11 Testing Board Introduction11.1 Compose of the Testing BoardThe testing board is in front of the electrical box and is quite visible. The testing board has the followingadvantages: detects indoor unit numbers and indoor unit address, displays real running functionality anddetects code automatically. It is composed of the function section, data section and the button section.11.2 Instruction of Function and Data SectionRunning state The display of function section The display of data sectionStopķ The section displays the numbers of theindoor units which have establishedcommunication with the outdoor unit. Forexample, if there are seven established indoorunits, the section displays “7”.ĸ It displays the address of the indoor unitsby turns. For example, the “1b” is representedof the indoor unit 1B.(Branch Unit module:1/2/3ˈIndoor unit: A/b/C/d/E)ķ If the function section displays thenumbers of the indoor units, the datasection displays the outsidetemperature. For example, the “95” isrepresented of .ĸ If the function section displays theaddress of the indoor unitˈthe datasection displays the model of theindoor unit, for example, the “95” isrepresented of 95 model.NormalThe code of running state:Code Runningstate Code Running stateUE Pressureequalization UH HeatingUP Pump down F7 Oil returningUC Cooling H1 DefrostingIt displays the target gear of thecompressor. If the gear is zero, itdisplays “0”. For example, the gear isthe fifteenth; it displays “15”. Therange of the gear is from 0 to 60.MalfunctionIf the malfunction occurs in the system, thesection displays the error code. If there areseveral malfunctions, it displays the errorcodes by turns at intervals of 2 seconds.ķ If the malfunction occurs in theoutdoor unit, the section displaysnothing.ĸ If the malfunction occurs in theindoor units, the section displays theaddress of the indoor unit.Function section Data section Button section35(95 )°C°F25