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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
In the following situations, the integral is set to 0:
• No valid temperature request delivered
• Setpoint change > 2 K
• Frost protection for the HP is active
• The heat pump has gone to lockout or cannot deliver any heat for a longer
period of time
• The heat pump is in active cooling mode
• A buffer storage tank is being charged
• Function is deactivated
With active DHW charging, the integral value is frozen in.
In the following example of compensation, excess heat occurs during the minimum
compressor on time. Excess heat is reduced again on completion of the set minimum
compressor off time in that the compressor will not yet be released:
0
1
WP
T
2842 2843
t
T
VL/RL
x
Comp
T
VL/RL
w
2355_169aZ01
T
VL / RL
x Actual value of flow or return temperature
T
VL / RL
w Flow or return temperature setpoint
2842 Compressor run time min
2843 Compressor off time min
WP Heat pump switching state: 0 = off, 1 = on
Comp Compensation of excess heat resulting from on time
This number determines how many times DHW charging or forced buffer storage tank
charging may be aborted until either the electric immersion heater in the flow or that in
the DHW storage tank completes the charging process.
The compressor is switched off if the 3-phase current error is constantly present for the
period of time set here. On completion of the “Minimum off time“, the heat pump is
switched on again. If, within “Duration error repetition”, the 3-phase current error occurs
again for at least the delay time, the heat pump will initiate lockout, if the permitted
preset number of faults has been exceeded.
The compressor is switched off if the flow switch signal is constantly present during the
period of time set here. On completion of the “Minimum off time“, the heat pump is
switched on again. If, within “Duration error repetition”, the flow switch trips again, the
heat pump initiates lockout, if the permitted preset number of faults has been
exceeded.
If the relevant input EX1 – EX7 is configured for use with a pressure switch, a fixed
delay of 3 seconds applies.
The heat pump is released only when the composite outside temperature lies above the
value set here. Below this outside temperature level, the amount of heat required must
be delivered by some other heat source (bivalent operation). This prevents poor
efficiency and thus uneconomical operation of the heat pump.
Number of DHW charging
attempts
Delay 3-ph current error
Delay flow switch
source / consumers
Release above OT
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