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47
HEATING, UNIT WITH ECONOMI$ER2, PREMIERLINK™
CONTROL AND A ROOM SENSOR — Every 40 seconds
the controller will calculate the required heat stages (maximum
of 3) to maintain supply air temperature (SAT) if the following
qualifying conditions are met:
• Indoor fan has been on for at least 30 seconds.
• COOL mode is not active.
• OCCUPIED, TEMP.COMPENSATED START or HEAT
mode is active.
• SAT reading is available.
• Fire shutdown mode is not active.
If all of the above conditions are met, the number of heat
stages is calculated; otherwise the required number of heat
stages will be set to 0.
If the PremierLink controller determines that heat stages are
required, the economizer damper will be moved to minimum
position if occupied and closed if unoccupied.
SERVICE
Cleaning —
Inspect the unit interior at the beginning of each
heating and cooling season or as operating conditions require.
INDOOR COIL
1. Turn off the unit power and tag disconnect. Remove the
filter access panel and indoor coil access panel.
2. If an economizer or accessory two-position damper is
installed, remove the economizer or two-position damper
by disconnecting the economizer plug and removing the
mounting screws.
3. Slide the filters out of the unit.
4. Clean the coil using a commercial coil cleaner or dish-
washer detergent in a pressurized spray canister. Wash
both sides of the coil and flush with clean water. For best
results, backflush toward the return-air section to remove
foreign material.
5. Flush the condensate pan after completion.
6. Reinstall the economizer/two-position damper and filters.
7. Reconnect the wiring.
8. Replace the access panels.
OUTDOOR COILS — Inspect the coils monthly. Clean
condenser coils annually, and as required by location and
outdoor-air conditions.
Clean 2-row coils as follows:
1. Turn off the unit power and tag disconnect.
2. Remove the top panel screws on the outdoor end of the
unit.
3. Remove the outdoor coil corner post. See Fig. 43. To hold
the top panel open, place the coil corner post between the
top panel and the center post. See Fig. 44.
4. Remove the device holding the coil sections together at
the return end of the outdoor coil. Carefully separate the
outer coil section 3 to 4 in. from the inner coil section.
See Fig. 45.
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. Secure the sections together. Reposition the coil sections,
and remove the coil corner post from between the top
panel and center post. Install the coil corner post and coil
center post, and replace all screws.
CONDENSATE DRAIN — Check and clean each year at the
start of cooling season. In winter, keep the drain dry or protect
it against freeze-up.
When servicing the unit, shut off all electrical power to the
unit to avoid shock hazard or injury from rotating parts.
Fig. 43 — Cleaning Outdoor Coil
Fig. 44 — Propping Up Top Panel
Fig. 45 — Separating Coil Sections