Carrier WeatherMaster 48HC04 Service And Maintenance Instructions

Also see for WeatherMaster 48HC04 Series: Installation instructions

13Fig. 18 — Separating Coil Sections6. Use a water hose or other suitable equipment to flushdown between the 2 coil sections to remove dirt anddebris. Clean the outer surfaces with a stiff brush in thenormal manner.7. Secure inner and outer coil rows together with a field-sup-plied fastener.8. Reposition the outer coil section and remove the coil cor-ner post from between the top panel and center post. Rein-stall the coil corner post and replace all screws.TOTALINE ENVIRONMENTALLY SOUND COILCLEANER APPLICATION EQUIPMENT• 2 1/ 2 gallon garden sprayer• Water rinse with low velocity spray nozzleTOTALINE ENVIRONMENTALLY SOUND COILCLEANER APPLICATION INSTRUCTIONS1. Proper eye protection such as safety glasses is recom-mended during mixing and application.2. Remove all surface loaded fibers and dirt with a vacuumcleaner as described above.3. Thoroughly wet all finned surfaces with clean water and alow velocity garden hose, being careful not to bend fins.4. Mix Totaline environmentally sound coil cleaner in a21 /2 gallon garden sprayer according to the instructionsincluded with the cleaner. The optimum solution tempera-ture is 100°F.NOTE: Do NOT USE water in excess of 130°F, as the enzymaticactivity will be destroyed.5. Thoroughly apply Totaline environmentally sound coilcleaner solution to all coil surfaces including finned area,tube sheets and coil headers.6. Hold garden sprayer nozzle close to finned areas and applycleaner with a vertical, up-and-down motion. Avoid sprayingin horizontal pattern to minimize potential for fin damage.7. Ensure cleaner thoroughly penetrates deep into finnedareas. Interior and exterior finned areas must be thor-oughly cleaned. Finned surfaces should remain wet withcleaning solution for 10 minutes. Ensure surfaces are notallowed to dry before rinsing. Reapply cleaner as neededto ensure 10 minute saturation is achieved.8. Thoroughly rinse all surfaces with low velocity cleanwater using downward rinsing motion of water spray noz-zle. Protect fins from damage from the spray nozzle.Evaporator CoilCLEANING THE EVAPORATOR COIL1. Turn unit power off. Install lockout tag. Remove evapora-tor coil access panel.2. If economizer or two-position damper is installed, removeeconomizer by disconnecting Molex plug and removingmounting screws.3. Slide filters out of unit.4. Clean coil using a commercial coil cleaner or dishwasherdetergent in a pressurized spray canister. Wash both sidesof coil and flush with clean water. For best results, back-flush toward return-air section to remove foreign material.Flush condensate pan after completion.5. Reinstall economizer and filters.6. Reconnect wiring.7. Replace access panels.THERMOSTATIC EXPANSION VALVE (TXV)All 48HCs have a factory-installed nonadjustable thermostatic ex-pansion valve (TXV). The TXV will be a bi-flow, bleed port ex-pansion valve with an external equalizer. TXVs are specificallydesigned to operate with Puron® or R-22 refrigerant. Use only fac-tory authorized TXVs. Do not interchange Puron and R-22 TXVs.TXV OperationThe TXV is a metering device that is used in air conditioning andheat pump systems to adjust to the changing load conditions bymaintaining a preset superheat temperature at the outlet of theevaporator coil.The volume of refrigerant metered through the valve seat is de-pendent upon the following:1. Superheat temperature is sensed by cap tube sensing bulb onsuction tube at outlet of evaporator coil. This temperature isconverted into pressure by refrigerant in the bulb pushingCAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in reduced unit perfor-mance or unit shutdown.High velocity water from a pressure washer, garden hose, orcompressed air should never be used to clean a coil. The forceof the water or air jet will bend the fin edges and increase air-side pressure drop.CAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in acceleratedcorrosion of unit parts.Harsh chemicals, household bleach or acid or basic cleanersshould not be used to clean outdoor or indoor coils of any kind.These cleaners can be very difficult to rinse out of the coil andcan accelerate corrosion at the fin/tube interface wheredissimilar materials are in contact. If there is dirt below thesurface of the coil, use the Totaline environmentally balancedcoil cleaner.