Please ensure the unit is isolated before
removing the cover.
Electrical connection
Note that the mains wiring for the unit MUST be from a fixed
wiring installation.
The fan is designed to be wired direct to the mains supply through
a fused spur isolator (by others).
It may be found easier to remove the terminal block and filter
grilles and any inlet spigots from the case to wire in the unit
(See figure 6).
NB. The earth wire MUST be connected to the Earth post
provided next to the block. (Figure 6). No earth is required to
the terminal block.
Refer to the electrical wiring diagram on page 5 when connecting
the unit. When the wiring is completed the unit can be
re-assembled as follows:
The blower assembly complete with the electronic control module
can now be offered into the case. Push the module down to
locate the spade terminals into the block before fixing the blowers
to the back of the case. (Figure 5).
Note: Do NOT overtighten the blower retaining screws as the
fixing lugs may break if excessive force is used.
Warning: Before fitting the front cover ensure that the LEDs
on the module correctly align with the two small holes in the
cover.
Refit any inlet grilles/spigots and ducting that was removed.
Test / Run the unit.
Adjusting the Full Speed (boost)
All the control functions and adjustments are located on the
Electronic Control Module.
The ‘Full Speed’ adjustment is located on the Electronic Control
Module (see figure 7). The adjustment range is 50 - 100% speed.
Set to 100% for optimum performance.
Note the screw adjustment is pre-set at the factory to full
speed (100%).
The performance of the unit can be reduced if required by rotating
the screw anti-clockwise. (Fully anti-clockwise will give 50% of
the available duty).
Adjusting the Low Speed (normal)
trickle ventilation
The ‘Low Speed’ adjustment (used for trickle ventilation) is located
on the Electronic Control Module (see figure 7).
The adjustment range is 0 - 50% speed.
Note the screw
adjustment is preset at the factory to zero and MUST BE SET
TO 25%.
The remote switch connection must be made in order to use the
‘BOOST’ facility. The switch terminals are numbered 3 and 1 on
the terminal block. (See wiring diagram).
Note: connection of a voltage source to these terminals will
damage the control module.
Run On Timer (not used)
A Run On Timer adjustment is also located on the Electronic
Control Module. Its function is not required for this unit.
Note the unit is delivered with the run on timer screw set to
zero. The run on facility is not required in these applications
and should be left set at zero.
Electrical Data
Unit power consumption
(watts) @ full speed
MEVB 100 watts
MEV-2B 100watts
MEV-B+ 200watts
Installation and Maintenance
MEV-B Continuous Mechanical Extract Ventilation Units
Figure 7. Control adjustments on electronic module.
4
24. 06. 13. Leaflet Number 671078
Electrical
terminal
block
Earth
post
Cable
access
335
160 fixing ctrs
320
2
48 fixing ctrs
Blower assy
fixing inserts
Figure 6. Internal view showing terminal block etc.
Electronic control
module
Run On Timer
(Not used)
Fail LED
Run LED
Low Speed
(trickle vent)
0 - 50%
Full Speed
50 - 100%
NORMAL
BOOST
Full load current
(amps).
MEV-B 0.39 amps
MEV-2B 0.39 amps
MEV-B+ 0.78 amps
Cable
access
Electronic
control
module
Blower assy
fixings
Figure 5. Internal view showing blowers and electronic module.
