Carrier PACKAGE ROOFTOP 48HC Instruction Manual download pdf (Page 48)

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 for vertical return

configurations only. All components necessary for operation

are factory--provided and mounted. The unit is

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.

Return Air

Smoke Detector

(as shipped)

C12282

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.

Step 1 Step 2 Step 3

C12283

Fig. 85 -- Completing Installation of Return Air Smoke Sensor

48HC

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Carrier PACKAGE ROOFTOP 48HC Instruction Manual Page 48

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