Step 10 - Make Outdoor-Air Inlet; Adjustments; Economizer And Fixed Outdoor - Carrier WeatherMaker 48A020 Installation Instructions Manual

2. Cut the CCN wire and strip the ends of the red (+), white
(ground), and black (–) conductors. (If a different network
color scheme is used, substitute appropriate colors.)
3. Remove the 3-pin male plug from the base control board in
the main control box, and connect the wires as follows:
a. Insert and secure the red (+) wire to terminal 1 of the
3-pin plug.
b. Insert and secure the white (ground) wire to terminal
2 of the 3-pin plug.
c. Insert and secure the black (–) wire to terminal 3 of
the 3-pin plug.
4. Insert the plug into the existing 3-pin mating connector on
the base module in the main control box.
VAV Units with Heat — For variable air volume units that will
use heat, the variable air volume terminals should be interlocked
with the unit at TB5 terminals 1 and 2.
Demand Controlled Ventilation — The unit can be equipped
with a CO sensor for use in demand ventilation. This can be facto-
2
ry supplied and will be mounted in the return duct. It can also be
field supplied and mounted in the return duct or in the space. Con-
nect the field-installed 4 to 20 mA sensor to TB5 terminals 6 and 7.
Do not remove the factory-installed 182-ohm resistor.
If an outdoor air quality sensor is used then it should be wired to
terminal 11 and 12 on TB6. This will require the use of the
optional controls expansion module.
Remote IAQ Override — If the control is being used with a non-
Carrier building management system, it supports the use of the re-
mote IAQ override switch. This should be connected to TB6 ter-
minal 13 and 14. Use of this will require the optional controls ex-
pansion module.
Remote Economizer Position Control — The ComfortLink con-
trols will normally control the position of the economizer, but it
can also support field control of the economizer position through a
4 to 20 mA signal. If this is used it should be connected to TB5
terminal 6 and 7. If the signal is a 4 to 20 mA signal then leave the
182-ohm resistor in place.
Remote Economizer Enable — If the control is being used with
other building management systems and the system will control
the enabling and disabling of the economizer free cooling, this
switch input can be connected to TB6 terminals 1 and 2. Note that
the controls also support integrated economizer changeover using
outdoor dry bulb, differential dry bulb, outdoor enthalpy, and dif-
ferential enthalpy.
Remote Occupancy Switch — For interface to other building
management systems, the control also supports a switch input for
remote occupancy signals. This wiring should be connected to ter-
minal TB6 terminal 1 and 3.
Remote Economizer Minimum Position Control — If the Com-
fortLink controller is controlling the economizer, but a remote mini-
mum position is required, then an external 100K potentiometer can
be connected to TB5 terminal 6 and 7. Remove the factory-in-
stalled 182-ohm resistor.
Smoke Sensor Interface — The ComfortLink controller includes
an optional factory-installed return air smoke detector. Remote
alarm circuits can be wired to TB5 terminal 8 and 9.
Fire Shutdown and Smoke Control — The control supports in-
terface to fire and smoke control systems and allows for the fol-
lowing system overrides from remote switch inputs.
• Fire Shutdown — Connect to TB5 terminals 10 and 11.
• Smoke Pressurization — Connect to TB5 terminals 12
and 13. This requires the use of the optional controls
expansion module.
• Smoke Evacuation — Connect to TB5 terminals 12 and 14.
This requires the use of the optional controls expansion
module.
• Smoke Purge — Connect to TB5 terminals 12 and 15. This
requires the use of the optional controls expansion module.
Demand Limiting — The control can also be used with demand
limiting control from remote building management systems. If a
two-stage system is going to be used with redline limiting where the
machine is not allowed to increase load and load shed where the
load is decreased to a configurable limit in capacity then these can
be connected to TB6 terminals 4 and 5, and 5 and 6. This requires
use of the controls expansion module.
Step 10 — Make Outdoor-Air Inlet Adjustments
ECONOMIZER AND
DAMPER — Hoods are used on all units with economizer or
adjustable self-closing fixed outdoor air damper.
NOTE: If accessory power exhaust or barometric relief packages
are being added to the unit, install power exhaust or barometric
relief before installing economizer hoods.
Economizer Hood Assembly — The economizer hood is
shipped in a package secured to the outside of the unit. The hood
assemblies must be field assembled. The 48A4,A5,A8,A9 units
are side supply and side return. The return duct limits access to
economizer filters from below.
The 48A020-050 units have two hoods on every unit. The
48A060 units have 3 hoods on every unit.
NOTE: Before assembly of the economizer hood, check along the
outer edges of the economizer assembly for any seal strip protrud-
ing past the flanges. Trim the excess seal strip so that it is flush
with the economizer assembly flanges.
Perform the following procedure to assemble the economizer
hood.
1. Apply black seal strip (provided) to outside top-edge of hood
sides. Wrap seal strip over edge to cover top flange (2 hood
sides per hood assembly). Make sure seal strip covers screw
holes. See Fig. 27.
2. Add gray foam strip (provided) to cross members on bottom
tray. See Fig. 28.
3. Assemble hood sides, top, and cross member with gasket-
ed screws provided. See Fig. 29.
4. Attach speed clips (provided) to hood top. Engagement
section of the clip faces inside hood. See Fig. 30.
5. Apply black seal strip (provided) to mounting flanges of
hood sides being sure to cover mounting holes. See
Fig. 31.
6. Apply black seal strip (provided) to back of hood top mount-
ing flange. Seal strip of hood top mounting flange must press
tightly against seal strip of hood side mounting flanges. See
Fig. 31.
7. Attach gray foam strip (provided) to block-off baffle on out-
er face of flange. See Fig. 32.
8. Remove the screws on each end and along top of the outdoor
air opening of unit. Set hood assembly in place and attach to
unit using gasketed screws. See Fig. 33.
9. Locate and mount block-off baffle using 3 screws. See
Fig. 34.
10. Assemble bottom filter tracks side by side with the mounting
angle together. The filter track assemblies must be installed
with the flange and mounting angle pointing down. See
Fig. 35-37.
11. Attach speed clips (provided) to hood side panels. Engage-
ment section of clip faces up and towards the outside of the
hood side panels. Attach mounting angles to hood with gas-
keted screws provided. See Fig. 38.
NOTE: Be sure the filters are installed with the airflow in the
correct direction.
27
FIXED OUTDOOR AIR