Daikin Screw Chiller AWV018

WARNING: Prior to cleaning the unit, turn off and lock out the main power switch to the unit and close all access panels.

Maintenance consists primarily of the routine removal of dirt and debris from the outside surface of the fins.

Turned off and locked out the main power switch to the unit?

Select the tools used for cleaning

NOTE: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse.

Surface loaded fibers or dirt removed prior to water rinse?

High velocity water from a pressure washer or compressed air should only be used at a very low pressure to prevent fin and/ or coil damages. The force of the water or air jet may bend the fin edges and increase airside pressure drop. Reduced unit performance or nuisance unit shutdowns may occur.

Used high velocity water or compressed air at a very low pressure?

The following additional cleaning procedures are recommended as part of the routine maintenance activities for epoxy coated coils. Documented routine cleaning of epoxy coated coils is required to maintain warranty coverage.

Quarterly cleaning is essential to extend the life of an epoxy coated coil and is required to maintain warranty coverage. Coil cleaning shall be part of the unit’s regularly scheduled maintenance procedures. Failure to clean an epoxy coated coil will void the warranty and may result in reduced efficiency and durability in the environment.

For routine quarterly cleaning, first remove surface debris and then clean the coil with an approved coil cleaner (see approved products list in Table 55). After cleaning the coils with the approved cleaning agent, use the approved chloride remover to remove soluble salts and revitalize the unit.

The following cleaning agents, assuming they are used in accordance with the manufacturer’s directions on the container for proper mixing and cleaning, have been approved for use on epoxy coated coils to remove mold, mildew, dust, soot, greasy residue, lint and other particulate:

CHLOR*RID DTSTM should be used to remove soluble salts from the epoxy coated coil, but the directions must be followed closely. This product is not intended for use as a degreaser. Any grease or oil film should first be removed with the approved cleaning agent.

1. Remove Barrier - Soluble salts adhere themselves to the substrate. For the effective use of this product, the product must be able to come in contact with the salts. These salts may be beneath any soils, grease or dirt; therefore, these barriers must be removed prior to application of this product.

As in all surface preparation, the best work yields the best results.

2. Apply CHLOR*RID DTS - Apply CHLOR*RID DTS directly onto the substrate. Sufficient product must be applied uniformly across the substrate to thoroughly wet out surface with no areas missed. This may be accomplished by use of a pump-up sprayer or conventional spray gun.

Complete unit log and review. Log readings can be taken daily for a higher level of unit observation.

Electrical (including the VFDs)

Clean control box fan filter. The weekly fan filter cleaning schedule can be modified to meet job conditions. It is important that the filter allows full air flow.

Check liquid line sight glasses for clear flow

Check compressor oil sight glass for correct level (lubricant charge);

- Water strainer installed on evaporator, 0.125” (3.2mm) or smaller perforations

- Water System filled, flushed and vented

- Pumps installed and operational (rotation checked, strainers cleaned)

- Controls operational (3-way valves, face/bypass dampers, bypass valves, etc.)

- Water system operated and tested; flow meets unit design requirements

- Flow switch installed and wired

Annual (or spring startup) operations include all weekly and monthly operations.

- Inspect thermal insulation for integrity

Electrical ( * including the VFDs):

- Check contactors for pitting, replace as required

- Check terminals for tightness, tighten as necessary