Air-cooled modular chiller unit 50Hz MCAC-ATSM-2011-12
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3
T4: outdoor ambient temperature sensor (fault code E7)
T3B: pipe temperature sensor of the condenser B (fault code E6 and protection code P7)
T3A: pipe temperature sensor of the condenser A (fault code E5 and protection code P6)
1) T4: if there is one system that requires starting outdoor fans, the fans are started through electric control of the unit.
Start outdoor fan A only, start A and B gears, and control the unit through T4.
2) T3B and T3A: when the electric control of the modular unit detects the temperature of the outdoor pipe T3A or T3B of
the system exceeds the protective temperature 65 C, the corresponding system
will be shut down. And it will be re-started up, after the temperature drops below the recovery temperature 60 C. Another
system will be not affected.
3) T4, T3B and T3A: when the temperature sensor is detected to suffer open circuit or short circuit, fault alarm will occur.
● When the main unit suffer fault of temperature sensor: the main unit and slave units will be shut down.
● When the slave unit suffer fault of temperature sensor: the unit will be shut down, but other slave units will not be
affected.
4
Discharge temperature sensor of the digital compressor of the system A (fault code E8,protection code P8),only the digital
unit is valid, and the fixed speed unit is invalid.
5
Unit outlet water temperature sensor (fault code E4)
Under cooling mode and heating mode, conduct adjustment according to the double-pipe heat exchanger outlet water
temperature.
Adjustment range of constant speed capability: ON and OFF.
6
Total outlet water temperature sensor (fault code E3)
Only the main unit is valid, and the slave units are invalid.
Under cooling mode and heating mode, conduct adjustment according to the magnitude of total outlet water temperature.
Adjustment range: shut-down, 40%, 60%, 80% and 100%.
7
Spot check. The operating status of outdoor system can be observed through spot check, and specific display contents
are as shown in the following figure:
● Display contents of “operating mode”: 1. cooling; 2. heating; 4. pump; 8. Stand-by
● Display contents of “number of online units”: the main unit can display the number of online units, and the slave unit
displays 0.
8
Selection code of the compressor
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