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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.
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
SERVICE — MAINTENANCE
BE SURE TO LOCK OUT / TAG OUT ALL SOURCES OF POWER!
COIL AND DRAIN PAN HEATER REPLACEMENT PROCEDURE
Drain Pan Heater Detail
and gently prying up the metal retainer clips (Item Z) to
release the heater
12. Replacement is the reverse of this procedure
24
Coil
Heater
New Heater
New Heater
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