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2
INSTALLATION
48/50A Units —
The CO
2
sensor is to be installed in the
predrilled holes located above the auxiliary control box (see
Fig. 2).
1. Shut off unit power supply.
2. Open the hinged auxiliary control box access door and
secure.
3. Remove the sensor and cover from the sensor mounting
plate.
4. Secure mounting plate to bracket (48/50A) with no. 8
screws (see Fig. 3).
5. Wire the electrical harness to the sensor as shown in
Fig. 3 and 4.
6. Remove the blankout plate from the partition, just above
the auxiliary control box.
7. Attach the sensor to the mounting plate.
8. Mount the bracket to the partition using 2 sheet metal
screws (see view F in Fig. 2).
9. Connect the electrical harness (PL18).
10. Restore power to unit.
48/50P and 48/50Z Units — The CO
2
sensor is to be
installed in the predrilled holes located in the power exhaust
section. See Fig. 5-11.
1. Shut off unit power supply.
2. Open the power exhaust section doors/panels to gain
access.
3. Remove the sensor and cover from the sensor mounting
plate.
4. Secure mounting plate to the bracket with no. 8 screws.
5. The electrical wire harness for the CO
2
sensor is factory
installed. Locate the four wires in the power exhaust
section. Wire the electrical harness to the sensor as shown
in Fig. 4.
6. Attach the sensor to the mounting plate.
Mount the bracket to the appropriate location:
size 030-050 units with power exhaust, see Fig. 5 and 6.
size 030-050 units with economizer only, see Fig. 7.
size 030-050 units with no economizer or power exhaust,
see Fig. 8.
48/50P055-100 and 48/50Z055-105 units with power ex-
haust, see Fig. 9.
48/50P055-100 and 48/50Z055-105 units with economiz-
er only, see Fig. 10.
48/50P055-100 and 48/50Z055-105 units with no econo-
mizer or power exhaust, see Fig. 11.
CO
2
SENSOR
AUXILIARY
CONTROL BOX
PARTITION
BRACKET
(48/50A)
ELECTRICAL
HARNESS
Fig. 2 — 48/50A CO
2
Sensor Mounting Location
VIEW F