MAXA R407C - Page 50

CD 30 ÷ 520
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2. Components description
1——Compressor B current detection (Protection code P5)
2——Compressor A current detection (Protection code P4)
The current will not be detected at the first 5 seconds when starting, after that, if the current is
exceeds the pre-set protection standard, (18A for both of digital and constant), compressor
will stop, and restart 3 minutes later.
3——T4: Outdoor Temperature sensor (failure code E7).
T
3B
: Condenser B tube Temperature sensor (failure code E6, protection code P7).
T
3A
: Condenser A tube Temperature sensor (failure code E5, protection code P6).
T4
If any one system needs to start the outdoor fan, the fan will be started by the unit electric
controller. The fan has two speed levels: high and low which all depends on the T4
Temperature.
T
3B
ǃT
3A
When unit electric controller detects the Temperature of T
3B
or T
3A
are higher than 65ć,
the corresponding system will stop, then restart after the Temperature is lower than 60ć
or less. Meanwhile the other system keeps running without any influence.
T4ǃT
3B
ǃT
3A
The alarm will work if the voltage detected by the Temperature sensor is less than 0.05V or
more than 4.95V.
z If main unit sensor of fails: all units will stop.
z If auxiliary unit sensor fails: this unit will stop while the others keep running.
4——System A compressor discharge gas Temperature sensor (failure code E8, protection code
P8) is only available for main unit.
5——T61,T62 Outlet water Temperature sensor of plate heat exchanger (failure code E4).
Capacity output will adjust according to the outlet water Temperature of the plate heat
exchanger both in cooling and heating models.
(Auxiliary unit) constantly adjusting range: ON and OFF;
(Main unit) digitally adjusting range: OFF, 40%, 60%, 80% and 100%.
6——T3 Total outlet water Temperature sensor (failure code E3), just valid for main unit.
Adjust the Capacity output adjustment according to the outlet water Temperature of the