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Step 11 — Adjust Factory-Installed Options
SMOKE DETECTORS
Smoke detector(s) will be connected at the Unit Control Board
(UCB), at terminals marked "Smoke Shutdown."
ECONOMI$ER X OCCUPANCY SWITCH
If external occupancy control is desired, connect a time clock or
remotely controlled switch (closed for Occupied, open for Unoc-
cupied sequence) at terminals marked OCCUPANCY. Detach the
jumper covering the "Occupancy" terminals on the UCB and then
attach the required connections.
Step 12 — Install Accessories
Available accessories include:
•
Roof curb
•
Thru-base connection kit (must be installed before unit is
set on curb)
•
LP conversion kit
•
Flue discharge deflector
•
Manual outside air damper
•
Two-position motorized outside air damper
•
EconoMi$er2 (without control/for external signal)
•
Power exhaust
•
Outdoor enthalpy sensor
•
Differential enthalpy sensor
•
CO
sensor
2
•
Louvered hail guard
•
Low ambient kit
•
Phase monitor control
Refer to separate installation instructions for information on
installing these accessories.
Step 13 — Fan Speed Set Up
NOTE: The Indoor Fan motor is equipped with an internal protec-
tion relay that is designed to disable unit operation if it detects a
problem. See Typical Wiring Diagram (Fig. 42 and 43) for the red
wires in the Indoor fan plug.
UNITS WITH ELECTRO-MECHANICAL CONTROLS
The fan speed set up controls are located on the lower section of
the Unit Control Board (UCB). See Fig. 54.
1.
Check the job specifications for the CFM (cubic feet per min-
ute) and ESP (external static pressure) required.
2.
Using the chart on the Fan Speed Set Up labels (see Fig. 55),
calculate the Vdc from the CFM and ESP for the base unit.
Then add Vdc for any accessories installed per the "Field
Accessories" section of the label.
NOTE: The Fan Speed Set Up labels are located on the High Volt-
age cover in the Control Box.
3.
Connect a multimeter to the Vdc terminals on the UCB.
4.
Set the Range Switch to either A, B, or C per the Switch
Range table.
5.
Using a straight blade screwdriver, turn the Vdc control dial
to fine tune the Vdc reading.
6.
Record the reading in the Field Setting field.
NOTE: Fan set-up Vdc is not affected by the operating stage of
the unit.
Fig. 54 — UCB Fan Speed Controls
38
FAN SPEED SET UP CONTROLS
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