Step 6 - Install Accessories/Optional Equipment; Low Ambient Operation; Field-Installed Accessory Installation - Carrier 09FC020 Installation, Start-Up And Maintenance Instructions

CABLE
MAXIMUM LENGTH
Set the communication type and baud rate.
For...
MS/TP
ARC156
NOTE: Use the same baud rate for all controllers on the network segment. Wire the controls on a BACnet MS/TP ARC156 network segment in a daisy-
chain configuration. If the AppController is at either end of a network segment, connect a BT485 (purchased separately) to the AppController. The
communication selection DIP Switches are defined on the AppController (see Fig. 32).
Table 7 — CCN Communication Bus Wiring
MANUFACTURER
Regular Wiring
Alpha
American
Belden
Columbia
Manhatten
Quabik
Step 6 — Install Accessories/Optional Equip-
ment

LOW AMBIENT OPERATION

If outdoor ambient operating temperatures below 20°F (–6.67°C)
and the wind velocity is anticipated to be greater than 5 mph
(8 km/h), wind baffles are required. If required, the wind baffles
are field fabricated and installed. Two are required, one for each
end. Wind baffle should be constructed with minimum 18-gage
galvanized sheet metal or other suitable corrosion-resistant materi-
al with cross breaks for strength. See Fig 31. Use field-supplied
screws to attach baffle to the corner posts of the machine. Be sure
to hem or turn a flange on all edges to eliminate sharp edges.
Table 6 — Wiring Specifications
22 AWG or 24 AWG, low capacitance, twisted stranded, shielded copper wire
2000 feet (610 meters)
Set Communications
Selection jumper to...
BACnet MS/TP
BACnet ARC156
PART NUMBER
Plenum Wiring
1895 —
A21451 A48301
8205 884421
D6451 —
M13402 M64430
6130 —
Set DIP switches 1 and 2 to...
The appropriate baud rate. See the
MS/TP Baud diagram on the con-
troller.
N/A. Baud rate will be 156 kbps
regardless of the DIP switch set-
tings.
Disconnect all power to the unit before performing
maintenance or service. Electrical shock and personal injury
could result.
To avoid damage to the refrigerant coils and electrical
components, use extreme care when drilling screw holes and
screwing in fasteners.
Mount a baffle on each end of the unit. Use the upper notches to
locate the baffle. This reduces the risk of damaging a coil while
drilling. Loosen the upper corner post bolts and slide the baffle un-
derneath the flange bolt. Tighten the bolt. Drill holes in the bottom
of the flange of the baffle and mount with two screws to secure the
bottom to the corner post.

FIELD-INSTALLED ACCESSORY INSTALLATION

For applications requiring special accessories, the following pack-
ages are available: hail guard and security grilles. For installation
details, refer to separate installation instructions supplied with
these accessory packages.
29
Set DIP switches 3 and 4 to...
Off/Off
Off/Off
WARNING
CAUTION