Lennox LT-B3021HW User manual

INSTALLATION
OPERATING&
MAINTENANCEMANUAL
SPLIT CASSETTE
English
June 2002

REFERENCE EQUIVALENCE :
LENNOX REFERENCE FACTORY NUMBER
DHA 28LT-B2861HL

Contents
Functions................................................................................................................................3
Product Specifications (Cooling & Heating)........................................................................ 5
Dimensions............................................................................................................................. 8
Refrigeration Cycle Diagram............................................................................................... 11
Wiring Diagram..................................................................................................................... 13
Operation Details ................................................................................................................. 19
Installation of Indoor, Outdoor Unit.................................................................................... 22
Test Running ........................................................................................................................ 34
Cycle...................................................................................................................................... 36
Cycle Troubleshooting Guide.............................................................................................. 39
Electronic Parts Troubleshooting Guide............................................................................ 40
Electronic Control Device.................................................................................................... 44
Schematic Diagram.............................................................................................................. 45
Exploded View and Replacement Parts List...................................................................... 47
–2–

Functions
• Room temperature sensor. (Thermistor)
• Maintains the room temperature in accordance with the Setting Temp.
• Indoor fan is delayed for 5 seconds at the starting.
• Restarting is inhibited for approx. 3 minutes.
• High, Med, Low
• Intermittent operation of fan at low speed.
• The louver can be set at swing up and down automatically.
• Although the air-conditioner is turned off by a power failure, it is restarted automatically previous operation
mode after power supply.
• The setting temperature and desired operation mode are automatically set by fuzzy rule.
• Both the indoor and outdoor fan stops during defrosting.
• Hot start after defrost ends.
• The indoor fan stops until the evaporator piping temperature will be reached at 28°C.
Indoor Unit
Operation ON/OFF by Remote controller
Sensing the Room Temperature
Room temperature control
Starting Current Control
Time Delay Safety Control
Indoor Fan Speed Control
Soft Dry Operation Mode
Airflow Direction Control
Auto Operation
Deice (Defrost) control (Heating)
Hot-start Control (Heating)
Auto Restart
–3–

–4–
Remote Controller
Operation ON/OFF
Operation Mode Selection
Fan Speed Selection
Room Temperature Display
Temperature Setting
Setting the Timer
Weekly Timer
(Cooling
model only) (Heating
model only)
(Low) (Med) (High)
Cooling Operation Mode ( )
Heating Operation Mode ( ) Auto Operation Mode ( )
Soft Dry Operation Mode ( )
Fan Operation Mode
HIMEDLO
Program Holiday
SET/CLR
MinHour
Week
Timer CancelTimer Cancel
: High:39°C ↔LOW:11°C
: Fan Operates without cooling & heating
Cooling Heating
Down to 18°C
Up to 30°CDown to 16°C
Up to 30°C

Product Specifications (Cooling & Heating)
1. 60Hz
Model Name
Item Unit
Cooling Capacity Btu/h(kcal/h)
Heating Capacity Btu/h(kcal/h)
Moisture Removal l/h
Power Source Ø, V, Hz
Indoor
Outdoor
Input Cooling
Heating
Running Current Cooling
Heating
E.E.R. Btu/h-W
Indoor
Outdoor
Net Weight Indoor kg
Outdoor
Refrigerant (R-22) g
Airflow Direction Control (Up & Down)
Remocon Type
Liquid
Gas
Drain Hose
Connecting Wire
Main Power Cable
Time Delay Safety Function
Air Circulation
Soft Dry
Fan Speed (Indoor)
Timer
Self-Diagnosis
Air Circulation m3/min
Dimensions
(W×H×D) mm
W
A
LT-
B2421CL
24,000(6,048)
–
3.5
17
50
2,700
–
12.5
–
8.89
60
2,000
24,000(6,048)
24,000(6,048)
3.5
17
50
2,700
2,400
12.5
10.5
8.89
61
1,870
28,000(7,056)
–
4.0
19
52
2,850
–
12.8
–
9.82
60
2,150
30,000(7,560)
–
4.3
19
52
2,850
–
12.8
–
10.53
60
2,150
30,000(7,560)
30,000(7,560)
4.3
19
52
2,850
2,750
12.8
12.3
10.53
65
2,400
28,000(7,056)
28,000(7,056)
4.0
19
52
2,850
2,750
12.8
12.3
9.82
65
2,400
LT-
B2421HL LT- B2821CL LT-
B3021CL/CW
LT-
B2821HL LT- B3021HL/HW
–5–
Service Valve &
Connecting Tube
870 x 800 x 320
800 x 800 x 298(910 x 910 x 30)
35(30+5)
1Ø, 220V, 60Hz
870 x 655 x 320
O
Wired Remocon, Wireless Remocon(Optional)
3/8"(9.52)
5/8"(15.88)
O
0.75mm2↑
2.5mm2↑
O
O
O
3(Hi, Med, Low)
24Hrs
O

