Technical data

29
7.5.8 OCF & CFR Antifreeze function
OCF Range - On or Off ~ Default Off
CFR Range - -10°C to 10°C ~ Default 4°C
CFR is only available when OCF is set to On.
When OCF is set to On and the collector temperature falls below the set
CFR value the solar pump will be switched ON (R1 On). This has the effect
of the water from the cylinder warming the collectors to prevent freezing.
When the temperature of the collectors exceeds the set CFR value by 1°C
the pump is switched Off (R1 Off).
The solar system must always be filled with heat transfer fluid (glycol) at
the recommended solution. This will give protection of the system down to
- 28°C. Therefore the antifreeze function is not normally required in the UK.
7.5.9 OREC Re-cooling Function
OREC Range - On or Off ~ Default Off
When OREC is set to On and the maximum cylinder temperature (S MX) is
reached, the solar pump will continue to run (R1 On) to prevent the collectors
overheating. When the cylinder temperature falls back below the set S MX
the pump is switched Off (R1 Off). This prevents the collectors overheating,
ideal for hot summer days.
The re-cooling does increase the cylinder temperature, however it will only
rise up to 95°C, the cylinder emergency shut down temperature, at which
point the pump will be switched Off (R1 Off).
In the evening the pump continues to run until the cylinder is cooled to the
maximum set cylinder temperature (SMX).
7.5.10 OTC Collector Temperature Monitoring Function
OTC Range - On or Off ~ Default On
IMPORTANT
OTC must be set to On during commissioning and should not be
changed thereafter.
When OTC is set to On the controller monitors and stores the temperature
of the collectors as detected by sensor S1, whenever there is a temperature
rise of 2°C the solar pump will be switched On (R1 On) for a period of 30
seconds.
Collector Temperature Monitoring will occur between the set DTO and DTF
values - see 7.5.2 and 7.5.3.
7.5.11 OHQM Energy Monitoring
Range - On or Off ~ Default Off
For Energy Monitoring a sensor S4 has to be fitted - see 6.4 & 6.5.
Optional Sensor code: 3820003
Information only menu options KWh and MWh are only displayed when
Energy Monitoring function OHQM is On - see 7.4.6.
FMAX, MEDT and MED% and KWh are only displayed when Energy
Monitoring function OHQM is On - see over.
Note
For details of filling the system
with glycol see pump manual.
OCF
Off
CFR
4°C
OREC
OTC
On
Only when OCF is On
OHQM
Off
Off