INS
TALLA
TION
On-Demand Water Heater Installation Manual and Owner’s Guide
49
WARNING
• To set pump operation for freeze protection, adjust only the No. 4 DIP switch in the
UPPER bank of DIP switches. (See below.) DO NOT adjust the other DIP switches.
• Turn off the power supply to the water heater before changing the DIP switch settings.
• Failure to observe these warnings could lead to carbon monoxide poisoning, severe
personal injury, or death.
• There are two systems for freeze protection in the water heater-
heating block system
and
recirculation system
with the integrated pump.
▪
This water heater comes equipped with heating blocks to protect the unit against damages 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.
▪
T
his water heater can recirculate the water in the pipes installed in the recirculation system with the
integrated pump to prevent freezing. When the integrated thermistors detect water temperature below
50°F (10
°C
), the pump will activate and recirculate the water in the recirculation line. Use only with the
Recirculation with Dedicated Line mode.*
• 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 any areas subject to freezing temperatures, the manufacturer highly recommends an indoor installation.
• 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 and owner's responsibility to be aware of freezing issues and take all preventative measures.
The manufacturer 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 p. 69.
2. Disconnect power to your heater.
This will keep your unit from freezing and being damaged.
The freeze protection system does not protect the X3™ Cartridge. Refer to the manufacturer for
freeze protection options for the X3™ Cartridge.
NOTICE
*Recirculation system for freeze protection is only activated when the built-in/remote controller is off. When the
integrated thermistors detect the water temperature above 52°F (11°C) over five minutes, the operation is deacti-
vated. Pump operation for freeze protection is deactivated from the factory. If you want to activate the recircula-
tion system for freeze protection, change the DIP switch setting below.
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
INSTALLATION
Change the DIP switch
1. Turn off the power supply to the water heater.
2. After removing the front cover, remove the screw to pull
out the PCB.
3. Change the DIP switches referring to the table for each
setting.
4. Put back the PCB into the unit and attach the removed
screw and reinstall the front cover.
Step 17:
Freeze protection system
Step 17:
Freeze protection system
Pump operation for freeze protection
Active
Inactive
Upper bank
of
DIP switches
1
2
3
4
5
6
7
8
ON
No. 4: OFF
1
2
3
4
5
6
7
8
ON
No. 4: ON
DEFAULT
Summary of Contents for 160X3P
Page 84: ...7J8071 1 2000570774 REV B...
