Mitsubishi Job Site Sheet - Branch Box Systems

Meier Supply Branch
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In order to receive efficient technical support on Mitsubishi multi zone system that use a branch box we require the following information. Please completely fill out this form with the actual readings taken using test equipment. Failure to provide all or accurate readings will result in a delay in diagnosing the system or a false diagnosis. The service switch SW1 of the outdoor unit can be used to gather some information. Some of the switch settings have been provided. Refer to the technical service manual for a full list SW1 switch settings and available data. If you have any questions please contact your local Meier Supply representative.

Complaint: (Give a detailed description of the service issue)
Outdoor Unit Information:
Model Number
Serial #
Service Reference #
SW1 Setting SW2 Setting

Address settings:
Operation Mode
Are there any faults being displayed at the outdoor unit?

YesNo
If yes list the LED fault being displayed:
Are there any stored fault codes in the unit? (SW1 setting 11010000)
Is LED 3 lit:

YesNo
L1-L2 Voltage
DC Bus Voltage (CNDC)
TBIB Voltage
TB3 Voltage (M-Net)
Outside air temperature (TH7)(SW1 setting 10110010)
Target head psi Heating Mode (PdM)(SW1 setting 10010110)
Target suction saturation temperature Cooling Mode (ETm)(SW1 Setting 01010110)
Low side pressure at compressor (631.S)(SW1 setting 01011100)
High side pressure at compressor (63HS) (SW1 setting 01010010)
Suction line temperature (TH6) (SW1 setting 00110010)
Liquid line temperature (TH2) (SW1 setting 10111100))
Discharge line temperature (TH4)(SW1 setting 11010010)
What is the physical temperature of the gas pipe at the outdoor unit?
What is the physical temperature of the liquid pipe at the outdoor
Has the system been checked for cross piping or wiring?

	SW1 Setting	SW2 Setting
Address settings:

	Model #	Serial #	B.B. #
Branch Box

	Model #	Serial #	B.B. #
Branch Box

Branch Box 01 Information:
Address Setting SW11 Setting:
SW 12 Setting:
Is LED 1 lit?

YesNo
How many times is LED 2 Blinking?
What size wire is used between the Outdoor units and the branch box between TB3 and TB5?
What type of wire is used between the Outdoor units and the branch box between TB3 and TB5?
What size wire is used between the indoor units and the branch box?
Gas pipe temperature (main)
Liquid pipe temperature (main)
TBS Voltage M1-M2
TB2B Voltage

	S1 - S2	S1 - S3	S2 - S3
Zone A Voltages:
Zone B Voltages:
Zone C Voltages:
Zone D Voltages:
Zone E Voltages:

Branch Box Information (other):
Address Setting SW11 Setting
SW 12 Setting
Is LED 1 lit?

YesNo
How many times is LED 2 Blinking?
What size wire is used between the Outdoor units and the branch box between TB3 and TB5?
What type of wire is used between the Outdoor units and the branch box between TB3 and TB5?
What size wire is used between the indoor units and the branch box?
Gas pipe temperature (main)
Liquid pipe temperature (main)
TB5 Voltage MI-M2
TB2B Voltage

	S1 - S2	S1 - S3	S2 - S3
Zone A Voltages:
Zone B Voltages:
Zone C Voltages:
Zone D Voltages:
Zone E Voltages:

	Circuit A	Circuit B	Circuit C	Circuit D	Circuit E
Location
Model #
Serial #
Type of Controller

	Circuit A	Circuit B	Circuit C	Circuit D	Circuit E
Location
Model #
Serial #
Friendliness

Branch-Box address

Branch-Box address

Indoor Unit A

Indoor Unit B

Indoor Unit C

Indoor Unit D

Indoor Unit E

Indoor Unit A

Indoor Unit B

Indoor Unit C

Indoor Unit D

Indoor Unit E