Daikin EWAD620-C17C-SS, Service Manual

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General Outline ESIE10-01
1–100 Part 1 – System Outline
3
11
4
5
Note: Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact
water connection of the partial recovery exchangers.
Compressor The single-screw compressor is of the semi-hermetic type with an asynchronous three-phase,
two-pole motor directly splined on the main shaft. The suction gas from the evaporator cools the
electric motor before entering the suction ports. There are temperature sensors inside the electric
motor which are completely covered by the coil winding and constantly monitor motor temperature.
Should the coil winding temperature become very high (120°C), a special external device connected
to the sensors and to the electronic controller will deactivate the corresponding compressor. There are
only three moving rotating parts and there are no other parts in the compressor with an eccentric
and/or alternating movement. The basic components are therefore only the main rotor and the two
satellites that carry out the compression process, meshing perfectly together. The F3B and F4A
compressors are fitted with two satellites arranged horizontally to the screw. Compression sealing is
obtained thanks to a suitably-shaped special composite material that is interposed between the main
screw and the satellite. The main shaft on which the main rotor is splined is supported by ball bearings.
The system made up in this way is both statically and dynamically balanced before assembly.
6 Fans
7 Condensation bank
8 Load valve
9 2-way angle valve
10 Filter dryer
11 Sight glass
12 Solenoid valve
13 Thermostatic expansion valve
14 Non-return valve
15 Electronic expansion valve
16 Water outlet temp. transducer
17 Evaporator
18 Water inlet temp. transducer
19 Low-pressure safety valve
20 Suction valve (optional)
21 Suction gas temp. transducer
22 Suction gas press. transducer
23 High-pressure pressure switch
24 Oil/delivery press. transd.
25 Delivery gas temp. transducer
26 Liquid injection valve
27 Liquid injection mesh filter
F4AL compressor