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
When servicing the unit, shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts.
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
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
5.Flush the condensate pan after completion.
6.Reinstall the
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
Clean
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
Fig. 43 — Cleaning Outdoor Coil
Fig. 44 — Propping Up Top Panel
Fig. 45 — Separating Coil Sections
47
