High Water Temperature Alarm - Carel pRack pR300T Mode D'emploi

2.6 High water temperature alarm

A maximum allowed water temperature value can be specified for safety reasons. If the heat exchanger
outlet temperature exceeds the set threshold, heat recovery will be deactivated. The differential represents
a hysteresis for resetting the alarm.
2.7 Discharge temperature control
If heat recovery is active, the discharge temperature is lowered in proportion to the capacity required for
heat recovery.
Tdisch Twi
T
To prevent heat recovery from excessively cooling the CO2, a function can be activated that calculates the
difference between the readings of the discharge temperature probe and a reference probe (heat exchanger
water inlet or outlet temperature), deactivating heat recovery when this value exceeds a set point for a
certain set period.
The function can be activated independently for both heat recovery modes.
The operating logic can be summarised as follows:
•
If both temperature probes are configured (Twi and Two)
–
Temperature delta = Tdisch - Two if the reference probe is Two
–
Temperature delta = Tdisch - Twi if the reference probe is Twi
•
If only probe Two is configured as the reference probe
–
Temperature delta = Tdisch - Two
•
If only probe Twi is configured as the reference probe
–
Temperature delta = Tdisch - Twi
Two Tdisch 2 Twi
T
Fig. 2.d
13
ENG
Two
cod. +030220595 - 1.2 - 13.08.2020