Twcool
3004
Cact
T
t
B91
Cpas Cact
B91 Source inlet sensor
Twcool Cooling setpoint
3004 SD ch’over cooling pas/act
Cact Active cooling mode
Cpas Passive cooling mode
T Temperature
t Time
This determines whether passive cooling is permitted when the compressor is in
operation (e.g. for DHW charging).
During compressor
operation
Passive cooling off
Passive cooling is locked during the time the compressor operates.
Passive cooling on
Passive cooling is released during the time the compressor operates.
This defines the behavior of the condenser pump in passive cooling mode.
In passive coo
ling mode
Condenser pump off
The condenser pump remains deactivated during passive cooling mode.
Condenser pump on
The condenser pump remains activated during passive cooling mode.
To obtain the return temperature setpoint for active cooling mode, the current flow
temperature setpoint (according to the cooling curve) is increased by the value set
here.
Temp diff cond
cooling mode
If the setting = 0 in the case
of plants with return temperature control, the cooling curve
must be based on the return (plants with pump heating circuits and without buffer or
combi storage tanks).
Sensor calibration.
The sensor calibration function corrects the two heat pump sensors B21 (flow) and B71
(return) with the following parameters and calibrated against one another.
The temperature difference between flow and return sensors must be calibrated against
one another due to the relative large sensor tolerance if used to determine expended
energy. The calibration must be conducted on the sensors actually used in the plant.
The sensors should be calib
rated at a temperature level of between 20°C and 40°C
where possible. The deviation of both sensors and the required correction value should
normally be < 1°K and cannot exceed 2°K.
137/258
Siemens Switzerland Ltd User manual RVS61.843, RVS41.813 CE1U2355en_02
HVAC Products 6 The settings in detail 28. September 2009
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