
8
c. Install the inlet tube (3) by inserting it through the air sam ling chamber
as shown in Figure 3. Face sam ling tube holes into the air stream
(Figure 4), and secure to the housing with 8/32 screws (12).
d. Install the outlet tube (4) by inserting it into the u er socket of the air
sam ling chamber with the scarfed end facing downstream (See Figure
4). Secure the bracket to the housing with an 8/32 screw.
e. Make sure no sam ling holes extend beyond the ductway, that the
sto er (9) remains firmly in osition, and that the duct hole is sealed
around the rotruding sam ling tube.
Air Duct Sampling Tube Pressure Measurement
The CERBERUS PYROTRONICSTM Model PDM-3 Pressure Differential
Measuring device should be used to ensure that the sam ling tube ressure
differential is within the s ecified limits (See TECHNICAL DATA). Qualified
ersonnel should take measurements in accordance with the PDM-3
I structio s, P/N 315-085535.
ELECTRICAL WIRING
System XL3 - See Figure 6. Use two wire circuits of 18 AWG, limited
energy, shielded cable without conduit, if ermitted by the local building
codes.
MXL Co trol Pa el - See Figure 7. Use two wire circuits of 18 AWG,
limited energy, shielded cable without conduit, if ermitted by the local
building codes.
IXL System (ICON-1) - See Figure 7. Use two wire circuits of 18 AWG,
limited energy, shielded cable, without conduit if it is ermitted by the
local building codes.
Control of Normally Energized and De-Energized Devices
The Model AD-3XRI/3XRILP can be wired for direct relay control of normally
energized and de-energized devices as follows (Refer to Figure 5).
a. Wire normally energized devices (fans, blowers, etc.) to the NC contacts
between terminals 9 and 10 in order to shut down these devices on alarm.
Figure 5
Connections for Control of Normally Energized and De-Energized Devices
NOTES:
1. All relay contacts shown repre-
sent the condition they are in just
after a reset pulse - the normal
supervisory, no alarm condition.
2. If the alarm relay contacts on the
relay board are being used to
control 120 AC operated equip-
ment, ensure that earth ground
is properly connected to the
internal ground strap, using the
proper conduit lock nuts.
Failure to provide proper
grounding may result in fatal electrical
shock and causes
non-conformance with national
and local codes.