Carrier 39TF Manual page 20

• No short connection of the lines for the unit protection device shall be conducted. Otherwise, this may lead to the unit failure.
• The internal cables of the unit shall be protected properly to prevent the insulation layer from damage due to sharp objects.
The wire and cable shall be kept far away from the heat source and they shall not be bent or twisted
• Air filter
The accumulated dust of the unit strainer shall be inspected regularly (twice for each month as recommended). Users who
have installed differential pressure detector shall clean or replace the filter in case the final resistance reaches the specified
value and CARRIER suggests that the final resistance value shall be:
• Heat exchanger
The coil fin, copper pipes, etc. of the heat exchanger shall be free from scratch or flattening due to impact. The coil shall be
kept clean and the coil fin can be brushed and washed with the nylon brush. It shall be cleaned with the vacuum cleaner
before brushing. In case of the compressed air, the coil may be cleaned with the high-pressure air pipe or nozzle. Upon the
cleaning of the coil, its external surface shall be free from dust and the heat transfer effect of the internal surface shall reach
its initial updating and heat transfer capacity. Besides the fin cleaning, internal incrustation shall be washed and removed from
the coil after the coil has been used for 2~3 years. The cold water and hot water for the unit coil shall be softened water.
• The belt tightness shall be readjusted after the unit has operated for one week and the regular inspection shall be conducted
every three months of operation in future.
• The wiring pile head of the wire will be loosened after the unit operates for a certain time. It shall be inspected and tightened
on the third day upon the first startup.
• Bearings for the fan and the motor shall be inspected regularly (three times per month as recommended). The seal ring of the
motor bearing (for instance, V-seal ring) shall be inspected, and it shall be replaced timely if necessary; the erection joint shall
be inspected to confirm whether it is loose; the bearing operation shall be inspected through monitoring the abnormal noise,
vibration, oil consumption or with the bearing vibration measurement element, etc. In case of any abnormalities, the unit shall
be shut down immediately, and causes shall be identified and eliminated timely. Heating shall be conducted or special tools
shall be used for the assembly and disassembly of bearings and bearings shall not be knocked violently or moved.
• Servicing of fan bearing:
For fans with the oil nozzle, the lubricating oil of matching specification shall be filled into the bearing regularly.
In case that the users select the grease of the same designation for grease filling, they shall use the grease of the designation
all the time.
• The validity of the lubricating grease depends on the grease type, revolving speed of bearings, bearing diameter and operating
environment. Under normal conditions, the lubricating grease shall be replaced after the fan has operated for about 1,500 h;
For fans in 24-hour operation, the lubricating grease shall be replaced upon 500~700-hour operation.
• Methods for lubricating oil filling: the bearing shall keep rotating during the grease filling, and in case that a layer of fresh
grease overflow from the dust cover, the grease filling may be stopped and the wind wheel shall be rotated quickly manually to
discharge excessive grease.
20
CARRIER
specification of filtration efficiency
G3
G4
M5-M6
suggested final resistance (Pa)
100-200
150-250
250-300