73
Installing a Cascade System
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System Application #1- Cascade System with Closely Spaced Tees
12” (30 cm)
maximum
Air separator
Sub2
Sub1
Main
Temperature
sensors (required)
Cold water
Supply
Return
Backflow preventer
Expansion tank
Note
●
Connect the “SH Demand (SH T/T or Zone controller)” to the main unit.
●
Connect the supply/return sensors to SUPPLY and RETURN terminals of the CNT1/2 terminal strip
on the main unit PCB.
●
Connect the outdoor sensor (optional) to the main unit.
●
Install system pumps to the units (main and sub) as required by the system configuration. When
configuring a cascade system, the output of the zone pumps installed at the main and sub units
are used as the output of the secondary system pump.
●
Connect zone pumps to the zone controller. Do not connect zone pumps to the main or sub units.
●
System Application #2- Cascade System with Hydro Separator
Sub2
Sub1
Main
Cold water
Supply
Return
Dirt collector
Hydro/Air separator
Backflow preventer
Expansion tank
Temperature
sensors (required)
Note
●
Connect the “SH Demand (SH T/T or Zone controller)” to the main unit.
●
Connect the supply/return sensors to SUPPLY and RETURN terminals of the CNT1 terminal strip on
the main unit PCB.
●
Connect the outdoor sensor (optional) to the main unit.
●
Install system pumps to the units (main and sub) as required by the system configuration.
●
Connect zone pumps to the zone controller. Do not connect zone pumps to the main or sub units.
