37
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$ER X OCCUPANCY SWITCH
If external occupancy control is desired, connect a time clock
or remotely controlled switch (closed for Occupied, open for
Unoccupied sequence) at terminals marked OCCUPANCY.
Detach the jumper covering the “Occupancy” terminals on the
UCB and then attach the required connections.
Step 12 — Install Accessories
Available accessories include:
• Roof curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• LP conversion kit
• Flue discharge deflector
• Manual outside air damper
• Two-position motorized outside air damper
• EconoMi$er2 (without control/for external signal)
• Power exhaust
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO
2
sensor
• 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. 41) for the red wires
in the Indoor fan plug.
UNITS WITH ELECTROMECHANICAL CONTROLS
The fan speed set up controls are located on the lower section
of the Unit Control Board (UCB). See Fig. 52.
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. 53),
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. 52 — UCB Fan Speed Controls
Fan Speed Set Up Controls
Summary of Contents for Legacy 547K 14
Page 4: ...4 Fig 2 547K 14 Unit Dimensional Drawing...
Page 5: ...5 Fig 2 547K 14 Unit Dimensional Drawing cont...
Page 8: ...8 Fig 5 547K 14 Roof Curb Details...
Page 21: ...21 Fig 41 Typical Control Wiring Diagram Electromechanical with W7220 Controller...
Page 22: ...22 Fig 42 Typical Power Wiring Diagram 208 230 460 3 60 Unit Shown...
Page 23: ...23 Fig 43 Typical Power Wiring Diagram 575 3 60 Unit Shown...
Page 41: ......
