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10. MAINTENANCE
10.1 WARRANTY
A precondition of the warranty is that regular maintenance has been carried out. Defects under warranty must
immediately be notified to the manufacturer or the importer. The warranty does not cover service work or indirect
damages.
10.2 MAINTENANCE
10.2.1 BEFORE MAINTENANCE
Switch off the power supply to the fan and hatch actuator motors at the safety isolating switches. Note: the hatch
(lid) stays open when the unit isolator switches are used to disconnect it from the mains electrical supply. However,
make sure that hatch cannot fall and close during maintenance.
10.2.2 INSPECTION INTERVALS
Inspection intervals can be defined by local authorities. If this is not defined, the fan must be tested according to
the intervals in table below, at least once a year. The annual inspection must be done by authorised personnel
only. Also follow the separate JMHT fan operation manual instructions for maintenance on the fan inside the
casing.
Pos
Description
Check that the hatch opens properly and the supply of
1
replacement air is ensured.
Check that the fan motor starts 30s after the hatch
2
opening motors
Check that the hatch motor is de-energised after
3
3 min. start-up
Check that the fan rotates properly
4
(and in the right direction)
5
Check that all warning/alarm lights are OK
6
Check that all labels are correct and visible
7
Visual inspection of fan motor and hatch opening motors
8
Test run of the fan
9
The entire product has been inspected for damage
10
Make an inspection report
11
Make a maintenance report
Fan motor
1
During the test run, check the bearings for abnormal noise
2
If needed, lubricate the bearings
3
Check that the impeller rotates properly
4
Perform a visual inspection.
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Introduction
6 months
12 months
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
10.2.3. CHECKING THE MOTOR BEARINGS
The fan motor should be operated during test runs, maintenance or in emergency conditions only. The motor
bearings need to be lubricated and serviced in accordance with the instructions that accompany the motor.
As motors are designed for use in a Fire Safety product, they should not be repaired by local repair Engineers.
The complete motor or fan/motor unit should be replaced.
10.2.4. IMPELLER
CAUTION!
The impeller must be clean.
10.3. REPLACING THE MOTOR AND IMPELLER
The fan will have to be disconnected from the unit before the motor can be replaced.
SMHA-031,040,050,080,090
1. Check that the fan motor and hatch motors are disconnected from the mains.
2. Remove outlet safety guard.
3. Remove the impeller from the motor shaft by loosening the locking screws from the shaft end.
4. Remove the hub from the shaft. Please take care and ensure it does not fall through the casing.
5. The motor rotor can be lifted so that the bearings can be checked or replaced.
SMHA-sizes 100-125
1. Check that the fan motor and hatch motors are disconnected from the mains.
2. Remove outlet safety guard.
3. Remove the complete fan and lift it outside the casing for maintenance.
4. Follow the maintenance instructions for the JMHT fan.
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