JOHNSON CONTROLS
35
FORM 130.13-NOM8 (1021)
Coil Replacement
1. Disconnect all electrical power to the equipment,
lock out and tag out power source.
2. Disconnect all ductwork, if applicable.
3. Remove filter rails/ filter clips, if applicable.
4. Drain water from coil.
5. Cut or un-braze water connection at coil, or if ap
-
plicable, remove valve packages at coil.
6. Remove Drip Pan and Drip Tray, if applicable.
7. Disconnect coil from equipment by removing
screws on the exterior perimeter of the coil.
8. To reinstall coil, follow steps 1-7 in reverse fashion.
Electric Heat
Electric heat requires a minimum of
0.1” W.G. downstream static pressure
for proper operation.
Electric heaters come equipped with a primary auto-reset
limit switch to provide protection against overheating.
The primary auto-reset limit switch automatically cuts
the heater off when overheating occurs, and turns the
heater back on when the elements have cooled down.
Should the secondary one-time trip limit switch trip, it
will need to be replaced with a limit switch of the same
rating. Optional secondary manual reset limit switches
are available. Electric heaters may be equipped with
optional disconnect switch, fuses and airflow proving
switch.
Electric Heat Replacement
Step 1:
Disconnect all electrical power to the equipment,
lock out and tag out power source. Locate electric heat
wiring harness cover on the side of the discharge duct.
Step 3:
Remove the four (4) screws securing the electric
heat t-plate to the side of discharge duct. Carefully slide
electric heat rack out and away from the discharge duct.
Step 2:
Remove screws securing electric heat wiring har-
ness cover. Remove cover from unit and set aside. Discon-
nect visible wiring harness.
Step 4:
Perform electric heat rack maintenance or replac-
ment as required. To reinstall, perform steps 1-3 in reverse
fashion. Ensure all electric control enclosure panels are
properly secured in place before applying power to the unit.
