16
6.2.3 Multiple Zones with different temperatures
Using pumps and tempering valves
Using Injection pumps
Loop 1
High
Temp.
Injection
Pump
Primary loop
Max. 12” apart
Max. 12” apart
Max. 12”
apart
Max. 12”
apart
Loop 2
Low
Temp.
Injection
Pump
Loop Pumps sized to each loops flow and head requirements
Boiler sensor #2
(Lo Temp.)
Boiler sensor #1
(Hi Temp.)
Mix sensor #1
(Hi Temp.)
Mix sensor #2
Lo Temp.)
See figure
7.2.3 “Multiple Zones using pumps,
and pump controller”
By setting the tempering valves to
different settings, multiple
temperatures can be obtained.
Installer may require throttling and
check valves to correctly regulate the
system.
Other configurations may work, but
under no circumstances can a mixing
valve be placed in the primary loop as
overheating of the boiler could occur.
See figure
7.2.4 “Multiple temperature Zones
using injection pump”
Installer may require throttling and
check valves to correctly regulate
the system
Zone 3
High Temp.
Tempering valve
Zone 2
Med. Temp.
Zone 1
Low Temp.
Pumps sized to each
zones flow and head
requirements
Primary
Loop
Max. 12” apart
