System Start-Up; Inlet - Greenheck VFCB Installation, Operation And Maintenance Manual

System Start-Up

For proper unit function and safety, follow everything
in this start-up procedure in the order presented.
This is to be done after the electrical connections are
complete.
PRE-START CHECK LIST
1. Disconnect and lock-out all power switches to
fan.
2. Check all fasteners, set screws and locking
collars on the fan, bearings, drive, motor base
and accessories for tightness.
3. Rotate the fan wheel by hand and assure no
parts are rubbing.
4. Check the V-belt drive for proper alignment and
tension.
SPECIAL TOOLS REQUIRED
• Voltage Meter
• Tachometer
• Amperage Meter
1. Check Voltage
Before starting the unit, compare the supplied voltage
with the unit's nameplate voltage and the motor
voltage. Units are not provided with thermal overload
protection unless a control center has been ordered
with the unit or the motor has been selected with
thermal overload protection.
2. Check Blower Rotation
If the blower is rotating in the wrong direction, the
unit will move some air, but
ON
will not perform properly. To
check the rotation, open the
blower access door and run
AIRFLOW
the blower momentarily to
determine the rotation.
To reverse the rotation, turn the power off and use the
following procedure:
• For single phase units, rewire the motor per the
instructions on the motor.
• For three phase units, interchange any two
power leads. This can be done at the motor
starter.
3. Check for Vibration
Check for unusual noise, vibration or overheating of
bearings. Excessive vibration maybe experienced
during initial start-up. Left unchecked, excessive
vibration can cause a multitude of problems, including
structural and/or component failure. Many conditions
can be discovered by careful observation. If the
problem is wheel unbalance, in-place balancing can
be done providing there is access to the fan wheel.
Generally, fan vibration and noise is transmitted to
other parts of the building by the ductwork. If noise
is an issue, we recommend using heavy canvas
connections on the inlet of the fan. Refer to the
Troubleshooting section of this manual if a problem
develops.
8
Model VFCD/VFCB Vertical Fan Coil
4. Air Volume Check and Measurement
Along with the building balance, the unit's air volume
(cfm) should be measured and compared with its
rated air volume. This unit is flexible for varying air
volume, but the actual air volume should be known for
making final adjustments. The most accurate way to
measure the air volume is by using the pitot traverse
method in the ductwork away from the blower. Other
methods can be used, but should be proven and
accurate. To adjust the air volume, change the fan rpm
or the system losses. See Troubleshooting section in
this guide.
5. Measure Motor Voltage, Amperage
All access doors must be installed. Measure and
record the input voltage and motor amperage(s).
To measure the fan RPM, the blower door will need to
be removed. Minimize measurement time because the
motor may over amp with the door removed.
Compare measured amps to the motor nameplate
full load amps and correct if over amping. See the
Troubleshooting section in this guide.
ON
AIRFLOW
and Fan RPM
®