TTV-IOM-R410A
9
Installation
Duct Connections
The supply and return ducts should be connected to the unit
with flame retardant duct connectors and the use of flexible
connectors is recommended for all duct connections in order
to reduce vibration transmission. The return duct should be
sized to the same dimensions as the return inlet of the unit.
If rigid ductwork is to be attached to the fan section, it must be
flaged and fitted with screws into the fan section discharge
face as shown in Figure 2.
Figure 2 : Duct Connection
Electrical Connections
WARNING:
WHEN INSTALLING OR SERVICING THIS
EQUIPMENT, ALWAYS EXERCISE BASIC SAFETY
PRECAUTIONS TO AVOID THE POSSIBILITY OF
ELECTRIC SHOCK THAT COULD RESULT IN SEVERE
PERSONAL INJURY OR DEATH.
1. All electrical lines, sizing, protection and grounding must
be in accordance with the National Electric Code and local
codes.
2. If conduit is used, isolate whenever vibration transmission
may cause a noise problem within the building structure.
3. Ensure all connections are tight and no wires exposed.
4. All accessories must be installed and wired according to
the instructions packaged with that accessory.
Preparation
Perform the following checks and inspections before operating
the unit:
Inspection Checklist
Duckwork connections are complete and insulated.
Coil connections are complete and tight.
Condensate drain pan connections are complete and
tight.
Electrical connections completed. Wiring is correct and
in accordance with the wiring diagram, with all connections
secure.
Ground connection completed.
Check and retighten if necessary set screws on the drive,
fan pulley, fan bearings and wheel.
Rotate fan by hand, to ensure that it runs freely and that
there is no interference.
Check that fan is centrally located in the housing, axially
and radially.
Check and retighten, if necessary, drive and bearing bolts,
motor clamp plate bolts and isolator bolts.
Check to ensure that pulley are correctly aligned and that
shafts are parallel.
Check belt tension as per instruction given in the
maintenance section.
Start-Up Procedures
After completing all installation work, the unit may be
started and the following checks and adjustments
performed:
a. Measure the motor voltage and amps on all phases to insure
proper operation. Compare these readings with the motor
nameplate.
b. Disconnect load and start motor to check the direction of
rotation. If the rotation need to be changed, stop the motor
completely and change the direction of rotation.
c. After connecting the load, the motor should start quickly
and run smoothly. If it does not, the power supply should be
switched off at once and all connections, as well as the
power supply, be re-checked before re-starting.
d. In the event of excessive vibrations or unusual noises, the
motor should be disconnected from the load and checked
for poor alignment, loose mounting bolts, etc.
e. When the motor has been operated under load for a short
period of time, check that the operating current tally with
the nameplate current.
Operation / Start-Up
