rUSKIn EFAMS ThErMAl DISpErSIon AIrFlow MEASUrIng SYSTEM InSTAllATIon InSTrUCTIonS
7
wIrIng
Whenever possible, use a dedicated transformer
for each EFAMS System. If you use a dedicated
transformer for multiple EFAMS Systems, ensure that
the transformer is rated with sufficient capacity for
the total load of the connected sensors and other
devices.
Errors in the load calculations can lead to problems.
Wiring multiple low-voltage devices from a common
transformer can result in lower-than-expected voltage
at the device and higher-than-expected current draw
when devices are connected a great distance from
the power source.
Transformers are not required to be isolated from
other devices. Isolation is only required to prevent
electrical fluctuations due to intermittent high loads
from causing problems with electronic devices.
See Figure 7 for supply power and output connec-
tions.
Follow these steps to make wiring connections:
1. Connect 24 VAC power to the Electronic
Controller with a minimum of 20 VA.
a. Connect 24 VAC hot to 24H + terminal.
b. Connect 24 VAC common to 24C - terminal.
c. Negative (-) terminal to be connected to earth
ground.
2. Connect 4 to 20 mA velocity and temperature
outputs from the Electronic Controller to a Building
Automation System (BAS).
Wiring from the 4-20 mA outputs to the Building
Automation System (BAS) should be shielded twisted
pair of at least 22 AWG for all wire connections.
Larger gage wire may be required for long runs. All
wiring must comply with applicable codes.
Note: The Electronic Controller provides two 4-20 mA
signals to the building automation system. Do not
loop power.
Ruskin recommends wiring the system without power
applied as accidental arcing may damage the prod-
uct and will void the warranty.
Figure 7a: Setup and Adjustment
Figure 7b: Setup and Adjustment
roUTEr ConnECTIonS
During Normal Operation, LED’s will illuminate at the
RJ45 connector on the Electronic Controller as follows:
On the T1 Communication Cable the (green) LED il-
luminates to indicate that the Electronic Controller has
properly identified the router. The (orange-yellow) LED
blinks each time the Electronic Controller exchanges data
with the router. The T2 Power cable provides power only
to the router and only the green LED will illuminate.
output output
power
SW2 SW3 SW4 SW5
1-4
5-8
9-12
13-16
T1 T2
Finishing the Installation
1. Connect a shielded CAT5e cable between the
Communication Port RJ45 connector on the router
(see
Figure 7 and Figure 8
) to the Communication
Port RJ45 connector on the Electronic Controller
(see
Figure 7 and Figure 8
) .
2. Connect a shielded CAT5e cable between the Power
Port RJ45 connector on the router (see
Figure 7 and
Figure 8)
to the Power Port RJ45 connector on the
Electronic Controller (see
Figure 7 and Figure 8).
3. Use nylon cable clamps (included in parts bag) to
secure RJ45 cable between the sensors and the
router, and between the router and the Electronic
Controler. Space cable clamps on 6 in. (152 mm)
centers.
4. Move the Electronic Controller’s power switch (see
Figure 9)
to the ON position.
5. Use the LCD Contrast Adjustment screw (see
Figure 9)
to adjust the LCD contrast as desired:
• Turn the screw clockwise to increase contrast.
• Turn the screw counterclockwise to decrease
contrast.
6. Use the Options Menu to configure the Electronic
Controller for your application. See
Setup and
Adjustments
for specific instructions.
7. After configuring the Electronic Controller, replace
the cover.
RUSKIN EFAMS Thermal Dispersion Airflow Measuring System Installation Instructions
power
port
Communication
port
not
Used
not
Used
lCD Screen
6
1
/
8
(156)
3
1
/
8
(80)
11
3
/
8
(290)
Figure 7c: Electronic
Controller Dimensions, in. (mm)
