ABOUT YOUR WATER HEATER
12
TIMER CONTROL
A Timer function on the Display Panel allows the hours of operation of the water heater to be set during one
or two timed periods in a 24-hour period. Refer to “Timer” on page 21.
It may be desirable to operate the water heater during daytime hours when the air temperature is warmer and
the heat pump is more efficient, or not to operate between certain hours, such as during peak energy demand
periods of a Time of Use electricity supply when more expensive tariffs may apply.
If the water heater is set to run during one or two timed periods, the heat pump and the electric heating unit
will not operate outside of this timed period under Standard Heating operation. It is therefore necessary for the
hours of operation set by the Timer to be sufficient to heat up the full volume of water in the tank from cold to
60°C. The hours of operation sufficient to achieve this will depend on various factors, including the climate and
amount of hot water used during the period in which the Timer operates. As a guide, for this water heater this
can be up to six (6) hours in a cold climate in winter (if no hot water is used during this period). If hot water is
used, the hours of operation set by the Timer may need to be increased.
Notes
• The 571D270 model water heater is recommended for connection to an uninterrupted 24 hour continuous
tariff power supply. Depending upon the size of the household and its hot water requirements and if the
Electricity Retailer permits, an extended off-peak (overnight and day) or Extended time-controlled power
supply connection of a minimum 16 hours per day may also be suitable.
• If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched off,
otherwise damage could result (refer to “Freeze Protection” on page 10).
PRECAUTIONS
The water heater must be maintained in accordance with the Owner’s Guide and Installation Instructions. Refer
to “Maintenance Requirements” on page 30 and to “Anode Inspection and Replacement” on page 32.
If this water heater is to be used where an uninterrupted hot water supply is necessary for your application or
business you should ensure that you have back-up redundancy within the hot water system design. This should
ensure the continuity of hot water supply in the event that this water heater were to become inoperable for any
reason. We recommend you seek advice from your plumber or specifier about your needs and building back-
up redundancy into your hot water supply system.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater:
• Switch off the electrical supply at the water heater isolating switch on the switchboard or at the isolating
switch at the water heater.
• Close the cold water isolation valve at the inlet to the water heater.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off, otherwise damage could result (refer to “Freeze Protection” on page 10).
TO TURN ON THE WATER HEATER
• Open the cold water isolation valve fully on the cold water line to the water heater.
• Switch on the electrical supply at the water heater isolating switch on the switchboard and at the isolating
switch at the water heater.
• Check and if required reset the Timer function on the Display Panel.
Note: When the electrical supply is switched on, there will be a knocking sound coming from the heat pump
for a short period of time. This is the electronic expansion valve operating. This is normal and not a fault with
the heat pump.
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