Carrier 48TCA04---A12 appendix Evaporator Coil, Refrigerant System Pressure Access Ports

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

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

8.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

S2-1/2 gallon garden sprayer

S Water rinse with low velocity spray nozzle

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in accelerated corrosion of unit parts.

Harsh chemicals, household bleach or acid or basic cleaners should not be used to clean outdoor or indoor coils of any kind. These cleaners can be very difficult to rinse out of the coil and can accelerate corrosion at the fin/tube interface where dissimilar materials are in contact. If there is dirt below the surface of the coil, use the Totaline environmentally sound coil cleaner.

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in reduced unit performance or unit shutdown.

High velocity water from a pressure washer, garden hose, or compressed air should never be used to clean a coil. The force of the water or air jet will bend the fin edges and increase airside pressure drop.

Totaline Environmentally Sound Coil Cleaner Application Instructions

1.Proper eye protection such as safety glasses is recom- mended during mixing and application.

2.Remove all surface loaded fibers and dirt with a vacu- um cleaner as described above.

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

4.Mix Totaline environmentally sound coil cleaner in a 2-1/2 gallon garden sprayer according to the instruc- tions 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.

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

6.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 po- tential for fin damage.

7.Ensure cleaner thoroughly penetrates deep into finned areas.

8.Interior and exterior finned areas must be thoroughly cleaned.

9.Finned surfaces should remain wet with cleaning solution for 10 minutes.

10.Ensure surfaces are not allowed to dry before rinsing. Reapplying cleaner as needed to ensure 10-minute saturation is achieved.

11.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.

Evaporator Coil

Cleaning the Evaporator Coil

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

2.If economizer or two-position damper is installed, re- move economizer by disconnecting Molex plug and removing mounting screws.

3.Slide filters out of unit.

4.Clean coil using a commercial coil cleaner or dish- washer detergent in a pressurized spray canister. Wash both sides of coil and flush with clean water. For best results, back-flush toward return-air section to re- move foreign material. Flush condensate pan after completion.

5.Reinstall economizer and filters.

6.Reconnect wiring.

7.Replace access panels.

Evaporator Coil Metering Devices

The metering devices are multiple fixed-bore devices (Acutrolt) swedged into the horizontal outlet tubes from the liquid header, located at the entrance to each evaporator coil circuit path. These are non-adjustable. Service requires replacing the entire liquid header assembly.

To check for possible blockage of one or more of these metering devices, disconnect the supply fan contactor (IFC) coil, then start the compressor and observe the frosting pattern on the face of the evaporator coil. A frost pattern should develop uniformly across the face of the coil starting at each horizontal header tube. Failure to develop frost at an outlet tube can indicate a plugged or a missing orifice.

Refrigerant System Pressure Access Ports

There are two access ports in the system - on the suction tube near the compressor and on the discharge tube near the compressor. These are brass fittings with black plastic caps. The hose connection fittings are standard 1/4 SAE male flare couplings.

The brass fittings are two-piece High Flow valves, with a receptacle base brazed to the tubing and an integral spring-closed check valve core screwed into the base.

48TC

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