Blue Box - 32
4.7 HEAT RECOVERY EXCHANGER HYDRAULIC CONNECTIONS (Version /DC)
For all units equipped with a heat recovery condenser, the hydraulic circuit connections are male threaded steel
pipes.
These units are equipped with a sensor monitoring the temperature of water returning from the system.
The microprocessor controller enables heat recovery when required, and restarts regular operation once the
water has reached the setpoint temperature.
If faults occur on the recovery condenser the microprocessor controller restarts the cooling through the condenser.
The calibration values of the thermostat and pressure switches are given in the specific controller instruction
manual.
4.6 DESUPERHEATER HYDRAULIC CONNECTIONS (optional)
For units provided with desuperheaters it is recommended that a pressostatic or three way modulating valve is
installed with a temperature sensor fitted on the condenser water inlet.
The water inlet and outlet must be connected in the positions indicated as labelled on the unit.
In this way the system will be kept under optimal operating parameters. See paragraph 4.5.
In HP version units the hydraulic connections of the desuperheater must
be isolated when working in heat pump mode.
To ensure that the unit operates at optimal parameters in the heat recovery mode, the condensing temperature
must be maintained at around 53 °C. The leaving water temperature from recovery condenser must be between
the limits of the "OPERATING LIMITS" diagram (T min. out = 25 °C, T max out = 50 °C).
Water flow to the main condenser and recovery condenser must be controlled in order to obtain the set recovery
temperature and always maintain the condensing pressure higher than 12.5 bars.
The hydraulic circuits to main condenser and recovery condenser will therefore have variable water flows.
To keep the condensing pressure higher than 12.5 bars, two possible solutions are suggested:
- with pressostatic valve (See figure 7)
- with 3 way valve (See figure 8)
ACQUA DESURRISCALDATORE
The water inlet and outlet must be connected in the positions indicated
as labelled on the unit.
ACQUA RECUPERO
RECOVERY WATER
OUT
ACQUA DESURRISCALDATORE
WATER DESUPERHEATER
OUT
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