The Ipw - How It Works - Lochinvar 100 Series Installation & Service Manual

The IPW - How it works...

1. Control valve
The 3-way electronic control valve is powered by 24 VAC
which is received from the electronic control system control
box. The temperature controller in the control box supplies
a 0 - 10 VDC control signal to precisely modulate the 3-way
valve to accurately control the temperature of the DHW
output to the desired set point.
2. System water outlet
ANSI flanged connections (2", 3", or 4" depending on model
size) with carbon steel piping that returns boiler water back to
the system loop.
3. System water inlet
ANSI flanged connections (2", 3", or 4" depending on model
size) with carbon steel piping that receives boiler water from
the system loop.
4. P & T Relief valve
Protects the heat exchanger from an over pressure condition.
The relief valve provided with the unit is set at 150 psi and
210°F.
5. Electronic control system control box
Contains a control box assembly which includes all of the
electronic circuitry for the electronic control system.
addition, the electronic control system includes several sensors
and safety devices which provide temperature and flow control
information to the control box circuitry.
Typical IPW Packaged Water Heater
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Indirect Plate Water Heater Installation & Service Manual
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6. DHW inlet
ANSI flanged connections (2" or 3" depending on model size) with
stainless steel piping that receives cold water from the DHW
piping.
7. DHW outlet
ANSI flanged connections (2" or 3" depending on model size) with
stainless steel piping that delivers heated water back to the DHW
piping.
8. Recirculation pump
The recirculation pump helps prevent scale buildup by providing
constant recirculation through the heat exchanger on the DHW
side. It also preheats the cold water before it enters the heat
exchanger.
9. Heat exchanger
Allows water to flow between plates for maximum heat transfer
while keeping boiler water from contacting potable water.
10. Frame / skid assembly
Supports the HEX and piping while providing another method to
move and transport the unit.
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