Carrier 50LJQ008 Specifications download pdf (Page 19)

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 ﬁrst, 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 satisﬁed during a defrost cycle,

the unit will continue in the defrost mode until the time or

temperature constraints are satisﬁed.

SERVICE

When servicing unit, shut off all electrical power to unit

to avoid shock hazard or injury from rotating parts.

Cleaning — 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 ﬁlters 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 ﬂush with clean water. For best results, back-

ﬂush toward return-air section to remove foreign

material.

5. Flush condensate pan after completion.

6. Reinstall economizer and ﬁlters.

7. Reconnect wiring.

8. Replace access panels.

OUTDOOR COIL — Inspect coil monthly. Clean outdoor

coil annually, and as required by location and outdoor air

conditions.

2-Row Coils— 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 ﬂush down

between the 2 coil sections to remove dirt and debris. Clean

the outer surfaces with a stiff brush in the normal manner.

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.

Fig. 21 — Cleaning Outdoor Coil

Fig. 22 — Propping Up Top Panel

Fig. 23 — Separating Coil Sections

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Carrier 50LJQ008 Specifications Page 19

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