Technical data

Installation, Operation, And Service Instructions 29
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.
Figure 24.
S
R
Circulatin
g
Pum
p
s
Cold Water Feed
Shutoff Valve
Drain Coc
k
Su
pp
l
y
to S
y
ste
m
Return from S
y
ste
m
Zone Valves
Indirect Water Heater
S
R
Circulatin
g
Pum
p
s
Cold Water Feed
Shutoff Valve
Drain Coc
k
Su
pp
l
y
to S
y
ste
m
Return from S
y
ste
m
Flow Control Valves
Indirect Water Heater