AERCO AM Series Boiler User Manual - Manual (Page 101)

AM Series Boilers and Water Heaters
CHAPTER 5 – OPERATION
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 101 of 156
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5.1.6 Heating System Temperature Adjustment - Boilers
The boiler provides hot water to the heating system at the temperature set by adjusting buttons
or as shown in Figure 5-1. To maximize the boilers’ performance, the heating
temperature, should be set at a value that is just sufficient to maintain the desired temperature
of the rooms.
5.1.7 Heating System Type Selection - Boilers
The boiler is factory set for constant setpoint control as per Section 3.14.4.
The heating system type can be changed by accessing the Installers Menu per Section 5.4 and
changing the 2003 parameter. One of the following heating modes can be selected:
• 2003 = 00 “Wall stat control” (see Section 3.14.4)
• 2003 = 01 “Outdoor reset control” (see Section 3.14.5). An outdoor temperature sensor
is required for this setting.
• 2003 = 04 “0=10V control” (See Section 3.14.2)
5.1.8 Outdoor Reset Adjustment - Boilers
While in the “Installers’ Menu”, set the 2003 parameter to 01. In this mode the heating supply
temperature, calculated temperature in Figure 5-2, will be adjusted automatically based on the
input from the outdoor temperature sensor. The relationship between the outdoor temperature
and the supply water temperature, corresponds with the graphs shown in Figure 5-2. In order to
change the relationship between the supply water temperature and the outdoor temperature, all
the parameters listed in the sections below must be set.
5.1.8.1 Outdoor Reset: Setting Parameters
The following are the parameter settings for Outdoor Reset (See Section 3.14.5):
• 2020 = “Warm weather shutdown temperature”. When the outdoor temperature drops this
value the heating system is forced to shut-down. Suggested starting value is 72°F (22°C).
• 2021 = “Winter outdoor temperature”. Is the design winter temperature used for the basic
heat load calculation.
• 2022 = “Winter supply temperature”. Is the supply temperature correspondent to the
“Winter outdoor temperature” (parameter 2021). Suggested values are 104°F (40°C) for
floor radiant panels or 158°F (70°C) for radiator heating systems.
• 2023 = “Spring outdoor temperature”. Is the typical spring outdoor temperature you want
the heating service to the minimum capacity. Suggested value is 64°F (18°C).
• 2024 = “Spring supply temperature”. Is the supply temperature correspondent to the
“Spring outdoor temperature” (parameter 2023). Suggested values are 86°F (30°C) for
floor radiant panels or 108°F (42°C) for radiators heating systems.
5.1.8.2 Outdoor Reset Activation
Once selected, reset adjustment is completely automatic and will switch off at the end of the
heating season and switch back on at the beginning of the heating season. When the outdoor
temperature is higher than parameter 2020, (“Warm weather shutdown temperature”) the
heating service switches off. When the outdoor temperature lowers below parameter 2020,
(“Warm weather shutdown temperature”), the heating service switches back on. If, for some
reason, the heating service doesn’t match the load, adjust parameters 2022 (during cold winter)