Comfortaire Century VFH-B Series User manual

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Service Manual
VFH-B Series
Inverter Multi Zone Ductless Mini-Split
A-VFH18DB-1
A-VFH24TB-1

Service Manual - VFH-B 18/24 Series
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Service Manual - VFH-B 18/24 Series
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Table of Contents
Part Ė: Technical Information.......................................................................4
1. Summary......................................................................................................................4
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3.
Outline Dimension Diagram..........................................................................9
4.
Refrigerant System Diagram......................................................................10
5.
Electrical Part...........................................................................................................11
5.1 Wiring Diagram................................................................................................................11
5.2 PCB Printed Diagram ......................................................................................................13
6.
Function and Control.........................................................................................15
Part ė: Installation and Maintenance .................................................18
7.
Notes for Installation and Maintenance............................................18
8.
Installation Manual..............................................................................................20
8.1 Electrical Connections.....................................................................................................21
8.2 Installing the Outdoor Unit...............................................................................................22
8.3 Installation Dimension Diagram.......................................................................................23
8.4 Check after Installation....................................................................................................24
9.
Troubleshooting....................................................................................................25
9.1 Flashing LED of Indoor/Outdoor Unit and Primary Judgement ......................................25
9.2 Malfunction Checking and Elimination ............................................................................26
9.3 Maintenance Method for Normal Malfunction..................................................................39
10.
Exploded View and Parts List
................................................................41
11.
Removal Procedure.........................................................................................45
Appendix:........................................................................................................................58
Appendix 1: Reference Sheet of Celsius and Fahrenheit ....................................................58
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Appendix 3: Pipe Expanding Method ...................................................................................59
Appendix 4: List of Resistance for Temperature Sensor ......................................................60

Service Manual - VFH-B 18/24 Series
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1. Summary
Part Ė: Technical Information
Outdoor Unit
A-VFH18DB-1
A-VFH24TB-1

Service Manual - VFH-B 18/24 Series
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Model A-VFH18DB-1
Product Code CB228W07700_L61437
Power
supply
Rated Voltage V~ 208/230
Rated Frequency Hz 60
Phases 1
Cooling capacity(max~min) Btu/h 18000(6155~6998)
Heating capacity(max~min) Btu/h 19000(8530~22600)
Cooling Power Input(max~min) W 1440
Heating Power Input(max~min) W 1520
Cooling Current Input A 6.26
Heating Current Input A 6.61
Rated Power Input W 2800
Rated Current A 12.42
EER (Btu/h)/W 12.5
COP (Btu/h)/W 12.5
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR CO.,LTD
Compressor Model QXA-B141zF030A
Compressor Refrigerant Oil Type RB68EP
Compressor Type Inverter Rotary
L.R.A A /
Compressor Rated Load Amp (RLA) A 10.82
Compressor Power Input W 1440
Compressor Thermal Protector 1NT11L-6233
Throttling Method Electron expansion valve
Cooling Operation Ambient Temperature
Range
OF -0.4~118.4
Heating Operation Ambient Temperature
Range
OF -4~75.2
Condenser Material Aluminum Fin-copper Tube
Condenser Pipe Diameter inch ĭ
Rows-Fin Gap(mm) inch 2-1/18
Coil length (l) X height (H) X coil width (L) inch 33 1/2X1 /12X26
Fan Motor Speed (rpm) (H/M/L) rpm 630
Output of Fan Motor W 60
Fan Motor RLA A 0.62
Fan Motor Capacitor ȝ) /
Air Flow Volume of Outdoor Unit CFM 1883
Fan Type-Piece $[LDOÀRZ
Fan Diameter inch ĭ
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IPX4
Permissible Excessive Operating Pressure
for the Discharge Side MPa 4.3
Permissible Excessive Operating Pressure
for the Suction Side MPa 2.5
Dimension (W/H/D) inch 38X27 9/16X15 39/64
Dimension of Package (L/W/H) inch 40 13/32X18X29
Dimension of Package(L/W/H) inch 40 1/2X18X29 1/2
Net Weight lb 114.7
Gross Weight lb 124.6
efrigerant Charge R410A
Refrigerant Charge oz 56.45
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Service Manual - VFH-B 18/24 Series
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Outdoor
Unit
Cross-sectional Area of Power Cable Conductor sq in 0.0032
Recommended Power Cable(Core) N 3
Connection Pipe Connection Method Flare Connection
Not Additional Gas Connection Pipe Length ft 32.8
Connection Pipe Gas Additional Charge oz/ft. 0.2
Outer Diameter of Liquid Pipe1 inch 1/4
Outer Diameter of Liquid Pipe2 inch 1/4
Outer Diameter of Gas Pipe1 inch 3/8
Outer Diameter of Gas Pipe2 inch 3/8
Connection Pipe Max. Height Distance(indoor and
indoor) ft 32.8
Connection Pipe Max. Height Distance(indoor and
outdoor and indoor up) ft 32.8
Connection Pipe Max. Height Distance(indoor and
outdoor and outdoor up) ft 32.8
Max. equivalent connection pipe length(outdoor to
last indoor) ft 32.8
Connection Pipe Max. Length Distance(total lenght) ft 65.6
The above data is subject to change without notice; please refer to the nameplate of the unit.

