Carrier 50EJQ Installation, Start-Up And Service Instructions Manual page 17

BLOCKOFF BAFFLE
GRAY FOAM STRIP
Fig. 22 — Adding Foam Strip to Block-Off Baffle
Fig. 23 — Mounting Angle (Without Tabs)
Attached to Filter Track Assembly
Fig. 24 — Mounting Angle (With Tabs)
Attached to Filter Track Assembly
MOUNTING ANGLE
(WITHOUT TABS)
FILTER TRACK
ASSEMBLY
10. Return power to unit.
Disable Economizer — For applications where the econo-
mizer will not be used (areas of high humidity), the econo-
mizer should be disabled. To disable the economizer, perform
the following:
MOUNTING ANGLE
1. Turn of power. Lock out disconnect.
(WITH TABS)
2. Locate the OAT in the right hand outdoor air damper area.
3. Locate the splice connecting the violet wire coming from
4. Cap off both wires. When the connection is broken the
17
Fig. 25 — Attaching Seal Strip
to Filter Cover
2. Remove the economizer inlet filters from the bottom of
the right hand economizer hood. See Fig. 17.
3. Remove the factory-installed, 620-ohm jumper between
terminals SR and + on the enthalpy control located
inside the outdoor air hood.
4. Connect the violet wire from the enthalpy sensor kit to
the + terminal on the enthalpy control. Connect the blue
wire from the enthalpy sensor kit to the SR terminal on
the enthalpy control.
5. Turn the enthalpy control set point potentiometer clock-
wise past the ''D'' setting on the enthalpy control to
configure the control to operate on differential enthalpy.
See Fig. 27.
6. Remove the return-air enthalpy sensor from the acces-
sory package. Using the screws provided, mount the
sensor inside the return duct near the unit. Do not locate
the control too far from the unit, or the wires will not
reach from the sensor to the control. On 50EWQ units,
the enthalpy sensor can be installed in the return air sec-
tion of the unit, under the return air dampers.
7. Route the wires from the enthalpy sensor to the return
air enthalpy control through the holes on the inside of
the hinged filter access panel. The holes are blocked by
plug buttons which should be removed.
8. Use field-supplied wire ties to attach the violet wire to
the + terminal and the blue wire to the SR terminal.
9. Replace economizer filters.
T24 on the base module board to the red wire coming
from T29 on the base module board. Remove the wire
nut and break the red to violet wire splice.
base module is fooled into thinking that the enthalpy is
not acceptable and economizer operation is disabled.
BLACK SEAL STRIP
(CENTERED)
FILTER COVER