Filter
Top Products
position of the reversing valves and shuts off the outdoor
fan. The electric heaters (if installed) will be energized. On
units with economizer, theeconomizer damperblade 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
19