20
SLS/SLH 10/06
9
CONDENSER FAN CONTROL
IN HEATING WITH FSC
Two parameters used: Low Air Temp Heating and High
Air Temp Heating.
If the Tair probe is installed, fan control in heat pump
mode is always based on ambient temperature and not
pressure. At unit startup, the fans will run for 3 seconds
at max speed before the compressor starts.
After startup, the fans will run according to the following
rule:
If Tair < Low Air Temp Heating then AO = Max Fan Speed
If Low Air Temp Cooling < Tair < High Air Temp Cooling then AO from Max to Min with
linear progression
If Tair > High Air Temp Heating then AO = Min Fan Speed
If Air Temp Probe (B4) isn’t installed, the Analogue
Output is forced to the 10Vdc value. The Fan relay is
energized whenever at least one compressor is running.
If High pressure transducer are installed, during the
defrost cycle, the fans will turn on at 20Bar and run at
50%. AO = 5Vdc. The fans will stay on until the higher
discharge pressure drops to 15 Bar, and then they will
turn off.
Summary of Contents for SLS-SLH
Page 1: ...Chiller unit SLS SLH...
