WeatherMaster® High-Efficiency Single-Packaged Rooftop Units 50HC: Routine Maintenance (Monthly and Quarterly)

QUARTERLY INSPECTION (AND 30 DAYS AFTER INITIAL START)

• Return air filter replacement

• Outdoor hood inlet filters cleaned

• Condenser coil cleanliness checked

• Condensate drain checked

• Belt tension checked

• Belt condition checked

• Pulley alignment checked

• Fan shaft bearing locking collar tightness checked

To remove the filters:

• Grasp the bottom flange of the upper panel.

• Lift up and swing the bottom out until the panel disengages and pulls out.

• Reach inside and extract the filters from the filter rack.

• Replace these filters as required with similar replacement filters of same size.

To re-install the access panel:

• Slide the top of the panel up under the unit top panel.

• Slide the bottom into the side channels.

• Push the bottom flange down until it contacts the top of the lower panel (or economizer top).

REMOVE SURFACE LOADED FIBERS

• Surface loaded fibers or dirt should be removed with a vacuum cleaner.

• If a vacuum cleaner is not available, a soft non-metallic bristle brush may be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges can be easily bent over and damage to the coating of a protected coil) if the tool is applied across the fins.

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, tag disconnect

• Remove all screws from the top panel except the screws securing the condenser fan to the top panel. See Fig. 15.

• Lift and rotate the top panel at the condenser fan end and rotate the panel 90 degrees. Support the top panel so it remains level while resting on the condenser fan as shown in Fig. 16.

• Remove the compressor access panel to access the lower coil clip. The condenser coil corner post may also be removed.

• Remove the screws from both sides of the upper and lower coil retaining clips on the hairpin end of the coil tube sheets. See Fig. 17.

• Remove the upper and lower retaining clips.

• Draw the inner coil inward to separate the coils for cleaning.

• Insert a spacer (field-supplied) between the tube sheets to hold the coils apart. See Fig. 18.

• Clean the outer coil surface to remove surface loaded fibers or dirt. See “Remove Surface Loaded Fibers” on page 10 for details.

• Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and debris. If a coil cleaner is used be sure to rinse the coils completely before reassembly

• Move the inner coil back into position. Reinstall the lower and upper coil clips. Reinstall the top panel and replace all screws.

Totaline Environmentally Balanced Coil Cleaner Application Equipment

• 21/2 gallon garden sprayer

• Water rinse with low velocity spray nozzle

Totaline Environmentally Balanced Coil Cleaner Application Instructions

• Proper eye protection such as safety glasses is recommended during mixing and application.

• Remove all surface loaded fibers and dirt with a vacuum cleaner 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 balanced coil cleaner in a 21/2 gallon garden sprayer according to the instructions included with the cleaner. The optimum solution temperature is 100°F.

• NOTE: Do NOT USE water in excess of 130°F, as the enzymatic activity will be destroyed.

• Thoroughly apply Totaline environmentally balanced 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 Evaporator Coil:

• Turn unit power off. Install lockout tag. Remove evaporator coil access panel.

• If economizer or two-position damper is installed, remove economizer by disconnecting 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.