ECR International AMB-4, Инструкция по применению

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PN 240013666 REV. A [06/30/2022]
AMB-4 Multiple Boiler Control (MBC) Application
1.
Sequence of Operation – The control will drive the boilers to a target water temperature based on
demand from:
A� Boiler Demand: A target water temperature is calculated based on a programmable heating curve�
i� The control can receive boiler demand either from 20 – 260V (ac) to terminals 21 and 22, or
from an Energy Management System (EMS) by applying 0-10 or 2-10 V (dc) signal to terminals
2 & 3 when the DIP switch is set to EMS�
ii� Supply water target temperature is determined by a signal from building energy management
system or outdoor reset�
iii� Heating curve may also adjust supply temperature based on building heat distribution (radiant
floor, fan-coil, baseboard, etc.)
iv� It is recommended minimum supply temperature be such that corresponding return water
temperature be at least 120 degrees F to prevent condensation in the boiler� Generally, this will
require minimum supply water temperature of at least 140°F, or provide boilers with bypass as
describe in boiler instructions�
v� Optional warm weather shutdown is available�
vi� The Hydrolevel control will not allow a supply temperature setting above 220° F�
vii�
The MBC may operate up to four on/off boilers as a heat source. For proper operation of
the boilers, the MBC must be the only control that determines when a boiler is to fire.
*Important note:
The boiler control (Hydrolevel 3200) must remain in the burner circuit and
act as a secondary upper limit on the boiler temperature� The Hydrolevel 3200 temperature
setting must be adjusted above the MBC’s boiler maximum setting to prevent short cycling of
the burner�
viii� The MBC includes a rotate feature to change the firing order of the boilers. Various boiler
sequencing options are available as described in the MBC instructions�
B� Domestic Hot Water: DHW demand may be driven by either an aquastat or DHW sensor�
i� When DHW demand is present, the control will specify the higher of either the DHW supply
temperature or calculated CH supply temperature�
ii� DHW is provided by providing power to the DHW loop circulator�
iii� DHW demand may be assigned priority, or not� If DHW is given priority, and the total demand
exceeds boiler capacity, the CH circulator will shut off. DHW priority period time may be set to
automatically calculate and vary depending upon outdoor temperature at the time�
iv� DHW loop may be piped in parallel with primary circuit�
C� Setpoint Operation: Not available if DHW mode is in use�
i� The control will select the higher of the setpoint temperature or current target water
temperature�
ii� Setpoint demand is generated from a 20 to 260V signal applied across the appropriate
terminals�
iii� Operating mode can be varied depending upon piping arrangement�
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