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6.2 SECONDARY LOOP HEATING SYSTEM
The following are typical piping systems. It is the responsibility of the installing contractor to determine
which system best meets the need of the installation. Contractor modifications to these instructions may
be required, based upon existing piping and system design.
6.2.1 Multiple Zones using Zone Valves
6.2.2 Multiple Zones using Pumps
Zone
1
Zone
2
Zone
3
Normally closed 4
wire Zone Valves
With End Switches
Primary
Loop
Max. 12” apart
See figure
7.2.1 “Multiple 4 wire Zone Valves”
for wiring
7.2.2 “Multiple Zones with Taco Valve
controller
See figure
7.2.3 “Multiple Zones using pumps
and pump controller”
Installer may require throttling and
check valves to correctly regulate the
system
Zone 1
Zone 2
Zone 3
Pumps sized to each
zones flow and head
requirements
Primary
Loop
Max. 12” apart
