F31HC-F35HC-UL

27 IMPORTANT! Before any service / maintenance operations are performed to the unit, locate and lock out the main power supply to the unit. Note: In some cases more than (1) power source (breaker or service disconnect switch) may be supplied. BE SURE TO LOCK OUT / TAG OUT ALL SOURCES OF POWER! SERVICE — MAINTENANCE COIL AND DRAIN PAN HEATER REPLACEMENT PROCEDURE 1. Before removing the electric heaters make sure that they are all at ambient temperature 2. Remove both left and righthand unit end covers by removing (3) Philips head screws per side 3. If the drain pan heater ( SHB ) is to be replaced remove the field installed condensate drain line from the unit, then detach the drain pan by re moving (4) Philips head screws ( Items 1 & 2 ) 4. Identify the coil heater to be replaced ( FHC ) and at- tach pulling wires for the replacement heater to the (2) wire leads of the defective heater (Items 3 & 4) 5. The heater retaining clip ( item U ) must be re- moved from the old heater by squeezing the clip together to release it from the hole in the tube sheet (Item V) 6. Remove the defective heater by pulling it straight out from the retaining clip end of the heater ( Items 5 & 6 ) being careful to leave the (2) pulling wires inside the coil (Item 3) 7. Install the retaining clip ( U ) onto the replacement heater (Item 9) 8 . Attach the (2) pulling wires still in the coil ( Item 3 ) to the wire leads of the replacement heater ( Item 7 ) and guide the boot ends of the heater through the holes in the tube sheet ( Item 11 ) and straight into the coil ( Item 12 ) while an assistant pulls gently on the opposite end of the (2) pulling wires IMPORTANT! Be careful when inserting a replacement heater into the coil assembly in a confined area. The heaters are annealed to allow some flexibility and bending during installation however sharp bends or kinks must be avoided to prevent damaging the replace- ment heater. The ends of the heater entering the coil must always be inserted straight - attempting to force the heater into the coil at an angle ( Item 8 ) may result in internal damage to the coil assembly! 9. When the replacement heater is in its final position insert the heater retaining clip into the hole in the tube sheet to prevent any movement of the heater during operation 10. Reconnect the (2) heater wire leads being careful to properly secure any excess wire in order to prevent it from contacting the heated portion of any of the heaters 11. Replacement of the drain pan heater ( SHB ) is accomplished by disconnecting the (2) wire leads New Heater New Heater and gently prying up the metal retainer clips ( Item Z ) to release the heater 12 . Replacement is the reverse of this procedure