–6–
Model Name
Item Unit
Cooling Capacity Btu/h(kcal/h)
Heating Capacity Btu/h(kcal/h)
Moisture Removal ℓ/h
Power Source 󱇅, V, Hz
Indoor
Outdoor
Input Cooling
Heating
Running Current Cooling
Heating
E.E.R. Btu/h-W
Indoor
Outdoor
Net Weight Indoor kg
Outdoor
Refrigerant (R-22) g
Airflow Direction Control (Up & Down)
Remocon Type
Liquid
Gas
Drain Hose
Connecting Wire
Main Power Cable
Time Delay Safety Function
Air Circulation
Soft Dry
Fan Speed (Indoor)
Timer
Self-Diagnosis
Air Circulation m3/min
Dimensions
(W×H×D) mm
W
A
LT-B2461CL LT-B2461HL LT-B2861CL LT-B2861HL
24,000(6,048)
–
3.5
17
50
2,800
–
13.5
–
8.57
60
1,900
24,000(6,048)
24,000(6,048)
3.5
17
50
2,800
2,500
14
13
8.57
61
1,870
28,000(7,056)
–
4.0
19
52
2,850
–
13.4
–
9.82
60
2,100
28,000(7,056)
28,000(7,056)
4.0
19
52
2,850
2,650
13.4
12.6
9.82
65
2,400
Service Valve &
Connecting Tube
800 x 800 x 298(910 x 910 x 30)
1Ø, 220V~240V, 50Hz
35(30+5)
870 x 800 x 320
870 x 655 x 320
O
Wired Remocon, Wireless Remocon(Optional)
3/8"(9.52)
5/8"(15.88)
O
0.75mm2↑
2.5mm2↑
O
O
O
3(Hi, Med, Low)
24Hrs
O
2. 50Hz

–7–
Model Name
Item Unit
Cooling Capacity Btu/h(kcal/h)
Heating Capacity Btu/h(kcal/h)
Moisture Removal l/h
Power Source Ø, V, Hz
Indoor
Outdoor
Input Cooling
Heating
Running Current Cooling
Heating
E.E.R. Btu/h-W
Indoor
Outdoor
Net Weight Indoor kg
Outdoor
Refrigerant (R-22) g
Airflow Direction Control (Up & Down)
Remocon Type
Liquid
Gas
Drain Hose
Connecting Wire
Main Power Cable
Time Delay Safety Function
Air Circulation
Soft Dry
Fan Speed (Indoor)
Timer
Self-Diagnosis
Air Circulation m3/min
Dimensions
(W×H×D) mm
W
A
LT-
B3681CL
36,000(9,072)
–
5.0
22
58
4,300
–
7.5
–
–
80
3,150
36,000(9,072)
36,000(9,072)
5.0
22
58
4,300
4,100
7.5
7.0
–
81
3,150
36,000(9,072)
–
5.0
22
58
4,400
–
22
–
–
80
3,150
36,000(9,072)
36,000(9,072)
5.0
22
58
4,400
4,100
22
21
–
81
3,150
36,000(9,072)
36,000(9,072)
5.0
22
58
4,000
3,800
18
17
–
81
3,000
36,000(9,072)
–
5.0
22
58
4,000
–
18
–
–
80
3,150
LT-
B3681HL LT- B3661CL LT- B3661HL LT- B3621CL/CW
LT-
B3621HL/HW
Service Valve &
Connecting Tube
800 x 800 x 298(910 x 910 x 30)
35(30+5)
3Ø, 380-415V, 50Hz 1Ø, 220-240V, 50Hz 1Ø, 220V, 60Hz
790 x 965 x 320
O
Wired Remocon, Wireless Remocon(Optional)
3/8"(9.52)
3/4"(19.05)
O
0.75mm2↑
2.5mm2↑3.5mm2↑
O
O
O
3(Hi, Med, Low)
24Hrs
O