Specifications

8
Table 2-1 System Rating and Sizing
Unit
Input
(MBH)
Heating
Capacity
(MBH)
Overall
Effi ciency
(%)
Nominal
Power
(kWe)
Weight
(lbs)
Honda
MCHP Unit
(0 - 3,300’)
MCHP Mode
18.4 12.3 12.3 1.2 180
Backup Mode
18.5 - 26 12 - 17 12 - 17 0 - 1.8 180
Boost Mode
26 17 17 1.8 180
Boiler
Boiler Module (0 - 2,000’)
80-200 76-190 95% - 284
Ratings are for sea level applications.
Boiler: Consult boiler Installation, Operation and Maintenance Manual for high altitude conversion and derating
instructions.
Honda MCHP: Consult with ECR International Technical Support for high altitude conversion and derating instructions
Boiler manual has I=B=R Net Rating (MBH) data for system design.
Proper application of Hydronic freewatt PLUS System requires assessment of heat loss and applied building needs.
Relatively lower heat output of MCHP unit, priority heating device, and automatic modulation of fi ring rate of condensing
boiler allows Hydronic freewatt PLUS System to be applied to wide range of loads without effi ciency penalty. System
performance depends signifi cantly on sizing of heat distribution system relative to actual space heating demands.
Under-radiated distribution systems that require high system water temperatures (above 180°F during design (coldest)
day outdoor temperature conditions) will signifi cantly compromise electric generation performance of freewatt PLUS
System. Recommend hydronic heating system be designed for 160°F or lower water temperature to produce greatest
annual electrical power generation and highest energy effi ciency. 160°F design water temperature may require
installation of new radiation or re-confi guration of existing radiation to acceptably heat zones.
Hydronic freewatt PLUS System operates with two levels of heat: HONDA MCHP’s thermal output delivering low heat
and boiler delivering high heat. freewatt PLUS uses proprietary heating algorithm to ensure long MCHP operating
hours will maximize system’s electrical power production. Boiler will fi re to provide heat if additional heat is needed or
anticipated.
Boiler will automatically modulate in range of 80,000 to 200,000 BTU/hour, and MCHP unit will continue to run to
provide needed level of heat supply in high heat mode. Hydronic freewatt PLUS System operates with automatic and
programmable outdoor temperature reset of hydronic system water temperature to provide uniform heating.
2- INTRODUCTION