AERCO AM Series Boiler User Manual - Manual (Page 103)

AM Series Boilers and Water Heaters
CHAPTER 5 – OPERATION
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 103 of 156
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5.1.9 Boiler Delays, Alarms and Protective Actions
To protect the life of the appliance, improve comfort, and maximize energy savings, the
following timings have been incorporated into the control logic:
a) Pump delay: each time the room thermostat is
satisfied, the circulator pump continues to
run for 4 minutes;
b) DHW delay: each time the domestic
hot water demand is satisfied, a 4 minute delay
must pass before the end of the service;
c) Time delay in restarting the burner in its normal functioning state, every time the burner
stops, there is a delay time of 3 minutes before the boiler restarts again.
5.1.10 Boiler Circulator Pump Protection
During the summer months, the circulators pumps are run once a day for around 15 seconds to
prevent it from seizing.
5.1.11 Freeze Protection - Boilers
For the freeze protection function to work, the boiler 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 boiler 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 6.1.4.
5.1.12 Display Energy Saving Mode
The display, in Figure 5-3, is switched off each time no key is touched for at least 30 minutes,
with the exception of when it displays errors or settings.