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Carrier 50HCQA User Manual

Page 35

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location and the tubing to the sampling tube be connected.

See “Completing Installation of Return Air Smoke

Sensor:” for details.)

Return Air Detector Sampling Tube

Controller module

Return Air Detector module
(shipping position shown)*

*RA detector must be moved from shipping position to operating position by installer

C07307

Fig. 61 -- Typical Return Air Detector Location

Return Air with Economizer —

The sampling tube is inserted through the side plates of

the economizer housing, placing it across the return air

opening on the unit basepan. See Fig. 62. The holes in the

sampling tube face downward, into the return air stream.

The sampling tube is connected via tubing to the return air

sensor that is mounted on a bracket high on the partition

between return filter and controller location. (This sensor

is shipped in a flat--mounting location. Installation

requires that this sensor be relocated to its operating

location and the tubing to the sampling tube be connected.

See the following installation procedure.)

Return Air
Sampling Tube

Flexible
Exhaust Tube

C10330

Fig. 62 -- Return Air Sampling Tube Location

Completing Installation of Return Air Smoke Sensor:

1. Unscrew the two screws holding the Return Air

Sensor detector plate. See Fig. 63. Save the screws.

Controller

Screws

Flexible
Exhaust
Tubes

Sampling Tube

C10331

Fig. 63 -- Return Air Detector Shipping Position

2. Remove the Return Air Sensor and its detector plate.
3. Rotate the detector plate so the sensor is facing out-

wards and the sampling tube connection is on the bot-

tom. See Fig. 64.

Sampling Tube

C10332

Fig. 64 -- Return Air Sensor Operating Position

4. Screw the sensor and detector plate into its operating

position using screws from Step 1. Make sure the

sampling tube connection is on the bottom and the ex-

haust tube is on the top. See Fig. 64.

5. Connect the flexible tube on the sampling inlet to the

sampling tube on the basepan.

Additional Application Data —

Refer to Catalog No. HKRNKA--1XA for discussions on

additional control features of these smoke detectors

including multiple unit coordination.

50H

C

Q

A