6
AIR14-501.2
START-UP PROCEDURE
IMPORTANT
1. Start-up and adjustment procedures should be performed
by a qualified service agency.
2. No water-flow can cause a freeze condition resulting in
damage to the coil.
3. Never leave the unit filled with water in a building without
heat unless antifreeze has been added.
START-UP PROCEDURE
See start-up sheet examples - Figures 9.1 and 10.1.
Pre-Start Checks
1. Check that the supply voltage matches the unit supply
voltage listed on the Unit Serial Plate. Verify that all wiring is
secure and properly protected. Trace circuits to insure that
the unit has been wired according to the wiring diagram.
2. Check that the unit has no visible damage and that all the
components are secure.
3. Check that all field electrical and mechanical work has been
performed according to all applicable Federal, State, and
Local codes.
4. Check the supply voltage to the unit is /- 5% of the
voltage on the unit serial plate.
5. Check that the system has been correctly flushed.
6. Check for any water leaks.
7. The unit and interconnecting piping have been evacuated
correctly and the condensing unit service valves are open
(DX Cooling units only).
8. Check that the plug is installed for the condensate
connection that is not being used.
10. Check that the motor is secure and the shaft and blower set
screws are tight. Rotate the blower shaft by hand.
11. Check that the filters have been properly installed.
Unit Start-Up Procedure
Note:
For models with DX Cooling, see the installation and
maintenance manual provided with the condensing unit for start-
up information.
1. (DX Cooling models only) Ensure that the condensing unit
start-up procedure has been carried out, as detailed in the
condensing unit installation and maintenance manual.
2. (DX Cooling models only) The compressor should be
isolated by removing the connection at the Y1 terminal
on the indoor unit. Main power can now be applied to the
indoor and outdoor units. A system electrical check can now
be carried out.
3. Switch the 3-speed switch to position 1, 2 or 3.
4. Switch the disconnect switch to the “ON” position.
5. Confirm that the blower motor is rotating in the correct
direction and blowing air out of the supply air grill.
6. (Units with Chilled Water, Hot Water and Steam coils only)
Ensure all valves are open to the unit.
7. (Units with Chilled Water and Hot Water only) Check water
flow rates and pressure drops and compare to design.
8. Check that the dampers are not obstructed and move
through their full range of motion.
9. During the unit operation, measure and record all the
information that is required to complete the Start-Up Sheets
that are supplied with the unit. Copy the information onto the
Start-Up Sheets (Figures 9.1 and 10.1) in this manual for
your records.
10. (DX Cooling models only) Shut unit down and disconnect
the main power. The compressor signal Y1 (disconnected
from the indoor unit in step 2) can now be re-connected and
main power applied to the system.
Note:
(DX Cooling models only) The 24V power for the indoor
unit control circuit is supplied from a unit factory-installed
transformer. When the indoor and outdoor units are supplied
from separate main supplies, care must be taken to ensure that
the outdoor unit is isolated whenever the indoor unit power is
removed. Failure to do so may result in freeze ups and other
damage to the unit.