Daikin EWWD VZ Series, Installation, Maintenance And Operating Manual

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Temperature limits and water flow
The EWWD VZ units are designed to operate with an evaporator outlet water temperature between -3° C and
+20° C and a condenser outlet water temperature between 15° C and 50° C (standard units) and between 15° C
and 65° C in case the "High Temperature" kit is installed. However, the minimum temperature difference
between the evaporator outlet water temperature and the condenser inlet water temperature must not be less
than 15° C. Always check the exact operating point with the selection software. Some simultaneous operating
conditions (high evaporator inlet water temperature and high condenser inlet water temperature) may be
inhibited.
Glycol must be used for all applications with the evaporator outlet fluid below 4° C. The maximum permissible
water temperature in the evaporator with the machine off is 50° C. Higher temperatures could cause the safety
valves on the evaporator sleeve to open.
Water flow rate under the minimum value indicated in the condenser and evaporator load loss diagram can
cause freezing problems, incrustations and poor control. Water flow rate higher than the maximum value
indicated in the condenser and evaporator load loss diagram results in an unacceptable load loss and excessive
erosion of the pipes and vibrations that can cause breakage.