Comfort Star EHK05A User manual

- 0 -
DC Inverter R410A
Air Conditioners & Heat Pump
Service Manual 2014

- 1 -
CONTENTS
1. Precaution......................................................................................................................................... - 2 -
1.1 Safety Precaution.............................................................................................................- 2 -
1.2 Warning & Caution...........................................................................................................- 2 -
2. Function ............................................................................................................................................ - 4 -
2.1 Model Names Of Indoor/Outdoor Units................................ Error! Bookmark not defined.
2.2 Specifications....................................................................... Error! Bookmark not defined.
3. Dimension......................................................................................................................................... - 4 -
3.1 Indoor Units .....................................................................................................................- 4 -
3.2 Outdoor Units...................................................................................................................- 5 -
4. Refrigerant Cycle Diagram.............................................................................................................. - 6 -
5. Wiring Diagram................................................................................................................................. - 7 -
5.1 Indoor Units .....................................................................................................................- 7 -
5.2 Outdoor Units.................................................................................................................- 12 -
6. Installation Details ......................................................................................................................... - 14 -
6.1 Outdoor Unit Installation ................................................................................................- 14 -
6.2 Indoor Unit Installation ...................................................................................................- 27 -
6.3 Maintenance And Replacement Of Outdoor Unit Electronic Control Box.......................- 41 -
7. Operation Characteristics ............................................................................................................. - 43 -
8. Electronic Function........................................................................................................................ - 44 -
8.1 Abbreviation...................................................................................................................- 44 -
8.2 Main Control Logic .........................................................................................................- 44 -
8.3 Main Control Board Ports Instructions ...........................................................................- 48 -
8.4 Outdoor Unit Status Display...........................................................................................- 52 -
9. Troubleshooting ............................................................................................................................. - 53 -
9.1 Outdoor Unit Error Display.............................................................................................- 53 -
9.2 Diagnosis And Solution..................................................................................................- 54 -

- 2 -
1. Precaution
1.1 Safety Precaution
This is a safety alert symbol. When you see this symbol on labels or in manuals, be
alert to the potential for personal injury.
This is an attention alert symbol. When you see this symbol on labels or in manuals,
be alert to the potential for personal injury.
Understand and pay particular attention to the signal words DANGER, WARNING, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not avoided, will result in death or
serious injury.
WARNING indicates a potentially hazardous situation, which, if not avoided, could result in death or
serious injury.
CAUTION indicates a potentially hazardous situation, which, if not avoided may result in minor or
moderate injury. It is also used to alert against unsafe practices and hazards involving only property
damage.
1.2 Warning & Caution
Outdoor Installation
Improper installation may create a condition where the operation of the product could
cause personal injury or property damage.
Improper installation, adjustment, alteration, service or maintenance can cause injury or
property damage. Refer to this manual for assistance or for additional information, consult a
qualified contractor, installer or service agency.
This product must be installed in strict compliance with the installation instructions and any
applicable local, state, and national codes including, but not limited to building, electrical, and
mechanical codes.
Fire or electrical hazard

- 3 -
Failure to follow the safety warnings exactly could result in serious injury, death or property
damage.
A fire or electrical hazard may result causing property damage, personal injury or loss of
life.
If using existing refrigerant lines make certain that all joints are brazed, not soldered.
Do not touch the top of compressor, it may cause minor to severe burning.
Indoor Installation
Disconnect all power to unit before installing or servicing. More than one disconnect switch
may be required to de-energize the equipment. Hazardous voltage can cause server personal
injury or death.
If removal of the blower assembly is required, all disconnect switches supplying power to
the equipment must be de-energized and locked (if not in sight of unit ) so the field power wires
can be safely removed from the blower assembly. Failure to do so can cause electrical shock
resulting in personal injuring or death.
Because of possible damage to equipment or personal injury, installation, service, and
maintenance should be performed by a trained, qualified service personnel. Consumer service is
recommended only for filter cleaning / replacement. Never operate the unit with the acess panels
removed.
These instructions are intended as an aid to qualified, licensed service personnel for
proper installation, adjustment and operation of this unit. Read these instructions thoroughly
before attempting installation or operation. failure to follow these instructions may result in
improper installation, adjustment, service or maintenance possibly resulting in fire, electrical shock,
property damage, personal injury or death.
The unit must be permanently grounded. Failure to do so can result in electrical shock
causing personal injury or death.

- 4 -
2. Function (Refer the specification)
3. Dimension
3.1 Indoor Units
DIMENSIONAL DATA
MODEL SIZE
Dimensions inch
UNIT HEIGHT "H" IN. UNIT WIDTH "W" IN. UNIT LENGTH "D" IN.
LIQUID LINE /
VAPOR LINE
24 46-1/2" 19-5/8" 21-5/8" 3/8"/3/4"
36 54-1/2" 22” 24" 3/8"/3/4"
48 54-1/2" 22" 24" 3/8"/7/8"
60 54-1/2" 22" 24" 3/8"/7/8"
H
D

- 5 -
3.2 Outdoor Units
DIMENSIONAL DATA
Mode size Dimensions
Refrigerant connection
Service Valve Size
AC HP “H” in. “W” in. “L” in. Liquid in. Suction in.
24/36 24/36 24-15/16 29-1/8 29-1/8 3/8 3/4
48/60 48/60 33-3/16 29-1/8 29-1/8 3/8 7/8
W

- 6 -
4. Refrigerant Cycle Diagram
For cooling only models:
For heat pump models:
stop
volve
stop
volve
COM P
Outdoor Unit
FAN
nut
nut
Indoor Unit
evaporator
FAN
expansion
valve
T5
discharge
temp.sensor
high pressure
switch
pressure
senser
T3
condenser temp.
sensor
condenser
REFRIGERATION FLOW
FAN
evaporator
Indoor Unit
nut
nut
FAN
T3
condenser
temp. sensor
Outdoor Unit
high pressure
switch
T5
stop
volve
stop
volve
SV4
expansion
valve
COMP
condenser
discharge
temp.sensor
low pressure
receiver
T4 ambient
temp. sensor
pressure
senser
filter
filter
EEV
check valve
REFRIGERATION
FLOW HEATING
COOLING

- 7 -
5. Wiring Diagram
5.1 Indoor Units
Indoor unit wiring diagram for PSC motor A/C systems and H/P systems.

- 8 -
Indoor unit wiring diagram for ECM motor A/C systems and H/P systems(24K/36K/48K).

- 9 -
Indoor unit wiring diagram for ECM motor A/C systems and H/P systems (60K).