Carrier 50HCQA installation instructions Smoke Detectors, LEDs, System, Controller, Sensor

		Table 9 – LEDs
	The LEDs on the RTU-MP show the status of certain functions
If this LED is on...		Status is...
Power		The RTU MP has power
Rx		The RTU MP is receiving data from the network segment
		The RTU MP is transmitting data over the network segment
Tx
		The digital output is active
DO#
	The Run and Error LEDs indicate control module and network status

If Run LED shows...	And Error LED shows...
2 flashes per second	Off
2 flashes per second	2 flashes,
	alternating with Run LED
2 flashes per second	3 flashes,
	then off
2 flashes per second	4 flashes,
	then pause
2 flashes per second	On
5 flashes per second	On
5 flashes per second	Off
7 flashes per second	7 flashes per second, alternating with
	Run LED
14 flashes per second	14 flashes per second,
	alternating with Run LED
On	On

Status is...

Normal

Five minute auto---restart delay after system error

Control module has just been formatted

Two or more devices on this network have the same ARC156 network address

Exec halted after frequent system errors or control programs halted

Exec start---up aborted, Boot is running Firmware transfer in progress, Boot is running

Ten second recovery period after brownout

Brownout

Failure. Try the following solutions:

STurn the RTU---MP off, then on. S Format the RTU---MP.

S Download memory to the RTU---MP. S Replace the RTU---MP.

50HCQA

NOTE: Refer to Form 48-50H-T-2T for complete configuration of RTU-MP, operating sequences and troubleshooting information. Refer to RTU-MP 3rd Party Integration Guide for details on configuration and troubleshooting of connected networks. Have a copy of these manuals available at unit start-up.

Smoke Detectors

Smoke detectors are available as factory-installed options on 50HCQ 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 “Completing Installation of Return Air Smoke Sensor:” on page 35 for details.

System —

The smoke detector system consists of a four-wire controller and one or two sensors. Its primary function is

to shut down the rooftop unit in order to prevent smoke from circulating throughout the building. It is not to be used as a life saving device.

Controller —

The controller (see Fig. 58) includes a controller housing, a printed circuit board, and a clear plastic cover. The controller can be connected to one or two compatible duct smoke sensors. The clear plastic cover is secured to the housing with a single captive screw for easy access to the wiring terminals. The controller has three LEDs (for Power, Trouble and Alarm) and a manual test/reset button (on the cover face).

Sensor —

The sensor (see Fig. 59) includes a plastic housing, a printed circuit board, a clear plastic cover, a sampling tube inlet and an exhaust tube. The sampling tube (when used) and exhaust tube are attached during installation. The sampling tube varies in length depending on the size of the rooftop unit. The clear plastic cover permits visual inspections without having to disassemble the sensor. The cover attaches to the sensor housing using four captive screws and forms an airtight chamber around the sensing electronics. Each sensor includes a harness with an RJ45 terminal for connecting to the controller. Each sensor has four LEDs (for Power, Trouble, Alarm and Dirty) and a manual test/reset button (on the left-side of the housing).

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