PATH freewatt HDJ, Инструкция по установке, эксплуатации и обслуживанию, Страница: 46 / 68

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15.3 Achieving Best freewatt PLUS System
Performance
Homeowner dollar, carbon dioxide emissions, and energy
saving with freewatt PLUS is maximized by adjusting
operating parameters of boiler and thermostat to achieve
maximum preferential operation of MCHP unit (and
minimum fi ring of boiler).
Following steps will help in maximizing benefi t of freewatt
PLUS System.
Set top target temperature of boiler reset operating •
temperature control (parameter 4) at lowest possible
temperature that will meet heating needs of home
on coldest days of year. Recommended maximum
top target temperature is 160°F per Commissioning
Procedure. Setting top target temperature greater than
160°F will signifi cantly reduce operation of MCHP unit
and resulting electric power production. Set target
temperature lower if possible.
Set Aquastat on indirect water heater no greater than
•
125°F.
Although it is contrary to modern heating system
•
practice, it is recommended to avoid using setback with
freewatt PLUS System. Using setback will typically
cause Honda MCHP to shut down during setback
hours as thermostat will be satisfi ed, particularly
during early stages of setback. This reduces MCHP
run hours and power generation signifi cantly, thus
reducing electric bill savings and cost effectiveness
of freewatt system. Coming out of setback
requires the freewatt boiler to run more to make
up additional heat demand. Setting thermostat at
a constant temperature and leaving in there will
maximize comfort, power generation and electric bill
savings. Set it, forget it, and save.
Select Smart Zone and confi gure if necessary, so it •
represents at least 25% of total heat demand of home.
Set individual zone thermostats so Smart Zone set
•
point is about (1 or 2 degrees) above other zones in
home will help maximize production of electricity by
freewatt PLUS System.
Set
• freewatt PLUS boiler parameter 11 to zero per
Commissioning Procedure. Turns off temperature boost
feature of boiler control. If occupants are dissatisfi ed
with response of heating system to thermostat set
point adjustments, consider altering outdoor reset
curve, using Parameters 4, 5, 6, and 7 before adjusting
Parameter 11 to non-zero setting. Keeping parameter
11 at zero is benefi cial when there are heating zones
that do not have critical heating comfort requirements
but will produce nearly constant call for heat. Near
constant call for heat can result from heating zone
being “under radiated” or heat convectors being closed
off. freewatt PLUS performs best when all heating
zones have appropriate amount of radiation.
15 - DETAILED SEQUENCE OF OPERATION