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Indirect Water Heater
Su
pp
l
y
to S
y
ste
m
S
R
Circulatin
g
Pum
p
s
Cold Water Feed
Shutoff Valve
Zone Valves
Return from S
y
ste
m
Drain Coc
k
Figure 23.
7. INTEGRATED SYSTEM, SINGLE OR MULTIPLE HEATING ZONES,
USING CIRCULATING PUMPS RATHER THAN ZONE VALVES----
Each pump will require a separate relay (Honeywell R845A or White Rodgers 828A-
845, or equivalent). Install a flow control valve in each zone including the indirect
water heater to prevent gravity circulation. Install a balancing valve in each zone and
adjust so that flow in each zone is about the same. (see Figure 24.) While this basic
system does not provide priority for domestic hot water, priority can be provided as
shown in Wiring Section, Figure 27.
Indirect Water Heater
Su
pp
l
y
to S
y
ste
m
Flow Control Valves
Shutoff Valve
S
Return from S
y
ste
m
R
Cold Water Feed
Circulatin
g
Pum
p
s
Drain Coc
k
Figure 24.
Installation, Operation, And Service Instructions 29