McQuay 5RT90BR Montageanleitung Seite 36

The surface of actuator which is facing upward/ outside shall be labelled with 'L' symbol to ensure the rotation of
actuator modulation in clockwise direction. Fail to do so will cause errors during the operation of unit with economizer
function.
There are 2pcs of Belimo actuator, LF24-SR (item 1) in economizer kit which come together with carton boxes.
Open the boxes and recognize the label on the wire. The actuator used in step 4 is the one with label 'RA' .
2pcs of item 1 in
carton boxes.
- Then, fastens 1pc screw M4x12 (item 14) on the support bracket of the damper. Do not fully insert the screw
thread, but only insert up to 2/3 of the screw thread. Mount the actuator to the support bracket by bringing the
support bracket closer to the shaft of damper. The function of screw M4x12 is to lock the actuator from slippery
during modulation.
- Next, put the clamp into the shaft and lock the actuator with circlip. Fasten the nuts of clamp tightly by using
adjustable spanner. Noted that clamp and circlip come together with actuator as the standard parts, you may
fi nd these parts inside the actuator box.
Circlip
2pcs of Nuts
(screw tightly)
Clamp
Details view for clamp
and circlip
STEP 5
- Remove side panel. Conduct unit conversion from standard unit to downthrow unit by following the steps stated
in part (G) under chapter "INSTALLATION OF THE UNIT" in this manual.
- Then, install the return air damper (item 11) + support bracket, down throw (item 12) + Belimo actuator, LF24-
SR (item 1) which are already assembled in step 3 and step 4 into indoor base panel of the unit by using screw
M5x16 (item 13).
Extend the return air sensor which is located inside the unit (on top of return air opening) to the outside area of the
unit. This can be done by routing the sensor through small holes on support bracket, down throw (item 12). The sensor
is then located properly inside the return air duct by using the cable ties (fi eld supply). Failing to do so may aff ect the
performance of the unit and cause thermal discomfort to the users. For model EC250B and 5RT250BR, sensor routing
can be done through the small hole on metal fl ange of down throw return air opening.
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CAUTION 2
Open the box.
Circlip
Clamp
a) Mount the actuator
to the shaft of damper,
then lock with circlip and
clamp.
Item 11 and item 12,
which are already
assembled in step 3.
CAUTION
Recognize the label on the wire. One of them
is indicated with 'RA' , while the other is 'OA' .
Labelled
with 'L'
symbol
Item 1 (with label 'RA')
b) Insert screw
M4x12, then bring
the support bracket
closer to the shaft
of damper. Note:
Support bracket
support bracket is
located on the top of Fasten M4x16 screw on this hole, do not
fully insert the screw thread, but insert
damper.
OR
Detail view for actuator
Top view for damper
12
110
Ø3
150
only 2/3 of the thread.