Checking the set values and adjusting, if required
Note
For adjustments of the set values, see from page 31.
Heating mode
*
1
*
2
Return temperature (HEA):
max. 45.0 °C (standard setting 40.0 °C)
Flow temperature:
Return temperature
plus
5 to 8 K
Cooling mode
*
3
Return temperature (Coo):
approx. 12.0 °C (standard setting 12.0 °C)
Flow temperature:
Return temperature
less
5 to 8 K
Checking superheating and correcting, if required (cooling
mode)
The unit is equipped with a thermostatic expansion valve with external pressure
compensation. At the factory, the expansion valve is set to 5 K superheating.
Checking the superheating
To ensure adequately accurate test
values, start the unit at least 5 min-
utes before the test is started.
1.
Determine the low pressure with
the pressure gauge attached to the
inlet side of the service valve (see
Fig. on page 6).
2.
Using the temperature scale of the
pressure gauge, determine the
saturation temperature of the inlet
side (Tse) that corresponds to this
pressure.
3.
Place a contact thermometer at the
outlet connector of the evaporator
and determine the effective tem-
perature (Tsa).
4.
Calculate superheating S from
Tse
–
Tsa.
5.
Record the determined values in
the service report from page 39.
Adjusting the superheating
1.
Rotate the adjusting screw of the
thermostatic expansion valve by up
to ½ turn.
2.
Let the unit run for at least 5 min.
Further details regarding the individual steps
(cont.)
18
Commissioning, inspection, maintenance
5692
695
GB
*1
Relative to an outside temperature of 7 °C.
*2
Only for type OC208HM (heat pump version).
*3
Relative to an outside temperature of 35 °C.
Summary of Contents for OC208HM
Page 28: ...A Continued see page 29 Menu structure overview 28 Control settings 5692 695 GB ...
Page 45: ...45 5692 695 GB ...
Page 46: ...46 5692 695 GB ...
Page 47: ...47 5692 695 GB ...
