Specifications

4
2- INTRODUCTION
2.2 Application Notes
Maximum design water temperature of 160°F. Heat •
emitters sized for heat output using maximum
design water temperature of 160°F. Heat loss
calculations based on approved industry methods and
outdoor temperature corresponding to design water
temperature appropriate for local area’s weather.
Hydronic•
freewatt PLUS System may be applied to
normal variety of heating loads served by conventional,
multi-zone hydronic heating systems.
base-board radiation, •
radiant fl oor heating, •
domestic hot water via indirect storage tank, •
powered convective heaters, •
hydro-air handlers*•
NOTE: *Application limited to specifi c air handler models.
Hydronic • freewatt PLUS Systems use circulators
or valves for individual zone temperature control.
Confi guration of hydronic distribution system must be
in form shown in this manual with respect to overall
arrangement of freewatt PLUS Boiler and MCHP unit
with respect to zone loads.
See specifi c piping schematics provided for systems •
zoned with circulators and valves and for systems using
air handlers.
freewatt • Control Module is common to all applications
of hydronic freewatt PLUS System. Different ECR zone
pump/valve relay controls required for use with pump and
valve-zoned systems and hydro-air systems.
Appropriate pump/valve relay control from ECR •
family of zone controls must be used as supplied with
freewatt PLUS System.
See specifi c electrical wiring diagrams provide for •
circulator zoned systems, valve zone systems, and
systems with air handlers.
Do not use anti-freeze solution in • freewatt PLUS System
hydronic fl ow loop. Use only good quality water. Install
heat exchanger to isolate anti-freeze solution from main
hydronic system, if particular zone requires anti-freeze
protection.
Priority domestic hot water heating is available and must be •
properly selected in setup of Control Module and ECR zone
controls.
Indirect water heater aquastat setting must be between •
120 to 125°F.
Mixing valve must be used on domestic water supply •
outlet of any indirect water heating tank applied with
freewatt PLUS . Do not use set back.
2.1 Hydronic freewatt PLUS system is gas-fi red micro-
combined heat and power (micro-CHP) system suitable for
residential and light commercial space and water heating
applications up to 200,000 Btu/hr.
freewatt PLUS • System consists of these main
components:
high effi ciency (condensing) boiler•
control module •
hydronic hybrid integration (HI) module •
HONDA MCHP unit•
freewatt • transfer switch
electrical load distribution and management
•
panel
zone control relays
•
heat rejection system •
freewatt • high effi ciency boiler Model FW95M certifi ed
as Category IV direct vent central heating boiler with
combustion air supplied directly from outdoors through
special air intake system. Combustion products of
freewatt Boiler are exhausted to outdoors through
direct vent system.
Hydronic hybrid integration (HI) module and control •
module integrate freewatt Boiler and HONDA MCHP
unit into hydronic heating circuit of building.
HONDA MCHP unit, Model MCHP1.2 D & DP, is •
manufactured by HONDA Corporation for use with
freewatt PLUS System.
Produces electrical power while also generating heat •
in response to building’s nor mal thermostatic heat
demand. The
Produces 240VAC power delivered to main circuit •
panel through 240VAC dedicated circuit.
Certifi ed under UL 2200 - Stationary Generators •
and UL 1741 - Inverters, Converters, Controllers
and Interconnection Sys tem Equipment for Use With
Distributed Energy Resources.
HONDA MCHP unit utilizes indoor air for combustion •
and vents combustion products to outdoors with
PVC pipe. Honda MCHP unit is non-direct vent
appliance.
For additional details on system components refer to
section 3.