AM Series Boiler & Water Heater User Manual
CHAPTER 9
– OPERATION
OMM-0100_E
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GF-146
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11/15/2019
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9.2 Freeze Protection
For the freeze protection function to operate, the unit must remain connected to the electrical
and gas supplies with DHW and central heating service switched to OFF
The freeze protection function is designed to protect the appliance only, not the heating system.
Because the water heater freeze protection function depends upon the electrical and gas
supply, it is mandatory to install a safety device that alarms the user in case the unit room will
reach a temperature near 35°F (2°C).
Once the boiler has reached a temperature of 50 °F (10 °C), the heating pump will automatically
turn on. If the temperature falls below 41 °F (5 °C), the burner will light to prevent the boiler from
freezing. If the boiler will not be used for long time it should be drained per Section 10.23.
9.3 Display Energy Saving Mode
The display, in Figure 9-1 is switched off each time no key is touched for at least 30 minutes,
with the exception of when it displays errors or settings.
9.4 Control Panel Display
During normal operation, the display remains off, except if the unit goes into Lockout, or has a
Blocking error. Pressing any button will activate the display, which will stay on for 30 minutes
from the time of the last button press.
