IDC2 EVAPORATIVE CONDENSERS
MAINTENANCE
140.940-IOM (DEC 13)
Page 15
FAN MOTORS
Model Specific Fan Drive System Descriptions
Externally Mounted Motor
(Models IDC2-x-7409-x and IDC2-
x-7418-x): A belt drive system with a premium efficiency totally
enclosed motor mounted outside the airstream is provided on
these units. (
Figure 17
)
Figure 17 - Externally Mounted Motor
Internally Mounted Motor
(Models IDC2-x-1212-x, and IDC2-
1218-x): A belt drive system with a premium efficiency totally
enclosed motor mounted inside the airstream is provided on
these units. (
Figure 15b
)
Inspection and Maintenance
•
Clean the outside of the motor at least quarterly to ensure
proper motor cooling.
•
After prolonged shutdowns, check the motor insulation with
an insulation tester prior to restarting the motor.
Adjustable Motor Base
Coat the motor base slides and adjusting screws (refer to
Figures
15a
and
15b
) twice a year using good quality corrosion inhibiting
grease such as one of those recommended for lubricating the
fan shaft bearings below.
FAN SHAFT BEARINGS
Two pillow block ball bearings support the fan shaft and are
provided with extended lube lines as standard. Each bearing is
equipped with a lubrication fitting and a slinger/locking collar
to keep out moisture.
Inspection & Maintenance
•
Only lubricate the bearings with a manual grease gun. Do not
use high-pressure grease guns since they may rupture the
bearing seals.
•
Only ubricate the bearings with one of the following com-
patible water resistant greases which are suitable for ambi-
ent temperatures ranging from - 65°F (-53.9°C) to +250°F
(121.1°C).
- Amoco - Rycon Premium #3
- Chevron - SRI
- Citgo - Polyurea MP2™
- Conoco - Polyurea 2™
- Exxon - Polyrex® EM
- Exxon - Unirex N™
- MobilGrease® - AW2
- Shell - Alvania RL3™
- Shell - Alvania #3
- Shell - Dolium “R”
- SKF - LGHP2™
- Unocal 76 - Unilife Grease™
NOTICE
List of brand names is for identification only and are not
exclusive recommendations.
•
Lubricate the bearings as follows:
- Initial Start-up:
Normally, no lubrication is required since
the bearings have been lubricated at the factory prior
to shipment. However, if the evaporative condenser has
been stored at the job site or more than 1 year, both
bearings should be lubricated with new grease before
initial operation. When lubricating, purge the old grease
from the bearing by gradually adding grease until a bead
of new grease appears at the seal on the underside of
the bearing.
- Seasonal Start-up
: Purge both bearings with new grease
prior to start-up.
- Operation
: Purge bearings every 2,000 hours of operation
or once every three months, whichever occurs first.
- Extended Shutdown
: Purge bearings with new grease
prior to any prolonged storage or downtime.
WATER DISTRIBUTION SYSTEM AND HEAT
TRANSFER SECTION
CAUTION
Do not use steam or high pressure water to clean PVC
eliminators or materials other than steel.
The hot water is distributed through a corrosion resistant polyvi-
nyl chloride (PVC) spray distribution system. The drift eliminators
are made of PVC, which is impervious to rot, decay, rust, or
biological attack. Inspect and clean the spray nozzles and heat
transfer section each month.
The inspection procedure is as follows:
•
Shut off the fan and lock out and tag out the fan motor. Leave
the system pump running.
•
Remove the drift eliminators to allow a clear view of the
spray distribution system and nozzle patterns.
•
Check to see if the nozzles are all spraying consistently and
producing the spray pattern shown in
Figure 18
.
