furnished with a factory installed R-410A expansion valve. As an option, a R-454B expansion valve may be substituted. See page 5.

NOTE - See R-454B Refrigerant Conversion Table on page 5 for additional components required for conversion.

Model Number Identification

The model number CK40HT-36A-01 is structured as follows:

Unit Type: C = Indoor Coil
Series: 40 = Quantum™ Coil
Cabinet: H = Horizontal Cased
Metering Device: T = Factory installed Check/Expansion Valve for R-410A refrigerant (non-bleed port)
Refrigerant Compatibility: K = R-454B Compatible
Revision Level: 01 = R-410A TXV installed
Cabinet Width: A = 14-1/2 in., B = 17-1/2 in., C = 21 in., D = 24-1/2 in.
Nominal Cooling Capacity: 18 = 1.5 tons, 24 = 2 tons, 30 = 2.5 tons, 36 = 3 tons, 42 = 3.5 tons, 48 = 4 tons, 49 = 4 tons, 51/61 = 4/5 tons, 60 = 5 tons

Note: Furnaces with the same letter designation physically match the indoor coil.

Approvals and Warranty

Approvals

Tested with matching air conditioners and heat pump units in the Lennox Research Laboratory environmental test room in accordance with AHRI Standard 210/240-2023.
AHRI Certified system match-ups and expanded ratings available at www.LennoxPros.com.
Air resistance tests conducted by Lennox Laboratory air test chamber.

NOTE: Coils can be field configured for use with R-454B refrigerant during the initial installation only. Coils may not be modified after initial installation.

Warranty

All other covered components:
Limited five years in residential installations.
Limited one year in non-residential installations.

NOTE: Refer to Lennox® Basic Limited Warranty at www.Lennox.com for additional details.

Features

Applications

1.5 to 5 ton nominal sizes.
Lennox designed horizontal indoor coils are easily installed with most Lennox horizontal furnaces.
Factory installed R-410A check/expansion valve.

NOTE: Coils can be field converted for use with R-454B refrigerant.

Coil Construction (Quantum™ Coil)

Lennox designed and fabricated coil.
Aluminum tubing, hairpins, distributor, and header tubes.
Copper refrigerant sweat connections on both liquid and suction lines for easy brazing.
Ripple-edged aluminum fins.
Lanced fins provide maximum exposure of fin surface to air stream.
Helical grooved tubing provides superior heat transfer.
Twin coil construction assembled in an "A" configuration for large surface area.
High pressure testing ensures leak-proof construction.

Refrigerant Line Connections

Copper refrigerant sweat connections on both liquid and suction lines for easy brazing.
Lines extend outside of the cabinet for ease of connection.
See dimension drawings for locations.

Anti-Microbial Drain Pan

Non-corrosive, UV-resistant polymer drain pan with dual FPT drain connections.
Anti-Microbial additive resists growth of mold and mildew on the drain pan, improving indoor air quality and reducing drain line blockage.

R-410A Check and Expansion Valve

For use with R-410A systems.
Wide range valve with Chatleff style fitting.
Factory installed on all models.

R-454B Refrigerant Conversion

Additional Components are required for conversion to R-454B Refrigerant:

Refrigerant Detection System (RDS) Coil Sensor Kit
Refrigerant Detection System (RDS) Blower Control Board Kit
R-454B Check and Expansion Valve

Optional Accessories

Refrigerant Detection System (RDS) Coil Sensor Kit

Complies with UL 60335-2-40 approved standard.
Required for all systems using R-454B refrigerant.
Consists of Refrigerant Detection System (RDS) sensor, lineset sleeves, mounting brackets, and A2L labeling.
Sensor ensures safe operation for systems equipped with R-454B refrigerant.
Indoor sensor detects any refrigerant leaks.
See R-454B Refrigerant Conversion Table on page 5.

Refrigerant Detection System (RDS) Blower Control Board

Communicating Blower Control Board (Universal): Can be used universally with any Lennox® communicating furnace or any non-communicating 24 volt furnace.
Non-Communicating Blower Control Board: Can be used with any non-communicating 24 volt furnace.

