Euroclima ZHK, Manual

Page: 111 / 142

Instruction Manual ZHK
110/140 V07-21.0
During operation of the AHU, an excessive vibration level can occur due to an unfavorable air flow,
accumulation of dirt and dust, lack of and / or incorrect cleaning and maintenance. Furthermore,
vibrations can be transmitted from and to external system components.
The fan-motor-unit must be monitored regularly for mechanical vibrations according to the fan-mo-
tor-unit manufacturer's specifications, and the results must be recorded. The maximum vibration
speed according to the fan-motor-unit manufacturer's specifications must be strictly observed and
followed. If the admissible vibration values are exceeded, the cause must be identified immediately
and urgent, appropriate measures put in place to rectify the situation.
9.2.2 Fan
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Check for dirt, debris, damage and corrosion, clean if necessary.
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Coat surface damage of the housing and impeller with zinc dust paint.
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Flexible connections are to be checked for damage through visual inspection.
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Check vibration isolators for proper mounting through damage (visual inspection).
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Check the protection grid (Fan in and/or outlet) if available for correct installation / damaged
(visual inspection).
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Check the drain (if available) for functionality.
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Test the wheel by rotating it by hand and listen for abnormal noises.
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Rotate the wheel by hand and check for strange bearing noise.
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Renew both bearings if there are irregular or rough noises.
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The theoretical lifetime, depending on the operating conditions, is at least 20,000 hours.
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The fan bearings are lubricated for life. Except the pillow block bearings of larger fans, with de-
manding operating conditions because these should be lubricated annually in accordance with
Table 17.
This should be done with lithium soap grease. See
Table 18
for recommended
grease types. After three separate lubrications the bearings must be removed, cleaned and
greased again.
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After dismantling and reinstalling an impeller, the fan must be checked for mechanical vibra-
tions. It may be necessary to rebalance this for efficient use.
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 17:
Lubrication intervals for fan bearings