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For rotary recuperators the causes may be:
- dust and dirt on the heat exchanger block
- abnormal bypass of air on recuperator
- formation of frost on enthalpic recuperator in
particularly damp and cold climates
- broken rotor driving belt or blocked reduction gear
motor.
For twin exchanger recuperators the causes may be:
- dust and dirt on exchangers
- formation of air in the circuit
- blocked circulating pump.
6.8.5. Reduction in humidifier efficiency
Depending on the system used, the cause may be:
- scale clogging the spray nozzles
- scale on the cell block
- clogged lifting pump rotor and resulting reduction in
water flow rate
- clogged water filter
- malfunction of float.
6.8.6.
Abnormal noise
With regard to the fan, the causes may be:
- worn or defective bearings
- fan off-balance
- foreign matter in fan wheel.
With regard to the electric motor; the causes may be:
- worn or defective bearings
- loose cooling fan and/or fan guard
- magnetic noise during frequency reductions with
inverter (applications below 22 Hz are not recommended
as a rule).
With regard to the drive system, the causes may be:
- slipping of belt
- worn belt
- misaligned pulleys
- pulley with play on key.
In order to remedy the malfunctions listed above (and not
the entire conditioning system), CONSULT CHAPTER 6 -
MAINTENANCE OR, IF THE PROBLEM PERSISTS,
CONTACT OUR TECHNICAL DEPARTMENT
6.9.
MAINTENANCE AGREEMENT
On request, TCF Srl is willing to study preventive and
annual maintenance agreements on its Air Treatment
Units so as to provide the customer with excellent
efficiency, purity and hygiene throughout the machine's
working life.
7.
SAFETY
7.1.
SAFETY-RELATED
TREATMENT UNIT
TCF Srl has fitted its Air Treatment Units with every
possible safety feature to prevent accidents, especially
during start-up and maintenance.
Some of these SAFETY FEATURES are listed below:
- INSPECTION DOORS THAT CAN ONLY BE OPENED
WITH A KEY are installed in the sections housing rotating
parts and drives
- the GRATES and HOUSINGS protecting rotating parts
and drives can only be removed with a key
- on Units larger than our model 20, in which the operator
can enter the ventilation section for inspection purposes,
an ELECTRICAL KNIFE SWITCH is fitted standard inside
it. The purpose of the switch is to prevent the fan motor
assembly from being activated when someone is inside
the Unit
- the outside of the structure has ROUNDED EDGES
- elimination of sharp-edged steel sheet parts inside and
outside the Unit
- use of SELF·TAPPING SCREWS WITH NON-PROJECTING
TIP inside sections and panels.
7.2.
SAFETY NOTICES APPLIED TO THE UNITS
The inspection doors of the Air Treatment Unit carry
SAFETY NOTICES drawing the operator's attention to the
danger connected with moving parts and warning him to
disconnect the system power before opening the
inspection doors (Hg.41).
7.3.
Practical accident-prevention tips
- Open the inspection doors only when the fan is at a
standstill
- Before carrying out maintenance work on the fan motor
unit, make sure that the motor cannot be restarted by
accident
- Before working on the motor; make sure that it has
cooled completely
- in order to protect your hands, use a lever to remove the
belts
- Block the fan wheel before carrying out maintenance
work on it, since (especially when the belt is removed)
the updraft caused by the ducting could make it turn and
cause injury
FEATURES
OF
AIR
27
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