Installation Manual

42 Hydronic Air Handler Installaon and Operaon Manual
If the temperature of the water within the hot
water coil were to drop below 40°F, the
thermostat circuit between R and W is
completed, activating the hot water circulating
pump, external circulating pump or isolation
valve. When the water temperature rises above
70°F, the thermostat circuit between R and W is
opened and hot water will stop circulating within
the hot water coil.
To prevent the freeze protection from activating
the water circulating pump when in cooling
mode, move freeze stat to far left or far right of
water coil, and insulate with foam tape
insulation.
The State of Massachusetts requires the use of
a pump timer on domestic water applications to
periodically circulate water during the off cycle.
This pump timer requirement is a standard,
factory-installed feature on this air handler. The
pump timer activates the circulating pump or
isolation valve for one minute every six hours by
completing the thermostat circuit between R and
W. The pump timer is skipped while the outdoor
compressor is operating.
WARNING
Electrical Shock:
• Before servicing the air handler, turn off power
to unit. There may be more than one
disconnect switch.
• Improper installation, modification, service,
maintenance or use of the air handler can
cause electrical shock, burns or other
conditions which may cause electrical shock,
personal injury, property damage or death.
WARNING
To service the air handler, follow the steps below.
1. Turn off power to the unit.
2. Remove the four screws securing the front panel.
3. Perform service or maintenance to the air handler,
and then reinstall the four screws to secure the front
panel.
Maintenance:
• At the beginning of each heating season, the air
handler should be serviced by a qualified installer or
servicing agency. Verify proper operation after
servicing.
• It is important that compartments, filter, and
circulating air passage ways of the appliance be kept
clean.
• The supply and return air ducts should be inspected
at least annually for blockages or damage.
• Keep the motor free of dust and dirt by cleaning
annually.
• It is recommended that a trained and qualified
professional who has attended a Rinnai
installation training class perform service to the
air handler.
• Do not use this air handler if any part has been
under water. Immediately call a licensed
professional to inspect the unit and replace any
part that has been under water.
• Do not use substitute materials. Use only parts
certified for the air handler.
• Any alteration to the air handler can be
dangerous and will void the warranty.
The factory-installed freeze protection on all
air handlers is designed to protect the coil
from freezing. The installer must take steps to
protect the water piping from freezing.
Insulating the piping is highly recommended.
IMPORTANT