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Su
pp
l
y
to S
y
ste
m
Shutoff Valve
S
R
Circulatin
g
Pum
p
s
Cold Water Feed
Return from S
y
ste
m
Drain Coc
k
Adjust the two manual valves to maintain 135 degree F or more in the
b
oiler with return water at the lowest tem
p
erature to be ex
p
ected.
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