Outside Air Motorized Damper Removal; Outside Air And Exhaust Fan Replacement; Outside Air Fan Removal - Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting

Outside Air Motorized Damper Removal

1. Turn off, lockout and tag-out electrical power to unit.
2. Remove the outside air motorized damper access panel by
removing the self-sealing screws around the perimeter (see
Fig. 54).
NOTE: Even after all of the screws have been removed from the
panel it still may be difficult to remove due to the gasket applied
from the original installation. Take care not to damage the gasket.
If damage occurs use 9430-2300 gasket to replace before reattach-
ing the panel.
3. Disconnect the connector labeled PL06 for the damper
motor from the wiring harness inside the air chamber of
the EnergyX unit.
4. Slide out the outside air motorized damper by pulling it
along the track guides. See Fig. 55.

Outside Air and Exhaust Fan Replacement

OUTSIDE AIR FAN REMOVAL

1. Turn off, lockout and tag-out electrical power to unit.
2. Remove outside air hood (see procedure on page 96).
3. Remove outside air motorized damper (see procedure above).
4. Remove the lower and upper guides for the outside air
motorized damper by removing the screws along the
Fig. 54 — Exhaust Air Hood Removal
5.
6.
NOTE: See instructions for removing the wheel and supply filters
if more room is needed to access the outside air fan through the
door for better maneuverability.
7.
NOTE: Tilt the fan assembly front panel to fit it through the hood
opening.
8.
NOTE: Tilt the fan assembly to fit its back panel through the
opening in the dividing wall.
9.
97
length of the flanges connecting them to the inside of the
ERV unit.
Disconnect the connector PL121, PL123 and the power
wires for the exhaust fan motor from the wiring harness
inside the air chamber of the EnergyX unit.
Remove the fasteners at each corner of the outside air fan
that secure the outside air fan front panel to the dividing
wall by access through the hood opening of the ERV. See
Fig. 56.
Remove the four bolts holding the front fan panel onto the
rest of the outside air fan assembly. Completely remove
this panel from the ERV.
Pull the outside air fan out through the hood opening. See
Fig. 57.
Repeat Steps 6, 7, and 8 to remove the second fan.