140.960-IOM (JUN 2016)
Page 43
IDCF & IDC3 EVAPORATIVE CONDENSERS
MAINTENANCE
MAINTENANCE
FAN
The IDCF and IDC3 models use axial fans. Thoroughly inspect
the fans for damaged or deteriorated fan blades and replace
the fan as required.
Inspection and Maintenance
• If the unit is already in operation, while the fans are still
running, check for any unusual noise or vibration.
• With the fans off and the motor disconnected, locked out
and tagged out, check the general condition of the fans:
1. Inspect for any loose or missing bolts in the fan shaft
bushing, fan hub, and fan shaft bearing(s).
2. Check if the fan blades are loose, first by twisting the
blade by hand; and then, by moving the blade tip up and
down. There should be no play or slippage.
3. Inspect each blade for excessive scale buildup that
could cause vibration.
4. Check each blade, in the area of the shank, for any signs
of cracking. If cracking is found, the fan motor should
be locked out immediately. Contact your local Frick
Representative for assistance.
•
Tip Clearance
: Check the clearance between the tip of the
blade and the fan cowl. The clearance should be within
1/8" and 1/2" for all models except IDCF/IDC3 models 0406
and 0412 which should be between 3/32” and 1/4”.
•
Drain Holes
: On hollow blades, the drain hole in the blade
tip should be unobstructed. TIP: Use a piece of wire to
probe the hole.
•
Blade Pitch
: Check to ensure that the blades are all at
the same pitch. If uncertain, measure the pitch with an
inclinometer. All blades should be within 1/2° of each
other.
•
Rotation
: Turn the fan shaft by hand to ensure that the
shaft moves freely with no rough spots, binding or other
malfunctions that could cause vibration or fan motor
overload. While rotating the fan, check the blade tracking.
All blades should track within a 1/2" band at any single
point around the cowl.
•
Direction of Rotation:
On initial start-up, or if the fan
motor has been rewired, briefly energize the fan motor
and note the direction of rotation. It should rotate in the
direction indicated by the arrow on the fan cowl. On units
with independent fan motors, check the rotation of each
fan.
NOTICE
Check to ensure the controls for the fan motor are set to
allow a maximum of six on-off cycles per hour to prevent
motor overload.
•
Operation
: On initial start-up, run the fan in the manual
position for several minutes and check for any unusual
noises or vibration.
WATER BASIN
The water basin is constructed from one of the following materi-
als, and the following maintenance applies to all basin materials
of construction:
• Galvanized steel
• TripleGuard™ Corrosion Protection System
• Welded Type 304 stainless steel
Water Levels
TABLE 6: WATER BASIN WATER LEVELS
Product
Model Number
At Overflow
Level (in.)
At Operating
Level (in.)
IDCF
All models except:
11"
8"
1218, 1236, 2418, 2436
1218,1236, 2418, 2436
12¼"
8¾"
IDC3
0406, 0412
11"
7"
0709, 0718, 1012, 1024,
1212, 2412, 2424
12½"
8"
1218, 1236, 2418, 2436
13"
8½"
*Measured from inside the water basin.
• The makeup valve controls the operating level, which is
maintained at the levels shown in Table 3.
• The operating water level in the water basin will vary with
system thermal load (evaporation rate), the bleed rate
employed, and the makeup water supply pressure.
• Check the operating water level monthly, and readjust
the float when necessary to maintain the recommended
operating level.
• Consult "Water Level Control" for information on how to
set and maintain the basin operating level.
Inspection and Maintenance
• Inspect the water basin monthly. Remove trash or debris
accumulated in the basin or on the strainer.
• Quarterly, or more often if necessary, drain, clean, and
flush the entire water basin with fresh water. This will
remove the silt and sediment, which normally collects
in the basin during operation. If not removed, sediment
can become corrosive and cause deterioration of the
protective finish of metallic basins.
• When flushing the basin, leave the strainers in place to
prevent the sediment from re-entering the system.
• Remove the strainers after the basin has been flushed.
• Clean and replace the strainers before refilling the basin
with fresh water.
• Adjust the float to maintain the design operating level. See
Table above.
WARNING
Openings and/or submerged obstructions may exist in the
bottom of the water basin. Use caution when walking inside
this equipment.
