MOTOR VOLTAGE AND CURRENT
Check the voltage and the current of all three legs of the fan and pump motors. The current should not exceed the
nameplate rating. After prolonged shut-down (or motor is stored with unit in kit form) the motor insulation should be
checked with a Megger insulation tester prior to restarting.
1. Insulation resistance test – minimum value should be 1 Mega Ohm (1.000.000 Ohms).
2. Thermistors, if fitted, should be checked for continuity with a multi-meter but never Megger-tested.
3. Ensure supply voltage and frequency correspond to the motor nameplate rating.
4. Ensure shaft turns freely.
5. Wire the motor in accordance with the wiring diagram as shown on the motor nameplate and/or in the motor
terminal box.
6. Turn on unit and check amp draw does not exceed nameplate rating.
If motor is stored, it should be in a clean, dry place & have the shaft rotated occasionally. Storage areas
should not be subject to vibration.
CAUTION
Rapid on-off cycling can cause the fan motor to overheat.
It is recommended that controls be set to allow a maximum of 6 on/off cycles per hour. When two speed motors
are used, the motor starter should include a 15 seconds time delay when switching from high to low speed.
UNUSUAL NOISE AND VIBRATIONS
Unusual noise and/or vibration are the result of malfunctioning of mechanical components or operational problems
(e.g. unwanted ice formation). If this occurs, a thorough inspection of the entire unit followed by immediate
corrective action is needed. If required, consult your local BAC Balticare representative for assistance.
Units operated with Variable Frequency Drive (VFD) might operate close to the proper frequency of the unit,
resulting in resonance. This frequency must be skipped. (Refer to "Capacity control" on page 13).
Inspections and corrective actions
GENERAL CONDITION OF THE EQUIPMENT
The inspection should focus on following areas:
•
damage of corrosion protection
•
signs of scale formation or corrosion
•
accumulation of dirt and debris
•
presence of biofilms
Smaller damages of the corrosion protection MUST be repaired as soon as possible to prevent the damage from
getting bigger. For Baltibond
®
hybrid coating use kit (part number RK1057). Larger damages should be reported to
the local BAC Balticare representative.
If there is evidence of scale formation (more than 0,1 mm) or corrosion, water treatment regime must be checked
and adjusted by the supplier.
Any dirt and debris need to be removed following the "Cleaning procedures" on page 29 .
If there is evidence of biofilms the system, including piping should be drained, flushed and cleaned of slimes and
other organic contamination. Refill system with water and apply biocide shock treatment. Check pH value and
functionality of ongoing biocide treatment.
W W W . B A L T I M O R E A I R C O I L . E U
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