Steffes 9180 - Manual (Page 7)

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DiScHarGe air/Water SySteM
The 9100 Series heating systems can be used as straight hydronic heating appliances or as a combination hydronic
and forced air system with the addition of a field supplied air handler, water coil, and duct sensor. In all systems, to
deliver stored heat, the 9100 Series needs to receive a signal from a thermostat, BACNet system, energy manage-
ment system, or serial communication input. This signal will initiate one of several levels of heat call.
When a heat call is initiated, the system displays the type of heat call on the status screen of the control panel, the
primary loop pump is energized, and the outlet water temperature is monitored. The desired discharge water tem-
perature is regulated based off of the target temperature (L127) established.
Brick core cHarGe control
Steffes heating systems are capable of providing a wide variety of heating options for various applications. The
heating system's primary function is to store energy in the form of heat. Because the system is operated with mi-
croprocessor based control, it is very flexible in meeting the demands of the application. The rate at which energy
is stored can be controlled with BACNET, 4-20, or pulse inputs.
The amount of energy stored is based on the target level which is determined by outdoor temperature, utility peak
conditions, building automation system, and/or the heating requirements. Sensors monitor the brick core tempera-
ture and communicate this information to the processor control board. If the current charge level is lower than the
target level of any core, elements will be energized as allowed by the load management system.
cHarGe control overriDe
If desired, the ThermElect Hydronic system can be programmed to allow a charge control override. This override
allows the user to force the system to target a full core charge level and can be initiated or cancelled at any time. If
an override is initiated, the system targets a full core charge level during the next off-peak period. It continues to
charge during off-peak hours until it achieves full (maximum) core charge or until the override is cancelled. Once
full charge is achieved or the override is cancelled, the system charges according to the standard configuration.
Maintenance anD cleaninG
Any air filter(s) in the system should be replaced on a regular basis to ensure proper operation and to maintain
overall efficiencies. No additional routine maintenance is required.
If utilizing a heat pump or air conditioning system with the ThermElect Hydronic system, the indoor coil should
be cleaned periodically as dirt accumulation may reduce system efficiency. It is important to follow the manufac-
turer’s maintenance and cleaning recommendations for these devices.
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