TLR-D5P-U Engineering Manual
Doc: 70-07-0100, V2.2, Date: 20090201
©2008 Vector Controls
Page 12
Switching Delays
Delay switching off:
Using this delay will prevent rapid switching of the compressor. After switching on, the compressor will only switch off
after the delay switching off time is expired. The selectable range is 0…255 seconds.
Delay switching on:
Using this delay will prevent rapid switching of the compressor. After switching off, the compressor will only restart
after the delay switching on time is expired. The selectable range is 0…255 seconds.
Delay on heat / cool change:
For 4-pipe systems only: This delay prevents rapid switching of heating and cooling. The selectable range is 0…255
minutes. The switching on delay will be reset after a heat - cool change. This will allow a reversing valve to open
before a compressor starts. Enough time will therefore be required for the delay-on parameter.
Delay on reversing valve
For systems with reversing valve, it is required to set the fan on delay long enough for the reversing valve to open /
close. The reversing valve is activated together with the fan.
Fan delay
Once there is an output demand, the fan will activate first, wait the required start delay time and then activate the
control output. This will ensure stable air for heating or cooling and for the reversing valve to run to the correct
position before the compressors are started.
The control output will be switched off when the setpoint is reached. The fan keeps running until stop delay has
expired. This delay prevents overheating and condensation on the coils.
Controls Output
Fan Output
Demand
CP20
CP21
Time [s]