114
IM 738-2
Maintenance:
Gas Furnace
Preparation
Supply (and Return) fans
1
Move the motor base to check and lubricate slides and
leadscrews.
2
Remove the drive belts, tag them with the fan name and
unit serial number, and store them in a conditioned space
out of direct sunlight.
3
Once every two weeks, rotate the fan and motor shafts.
Mark the shaft positions first to make sure they stop in a
different position.
4
Depending on local climatic conditions, condensate may
collect on components inside the units. To prevent surface
rust and discoloration, spray all bare metal parts with a rust
preventive compound. Pay close attention to fan shafts,
sheaves, bearings, and bearing supports,
Cabinet Sections
Once a month, open a door on each section and verify that no
moisture or debris is accumulating in the unit.
Cooling circuits
The steps below are necessary only if the unit has been started.
1
Provide that each circuit is properly pumped down.
2
Pull the fuses to each compressor (store them in the control
cabinet)
3
Close all the refrigerant service valves on each circuit
4
Tag the valves as a warning for the technician who restarts
the units
Gas Furnace
If the unit is equipped with a gas furnace, close the gas shutoff
valve and open furnace control switch S3.
Control Compartment
1
Daikin Applied
recommends that the electronic
control equipment in the unit be stored in a 5% to 95% RH
(non-condensing) environment.
2
It may be necessary to put a heat source (light bulb) in the
main control panel to prevent the accumulation of
atmospheric condensate within the panel.
3
The location and wattage of the heat source is dependent on
local environmental conditions.
4
Check the control compartment every two weeks to provide
that the heat source is functional and is adequate for current
conditions.
Restart
After extended storage, perform a complete start up. Inevitable
accumulations of dirt, insect nests, etc. can contribute to
problems if not cleaned out thoroughly prior to start up. In
addition, thermal cycling tends to loosen mechanical and
electrical connections. Following the startup procedure helps
discover these and other issues that may have developed
during the storage interval.
Gas Furnace
For information on maintenance of the gas furnace, refer to
Bulletin No. IM 684 or IM 685.
Bearing Lubrication
Motor Bearings
Supply and return fans
—Supply and return fan motors
should have grease added after every 2000 hours of operation.
Use one of the greases shown in Table 25 on page 115. Using
the following procedure, relubricate the bearings while the
motor is warm, but not running.
1
Remove and clean upper and lower grease plugs.
2
Insert a grease fitting into the upper hole and add a small
amount of clean grease with a low pressure gun.
3
Run the motor for five minutes before replacing the plugs.
Note:
Specific greasing instructions are located on a tag
attached to the motor. If special lubrication instructions
are on the motor, they supersede all other instructions.
Condenser fan—
Condenser fan motors are permanently
lubricated and require no periodic lubrication.
CAUTION
Bearing overheating potential. Can damage the equipment.
Do not overlubricate bearings.
Use only a high grade mineral grease with a 200°F safe
operating temperature. Refer
to Table 25 on page 115 for
specific recommended lubricants.
Summary of Contents for RDT-135c
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