Table 11 - Routine Maintenance Plan For Critical Application And/Or Highly Aggressive Environment - Daikin EWAT016CZN-A1 Installation, Maintenance And Operation Manual

Air to water heat pump units with scroll compressors

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Table Of Contents

Table of Contents

List of Activities (Note 8)

General:

Reading of operating data (Note 3)

Visual inspection of unit for any damage and/or loosening

Verification of thermal insulation integrity

Cleaning

Paint where necessary

Analysis of water (4)

Check of flow switch operation

Electrical Installation:

Verification of control sequence

Verify contactor wear – Replace if necessary

Verify that all electrical terminals are tight – Tighten if necessary

Clean inside the electrical control board

Visual inspection of components for any signs of overheating

Verify operation of compressor and electrical resistance

Measure compressor motor insulation

Refrigeration circuit:

Check for any refrigerant leakage (leak test)

Analyze compressor vibrations

Hydraulic circuit:

Check for any water leakage

Check hydraulic connections

Check the pressure at the pump inlet

Clean the water filter

Check the glycol concentration

Check the water flow rate

Check the safety valve

Coil section:

Checking the cleaning of the air heat exchanger (Note 6)

Check the cleaning of water heat exchangers (Note 6)

Verify that fans are well tightened

Verify coil fins

BPHE:

Check the cleaning of the BPHE

Table 11 – Routine Maintenance Plan for Critical Application and/or Highly Aggressive Environment

Notes:

7. Monthly activities include all the weekly ones.

8. The annual (or early season) activities include all weekly and monthly activities.

9. Daily reading of the operating values of the unit allows maintaining high observational standards.

10. Check for any dissolved metals.

11. Clean condenser banks with clean water and water heat exchangers with appropriate chemicals. Particles and fibers could clog up the exchangers, especially for

water exchangers pay attention if water rich in calcium carbonate is used. An increase in pressure drops or a decrease in thermal efficiency means that the heat

exchangers are clogged. In environments with a high concentration of airborne particles, it might be necessary to clean the condenser bank more often.

12. Units placed or stored in a Highly Aggressive Environment for long time without operation are still subject to those routine maintenance steps.

EWYT~CZ / EWAT~CZ

Monthly

Weekly

(Note 1)