78
18.5 Air Handler
The Combi Boiler can control the operation of an Air Handler when thermostat is used in combination with the
Air Handler.
The Air Handler function is designed to stop the Air Handler’s pump and fan operation when the Combi Boiler’s
operation is not suitable for the Air Handler.
* In order to set up the Air Handler, from Installer Mode [I:08_Air] should be activated. (Refer to page 61)
Refer to page 51 for electrical wiring instructions.
DHW Supply
DHW Cold
Water Supply
Air Handler
Air Handler PCB
Wiring Diagram
Heating
Return
Heating Supply
Auto Feeder
PUMP
[I:09 EP] should be
“ON” in lnstaller Mode to
activate this terminal.
Recommended Pressure Setting
: 15
30 psi
Room
Thermostat
PRESSURE
GAUGE
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP WATER
BALL VALVE
(TYPICAL)
EXPANSION
TANK
Not to exceed 4 pipe Dia
or Max. 12 in. APART
Not to install an external pump upstream
an expansion tank in heating supply pipe.
* In case of installing external water feeder.
AIR SEPARATOR
Air Handler
BALL VALVE
BALL VALVE
EXTERNAL
PUMP
[CN232]
A/H
[CN233]
T - T
[CN237]
Pump
Optional LWCO
(See on the page 44)
Plumbing Applications
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