HRX-OM-X010
Chapter 7 System Maintenance
HRZ Series 7.3 Storage
7.2.2 Quarterly inspection
Table 7-3 Quarterly Inspection
Circulating fluid is to be drained for check.
Fluid should be free of particles, moisture
*1
and foreign
substances.
For ethylene glycol solution, confirm that the concentration falls
within the specified range.
Recommended to replace the water.
Facility water quality should fall within the standards specified.
Ventilation hole and
electrical parts
No particles and dust should be present.
7.3 Storage
The following should be performed for system long-term storage.
1. Drain the circulating fluid. See section 7.3.1 “Draining of circulating fluid out of tank” for details on
page 7-4.
2. Drain the facility water. See section 7.3.2 “Draining of facility water” for details on page 7-5.
3. Cover the system with a plastic sheet for storage.
Quarterly inspection requires an advance lockout/tagout of this
system. See section 1.5.3 “Lockout/Tagout” in “Chapter 1 Safety” for
details on page 1-10.
Moisture trapped in the fluorinated fluid (*1) freezes in the heat
exchanger element and piping, which may lead to system failure.
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