Suspended Solids In The Water; Removing Foreign Substances From The Water System; Connecting Pipes Made From Different Materials - Mitsubishi Electric CAHV-P500YA-HPB Service Handbook

[ II Restrictions ]

(5) Suspended solids in the water

Sand, pebbles, suspended solids, and corrosion products in water can damage the heating surface of the heat
exchanger and cause corrosion. Install a good quality strainer (20 mesh or better) at the inlet of the unit to filter
out suspended solids.

Removing foreign substances from the water system

Consider installing a settlement tank or a bypass strainer to remove foreign substances from the water system.
Select a strainer capable of handling two to three percent of the circulating water. The figure below shows a
sample system with a bypass strainer.
Strainer (20 mesh or its equivalent)

(6) Connecting pipes made from different materials

If different types of metals are placed in direct contact with each other, the contact surface will corrode.
Install an insulating material between pipes that are made of different materials to keep them out of direct
contact with each other.
HWE10060
Air conditioning unit
Heat pump unit
Water pump
Bypass strainer
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GB