(When the frequency>Heat_F4 via capacity demand).
HEAT_F6 IHEATLMT2
HEAT_F5 IHEATLMT1
If the current frequency is lower than HEAT_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds and stop. The AC will restart 3
minutes later.
8.5.5 Indoor / outdoor units communication protection
If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes, the AC will stop
and display the failure.
8.5.6 High condenser coil temp. protection.
When T3>65℃ for 3 seconds, the compressor will stop while the indoor fan and outdoor fan will continue.
When T3<52 ℃, the protection will release and the compressor will restart after 3 minutes.
8.5.7 Outdoor unit anti-freezing protection
When T2B<0 ℃ for 250 seconds, the indoor unit capacity demand will be zero and resume to normal when
T2B>10 ℃.
8.5.8 Oil return
Running rules:
1. If the compressor frequency keeps lower than RECOILINFRE for 2hours,the AC will rise the frequency
to RECOILFRE for 3mins and then resume to former frequency.
M2OC-18HRDN1-M 45
M3OC-27HRDN1-M 45
M4OC-36HRDN1-M 40
2. During the oil return process, the EXV and indoor units keep the current running mode, the frequency
will not be limited by the compressor discharge temp. and the current.
8.5.9 Compressor preheating functions
----Preheating permitting condition:
If T4(outdoor ambient temperature)＜3 ℃ and newly powered on or if T4＜3 ℃
for over 3 hours, the compressor heating cable will work.
----Preheating mode:
A weak current flow through the coil of compressor from the wiring terminal of compressor, then the
compressor is heated without operation.
----Preheating release condition:
If T4＞5 ℃ or the compressor starts running, preheating function will stop.
8.5.10 Compressor crankcase heater
When T4<3℃ and the compressor is not running, the crankcase heater will be active.
When T4≧5℃ or the compressor starts up, the crankcase heater will stop work.
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