Standard Features (RDS System)

Complies with UL 60335-2-40 approved standard.
Required for all systems using R-454B refrigerant.
Connects to the RDS sensor furnished with the RDS Coil Sensor Kit.
Supports up to two RDS Sensors (factory setting).
Used as interface between indoor unit and thermostat to control system in case of a refrigerant leak.
Ensures safe operation for systems equipped with R-454B refrigerant.
If a leak is detected, the refrigerant detection system will prevent compressor and heating operation until a leak is no longer detected.
Refrigeration detection system also energizes the blower if a leak is detected to mitigate any concentrations of refrigerant from the conditioned space.
Multi-color LED for system status and troubleshooting aid.
Flashing LED codes for system status (Green/Blue) and diagnosing Sensor errors (Red).
Alarm relay can trigger an external alarm if a leak is detected.
Zone relay opens all zone dampers (if part of a zoning system) if a leak is detected.
Power is disabled to non-communicating thermostats to prevent demand if a leak is detected.
On system start-up, blower runs for five minutes and any thermostat demands are disabled.
Dimensions (H x W x D): 7-7/16 x 7-7/16 x 2-1/2 (189 x 189 x 127 mm).
See R-454B Refrigerant Conversion Table on page 5.

NOTE: Refer to the Installation Instructions for additional information.

R-454B Check and Expansion Valve

For use with R-454B systems.
Wide range valve with Chatleff style fitting.
Replaces factory installed TXV, internal to cabinet.
See Optional R-454B TXV Substitution table on page 5.

Cabinet

Pre-painted heavy gauge steel.
Insulated with thick fiberglass insulation.
Flanges provided in outlet for ease of duct connection.
Removable panels provide access to coil.
Refrigerant lines extend outside of cabinet for easy installation.

Furnace Match-Up

Coils exactly match corresponding furnaces with the same letter designation in model number.
No adaptor required.
Engaging holes furnished on cabinet for alignment with furnace.

Specifications

1.5 to 2 TON

Size	18A	24A	24B
Nominal Tonnage	1.5	2	2
Furnace Cabinet Matching Letter Width	A	A	B
Coil & Furnace Cabinet Width - in.	14-1/2	14-1/2	17-1/2
Connections Liquid line (OD) sweat - in.	3/8	3/8	3/8
Suction line (OD) sweat - in.	7/8	7/8	7/8
Condensate drain (FPT) - in.	(2) 3/4	(2) 3/4	(2) 3/4
Indoor Coil Net face area - ft.²	3.5	3.5	4.67
Tube diameter - in.	3/8	3/8	3/8
Rows	2	3	2
Fins - in.	19	13	19
Shipping Data - lbs.	44	46	50

2.5 to 3 TON

Size	30A	30B	36A	36B	36C
Nominal Tonnage	2.5	2.5	3	3	3
Furnace Cabinet Matching Letter Width	A	B	A	B	C
Coil & Furnace Cabinet Width - in.	14-1/2	17-1/2	14-1/2	17-1/2	21
Connections Liquid line (OD) sweat - in.	3/8	3/8	3/8	3/8	3/8
Suction line (OD) sweat - in.	7/8	7/8	7/8	7/8	7/8
Condensate drain (FPT) - in.	(2) 3/4	(2) 3/4	(2) 3/4	(2) 3/4	(2) 3/4
Indoor Coil Net face area - ft.²	4.33	4.67	3.5	4.67	5.83
Tube diameter - in.	3/8	3/8	3/8	3/8	3/8
Rows	3	3	3	2	2
Fins per inch	16	13	13	18	18
Shipping Data - lbs.	56	54	48	49	56

3.5 to 4 TON

Size	42B	42C	48B	48C
Nominal Tonnage	3.5	3.5	4	4
Furnace Cabinet Matching Letter Width	B	C	B	C
Coil & Furnace Cabinet Width - in.	17-1/2	21	17-1/2	21
Connections Liquid line (OD) sweat - in.	3/8	3/8	3/8	3/8
Suction line (OD) sweat - in.	7/8	7/8	7/8	7/8
Condensate drain (FPT) - in.	(2) 3/4	(2) 3/4	(2) 3/4	(2) 3/4
Indoor Coil Net face area - ft.²	5.78	5.83	5.78	5.83
Tube diameter - in.	3/8	3/8	3/8	3/8
Rows	4	3	3	3
Fins per inch	13	13	13	13
Shipping Data - lbs.	67	67	61	60

4 TO 5 TON

Size	51/61C	60D
Nominal Tonnage	4 / 5	5
Furnace Cabinet Matching Letter Width	C	D
Coil & Furnace Cabinet Width - in.	21	24-1/2
Connections Liquid line (OD) sweat - in.	3/8	3/8
Suction line (OD) sweat - in.	7/8	7/8
Condensate drain (FPT) - in.	(2) 3/4	(2) 3/4
Indoor Coil Net face area - ft.²	7.22	7.94
Tube diameter - in.	3/8	3/8
Rows	3	3
Fins per inch	13	13
Shipping Data - lbs.	70	79

Air Resistance

Total Air Resistance - in. w.g.

