Mitsubishi Electric CMB-WP-V-GA1 Data Book page 151

3. SYSTEM DESIGN GUIDE
In order to keep the water quality within such standards,
you are kindly requested to conduct bleeding-off by
overflow and periodical water quality tests, and use
inhibitors to suppress condensation or corrosion. Since
piping may be corroded by some kinds of inhibitor,
consult an appropriate water treatment expert for proper
water treatment.
4) Pump interlock
Operating the heat source unit without circulation water
inside the water piping can cause a trouble. Be sure to
provide interlocking for the unit operation and water
circuit. Since the terminal block is being provided inside
the unit, use it as required.
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