Specifications

20
7.3 Considerations for System Location
Before selecting location for system, following should
be considered. Each system component considered for
installation must be:
Supplied with correct type of gas.•
Connected to separate (two) combustion gas vent •
pipes discharging to outdoors: one for freewatt PLUS
Boiler unit and one for MCHP unit. Each vent must
meet minimum and maximum vent lengths for each
unit. (See Section 10).
Connected to suitable combustion air intake piping •
system to supply fresh (outdoor) air for combustion (3”
for freewatt PLUS Boiler) (not required for MCHP)
(See Section 10)
Connected to suitable forced hot water distribution •
system.
Supplied with suitable 120VAC electrical supply for •
all system motors and controls and separate 240VAC
supply for MCHP unit.
Connected to properly located thermostat or operating •
control ( freewatt PLUS requires communicating
Smart Zone thermostat supplied with system and must
be installed and connected to “Zone 2”).
Placed on level surface (must NOT be installed on •
carpeting).
Condensate drain line must be pitched down to fl oor •
drain or external condensate pump with reservoir at ¼”
per foot (wood frame or concrete blocks may be used
to raise boiler). MCHP unit must be bolted to concrete
fl oor as specifi ed.
7.4 Locating the System
Select level location central to distribution system and •
close to vent and air intake terminals.
Use accessibility clearances for system installation, if •
more stringent (i.e. larger clearances) than required
fi re protection clearances.
Must install MCHP unit on solid, concrete fl oor with •
adequate make-up air available for 18,500 Btu/hr net
input heating appliance. System shall not be installed
on carpeting. Shimming should be done between base
and MCHP, not between base and fl oor.
Install equipment in location facilitating operation of •
venting and combustion air intake piping systems
described in this manual (Section 10).
Advise owner to keep venting and combustion air •
intake passageways free of obstructions. Both venting
and combustion air intake piping systems connected
to outdoors must permit fl ow through piping systems
without restrictions for system to operate.
Install control module and switching components to •
protect from water (dripping, spraying, rain, etc.)
during operation and service (pump replacement, MCHP
maintenance, etc.).
Locate system where ambient room temperatures •
(minimum possible temperatures where system is
installed assuming system is not in operation and
therefore contributes no heat to space) are at or above
32°F to prevent freezing of liquid condensate.
7.5 Combustion Air and Vent Pipe
Requirements
System requires dedicated direct vent system for boiler •
and separate vent for HONDA MCHP to discharge all
combustion products to outside atmosphere.
Boiler requires combustion air intake to complete its •
sealed combustion direct-vent system and provide air
from outdoors. HONDA MCHP requires make-up air
from installation space.
CAUTION
Keep system area clean of debris and free of
fl ammable and combustible materials, vapors and
liquids.
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Combustion air supply and boiler vent pipes must •
terminate together in same atmospheric pressure zone,
through roof or sidewall (roof termination preferred).
Boiler and MCHP vent terminations may be at different
locations, feature may assist in locating appropriate
venting locations. Consult boiler and HONDA MCHP
Installation Manuals for specifi c guidelines for required
clearances and installation instructions.
Refer to boiler Installation, Operation and Maintenance •
Manual for guidelines regarding concentric vent
termination installation and guidelines.
7 -BEFORE INSTALLING THE SYSTEM