Amtrol OWB Series - Manual (Page 27)

Supply to System Shutoff Valve
S
R
Circulating Pumps
Cold Water Feed
Return from System
Drain Cock
Adjust the two manual valves to maintain 135 degree F or more in the
boiler with return water at the lowest temperature to be expected.
Figure 21.
5. INTEGRATED SYSTEM (HEAT AND DOMESTIC HOT WATER) -----
With a single heating zone priority for domestic hot water may be provided through
the use of a 3-port zone valve. This system assures that full boiler output is available
to recover the storage tank quickly and should be used where supply of domestic hot
water on demand is critical.
For this application use a full throated valve with a minimum pressure drop. See
Figure 22.
Installation, Operation, And Service Instructions
27