PATH freewatt HDJ, Installation, Operation & Maintenance Manual, Page: 12 / 68

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Section provides brief description of components,
controls, and accessories of hydronic freewatt PLUS
System.
3.1 Boiler
Refer to separate freewatt boiler documentation for
detailed information on the freewatt boiler.
3.2 freewatt Control Module
freewatt • control module monitors and controls
operation of Hydronic freewatt PLUS System.
Sensing inside and outside temperature as well as
other system temperatures and settings, proprietary
heating algorithm controls operation of Honda
MCHP optimizing power production and low level
heat delivery.
freewatt
• control module includes relay/interconnect
board, DC power supply, and advanced single-
board computer board incorporating powerful
microprocessor, RS-232/RS-485 serial ports, and
10/100 Base-T Ethernet port.
3.3 freewatt PLUS Hydronic Hybrid Integration
(HI) Module
freewatt PLUS • Hydronic HI Module location is
where heat in MCHP coolant is transferred into
hydronic water.
freewatt PLUS
• Hydronic HI module consists of
brazed plate heat exchanger, mixing valve, coolant
reservoir and coolant pump.
Hydronic water is pumped through secondary circuit,
•
MCHP coolant is pumped through primary circuit.
Mixing valve is fi eld adjusted to deliver minimum
•
152°F coolant to pump, which returns coolant to
Honda MCHP unit.
Coolant reservoir holds spare coolant and is
•
instrumental in proper commissioning of system.
Hydronic HI Module designed to mount on
•
adjacent wall or on side of boiler. Module’s brazed
plate heat exchanger has two ¾” NPT hydronic
water connections and two ¾” NPT coolant loop
connections connected to HI module
Hydronic water circulator for HI module is mounted
•
external to HI module as part of hydronic system
piping.
freewatt
• control module operates both HI module
coolant pump and hydronic circulator suppling
hydronic water fl ow to HI module. Coolant pump
operates on 24VDC supplied directly by freewatt
control module. Associated 120VDC hydronic
circulator is powered through ECR AR822-II relay
control.
3.4 HONDA MCHP Unit
Honda MCHP Unit is custom-engineered micro- •
combined heat and power module integrated into
Hydronic freewatt PLUS System. MCHP unit
designed to start and stop by means of digital signal
from control module when control module senses
there is heat demand in dwelling.
MCHP unit is ETL certifi ed for grid interconnection
•
if your utility allows, unit can deliver electrical
power back into electric grid. Unit provides system
operating data and diagnostic data to control
module.
3.5 Smart Zone Communicating Thermostat
Smart zone communicating HAI thermostat •
communicates directly with control module. Allows
freewatt control module to download thermostat
settings and maximize system’s electrical power
generation, providing higher level of comfort to
dwelling.
Zone which thermostat is applied is referred to as •
“Smart Zone”. Supplied communicating thermostat
must be used on one space heating zone of hydronic
system. freewatt PLUS System will not work with
any other thermostat installed in “Smart Zone”.
Compatible conventional thermostats, may be used
in other zones.
3.6 Outdoor Temperature Sensor
Hydronic • freewatt PLUS System uses two outdoor
temperature sensors to anticipate heat demand
within dwelling by tracking outdoor temperature.
Control module will determine optimum temperature
to activate Honda MCHP unit and provide thermal
comfort, maximizing generation of electrical power
as outdoor temperature falls.
Honeywell temperature sensor is connected directly
•
to freewatt PLUS Boiler and Tekmar temperature
sensor is connected directly to freewatt Control
Module.
Both sensors are required for proper operation.
•
Route in separate cables at least on foot apart to
ensure signal quality.
3.7 Internet Connection
Connecting control module to high-speed internet
service allows freewatt PLUS service provider to
monitor system’s operating characteristics. freewatt
control module will notify service provider of
abnormality, if system has operating characteristics
outside normal operating range and remote monitoring
system is enabled and active.
3 - COMPONENTS, CONTROLS AND ACCESSORIES