HONEYWELL IRIS P522 Flame Monitoring System

IRIS Private Protocol: ASCII character transfer, 4800 or 9600 baud, used for communication with IRIS dedicated software.

Modbus RTU protocol: 9600 baud, 8 data bits, no checksum, 1 stop bit, supports function codes 01 (read coil), 03 (read hold register), 06 (write single register), 16 (write multiple registers).

1. Station address setting

Press and hold the RESET button for more than 2 seconds, and the display screen will show the current baud rate and station address (e.g. "4802" represents 4800 baud, station number 2). Use the UP/DOWN key to adjust and the STORE key to save. The station number range is 0-63.

2. Modbus register mapping

P522 provides 23 4X hold registers (read-only or read-write) and 5 0X discrete inputs (read-only), including:

40001: Current channel flame count value

40002: Processor status (including channel selection, flame relay, lock status and other bit indicators)

40003-40016: ON/OFF, gain, filter and other settings for each channel

40017-40018: Sensor type code (read-only)

40019-40020: Sensor internal temperature (read-only, ° C)

Installation and Debugging Guide

1. Aim and sight tube

The aiming of the flame sensor directly affects the signal quality:

UV sensor: Aim at the root of the flame, the area with the highest concentration of ultraviolet radiation.

Infrared sensor: parallel to the axis of the burner, aimed at the primary combustion zone to obtain the maximum flame jitter signal.

Relationship between inner diameter and length of visual tube:

S509/S512 (viewing angle of approximately 2.8 °): The maximum length of a 1-inch sight tube is 2 feet, and the maximum length of a 2-inch sight tube is 4 feet.

S511 (viewing angle of approximately 1.1 °): The longest 1-inch tube is 4 feet, and the longest 2-inch tube is 8 feet.

2. Blow air

It is recommended to provide continuous blowing air (approximately 3 CFM, pressure 8 inches of water column higher than the air box pressure) for each sensor to keep the lens clean and reduce temperature. The blowing air should be clean, free of oil and water.

3. Grounding and interference suppression

The signal shielding layer must be grounded at both the sensor end and P522 end.

If there is a potential difference between the sensor housing and the front end of the boiler, a plastic insulated joint should be used to isolate the grounding circuit.

The high-voltage ignition transformer should be installed as close as possible to the ignition electrode, the secondary lead should be as short as possible, and the transformer casing should be grounded.

Fault diagnosis and maintenance

The document provides a detailed troubleshooting guide, common problems and countermeasures:

Possible causes and measures for handling the phenomenon

No display power failure, fuse disconnected, check 26V power supply, power off for 10 seconds, reset self recovery fuse

Display 0000 sensor power loss, sensor fault check sensor terminal voltage (should be 26V), check sensor wiring

The flame signal is normal, but the relay does not engage. The set point is incorrect. Check if the flame ON threshold is higher than the current signal value

LOCKOUT light on self-test failed (dark cycle pulse>10). Check the shutter mechanism, sensor cable, and sensor itself

1-9 LED constant light noise interference inspection grounding circuit, shielding layer connection, ignition transformer position

P522AC and P522DC upgrade models

At the end of the document, two upgrade models for P522 are introduced:

P522DC: DC power supply (22-26V), relay contact capacity increased to 5A @ 277VAC, supporting a wider operating temperature range (0-60 ° C CSA certification).

P522AC: AC power supply (85-264VAC, 47-440Hz), built-in power module, and also provides 24V output terminal for external control circuit power supply.

Both models retain all the functions of the original P522, including self recovery fuses, RS-422 communication, dual channel switching, etc.