Справочник Пользователя для Honeywell C7927A

60-2026—11    G.R.  Rev. 07-01 

www.honeywell.com/bbc

Honeywell

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN  55422

Scarborough, Ontario
M1V 4Z9

Printed in U.S.A. on recycled 
paper containing at least 10% 
post-consumer paper fibers.

Can cause serious injury or death.
Be extremely careful while troubleshooting the 

detector; line voltage is present on some of the 

terminals when power is on.

Open the master switch to disconnect power before 

removing or installing the detector.

If a satisfactory flame signal cannot be obtained while 

adjusting the sighting position of the detector, perform the 

procedures indicated in steps 1 through 7. If other difficulties 
are encountered in the system, refer to Troubleshooting in the 

Instructions for the appropriate Honeywell flame safeguard 

control.

1. Check for proper line voltage. Make sure the master 

switch is closed, connections are correct, and power 
supply is the correct voltage and frequency.

2. Check the detector wiring for defects, including:

a. incorrect connections.
b. wiring type or size of wire.

c. deteriorated wire.

d. open circuits.
e. short circuits.

f. leakage paths caused by moisture, soot, or dirt.

3. With the burner running, check the temperature at the 

detector.  When it exceeds 215°F (102°C) for a C7027, 

C7927 or C7044, or 250°F (121°C) for a C7035:

a. use a heat block (part no. 136733) if using a 

C7027A Flame Detector.

b. add the additional insulation between the wall of the 

combustion chamber and the detector.

c. add a shield or screen to reflect radiated heat away 

from the detector, or

d. add cooling (refer to Sight Pipe Ventilation, page 6).

4. Remove the detector and clean the viewing window with 

a soft, clean cloth.

5. Clean the inside of the sight pipe (if one is used) before 

reinstalling the detector.

6. If the flame signal continues to be too low, replace the 

plug-in amplifier (if the control has one).

7. If you still cannot obtain a proper flame signal, replace 

flame detector (C7027A, C7044A) or UV radiation 

sensing tube (C7035A).

1. Clean the viewing window and sight pipe (if used) when 

necessary. Remove the detector and use a soft, clean 
cloth to remove accumulated contaminants from the 

UV radiation sensor tube glass envelope.

2. Ultraviolet sensing tubes have a life expectancy of 

40,000 hours of continuous use within the ambient 

temperature and voltage ratings. Replace the sensing 

tube in the C7035, or replace the C7027, C7927 or 
C7044 Detector, at appropriate intervals.

3. Keep the flame detection system adjusted for the 

smoothest, most reliable operation as recommended by 
the burner manufacturer.

When necessary, clean the C7044 Flame Detector by using 

the following procedure:

1. Loosen the two screws holding the C7044 mounting 

bracket to the blast tube. To remove, twist the bracket 
and detector. Do not loosen the clamp screw that holds 

the mounting bracket to the detector.

2. Clean the viewing window with a soft, clean cloth.
3. Insert the detector into the mounting hole, and to realign 

it, twist against the mounting screws. Tighten the two 

mounting screws.