Air Volume cfm	18A		24A		24B		30A		30B		36A		36B		36C		42B		42C		48B		48C		51/61C		60D
	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil
200	0.02	0.02	---	---	0.04	0.05	0.03	0.04	0.04	0.05	0.02	0.02	---	---	---	---	---	---	---	---	---	---	---	---	---	---
400	0.05	0.06	0.04	0.05	0.05	0.06	0.05	0.06	0.05	0.06	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
600	0.09	0.11	0.09	0.11	0.07	0.09	0.09	0.10	0.09	0.11	0.05	0.06	---	---	---	---	---	---	---	---	---	---	---	---	---	---
800	0.15	0.17	0.15	0.19	0.09	0.11	0.15	0.17	0.15	0.17	0.09	0.11	0.15	0.18	0.08	0.10	0.06	0.08	0.10	0.10	0.06	0.06	---	---	---	---
1000	0.22	0.25	0.23	0.29	0.15	0.17	0.24	0.27	0.22	0.27	0.14	0.16	0.22	0.27	0.11	0.16	0.10	0.13	0.14	0.18	0.09	0.10	0.14	0.16	---	---
1200	0.32	0.40	0.21	0.23	0.34	0.38	0.30	0.39	0.32	0.40	0.19	0.23	0.30	0.39	0.16	0.21	0.15	0.18	0.20	0.25	0.15	0.16	0.19	0.23	0.15	0.16
1400	0.43	0.50	0.28	0.30	0.45	0.51	0.41	0.48	0.43	0.50	0.26	0.30	0.41	0.48	0.21	0.27	0.19	0.23	0.26	0.31	0.18	0.21	0.25	0.29	0.20	0.23
1600	---	---	---	---	---	---	0.53	0.63	0.53	0.63	0.27	0.35	---	---	0.24	0.31	0.34	0.36	0.26	0.28	0.30	0.38	0.27	0.30	0.25	0.29
1800	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	0.42	0.47	0.31	0.38	0.38	0.42	0.33	0.39	0.31	0.36
2000	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	0.39	0.49	0.40	0.44
2200	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	0.48	0.54
2400	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---

Dimensions - Furnace/Coil Combined Dimensions

The following table details the combined dimensions for furnace and coil configurations.

Coil Size	A		B
	in.	mm	in.	mm
18A	26-1/2	673	59-1/2	1511
24A	26-1/2	673	59-1/2	1511
24B	26-1/2	673	59-1/2	1511
30A	31-1/2	800	64-1/2	1638
30B	26-1/2	673	59-1/2	1511
36A	26-1/2	673	59-1/2	1511
36B	26-1/2	673	59-1/2	1511
36C	26-1/2	673	59-1/2	1511
42B	31-1/2	800	64-1/2	1638
42C	26-1/2	673	59-1/2	1511
48B	31-1/2	800	64-1/2	1638
48C	26-1/2	673	59-1/2	1511
51/61C	31-1/2	800	59-1/2	1511
60D	31-1/2	800	64-1/2	1638

Dimensions

Diagrams show the physical layout and connection points. Key dimensions are provided in the table below.

Note 1: Optional right-hand airflow requires a field fabricated 6 in. (152 mm) spacer in-between the furnace and coil.

