Trane CCEB - Page 83

- Check vibration isolators for proper mounting / damage (visual inspection).
- Check the protection grid (Fan in and/or outlet) if available for correct installation / dam-
aged (visual inspection).
- Check the drain (if available) for function.
- Test the wheel by rotating it by hand for abnormal noises.
- Rotate the wheel by hand and check for strange bearing noise.
- Renew both bearings if there are irregular or rough sounds.
- The theoretical lifetime, depending on the operating conditions, is at least 20,000 hours.
- The fan bearings are lubricated for life, only the large fan sizes with pillow block bearings
annually must be lubricated with adverse operating conditions according to the following
Table 8 with lithium soap grease (see Table 9). After three lubricate the bearings must
be removed, cleaned and greased again.
Ambient conditions
Temperature range °C
Lubrication interval
Clean
T < 50
6 - 12 month
50 < T < 70
2 - 4 month
70 < T < 100
2 - 6 weeks
100 <
1 week
Dusty
T < 70
1 - 4 weeks
70 < T < 100
1 - 2 weeks
100 < T
1 - 7 days
Extreme humidity
1 week
Table 8: Lubrication intervals for fan bearings
Figure 129: Fan bearing with grease nipple
(example Comefri NTHZ)
Supplier
Type
Basis
Temp. range
FINA
Marson HTL 3
Lithium
30°C / +120°C
SHELL
Alvania Fett 3
Lithium
-20°C / + 130°C
ESSO
Beacon 3
Lithium
-20°C / + 130°C
MOBIL
Mobilux EP3
Lithium
-30°C / + 130°C
Table 9: Recommended grease types