Service Manual - VFH-B 18/24 Series
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Model A-VFH24TB-1
Product Code CB228W07800_L61437
Power
supply
Rated Voltage V~ 208/230
Rated Frequency Hz 60
Phases 1
Cooling capacity(max~min) Btu/h 24000(7500~33000)
Heating capacity(max~min) Btu/h 26000(7500~35000)
Cooling Power Input(max~min) W 1920
Heating Power Input(max~min) W 2050
Cooling Current Input A 8.35
Heating Current Input A 8.9
Rated Power Input W 4550
Rated Current A 20.19
EER (Btu/h)/W 12.5
COP (Btu/h)/W 12.7
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR CO.,LTD
Compressor Model QXAS-D23zX090B
Compressor Refrigerant Oil Type RB68EP
Compressor Type Inverter Rotary
L.R.A A /
Compressor Rated Load Amp (RLA) A 15.82
Compressor Power Input W 2550
Compressor Thermal Protector 1NT11L-6233
Throttling Method Electron expansion valve
Cooling Operation Ambient Temperature Range OF -0.4~118.4
Heating Operation Ambient Temperature Range OF -4~75.2
Condenser Material Aluminum Fin-copper Tube
Condenser Pipe Diameter inch ĭ
Rows-Fin Gap(mm) inch 2-1/18
Coil length (l) X height (H) X coil width (L) inch 38 21/32X1 1/2X29 7/16
Fan Motor Speed (rpm) (H/M/L) rpm 800
Output of Fan Motor W 90
Fan Motor RLA A 0.59
Fan Motor Capacitor ȝ) /
Air Flow Volume of Outdoor Unit CFM 2354
Fan Type-Piece $[LDOÀRZ
Fan Diameter inch ĭ
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IPX4
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5
Dimension (W/H/D) inch 38 37/64X31 7/64X17 21/64
Dimension of Package (L/W/H) inch 42 1/2X19X33
Dimension of Package(L/W/H) inch 42 43/64X19 13/64X33 43/64
Net Weight lb 153.2
Gross Weight lb 164.3
efrigerant Charge R410A
Refrigerant Charge oz 77.6

Service Manual - VFH-B 18/24 Series
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Outdoor
Unit
Cross-sectional Area of Power Cable Conductor sq in 0.0051
Recommended Power Cable (Core) N 3
Connection Pipe Connection Method - Flare Connection
Not Additional Gas Connection Pipe Length ft 98.4
Connection Pipe Gas Additional Charge oz/ft. 0.2
Outer Diameter of Liquid Pipe1 inch 1/4
Outer Diameter of Liquid Pipe2 inch 1/4
Outer Diameter of Liquid Pipe2 inch 1/4
Outer Diameter of Gas Pipe1 inch 3/8
Outer Diameter of Gas Pipe2 inch 3/8
Outer Diameter of Gas Pipe2 inch 3/8
Connection Pipe Max. Height Distance (indoor
and indoor) ft 32.8
Connection Pipe Max. Height Distance (indoor
and outdoor and indoor up) ft 32.8
Connection Pipe Max. Height Distance (indoor
and outdoor and outdoor up) ft 32.8
Max. equivalent connection pipe length (outdoor
to last indoor) ft 65.6
Connection Pipe Max. Length Distance (total length) ft 196.8
The above data is subject to change without notice; please refer to the nameplate of the unit.

Service Manual - VFH-B 18/24 Series
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3. Outline Dimension Diagram
35 1/8
38
27 9/16
15 39/64
13 27/64
22
14 1/2
Unit:inch
Unit:inch
A-VFH18DB-1
A-VFH24TB-1
38 37/64
35 1/8 13 27/64
17 21/64
31 7/64
22
14 1/2

Service Manual - VFH-B 18/24 Series
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4. Refrigerant System Diagram
outdoor
indoor
D1
C1
B1
A1
filter
A heat exchanger
gas -liquid separator
inverter compressor
discharge silencer
discharge temperature
sensor
SP
4-way valve
outdoor heat exchanger
fan
high pressure switch
B heat exchanger
C heat exchanger
D heat exchanger
filter
filter
filter
filter
Note: Not available for 14K/18K
model
C2
C3
D3
D2
B3
B2
A2
A3
A1:A-unit electronic expansion valve B1:B-unit electronic expansion valve
C1:C-unit electronic expansion valve D1:D-unit electronic expansion valve
A2:A-unit gas pipe temperature sensor B2:B-unit gas pipe temperature sensor
C2:C-unit gas pipe temperature sensor D2:D-unit gas pipe temperature sensor
A3:A-unit liquid pipe temperature sensor B3:B-unit liquid pipe temperature sensor
C3:C-unit liquid pipe temperature sensor D3:D-unit liquid pipe temperature sensor
Note: Not available for 14K/18K model