Cooling Cycle; Heating Cycle; Zoned Systems; Performing Routine Maintenance - Rinnai DONSR07A12 Owner's Manual

COOLING CYCLE

When operating in the COOL mode, your system will run until the indoor temperature is lowered to the level you
have selected (within design conditions)� On extremely hot days, your system will run for longer periods at a time
and have shorter 'off' periods than on moderate days.
The following typical conditions add extra heat and/or humidity to your home causing your system to work longer
to maintain comfortable conditions:
Entrance (external) doors are frequently opened &
closed�
Operating laundry appliances or running showers�
More than the usual lights or electrical appliances
operating�

HEATING CYCLE

In HEAT mode, the system will provide warmth until the temperature is raised to the level you have selected�
The unit will operate for longer periods to maintain a comfortable environment on colder days and nights than on
moderate ones�
Defrost Cycle: When the system provides heating to your home and the outdoor temperature drops below 7�2°C,
moisture may begin to freeze on the surface of the outdoor coil� If allowed to build up, this ice would impede the
airflow across the coil and reduce the amount of heat absorbed from the outside air. To maintain energy efficient
operation, your Rinnai Heat Pump has an automatic defrost cycle�
The defrost controls will automatically start when there is sufficient ice to interfere with normal heating operation.
During defrost, the Indoor Fan will not be running� After the ice is melted, or after a maximum of 10 minutes in
defrost mode, the unit will automatically resume normal heating operation�
Do not be alarmed if steam or fog appears at the Outdoor Unit during the defrost cycle� Water vapour from the
melting ice may condense into a mist in the cold outdoor air�

ZONED SYSTEMS

Some home comfort systems are designed to operate on a zoned basis only – i�e� they are not designed to heat
and or cool the entire home or space at one time� Generally, a zoned system will be designed by your Installer
for your specific requirements. Your particular zoning configuration and the basis of design should be specified
and detailed by your Installer� With zoned systems, always observe the following:
•
The Return Air grille(s) are generally in the 'Common Zone', and need to be part of the conditioned space
at all times�
•
Close off all doors to areas that are not being conditioned – i.e. effectively isolate unconditioned spaces.
•
Set your zoning configuration with your zone controls before starting your Rinnai system.
•
Do not attempt to shut down more zones than the minimum as specified by your installer, as this may lead
to system shut down�
•
Do not attempt to heat or cool more zones than the maximum specified by your installer as this will prevent
the system from being able to maintain design conditions� NOTE: The type of zoned system you have will
have been specified by your installer. This should include information on the total number of zones, the
minimum and maximum number recommended to operate at one time to maintain design conditions, and
the actual design conditions (Indoor Temperature Control settings at specified Outdoor Ambient conditions
for both Heating and Cooling)�

PERFORMING ROUTINE MAINTENANCE

With proper maintenance and care, your Rinnai system will operate economically and dependably�
Maintenance can be accomplished easily by referring to the following general directions� However, before
performing maintenance, consider these important safety precautions:
•
DISCONNECT ALL ELECTRICAL POWER TO HEAT PUMP BEFORE REMOVING ACCESS PANELS TO
PERFORM SERVICE OR MAINTENANCE – NOTE: THERE MAY BE MORE THAN ONE ELECTRICAL
ISOLATING SWITCH
•
ALTHOUGH SPECIAL CARE HAS BEEN TAKEN TO MINIMISE SHARP EDGES IN THE CONSTRUCTION
OF YOUR UNIT, BE EXTREMELY CAREFUL WHEN HANDLING PARTS OR REACHING INTO THE UNIT�
Rinnai
More than the usual number of people�
Window furnishings open on sunny side of home�
System operating at or outside the original system
design conditions as specified by your Installer
13
GENERAL USER GUIDE
Ducted Heat Pump OM