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DN-Series Integrated Programmable Controls
DOAS
56
6.5.1.4 Heat Pump 1-Stage Auxiliary Heat
The unit allows you to use an 0–10VDC auxiliary heat source when the outdoor temperature is
very cold. It will run a PI control to maintain the heat setpoint with the aux heat instead of the
heat pump. If you have an auxiliary 0–10VDC heat source:
u
Set the
Aux Heat Src?
To YES
u
Set the outdoor temperature at which the unit will change from using the heat pump to
aux heat.
u
Adjust the KP and Ti for the PI loop, if necessary.
6.5.1.5 Heat Pump 1-Stage Reversing Valve
The reversing valve controls which direction the refrigerant flows. On change of mode
(i.e. cool to heat), there will be a delay before the compressor turns on to allow the valve to
come into position.
Reversing valve settings:
u
Delay: This is the delay between the heating and cooling changeover where the compressor
will not be turned on to allow the valve to get into position.
u
Contact Open: Choose to have the contact open in heat or cool.
6.5.1.6 Heat Pump 1 Stage System Monitoring
The heat pump is monitored with heating and cooling screens as well as a reversing valve
screen and if auxiliary heat is enabled, a screen showing its status.
TEMPERING CONTROL
