Smoke Detectors - Carrier 48HC Installation Instructions Manual

To wire the return air enthalpy sensor, perform the
following:
1. Use a 2- - conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the
enthalpy controller.
2. Connect the field- - supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(+) terminal on the enthalpy controller. Connect the
BLK wire to (- - ) spade connector on the return air
enthalpy sensor and the (- - ) terminal on the enthalpy
controller.

Smoke Detectors

Smoke detectors are available as factory- - installed options on
48HC models. Smoke detectors may be specified for Supply
Air only or for Return Air without or with economizer or in
combination of Supply Air and Return Air. Return Air
smoke detectors are arranged
configurations only. All components necessary for operation
are factory- - provided and
factory- - configured for immediate smoke detector shutdown
operation; additional wiring or modifications to unit terminal
board may be necessary to complete the unit and smoke
detector configuration to meet project requirements.
Units equipped with factory- - optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See Fig. 84 for the as shipped location.
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Smoke Detector assembly. See Fig. 85, Step 1. Save
the screws.
2. Turn the assembly 90 and then rotate end to end.
Make sure that the elbow fitting is pointing down. See
Fig. 85, Step 2.
3. Screw the sensor and detector plate into its operating
position using screws from Step 1. See Fig. 85, Step 3.
4. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
Step 1
for vertical return
mounted. The unit
Step 2
Fig. 85 - - Completing Installation of Return Air Smoke Sensor
Return Air
Smoke Detector
(as shipped)
is Fig. 84 - - Return Air Smoke Detector, Shipping Position
Additional Application Data —
Refer to Catalog No. HKRNKA- - 1XA for discussions on
additional control features of these smoke detectors
including multiple unit coordination.
48
C12282
Step 3
C12283