Steffes 8188 - Manual (Page 7)

T HERM E LECT O PERATION
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1.03
TEMPERATURE CONTROL
Temperature set point is adjusted at the wall thermostat(s) or the main system control. If temperature in the area
drops below the desired set point, a heat call is initiated and the blower in the ThermElect system is energized.
The variable speed core blower automatically adjusts speed in relation to brick core temperature and duct tem-
perature to circulate air through the brick core. The supply air blower then delivers the heated air into the desired
area through the duct system to satisfy heating requirements.
When used to supplement heat pump systems, the ThermElect system replaces resistance strip heat, which is
typically required as a supplement or back-up to the heat pump system. The outlet sensor monitors the discharge
air temperature. If the demand for heat is at a point where the heat pump alone cannot maintain the desired duct
temperature, stored heat is used to supplement the heat pump and satisfy the heating requirements.
When the ThermElect system receives a “G” call, the supply air blower is energized; however, no heat is deliv-
ered as this is a “fan only” call.
When a “G” call is received with a “Y” call, the supply air blower is energized and the minimum discharge air
temperature (as set in Location 48) is targeted.
Anytime the ThermElect system receives a “W” call with any other call from the thermostat (except “O”) then
the maximum discharge air temperature (as set in Location 49) is targeted. The maximum discharge air tempera-
ture is also targeted if the current outdoor temperature (shown in Location 109) is lower than the off-peak lock out
temperature (set in Location 46) or the on-peak lockout temperature (set in Location 47).
Reference the Supplemental Installer's Guide for more information on system operation.
BRICK CORE CHARGE CONTROL
The amount of heat stored in the brick core of the Storage Module(s) varies in relation to outdoor temperature,
current building load, utility peak conditions, and/or the heating requirements. The outdoor sensor, supplied with the
system, monitors outdoor temperature and provides this information to the system. As the outdoor temperature
decreases, heating requirements increase and the system stores more heat accordingly.
CHARGE CONTROL OVERRIDE
If desired, the ThermElect 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 system, the indoor coil should be cleaned
periodically as dirt accumulation may reduce system efficiency. It is important to follow the manufacturer’s
maintenance and cleaning recommendations for these devices.
Operation