Water Heater Installation Manual
48 Page
FREEZE PROTECTION SYSTEM
• This water heater comes equipped with heating blocks to protect it from damage associated with freezing.
When the freeze protection thermostat senses air temperature below 36.5 °F (2.5 °C), the blocks will heat up
to prevent freezing of the unit.
• The 540HX3 Indoor model briefly fires on for about 3 seconds to provide freeze protection around the heat
exchanger drum - Automatic firing system. Once 5 minutes have elapsed since the 540HX3 Indoor previous
firing operation, the computer will continually check the temperature of the exhaust thermistor. The freeze
-
tor.)
• To operate these freeze protection systems, there has to be electrical power to the unit. Damage to the heat
exchanger caused by freezing temperatures due to power loss is not covered under the warranty. In cases
where power losses can occur, consider the use of a backup power supply. In the event of a power outage
during freezing conditions, the manufacturer recommends draining water (page 50) from the water heater
and disconnecting power.
• In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor installation
with an indoor model.
• The manufacturer also highly recommends the use of a backflow preventer (sold separately) to minimize the
amount of cold air entering through the exhaust venting when the water heater is off.
• It is the installer’s responsibility to be aware of freezing issues and take all preventative measures. The man-
ufacturer will not be responsible for any damage to the heat exchanger as a result of freezing.
• If you will not be using your heater for a long period of time:
1. Completely drain the water out of the unit. Refer to page 50.
2. Disconnect power to your heater.
This will keep your unit from freezing and being damaged.
Only pipes within the water heater are protected by the freeze protection system. Any water
pipes (hot or cold) located outside the unit will not be protected. Properly protect and insulate
these pipes from freezing.
NOTICE
Normal Operaon
Owner's Guide