4. Insulate damper using 1-1/2 in. to 2-in. insulation. (Check
your local codes.) (See Fig. 8.)
Step 5—Install Barometric Bypass Damper
NOTE:
The barometric bypass damper is a critical part of
Comfort Zone II -B System for controlling noise at minimum
airflow. A barometric bypass should be installed unless the duct
work and indoor unit have been sized for use without a bypass.
The bypass should be installed according to local codes and
SMACNA standards. Be sure bypass is properly supported.
For proper installation, refer to Installation Instructions packaged
with barometric bypass.
Failure to properly install Leaving Air Temperature Sensor
can cause permanent damage to the HVAC equipment.
Step 6—Install Leaving Air Temperature (LAT) Sensor
Locate LAT sensor in main supply trunk after heating and cooling
coil and before bypass damper and first branch. The LAT sensor is
radiant shielded to prevent heat from affecting correct air tempera-
ture.
1. Drill a 1/4-in. hole at location in supply trunk where sensor
will be installed.
2. Insert sensor in hole and use as a template to mark the 2
mounting holes.
3. Drill two 1/16-in. holes to accept No. 6 screws through
pre-drilled holes in duct temperature sensor back plate.
4. Use 2 No. 6 sheet metal screws to mount duct temperature
sensor to unit.
5. Connect sensor to 2-conductor wire using provided wire nuts.
(See Fig. 9, 10, or 11 for connection to Equipment Controller.)
Step 7—Install Heat Pump Temperature (HPT) Sensor
The HPT sensor is required in all heat pump/fan coil installations.
It is not used in dual fuel(heat pump/furnace installation). It
measures the temperature of the air leaving the indoor coil. The
sensor is to be installed downstream of the indoor coil but before
the electric heaters. It can be installed through the wall of the fan
coil or may be located entirely inside the fan coil near the blower
inlet. Anchor firmly in place with cable ties so that it cannot
interfere with the blower wheel. (See Fig. 9, 10, or 11 for
connection to Equipment Controller.)
Step 8—Final Wiring
Bring all Equipment Controller wires together at Equipment
Controller. Make all connections as indicated on Fig. 9 (for 2-zone
installations), Fig. 10 (for up to 4-zone installations), or Fig. 11
(for up to 8-zone installations).
Figures 15 through 42 show the connection between the Equip-
ment Controller and the HVAC equipment. Select proper diagram
for your equipment and connect accordingly. This connection will
require as few as 4 or as many as 7 conductors. See Table 6 to
identify the correct wiring figure.
NOTE:
Table 6 and wiring diagrams appear in sequence near the
end of this document.
NOTE:
It is good practice to mark each wire as the final
connection is made. This will preserve its identity if it is ever
disconnected.
When installing a 24-vac humidifier, connect it directly to the
HUM terminal on Equipment Controller, and C terminal of indoor
equipment. Do not use an external humidistat. All necessary
control is provided by Comfort Zone II -B.
DO NOT connect furnace HUM terminal directly to Equip-
ment Controller HUM terminal. This will bypass furnace
safety controls. See Low Voltage Wiring Diagrams and notes
for proper connection.
When using an FK or FV series fan coil, connect DHUM
(dehumidify) output directly to DH terminal of fan coil. This
output may also drive a relay (connected with other side to C)
which can be connected to reduce fan speed in other types of
blowers. The relay will be energized when humidity is normal and
will de-energize when humidity is high, calling for reduced fan
speed.
An LAT sensor must be connected in all systems. Both LAT and
HPT sensors must be connected in heat pump/fan coil systems.
Wiring Considerations
Comfort Zone II -B treats all furnaces as if they were 2-stage. For
single stage equipment, connect to W1. The same holds true for
auxiliary heat in fan coils. (Refer to Fig. 15-42.)
With any 2-stage furnace, configure the furnace so that low heat is
controlled by W1 and high heat is controlled by W1 and W2
together. This means the internal algorithm is to be disabled. See
furnace instructions.
Some variable speed furnaces have a "zoning" setting. If such a
setting exists, it should be turned on. It forces the furnace to adjust
its airflow more frequently to accommodate the effects of damper
movement. See furnace instructions.
All 2-speed air conditioners and heat pumps need to be configured
so that Y1 controls low speed and Y1 and Y2 together control high
speed in both heating and cooling. This is usually done by
selecting the "zoning" position of the stage 2 latch pot. See 2-speed
equipment instructions.
In 2-speed dual fuel applications (2-speed heat pump and furnace),
do not set the furnace interface jumper on the heat pump to ON,
even though its instructions say to do so. The necessary interlock-
ing to keep both the heat pump and furnace from operating at the
same time is done by Comfort Zone II -B.
Fig. 7—Rectangular Fibrous Glass Duct Work
A92480
ZONE
DAMPER
2
″
TO 3
″
FIBROUS
GLASS
DUCTWORK
FIELD
SUPPLIED
SCREWS
Fig. 8—Insulated Rectangular Fibrous Glass
Duct Work
A95134
1 /
″
TO 2
″
INSULATION
1 2
5