Size	A		B		C		D		E		F		G		H
	in.	mm	in.	mm	in.	mm	in.	mm	in.	mm	in.	mm	in.	mm	in.	mm
18A	26-1/2	673	14-1/2	368	13	330	13-3/8	340	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
24A	26-1/2	673	14-1/2	368	13	330	13-3/8	340	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
24B	26-1/2	673	17-1/2	444	16	406	16-3/8	416	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
30A	31-1/2	800	14-1/2	368	13	330	13-3/8	340	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
30B	26-1/2	673	17-1/2	444	16	406	16-3/8	416	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
36A	26-1/2	673	14-1/2	368	13	330	13-3/8	340	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
36B	26-1/2	673	17-1/2	444	16	406	16-3/8	416	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
36C	26-1/2	673	21	533	19-1/2	495	19-7/8	505	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
42B	31-1/2	800	17-1/2	444	16	406	16-3/8	416	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
42C	26-1/2	673	21	533	19-1/2	495	19-7/8	505	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
48B	31-1/2	800	17-1/2	444	16	406	16-3/8	416	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
48C	26-1/2	673	21	533	19-1/2	495	19-7/8	505	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
51/61C	31-1/2	800	21	533	19-1/2	495	19-7/8	505	3-1/4	83	1-3/4	44	3-3/8	86	4-3/8	111
60D	31-1/2	800	24-1/2	622	23	584	23-3/8	594	3-1/4	83	1-3/4	44	3-1/4	83	4-3/8	111

R-454B Refrigerant Conversion - Order Separately

Description	Order No.
Refrigerant Detection System (RDS) Coil Sensor Kit	26Z69
Refrigerant Detection System (RDS) Blower Control Board	Any Lennox® Communicating Furnace or any Non-Communicating 24V Furnace (Universal)	27A03
	Any Non-Communicating 24V Furnace	27A02

NOTE - Communicating Blower Control Board and Sensor can be used universally with Lennox® communicating furnace or any non-communicating 24 volt furnace. Non-Communicating Blower Control Board and Sensor can be used with any non-communicating 24 volt furnace.

NOTE - Order R-454B Expansion Valve separately.

Optional R-454B TXV Substitution

NOTE: R-454B Coil Conversion Kit (26Z69) is required for TXV substitution and must be ordered separately.

Size	Order Number
18	26Z70
24	26Z70
30	26Z70
36	26Z70
42	26Z71
48	26Z71
51/61	26Z71
60	26Z72

	Lennox CK40CT \| CK40UT Indoor Coils: Product Specifications Detailed product specifications for Lennox CK40CT and CK40UT indoor coils, covering capacities from 1.5 to 5 tons. Includes model number identification, features, construction details, dimensions, and air resistance data.
	Lennox CBA25UH MERIT Series Air Handler Product Specifications Comprehensive product specifications, features, electrical data, and installation guidelines for the Lennox CBA25UH MERIT Series residential air handler, covering capacities from 1.5 to 5 tons with optional electric heat.
	Lennox SL22KLV Dave Lennox Signature Collection Heat Pump - Product Specifications Detailed product specifications for the Lennox SL22KLV Dave Lennox Signature Collection residential heat pump. Features include Cold Climate operation, Variable Capacity, Precise Comfort® Technology, Quantum™ Coil, and R-454B refrigerant. Covers capacities from 2 to 5 Tons.
	Lennox Small Splits Model Number Identification Guide A guide to understanding Lennox Outdoor and Indoor Small Splits model numbers, detailing specifications like brand, efficiency, refrigerant type, voltage, cooling capacity, and unit type.
	Lennox LRP13GXK Series Commercial Packaged Gas/Electric Units Detailed product specifications for the Lennox LRP13GXK series of commercial packaged gas/electric units. This document covers features, ratings, dimensions, electrical data, and optional accessories for models ranging from 3 to 5 tons.
	Lennox EL18KSLV Elite Series Heat Pump Outdoor Units: Specifications and Features Detailed specifications, features, and installation information for the Lennox EL18KSLV Elite Series heat pump outdoor units, covering capacities from 2 to 5 tons. Includes information on SEER2, HSPF2, refrigerant type, dimensions, and electrical data.
	Lennox EL18XPV Elite Series Heat Pump Outdoor Unit Specifications Detailed specifications for the Lennox EL18XPV Elite Series variable capacity heat pump outdoor unit, featuring Precise Comfort Technology, ENERGY STAR rating, and iComfort S30 compatibility.
	Lennox CBX25UH-T MERIT Series Air Handler: Specifications, Features, and Dimensions Detailed product specifications, features, applications, and dimensional data for the Lennox CBX25UH-T MERIT Series Air Handler. This document covers models with nominal capacities from 7.0 kW to 17.6 kW (1.5 to 5 Tons) designed for upflow and horizontal installations, operating on a 50Hz power supply.