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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
5.37 Minimum compressor off time
•
Prevents premature switching on of compressor after shutdown
Frequent switching on / off of compressor causes wear and tear. For this reason – after
shutdown – the controller will switch on the compressor not before the off time defined
here has elapsed.
Setting range
Unit
Factory setting
0...60 min
15
If the return temperature drops below the minimum limit (operating line 401
EXP
), the
compressor will be switched on, even if the minimum compressor off time has not yet
elapsed.
5.38 Automatic switch-on attempt after heat pump
fault 135 and 137
•
Automatic restart attempt after fault has occurred
The error messages “Water / brine sensor temperature too low” (error message 135 on
operating line 50) and "Feedback signal missing" (error message 137) will automatically
be reset (acknowledged) after 6 hours.
Setting range
Unit
Factory setting
0 / 1
–
1
The settings have the following meaning:
0
Automatic switch-on attempt not activated
1
Automatic switch-on attempt activated
After automatic reset (acknowledgement) of the 2 error messages, the heat pump will
again attempt to resume operation.
This can be of advantage if the environmental conditions (e.g. too low temperatures in
the water / brine circuit) that have caused the fault have in the meantime changed.
Error messages 135 and 137 can also be reset manually (refer to operating line 75).
If setting 0 has been selected (automatic switch-on attempt not activated), the error can
only be reset manually.
Benefit
Description
Setting
Note
Benefit
Description
Setting
Effect
Note
