Daikin Applied (UK) Ltd.
REV A
– PAGE 9. SECTION 11 ADDED. 11/03/14
Page 24 of 37
Electric Motors
It is advisable to have a monthly inspection of the motor operation.
Regular cleaning of the motor is necessary during its service. Care must be taken to
prevent moisture, dust, etc. from entering the motor.
Ensure that adequate grease lubrication is provided for the bearings when the motor is
in operation. Grease lubricant should, in general, be replaced every six (6) months or
immediately under the following conditions.
-
Lubricant grease hardened or darkened.
-
Accumulation of water drops, dust or dirt on the grease surface.
-
Overheating of the bearings.
When replacing the grease, the bearings should be cleaned and rinsed thoroughly with
gasoline or kerosene after the old grease has been cleaned out. The bearing housing
should then be filled with new grease to 2/3 of its volume.
This is very important as impaired lubrication will result from either insufficient or
excessive grease.
Built-in lubricating cups and grease relief holes are provided inside both end brackets.
Ball-bearing motors are shipped with sufficient grease for a long operating period. If re-
lubrication is needed, using a low pressure hand-operated grease gun, pump in clean
recommended grease until the new grease appears at the relief hole.
In some cases, when requested, a lifting beam is installed inside the air handling
unit to facilitate the fitting and removal of electric motors.
Inspection of the lifting beam, and any ancillaries, should be done in accordance
with current LOLER regulations.
Electric Coils
These should be wired up in accordance with I.E.E. Regulations and local by laws. It is
essential that the heater contactor is interlocked with the fan starter to prevent the
heater being energised when the fans are not running. Additionally a
‘fan run on’ facility
should be included within the controls to dissipate heat from the battery at the end of
operation. All heater batteries incorporate a high temperature safety cut-out which must
be wired into the controls system. The safety cut-out temperature should be pre set at
approximately 10ºC above the operating temperature of the heater. Ensure the size of
cable and contactors are suitable for the load being carried. It is not recommended for
PVC cable to be run into the terminal box. The cable should be insulated with high
temperature sleeving.
