Junction Box Replacement - Honeywell Sensepoint Technical Manual

Junction Box Replacement

This section tells how to:
• remove the sensor from the enclosure
• replace the existing junction box with a replacement
• refit the original sensor to the new box
Carry out the following procedure, referring to the previous diagram:
1 Isolate all associated power supplies and ensure that they remain OFF during the this
procedure.
2 Open the enclosure lid.
Unscrew the four M4 captive securing hex. screws, using a 4 mm (0.16 in.) A/F hex key
wrench. The lid is attached to the base by a retaining hinge. Lift the lid vertically away from
the enclosure base and then tilt it away from the base.
3 Disconnect the sensor wiring at the terminal block.
Record the position of the wiring.
4 Unscrew and remove the sensor's M20 locknut.
5 Remove the sensor from the enclosure.
Grip the sensor collar firmly where it meets the enclosure and unscrew the sensor in a
counter-clockwise direction. Refer to the warning about sensor handling and disposal at the
start of this chapter.
6 Put the sensor and M20 locknut to one side for re-fitting later.
7 Disconnect the controller wiring at the terminal block.
Record the position of the wiring.
8 Remove the controller cable and gland from the box
9 Remove the junction box from its mounting.
The box is attached by two mounting lugs and M6 screws/bolts. Record the type of gas label
affixed to the front of the enclosure. Discard the box.
10 Fit the new junction box.
Part number: SPSTJB. Use M6 screws/bolts. Also check the installation instructions,
see page 11.
11 Fit a new gas label to the new box.
The new junction box is supplied with gas labels for all nine types of gas detector. Read the
warning about the gas label at the start of this chapter. Ensure the correct one is fitted.
12 Open the new enclosure lid.
Unscrew the four M4 captive securing hex. screws, using a 4 mm (0.16 in.) A/F hex key
wrench. The lid is attached to the base by a retaining hinge. Lift the lid vertically away from
the enclosure base and then tilt it away from the base.
2106M0525 Iss 2 Nov 05
Maintenance
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