Honeywell 700 ユーザーズマニュアル

11

66-2069—02

The self-check circuitry guards against internal component 

failure. There are several tasks that require intelligent 

interaction between the viewing heads and the signal 

processor. If all of these interactions do not occur properly, the 

viewing head will not send pulses back to the signal processor 

and the flame relay will open.

The viewing head should be properly sighted before the 

setpoints are adjusted. Adjustment can be made easier by a 

1/2 in. swivel joint, which Honeywell can supply if one is not 

available (refer to “Accessories” on page 9). 

While the burner is firing, vary the viewing angle while 

observing the green LED on the connector at the rear of the 

viewing head. Adjust the viewing angle for the maximum pulse 

rate, then lock the swivel joint to preserve this mechanical 

setting. If the green LED pulse rate is very high or very low, 

see the two paragraphs below. The locked mechanical setting 

should still be correct when Model 700 viewing heads are 

interchanged, because inside each Model 700 viewing head 

the optical axis is aligned with the mechanical axis within ±1/4 

degree. Also, the reading shouldn’t change when a viewing 

head is rotated in the mount.

For the above sighting adjustments to work properly, the 

flashing rate of the green LED in the connector at the rear of 

the viewing head must be reasonable. On the -PF (pipe fitting) 

version, there are no LEDs. The installer must observe the 

flame signal on the signal processor instead. 

A count rate of 16 to 20 is recommended for proper operation. 

If the displayed count is above 25, the pulses begin to blur 

together, making changes in the pulse rate difficult to observe. 

If the displayed count is less than 8 or 10, it will be difficult to 

maximize the count by adjusting the viewing head aim, since 

the pulses occur too infrequently. In such a case the gain 

should be increased. If the gain is set to a maximum and the 

count rate persists below 8 or 10, the system can still be made 

to work reliably as long as the count rate drops significantly 

when the flame is removed. However, the setup should be 

reviewed for proper viewing head aim and sight path to ensure 

it is optimized.

Orifice disks have been used in applications with older viewing 

heads that did not have adjustable gain in order to reduce the 

extreme brightness of certain burner flames. The orifice disk 

kit is part number M-702-6. Orifice disks come with 3/8, 1/4, 3/

16 and 1/8 inch diameter holes. Contact the factory for 

guidance is using orifice disks. The disks are installed with 

retaining rings in the flange at the edge of the 1/2 inch NPT 

female pipe thread for the process connection. An internal 

type retaining ring is first installed by positioning a ring in the 

machined groove inside the flange opening from the housing 

side. The orifice disk is then inserted. Use a second retaining 

ring to hold it in place so that it is sandwiched tightly between 

the two retaining rings.

If the displayed flame count is 25 or higher when the gain is 

set to 1, an orificing disc inserted in the back end of the 

mounting block can be used. Choose a disc that gives a 

reading of 12 to 24 at a low fire firing rate. The discs have a 

range of orifice sizes; each size step results in about a 2:1 

change in the counts displayed.

The 700ACSP and 700DCSP signal processors have a user 

interface that includes four lights, a two-digit display and 

twelve push buttons for operation and programming. Each 

button has at least one specific purpose.

To enter a menu, press and hold the applicable button for 2 

seconds. Adjustments to the applicable setpoint can be made 

via the INCREASE or DECREASE arrow buttons. To store the 

new setting, press the STORE button until “--” is shown, 

indicating the value has been accepted.

If no activity occurs for a period of four seconds while the 

menu value is displayed, it will revert back to the operating 

display.

To exit a menu at any time without saving changes, simply 

press the RESET/rE button.

The following describes the functions of the LED indicators, 

display and push buttons:

— Used in conjunction with the BNR-ON SEQ START/

END and BNR-OFF SEQ START/END buttons during 

the automatic setup process

— Used in conjunction with the BNR-ON SEQ START/

END and BNR-OFF SEQ START/END buttons during 

the automatic setup process

— Indicates a fault condition

— When in operating mode, the display indicates the 

current flame signal, which ranges between 00 and 29

— Upon power up, indicates whether an IR or UV viewing 

head is attached and the selected gain setting; such 

as r7 (IR with gain of 7) or u5 (UV with gain of 5). 

— Indicates various characters during the automatic 

setup process as well as whether the panel is locked

— When a flame is present, LED flashes at a rate 

proportional to flame signal, except when the pulses 

are interrupted once per second for viewing head self-

checks.

— When the flame signal is above the selected value, the 

LED will be illuminated and the flame relay will be 

energized.

— Allows user to select flame on threshold value. When 

the flame signal is above the selected value, the flame 

relay will be energized. Used in conjunction with the