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Service Manual VMH SerieS Heat Controller, Inc.
8. Electronic control function
8.1 Abbreviations
T1: Indoor ambient temperature
T2: Coil temperature of indoor heat exchanger middle.
T2B: Coil temperature of indoor heat exchanger outlet.
T3: Coil temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Set point temperature.
8.2 Electric control working environment.
8.2.1 Input voltage: 230V.
8.2.2 Input power frequency:60Hz.
8.2.3 Indoor fan normal working amperage. is less than 1A.
8.2.4 Outdoor fan normal working amperage. is less than 1.5A.
8.2.5 Four-way valve normal working amperage. is less than 1A.
8.2.6 Swing motor: 12V DC.
8.3 Outdoor unit’s digital display
There is a digital display tube in outdoor PCB.
Digital display functions:
• In standby , the LED displays “- -”
• When compressor is operating, the LED displays the running frequency,
• In defrosting mode, The LED displays “dF” or alternatively displays between running frequency and
“dF”(each displays 2s)
• In compressor pre-heating, The LED displays “- -”
• In protection or malfunction modes, the LED displays the associated error code or protection code.
8.4 Outdoor unit point check function
There is a check switch in outdoor PCB.
Push the switch SW1 to check the states of unit when the unit is running. The digital display will display the
following each time the SW1 switch is preserved.
No.SW1
Pressed
Display
Remark
1
Indoor unit capacity demand code
2
Outdoor unit running mode code Off:0, Cooling:1, Heating:2
3
Amendatory capacity demand code
4
Outdoor unit fan motor state Off:0, Low speed:1, High speed:2
5
Evaporator outlet temp. for 1# indoor unit
Actual data is measured, however due to display limitations
if the temp. is lower than -9 degrees, the digital display will
show “-9”. If the temp. is higher than 70 degrees, the digital
display will show “70”. If the indoor unit is not connected, the
digital display tube will show: “- -“.
6
Evaporator outlet temp. for 2# indoor unit
7
Evaporator outlet temp. for 3# indoor unit
8
Evaporator outlet temp. for 4# indoor unit
9
Condenser pipe temp.
10
Ambient temp.
11
Compressor discharge temp. Actual data is measured, however due to display limitations
if the temp. is lower than 0 degrees, the digital display will
show “0”. If the temp. is higher than 99 degrees, the digital
display will show single digit and a tens digit. For example if
the digital display shows “0.5”, it means the compressor