Trane Stealth™ Air-Cooled Chiller SCWH1203

Verify the fan motor is properly aligned and bolted tight to the motor frame.

With power disconnected, manually rotate the fan wheel to check for obstructions in the housing or interference with fan blades. Remove obstructions and debris. Center the fan wheel if necessary.

Check the fan assembly sheave alignment. Tighten set screws to their proper torques.

Note: Perform this procedure monthly if the unit is in a coastal or corrosive environment.

Sign off on the chiller maintenance

WARNING: Hazardous Chemicals! Coil cleaning agents can be either acidic or highly alkaline. Handle chemical carefully. Proper handling should include goggles or face shield, chemical resistant gloves, boots, apron, or protective suit as required. For personal safety, refer to the cleaning agent manufacturer’s materials safety data sheet and follow all recommended safe handling practices. Failure to follow all safety instructions could result in death or serious injury.

Remove panels from the unit to gain access to the coil.

Use a soft brush to remove loose dirt and debris form both sides of the coil.

Straighten coil fins with fin comb as required.

Mix the detergent with water according to the manufacturers instructions. Observe all recommendations of the cleanser manufacturer. The coil cleanser manufacturer’s recommendations, warnings and cautions will at all times take precedence to these instructions.

Place solution in the sprayer. Be sure to follow these guidelines if using a high-pressure sprayer: a) Keep minimum nozzle spray angle 15°. b) Spray solution at a 90° angle to the coil face. c) Keep sprayer nozzle at least six inches from the coil. d) Sprayer pressure must not exceed 600 psi.

Spray leaving air side of the coil first then spray the entering air side of the coil. Allow the detergent and water solution to stand on the coil for five minutes.

Rinse both sides of the coil with cool, clean water.

Remove all mid and top fan section panels

Loosen the brackets inside the unit that clamp the mid and fan sections together

Remove the control box cover and disconnect the motor power wires. Feed wires up through the unit and secure out of the way until rotation is complete

Rotate the fan section to desired position

Re-route the motor power wires back to the control box. Ensure all wiring is free and not routed over any sharp edges

Reconnect the motor power wires per the unit wiring diagram

Bolt and/or clamp all brackets back into place

Replace control box cover and all exterior panels

Verify the fan rotation and motor amp draw

WARNING: Hazardous Voltage! Disconnect all electrical power including remote disconnects before servicing unit. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

Inspect unit air filters. Clean or replace if airflow is blocked or if filters are dirty.

Inspect coils for icing. Icing on the coils may indicate low airflow supply, restricted airflow from dirty fins.

Check the fan belt condition and tension. Adjust tension if belt is floppy or squeals continually.

Check and record operating pressures.

Sign off on the monthly maintenance

Uncrate the plenum and accessory bag.

Rotate the evaporator blower to the vertical discharge configuration.

Apply the soft gasket provided around the aluminum frame on top of the unit as shown in Figure I-IP-1.

Using a screwdriver, tighten the self-drilling screws as shown in Figure I-IP-1. Be sure to tighten all screws on the rear, right, and left sides through the pilot holes on the plenum panels.

When installation is complete, adjust the motor pulley and the discharge grille for proper airflow.

Sign off on the plenum installation