APC UTS6H Specifications download pdf (Page 46)

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

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APC UTS6H Specifications Page 46

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