WeatherMaker® Standard Efficiency Single-Packaged Rooftop Units 50KC: Routine Maintenance (Quarterly and 30 Days after Initial Start)

QUARTERLY INSPECTION (AND 30 DAYS AFTER INITIAL START)

• Replace return air filter

• Clean outdoor hood inlet filters

• Check belt tension

• Check belt condition

• Inspect pulley alignment

• Check fan shaft bearing locking collar tightness

• Check outdoor coil cleanliness

• Check condensate drain

Avoid use of:

• coil brighteners

• acid cleaning prior to painting

• high pressure washers

• poor quality water for cleaning

CLEAN COIL AS FOLLOWS:

• Turn off unit power. Use lockout/tagout procedures on unit power switch.

• Remove top panel screws on outdoor coil end of unit.

• Remove coil corner post. See Fig. 12. To hold top panel open, place coil corner post between top panel and center post. See Fig. 13.

• For Sizes 04-06: Remove screws securing coil to compressor plate and compressor access panel.

• For Sizes 07-12: Remove fastener holding coil sections together at return end of condenser coil. Carefully separate the outdoor coil section 3 to 4 in. (7.6 to 10 cm) from the inner coil section. See Fig. 14.

• Clean the outer surfaces with a stiff brush in the normal manner. Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and debris.

• Secure inner and outer coil rows together with a field-supplied fastener.

• Reposition the outer coil section and remove the coil corner post from between the top panel and center post. Reinstall the coil corner post and replace all screws.

TOTALINE ENVIRONMENTALLY SOUND COIL CLEANER APPLICATION EQUIPMENT

• 2.5 gal (9.5 L) garden sprayer

• Water rinse with low velocity spray nozzle

TOTALINE ENVIRONMENTALLY SOUND COIL CLEANER APPLICATION INSTRUCTIONS

• Proper protection equipment, such as approved safety glasses and gloves, is recommended during mixing and application.

• Remove all surface loaded fibers and debris using a vacuum cleaner or a soft non-metallic bristle brush as described above.

• Thoroughly wet finned surfaces with clean water and a low velocity garden hose, being careful not to bend fins.

• Mix Totaline environmentally sound coil cleaner in a 2.5 gal (9.5 L) garden sprayer according to the instructions included with the cleaner. The optimum solution temperature is 100° F (38° C).

NOTE: DO NOT USE water in excess of 130° F (54° C), as the enzymatic activity will be destroyed.

• Thoroughly apply Totaline environmentally sound coil cleaner solution to all coil surfaces including finned area, tube sheets and coil headers

• Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Avoid spraying in horizontal pattern to minimize potential for fin damage.

• Ensure cleaner thoroughly penetrates deep into finned areas. Interior and exterior finned areas must be thoroughly cleaned. Finned surfaces should remain wet with cleaning solution for 10 minutes. Ensure surfaces are not allowed to dry before rinsing. Reapply cleaner as needed to ensure 10-minute saturation is achieved.

• Thoroughly rinse all surfaces with low velocity clean water using downward rinsing motion of water spray nozzle. Protect fins from damage from the spray nozzle.

CLEANING THE INDOOR COIL

• Turn unit power off. Use proper lockout/tagout procedures.

• Remove indoor coil access panel.

• If economizer or two-position damper is installed, remove economizer by disconnecting the Molex1 plug and removing mounting screws.

• Slide filters out of unit.

• Clean coil using a commercial coil cleaner or dishwasher detergent in a pressurized spray canister. Wash both sides of coil and flush with clean water. For best results, backflush toward return-air section to remove foreign material. Flush condensate pan after completion.

• Reinstall economizer and filters.

• Reconnect wiring.

• Replace access panels.