AC

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