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Product Introduction
Basic Functions - 30K & 36K 230 volt
If Tpreset -3.6ºF < Tamb < T1.8ºF, the compressor remains at its original operation state.
If Tamb < Tpreset -3.6ºF, the compressor will stop, the outdoor fan will stop with a time lag of 60s, and the indoor fan
will operate at low speed.
b. Protection
Protection is the same as that under the cooling mode.
(3) Heating Mode
a. Working conditions and the process of heating
If Tamb < T3.6ºF, the unit enters heating mode, in which case the four-way valve, the compressor and the
outdoor fan will operate simultaneously, and the indoor fan will run at preset speed in the condition of preset cold
air prevention.
If Tamb > T9ºF, the compressor will stop, the outdoor fan will stop with a time lag of 60s, and the indoor fan
will stop after 60-second blow at low speed.
If T3.6ºF < Tamb < T9ºF, the unit will maintain its original operating status.
• Under this mode, the four-way valve is energized and temperature can be set within a range of 61-86F. The
operating symbol, the heating symbol and preset temperature are revealed on the display.
b. Condition and process of defrost
When duration of successive heating operation is more than 45 minutes, or accumulated heating time more than 90
minutes, and one of the following conditions is reached, the unit will enter the defrost mode after 3 minutes.
A. Toutdoor amb > 41ºF, Toutdoor pipe < 28.4ºF
B. 28.4ºF < Toutdoor amb
C. 23ºF < Toutdoor amb < 28.4ºF, Toutdoor pipe < 17.6ºF
D. 14ºF < Toutdoor amb <23ºF, Toutdoor pipe – Tcompensation < (Toutdoor amb -5.4ºF)
E. Toutdoor amb < 14ºF, Toutdoor pipe – Tcompensation < (Toutdoor amb -5.4ºF)
F. Toutdoor pipe > 35.6ºF, Tccompensation =0ºF; b) Toutdoor pipe < 35.6ºF, Tccompensation = 5.4ºF
At that time, the indoor fan stops and the compressor stops, and after 60 seconds the outer fan will stop, and then
after 30 seconds, the four-way valve will stop. After 30 seconds, the compressor is initiated for raising the frequency
to defrost frequency. When the compressor has operated under defrost mode for 10 minutes, or Touter tube > 50ºF,
the compressor will be converted to 46Hz operation. After 30 seconds, the compressor will stop. And after another
30 seconds, the four-way valve will be opened, and after 60 seconds, the compressor and the outer fan will be started,
the indoor fan will run under preset cold air prevention conditions, and H1 will be displayed at temperature display
area on the display panel. Defrost frequency is 70Hz.
c. Protection
• Cold air prevention
The unit is started under heating mode (the compressor is ON):
1. In the case of Tindoor amb. <75ºF: if Ttube <104ºF and the indoor fan is at stop state, the indoor fan
will begin to run at low speed with a time lag of 2 minutes. Within 2 minutes, if Ttube > 104ºF, the indoor
fan also will run at low speed; and after 1-minute operation at low speed, the indoor fan will be converted
to operation at preset speed. Within 1-minute low speed operation or 2-minute non-operation, if Ttube
>108ºF, the fan will run at present speed.
