Danfoss RET 230 HC-1, Installation Instructions Manual

Page: 7 / 76

7
GB - Installation Instructions
Switch 7 : Active only if switch 8 is set to Chrono. This
switch determines the number of cycles per hour
that the thermostat will impose on the system,
the options are three 20 minute cycles or six 10
minute cycles.
Switch 6 : Allows Celsius or Fahrenheit temperature scaling
to be selected.
Switch 5 : Enables or disables a compressor delay timer
which is activated at the end of each cooling call.
This feature need only be used where cooling is
provided by a compressor as opposed to chilled
water. Set to Cmp del if a compressor delay is
required, otherwise leave set to No Cmp del.
Switch 4 : Active only if switch 5 is set to Cmp del. The op-
tions are 3 or 4 minutes.
Switch 3 : Allows dead-band between heating and cooling to
be set, options are 2°C or 4°C.
Switch 2 : Allows application to set as fan coil or as heat
pump. If heat-pump is selected, the output
normally used to operate the heating valve is
re-assigned to the heat-pump reversing valve,
the compressor stop/start signal for both heat
and cool calls is re-assigned to the relay normally
used to operate the cooling valve.
Switch 1 : The function of this switch is dependent upon the
setting of switch 2:
Switch 2 set to Heat-pump : allows the reversing valve to
be set up to be energised in heating mode (R+), or
energised in cooling mode (R-)