70
Monobloc Outdoor Unit Installation Manual
•
The electric heaters are de-energized if OAT is above the AntiFreezeDeltaSetpoint* [P517] + 7.0 °C or if both
EWT (if configured) and LWT are higher than AntiFreezeDeltaSetpoint* [P517] + 4.5 °C.
•
The electric heaters are energized if either alarm #50 or alarm #51 is active and can still automatically be reset
* Modifying the pre-configured value is at the user’s responsibility.
Never switch off the unit, otherwise freeze protection cannot be guaranteed. For this reason the main unit
and/or customer circuit disconnect switch must always be left closed.
If a shut-off valve is installed, a bypass must be included as shown below:
Winter position for unit with hydronic module:
Winter position for unit without hydronic module:
IMPORTANT: Depending on the atmospheric conditions in your area you must do the following when
switching the unit off in winter:
•
Add ethylene glycol or propylene glycol with an adequate concentration to protect the installation up to
a temperature of 10 K below the lowest temperature likely to occur at the installation site
•
If the unit is not used for an extended period, it should be drained, and ethylene glycol or propylene
glycol should be charged in the heat exchanger as a safety precaution, using the water inlet purge
valve connection
•
At the start of the next season, refill the unit with water and add an appropriate inhibitor.
•
For the installation of auxiliary equipment, the installer must comply with basic regulations,
especially for minimum and maximum flow rates (section 7.6 & 7.7)
•
To prevent corrosion by differential aeration, the complete drained heat transfer circuit must be
charged with nitrogen for a period of one month. If the heat transfer fluid does not comply with the
manufacturer regulations, the nitrogen charge (0.5Bar Max) must be added immediately
•
If frost protection is dependent on electric trace heaters, never switch off their power
Unit
Open
Closed
Closed
Water loop
Unit
Open
Closed
Closed
Water loop
