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Outdoor (OT) and Buffer Tank (BT) Temperatures
These are the "read only" values read from the sensor and adjusted with their offsets. They are updated only
when a Read Data (Alt+R) is performed.
Note: This can be monitored, along with the Target Temperature, by selecting Monitor Data (Alt+M)
from the Communications menu.
OT Temperature Heating - HI
This setting is applicable with two stage heat pumps only. The purpose of this setting is to allow for the
heat pump to enter into second stage heating based on outdoor temperature.
System sequence:
• Outdoor temperature < OT Temperature Heating –HI = Stage one of the heat pump will be on upon
heat call from room thermostat. Stage two heat pump will turn on as a function of timeout (SOT TIME
DIAL)
• Outdoor temperature > OT Temperature Heating – HI = Stage two heat pump is on upon initial heat
demand.
Factory default is 20°F.
OT Temperature Heating - LO
This function is not applicable and should be ignored
OT Temperature Cooling - HI
This setting is applicable with two stage heat pumps only. The purpose of this setting is to allow for the
heat pump to enter into second stage cooling based on outdoor temperature.
System sequence:
• Outdoor temperature < OT Temperature Cooling – HI = Stage one of the heat pump will be on upon cool
call from room thermostat. Stage two heat pump will turn on as a function of timeout (SOT TIME DIAL)
• Outdoor temperature > OT Temperature Cooling – HI = Stage two heat pump is on upon initial cool
demand.
Factory default is 90°F.
BT Differential
After a heating or cooling demand has been initated, this temperature is used to develop an operating range
at which the actual tank temperature will be kept. The smaller the value the "tighter" the tank temperature
will be. The larger the number, the "wider" the operating temperature will be. This must be set with
application and heat pump cycling in mind.
Cool Mode Target
After a thermostat cooling call has been iniated, the buffer tank sensor will be referenced and compared to
this value. If the tank temperature is greater than or equal to this temperature, the buffer tank controller will
signal to the heat pump to begin cooling. If it is less than this value, the tank temperature will be considered
ideal for cooling mode operation and the heat pump will not be turned on.
Maintain Tank Target Less Than OT
This function determines the outdoor temperature at which the buffer tank controller will go into a "hot
tank" temperature mode. When in heating mode and above this value, the heat pump will not turn on unless
there is an active demand for heat from a room thermostat, regardless of buffer tank temperature. When
below this outdoor temperature, the buffer tank controller will work to maintain a "hot tank" and maintain
tank set point regardless of room thermostat demand.
Coil Priority Time
02/22/2012
14
HI114
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