Carrier 012 Service, Ð Cleaning Outdoor Coil, Ð Propping Up Top Panel, Ð Separating Coil Sections

position of the reversing valves and shuts off the outdoor fan. The electric heaters (if installed) will be energized. On units with economizer, the economizer damper blade will move to the fully closed position.

The unit continues to defrost until the coil temperature as measured by DFT2 reaches 65 F or the duration of defrost cycle completes a 10-minute period.

During the defrost mode, if circuit 1 defrosts ®rst, RVS1 will oscillate between heating and cooling modes until the defrost mode is complete.

At the end of the defrost cycle, the electric heaters (if in- stalled) will be deenergized; the reversing valves switch and the outdoor-fan motor will be energized. On units with econo- mizer, the economizer damper blade will move to the mini- mum position. The unit will now operate in the heating mode.

If the space thermostat is satis®ed during a defrost cycle, the unit will continue in the defrost mode until the time or temperature constraints are satis®ed.

SERVICE

When servicing unit, shut off all electrical power to unit to avoid shock hazard or injury from rotating parts.

Cleaning Ð Inspect unit interior at the beginning of each heating and cooling season and as operating conditions require.

INDOOR COIL

1.Turn unit power off. Remove indoor coil access panel.

2.If accessory economizer is installed, remove economizer by disconnecting Molex plug and removing economizer mounting screws. Refer to Accessory Economizer Instal- lation Instructions for more details.

3.Slide ®lters out of unit.

4.Clean coil using a commercial coil cleaner or dishwasher detergent in a pressurized spray canister. Wash both sides of coil and ¯ush with clean water. For best results, back- ¯ush toward return-air section to remove foreign material.

5.Flush condensate pan after completion.

6.Reinstall economizer and ®lters.

7.Reconnect wiring.

8.Replace access panels.

OUTDOOR COIL Ð Inspect coil monthly. Clean outdoor coil annually, and as required by location and outdoor air conditions.

2-Row CoilsÐ Clean coil as follows:

1.Turn off unit power.

2.Remove top panel screws on outdoor-coil end of unit.

3.Remove outdoor-coil corner post. See Fig. 21. To hold top panel open, place coil corner post between top panel and center post. See Fig. 22.

4.Remove device holding coil sections together at return end of outdoor coil. Carefully separate the outer coil sec- tion 75 to 100 mm (3 to 4 in.) from the inner section. See Fig. 23.

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

Fig. 21 Ð Cleaning Outdoor Coil

Fig. 22 Ð Propping Up Top Panel

Fig. 23 Ð Separating Coil Sections

6.Reposition the outer coil panel section and remove the coil corner post from between the top panel and center post. Secure the sections together.

7.Install the coil corner post, coil center post and replace all screws.

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