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AC Power

CWS = Cold Water Supply CWR = Cold Water Return CW = Cold Water Valve (variable 0-100%) S1, S2 = solenoid restrictor valves TCZ = Temperature Control Drive W/H = Electric Water Heater (thermostated) FT1, FT2 = Flow Transmitters (paddle wheel) TT1 ... TT4 = Temperature transmitters (RTD).

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AC Power

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  1. CWS = Cold Water Supply CWR = Cold Water Return CW = Cold Water Valve (variable 0-100%) S1, S2 = solenoid restrictor valves TCZ = Temperature Control Drive W/H = Electric Water Heater (thermostated) FT1, FT2 = Flow Transmitters (paddle wheel) TT1 ... TT4 = Temperature transmitters (RTD) 4-way valves TT 1 CW CWS S1 FT 1 TT 2 S2 CWR TT 3 W/H FT 2 TT 4 TCZ Pump VVVF Drive AC Power

  2. Counter-current, HW on tube side TT 1 CW CWS S1 FT 1 TT 2 S2 CWR TT 3 W/H FT 2 TT 4 TCZ Pump VVVF Drive AC Power

  3. Co-current, HW on tube side TT 1 CWR TT 3 CW CWS S1 FT 1 TT 2 S2 W/H FT 2 TT 4 TCZ Pump VVVF Drive AC Power

  4. Counter-current, HW on Shell side CW CWS S1 FT 1 TT 1 S2 TT 3 TT 2 CWR W/H TT 4 FT 2 TCZ Pump VVVF Drive AC Power

  5. Co-current, HW on Shell side CWR TT 1 TT 3 CW CWS S1 FT 1 TT 2 S2 W/H FT 2 TT 4 TCZ Pump VVVF Drive AC Power

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