Navien LCB700-21RS, Installation & Operation Manual

Page: 24 / 96

24 Installing the System Piping
PS
TP
FS FV
EV
S1
AAV
Circulating Pump
Pressure
Relief
Valve
Pressure
Sensor
Expansion Vessel
Drain Valve
Automatic
Bypass Valve
Flow
Valve
Flow
Sensor
Mixing Valve
Auto Air
Vent
Temp.
Sensor
Pressure
Gauge
High Limit Stat
Heat
Exchanger
Combi Boiler
3Way
Valve
AAV
Filling L
oop
Heat Storage
Tank
Hot W
a
ter
Ex
changer
<Combi boiler Heating & DHW Cycle>
When installing the system, follow these guidelines:
Use only pipes, fittings, valves, and other components (such as
solder), that are approved for use in potable water systems.
Tighten the connection valves with care to avoid damage.
The external hydraulic bypass valve is required.
An additional expansion vessel must be installed to the system
in the central heating return.
PS
TP
S1
S3
EV
E
V
Pressure
Sensor
Expansion
Vessel
Drain
Valve
Pressure
Relief
Valve
Expansion
Vessel
Automatic
Bypass
Valve
High Limit Stat
Temp.
Sensor
Auto Air Vent
Pressure Gauge
Heat
Exchanger
Regular Boiler
<S Plan Layout>
2Way
Valve
<Y Plan Layout>
3Way
Valve
Auto Air Vent
Temp.
Sensor
Filling L
oop
Circulating
Pump
DHW
Tank
<Regular Boiler Heating & DHW Cycle>
CAUTION
When installing an optional circulating pump, ensure that it
is installed in the proper direction. Also, install the circulator
pump to the return pipe and allow it to circulate hot water
towards the boiler. If a circulator pump is installed in the
wrong direction, the boiler’s heat exchanger cannot be
vented properly, which may damage the boiler and cause
it to malfunction.
PS
TP
S3
EV
EV
S1
Expansion
Vessel
Pressure Relief Valve
Pressure
Sensor
Expansion Vessel
Drain Valve
Automatic
Bypass
Valve
High Limit Stat
Temp.
Sensor
Auto
Air Vent
Auto Air Vent
Pressure Gauge
Heat
Exchanger
System Boiler
<S Plan Layout>
2Way
Valve
<Y Plan Layout>
3Way
Valve
Auto Air Vent
Temp.
Sensor
Auto Air Vent
Filling L
oop
Circulating
Pump
DHW
Tank
<System Boiler Heating & DHW Cycle>
Note
Refer to “7. Setting the DIP Switches” to control the
boiler using the external CH Controller and DHW Tank.