Warm Air freewatt
®
PLUS System - Main Panel Confi guration
APC Universal Transfer Switch
1.
Main Service Panel
2.
2
1
Warm Air freewatt
®
PLUS System - Model WDJ:
Domestic Hot Water Loop
Potable water connections are for two separate and distinct purposes.
Heat Rejection System connection is to single wall brazed plated heat exchanger downstream of 3-way mixing valve.
Water is used to cool Honda MCHP’s coolant during Grid Boost or Back-Up mode. In DHW Boost mode, Honda MCHP’s
heat is transferred into potable water. Direct-fi red water heater is connected to double-walled brazed plate heat exchanger
with ½” piping and includes Hot Water Recirculation Circulator (Grundfos UP-10 or Taco 003 recommended). If equivalent
length of recirculation piping system is over 100 feet, it is recommended use ¾” piping system.
TYPICAL CONFIGURATION
Water Cooled Heat
Rejection System
shown
Double wall brazed plate heat
exchanger and 3-way valve included
with WDJ models for supplemental
domestic hot water production.
Not included in WAJ models.
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