KUHL+

ELECTRONIC CONTROL

HEAT PUMP WITH ELECTRIC HEAT MODEL

YL24M35A

COMPRESSOR

WIRING DIAGRAM

UI HOLDER ELECTRONICS ASY

C

S

R

OLP

BLUE RED BLACK

SOLID STATE RELAY

2 4

 

OUTDOOR AIR SENSOR

RV

OUTDOOR COIL SENSOR

RELAY

INDOOR COIL SENSOR

 

FAN 4

 

RELAY

 

HEATER

SSR

1 3

ORANGE

BLACK

BLUE

RED

FAN 3

RELAY

FAN 2

RELAY

BLACK

RED

CAPACITOR

RED

SOLID STATE RELAY

2

4

WHITE

 

SSR

 

BLACK 1

3

YELLOW

CAPACITOR

COM

RED

BLUE

BLACK

WHITE

BROWN

FAN 1

 

 

 

 

RELAY

 

 

 

 

HEAT

 

 

DSCHRG

TO

RELAY

 

 

AIR

 

 

 

SENSOR

DISPLAY

HEAT

L2 or ACN

 

 

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

AMBIENT

 

COMP

 

 

AIR SENSOR

 

RELAY

 

 

 

 

 

L1

 

 

 

 

BLACK

 

 

 

 

WHITE

GREEN/YELLOW

 

 

 

WHITE

SUPPLY CORD

 

GREEN

 

 

 

 

OR

 

 

GREEN BRACKET TO CHASSIS

BLUE

M

F A

 

GREEN

H

 

N

 

R

 

 

E

 

 

 

 

 

 

TO INNERWALL/

 

 

 

MOTOR MOUNT

MOTOR

 

 

 

TO CAPACITOR

 

 

 

BRACKET

SCHEMATIC

NEUTRAL (115 V)

L1

3

2

1

6

 

HIGH

 

USER INTERFACE

 

 

 

F3

 

 

 

 

MEDIUM

 

 

F2

 

 

 

 

LOW

 

 

F1

 

 

 

 

ELECTRIC HEAT

 

 

 

HL

HTR

TF

EH1

 

 

ELECTRIC HEAT

 

 

 

 

 

L2 (230/208 V)

R

FAN MTR

S

FAN

COM

 

 

CAP

 

 

 

L2

REVERSING CYCLE

RV

 

 

R

 

 

 

7

RV

 

 

OLP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COMPRESSOR

 

 

C

COMPRESSOR

 

 

L1

5

COMP

 

 

 

 

 

 

 

 

 

S HERM COM

 

 

ELECTRONIC CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAP

 

 

X = CLOSED

 

 

 

L E G E N D

 

SWITCH LOGIC O = OPEN

 

 

 

 

SWITCH POSITION

CIRCUIT

 

 

 

T

 

 

 

 

1 2 3 4 5

6 7

CAP

- CAPACITOR

 

- THERMISTER

 

 

 

 

 

OFF

O O O O O O O

COMPR - COMPRESSOR

 

 

- COMBINATION TERMINAL

 

HI COOL

O O X O X

O O

MTR

- FAN MOTOR

 

 

 

 

 

- GROUNDED LEAD SYMBOL

 

MED COOL

O X O O X

O O

OLP

- OVERLOAD PROTECTOR

 

 

 

- INSULATOR

 

LOW COOL

X O O O X

O O

UI

- USER INTERFACE

 

 

HI HEAT (HP)

O O X O X

O X

TF

- THERMAL FUSE

HTR - HEATER ELEMENT

 

MED HEAT (HP)

0 X O O X

O X

 

HL

- HEATER LIMIT FUSE

 

 

 

 

LOW HEAT (HP)

X O O O X

O X

 

 

 

 

 

 

 

 

 

 

 

HI HEAT (EH)

O O X O O

X O

 

 

 

 

 

 

 

MED HEAT (EH)

O X O O O

X O

 

 

 

 

 

 

 

LOW HEAT (EH)

X O O O O

X O

 

 

 

 

 

 

 

HI FAN

O O X O O

O O

 

 

 

 

 

 

 

MED FAN

O X O O O O O

 

 

 

 

 

PART NO.

REV.

LOW FAN

X O O O O O O

 

 

 

 

 

 

 

 

 

 

92170008

00

 

 

 

 

 

 

 

 

75

Page 76
Image 76
Friedrich R-410A service manual KUHL+ Electronic Control Heat Pump with Electric Heat Model, YL24M35A

R-410A specifications

Friedrich R-410A is an advanced refrigerant widely used in HVAC (Heating, Ventilation, and Air Conditioning) systems, known for its high efficiency and environmental friendliness. As a hydrofluorocarbon (HFC) blend, R-410A has become the preferred alternative to R-22, which is being phased out due to its ozone-depleting potential. One of the main features of R-410A is its high latent heat of vaporization, which allows for efficient heat transfer and improved cooling performance in air conditioning units.

Technologically, R-410A operates at higher pressures than older refrigerants, meaning systems designed for R-410A need to be built with more robust components to safely handle these pressures. This results in a more compact system design that offers enhanced performance and reliability. The dual-component nature of R-410A—composed of difluoromethane (R-32) and pentafluoroethane (R-125)—provides an optimal balance of thermodynamic properties, leading to superior energy efficiency, especially in variable speed applications.

In terms of characteristics, R-410A has a higher cooling capacity, which enables HVAC systems to effectively cool larger spaces or run more efficiently when cooling smaller areas. The refrigerant is non-toxic and non-flammable, which enhances safety during its use. In addition, R-410A has a lower global warming potential relative to other refrigerants, making it a more environmentally responsible choice for modern cooling systems.

Moreover, R-410A systems typically require less refrigerant charge due to their efficiency, contributing to reduced greenhouse gas emissions. The adoption of R-410A aligns with regulatory trends aimed at minimizing the environmental impact of refrigerants in cooling applications.

Overall, the Friedrich R-410A refrigerant embodies a combination of technology and environmental stewardship, making it a cornerstone of contemporary HVAC design. Its ability to provide effective and energy-efficient cooling solutions while being compliant with modern environmental regulations positions R-410A as the refrigerant of choice for engineers and installers focused on sustainability and performance in air conditioning systems.