ENMET ISA-44-RAL-OD - Manual (Page 13)

ISA-44RAL-OD / ISA-44RAH-OD ENMET Corporation
9
4.0 Installation 4.0 Installation
After becoming familiar with the main parts and their functions, follow the installation procedure as outlined below:
1. Choose an appropriate location for mounting the electronics control unit. Do not locate the sampling head assemble
in an area where quick temperature changes are likely to occur, like near an outside door. The oxygen cell is
sensitive to temperature and the circuitry for this cell cannot track rapid changes in temperature. A rapid change in
temperature may cause nuisance alarms, especially for those units calibrated to alarm at a percent near the normal
fresh air volume (20.9%).
2. The three terminal block positions shown in Table 1 below (TB3-4, TB3-5, TB3-6) are attached to relay K3 (see
Figure 2) and are available as a switch to activate any remote alarms or equipment when the oxygen alarm triggers.
This relay has a rating of 2 amps continuos, 5 amps surge at 110Vac. When power is interrupted, this relay switches
to the same position as in an oxygen-deficient situation.
Table 1: Oxygen Alarm Relay Contacts
Position Function Relay
TB3-4 Normally Closed K-3
TB3-5 Normally Open K-3
TB3-6 Common K-3
3. The six terminal block positions shown in Table 2 below (TB1-5 - TB1-10) are attached to the two CO alarm relays, K-
1 and K-2 (see Figure 2). These positions are available as switches to activate any remote alarms or equipment when
either the CO low alarm or CO high alarm triggers. These relays have the rating of 2 Amps continuous, 5 Amps surge
at 110Vac. When power is interrupted, these relays switch to the same position as in a gas alarm situation.
N OTE : K-1 is the relay for the CO low alarm.
K-2 is the relay for the CO high alarm.
Table 2: CO Alarm Relay Contacts
Position Function Relay
TB1-5 Common K-2 CO low alarm
TB1-6 Normally Open K-2 CO Low alarm
TB1-7 Normally Closed K-2 CO Low alarm
TB1-8 Common K-1 CO High alarm
TB1-9 Normally Open K-1 CO High alarm
TB1-10 Normally Closed K-1 CO High alarm
4. Run the relay contact leads through the oiltight fitting for the power supply leads. If you want to run the relay
contact leads through another part of the enclosure, drill a hole in the side or bottom of the enclosure and use a
NEMA 4X oiltight fitting.
N OTE : The ISA-RAL-OD is completely oiltight. Use the correct oiltight fitting for the cord or conduit when supplying
power to the unit.
N OTE : The ISA-44RAL-OD is engineered for respiratory air lines having 50 - 250 PSI . If your air line has a higher
pressure, you must use the ISA-44RAH-OD (see Section 1.2).
N OTE : If used in conjunction with an ENMET air filtration panel, the ISA-44RAL-OD can be mounted on the air filtration
panel mounting plate. Attach the RAL-OD assembly to the quick disconnect fitting on the air filtration unit.