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Sensing Compartment Cover Installation
a. Install the cover gasket (Figure 3, 16) on the housing, if not already
installed. Be certain the alignment holes in the cover gasket are aligned
with the guides on the housing.
b. Install the sensing compartment ionization cover (17) when using DI-B3,
DI-B3H, ILI-1B, or ILI-1BH detectors and the photoelectric cover (18)
when using an ILP-1 or ILP-2 detector.
c. Fasten the cover, using the No. 6 screws (19) provided. Tighten snugly,
but not so tightly as to warp the cover and cause air leakage around the
edges of the cover.
Sensitivity Testing
1. System 3, System MXL/MXL-IQ (CZM-1, CZM-1B6, CZM-4), System
PXL, System SXL-EX, System SXL, CP-2ER, and XL3 (ZNX-3) air
duct smoke detector sensitivities are factory set and not field adjust-
able. The sensitivity range, as measured with the appropriate sensitiv-
ity meter, is listed on the nameplate label of the detector.
2. The sensitivity of addressable System XL3 smoke detectors can be
measured at the system control panel. Refer to the System XL3 Opera-
tion, Installation, and Maintenance Manual, P/N 315-083206.
3. The sensitivity of addressable MXL/MXL-IQ Control Panel smoke de-
tectors can be measured at the system control panel. Refer to the MXL
Operation, Installation, and Maintenance Manual, P/N 315-092036, or
the MXL-IQ Operation, Installation, and Maintenance Manual, P/N 315-
093624, as applicable.
4. To ensure that the sensitivities are within factory-specified limits, sensi-
tivity testing of the smoke detectors should be done by qualified service
personnel only.
Maintenance
The performance of the air duct detector unit may be adversely affected by
dirt or foreign matter on the sampling tubes or detector. If the air holes in
the inlet sampling tube become restricted, the unit cannot receive a proper
air sample, and performance is impaired. It is recommended that the sam-
pling tubes be checked and cleaned periodically. The detector mainte-
nance program should consist of periodic cleaning of dust from the detec-
tor head by using a vacuum cleaner. For cleaning Model ILP-1 or ILP-2,
refer to the detector's Installation Instructions.
The cleaning and test program is recommended for 6 month intervals, or
more frequently, if needed, depending on the individual detector environment.
13
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