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Benefit
Description
Setting
Note
Benefit
Description
Setting
Effect
Note
Siemens Building Technologies
HVAC Products
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
0...60
If the return temperature drops below the minimum limit (operating line 401
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
0 / 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.
Basic Documentation RVP540 / RVP550
Description of the EXP settings
Unit
Factory setting
min
15
Unit
Factory setting
–
1
), the
EXP
303/348
CE1P2488en
18.10.2002
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