Carrier AQUASNAP 30RBM Series Installation, Operation And Maintenance Instructions page 34

IMPORTANT:
Depending on the atmospheric conditions in your region, you need to:
• Add an appropriate antifreeze solution (maximum of 45%) to protect the system down to a temperature of 10 K below
the lowest temperature likely to occur locally.
• For extended shut-downs, drain and add an anti-freeze solution to the heat exchanger (use the drain valve located at the
water inlet).
• To prevent corrosion due to differential aeration, if the system is to be empty for more than 1 month, the heat-transfer
fluid circuit should be protected with a blanket of neutral gas (0.5 bar maximum). If the heat-transfer fluid does not meet
the recommendations, a nitrogen blanket must be applied immediately.
• At the start of the next season, refill the unit with water and add an inhibitor.
• If additional equipment is added to the system, the installer must comply with the basic recommendations, especially the
minimum and maximum flow rates which must be between the values shown in the operating limits table (application
data).
• If frost protection is dependent on electric heaters, never de-energize the unit when frost protection is required. To ensure
protection, the main unit disconnect switch and the auxiliary heater protection circuit breaker must be closed (see wiring
diagram to locate these components). If it is not to be used in freezing conditions, or during a prolonged period without
power (whether or not this is scheduled), the water type heat exchanger and external pipes must be drained immediately
• In case of prolonged non-usage, the hydraulic circuits must be protected by circulating a passivating solution. (Consult a
specialist).
• The heat exchanger temperature sensors are an essential frost protection element: if piping trace heaters are used, ensure
the external heaters do not affect the measurements provided by these sensors.
• If auxiliary equipment is installed in the system, the installer must ensure that the resultant flow rates are still within the
minimum and maximum values indicated in the operating limits table (application data).
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