Supply Air Smoke Detector Installation —
The supply air smoke detector is to be installed in the pre- drilled holes located on the front of the first indoor blower (Fig. 5).
Prior to installation of this accessory, make sure all power is disconnected to the unit and locked out. Failure to disconnect power supply prior to servicing may result in serious injury.
1.Open the indoor fan access door and secure.
2.Open the hinged electrical/compressor access door and secure.
3.Disconnect wires located on the left-hand side of the fan deck. On 48HG units, the indoor fan plug and the limit switch quick connects must be disconnected. On 50HG units, only the indoor fan plug must be disconnected.
4.Find the 2 plugs located in the blower side plate. Remove the plugs and discard. It will be necessary to remove some of the tape holding the plugs in place.
5.Remove cover from smoke detector. The screws will remain captured in the cover.
6.Place foam gaskets over each sampling tube on smoke detector. See Fig. 1.
7.Remove one knockout from top of smoke detector.
8.Insert stripped ends of wire harness through knockout and wire to smoke detector as shown in Fig. 6.
9.Provide strain relief for wires by attaching wire tie to ground screw located next to the knockout in the smoke detector. Tighten wire tie.
10.Secure sampling tube in inlet closest to the smoke detec- tor electronics using the no. 8 self-tapping screw provid- ed. See Fig. 1 for an example on how to connect a sam- pling tube. Be sure to connect the sampling tube to the middle hole. Insert plug into the end of the sampling tube.
11.Slide smoke detector into holes in partition with the ter-
minal block at the top and secure using two, 8-18 3/4-in. pan head screws.
Do not overtighten screws. Damage to smoke detector may result.
12.Insert sampling tube filters into both sampling tube holders. See Fig. 1.
13.Remove and save the two screws securing the indoor fan sled to the unit.
14.Slide the indoor fan sled out until the back side of the first blower is accessible.
15.Attach wire harness to fan side plate using the 4 screw wire ties and no. 10 screws provided. See Fig. 5 for clarification.
16.Slide in the indoor fan deck and secure using screws saved from Step 13.
17.Attach wire harness to top of Circuit C filter drier (and point B if two circuits) in Fig. 5, using wire tie provided. Make sure that the wire harness is tight.
18.In the Electrical/Compressor section, install snap bushing in the center knockout underneath the terminal strips lo- cated in the bottom right-hand corner of the control box.
19.Route wires from the filter drier to the control box. Wires should follow existing wires through grommet located on
top of the filter section, down the outside of the control box and through the snap bushing. See Fig. 5 and 6.
20.Connect wires to terminal strips as shown in Fig. 5 and 6.
21.Restore power to the unit.
22.Configure ComfortLink™ controller as specified in Con- figuring the ComfortLink Controller below.
23.Perform Standby, Alarm, and Sensitivity Tests on page 7. At a minimum, the Magnet test should be per- formed to verify smoke detector wiring.
24.Turn off power to the unit.
25.Replace smoke detector cover. Do not overtighten screws.
26.Reconnect the indoor fan plug and the limit switch wires if applicable.
27.Close the indoor fan section door.
28.Restore power to the unit and check for alarms. Correct any problems encountered.
29.Close Electrical/Compressor section door.
Configuring the ComfortLink Controller —
Configuration settings for the ComfortLink controller are changed by using the Scrolling Marquee Display. A password may be required to edit the configurations, depending on the previous settings configured in the unit. Default password is “1111”. Use the arrow keys to scroll the red LED on the dis- play to the “Configuration” position and press ENTER . Scroll through the menu until UNIT is found and press ENTER . After reaching the UNIT sub-menu, scroll to FS.SW (Fire Shutdown Input) and press ENTER twice, change the value to 1 (Normal Open) with the arrow keys, press ENTER again. Press ESCAPE three times to return to the top level of the menu. Additional information about changing configurations can be found in the Control and Troubleshooting Guide for 48/50HG units.
OPERATION
The smoke detector must be tested and maintained regu- larly following NFPA 72 requirements. The smoke detector should be cleaned at least once a year. Damage to equip- ment may result.
The smoke detector accessories contain a photoelectric detector approved for an extended air speed range of 100 to 4000 feet per minute (0.5 to 20.3 m/s) and an operational tem- perature range of 32 to 131 F (0° to 55 C). Do not operate the smoke detector out of these ranges.
The smoke detector operates on 24 VAC, 120 VAC, or 240 VAC. The thermostat power terminals on the unit are used to power the smoke detector. Alarm and supervisory relay con- tacts are available for control panel interface (alarm initiation), HVAC control, and other auxiliary functions. Auxiliary relays are also provided for fan shut down or signaling of up to 9 other detectors in the loop for multiple fan shut down. The smoke detector is not designed for 2-wire applications.
The smoke detector can be reset by a momentary power in- terruption, by the reset button on the front cover, by the control panel, or by the remote reset accessory. The smoke detector incorporates a cover tamper feature that provides a trouble signal after 20 minutes if the cover is removed or improper- ly installed. Proper installation of the cover removes the trou- ble condition.
