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This timer function allows for a means of providing a forced air priority over all hydronic zones. The value
entered is used for the timer which starts with the forced air thermostat. Once this timer expires, the
hydronic load is interrupted and the buffer tank energy is dedicated fully in an attempt to satisfy the forced
air coil demand. Once the forced air thermostat has been satisfied, the hydronic zones can again receive
heat energy from the buffer tank. The timer will begin once again on the next forced air thermostat heat
call.
NOTE: The COIL PRIORITY jumper must be removed to activate this timer.
Factory default is 60 minutes
W Call - Safety Run Time (SOT)
During a forced air heat call, there is potential for issues to arise within the heating system that are
undetectable via the buffer tank sensors. An example would be an incorrectly calibrated sensor. A timer
known as "W Call – Safety Run Time (SOT)" is used to detect such an issue. If this timer expires before
the heat call is satisfied, the buffer tank controller will go into an error mode delivering a portion of heat to
the space. The HP-Y1 output is also cycled ON/OFF every 15 minutes. HP-Y2 output is turned off.
Factory default is 90 minutes
Zone Call - Safety Run Time (SOT)
During a hydronic zone heat call, there is potential for issues to arise within the heating system that are
undetectable via the buffer tank sensors. An example would be an incorrectly calibrated sensor. A timer
known as "Zone Call – Safety Run Time (SOT)" is used to detect such an issue. If this timer expires
before the heat call is satisfied, the buffer tank controller will go into an error mode delivering a portion of
heat to the space. The HP-Y1 output is also cycled ON/OFF every 15 minutes. HP-Y2 output is turned off.
Factory default is 240 minutes
HP 2 Stage
This informs the controller if the system heat pump is the 2-stage type. Select 'YES' or 'NO'.
Cool
This is in regards to the forced air heating and cooling aspect of the HVAC system focusing on the
operation of the "coil pump". The coil pump operates as such:
Upon heating or cooling call from the forced air thermostat:
• If the buffer tank (BT) temperature is greater than or equal to 60°F (16°C) and less than or equal to
80°F (27°C), the coil pump is disabled.
• If the BT temperature is outside of this range the coil pump is enabled.
Heat Mode Target Temperature:
This is the temperature the program is maintaining in the buffer tank when in a heating mode.
• If the front panel 'TANK TEMPERATURE DIAL' switch is in the SET POINT position, the target
temperature is determined by the 'WARM AIR' switch setting.
• If the 'TANK TEMPERATURE DIAL' switch is in position HI, MED or LO, the target temperature is the
internally calculated value from the actual OT, this switch setting, and the WarmFlo ramp-up curve.
Buffer Tank Controller Software Version
This is the current board software version and the mode the board is in.
The MODE dial switch is read only on a power up.
02/22/2012
15
HI114
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