Natco VW Installation And Operating Instructions Manual page 16

140°
Water
180° To Bldg.
Water
To Bldg.
Conventional
Tank
24" Min.
B
Cold
Water
180°
Water
To Bldg.
140°
Water
To Bldg.
Cold
Water
Figure 16 – Two-Temperature Hot Water Supply System (Model VW or PW)
H
C
J
D
To
I
Drain
E
Conventional
Tank
Pump
PW Series
VW Series
B
D
To
Drain
K
E
140° Water
Return
From Bldg.
180° Water
Return
From Bldg.
H
Pump
C
PPW Series
PVW Series
To Drain
K
K
140°Water
Return
From Bldg.
180°Water
Return
From Bldg.
H
C
H
C
J
I
To Drain
15
With
Horizontal
Tank
Legend
B – Check Valve in Hot Water Supply to
Tempering Valve
C – Check Valve in Return Line from Building Loop
D – Tempering Valve
E – Venturi (Suction) Tee
H – Throttling Valves in Building Loop Returns
I – Circulating Pump for 180° Building Loop
J – Circulating Pump for 140° Building Loop
K – Service Valves to isolate Heater and Pump for
Service
With
Vertical
Tank
Legend
B – Check Valve in Hot Water Supply to
Tempering Valve
C – Check Valve in Return Line from Building Loop
D – Tempering Valve
E – Venturi (Suction) Tee
H – Throttling Valves in Building Loop Returns
I – Circulating Pump for 180° Building Loop
J – Circulating Pump for 140° Building Loop
K – Service Valves to isolate Heater and Pump for
Service