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d. Use at least a 15º fan type of spray nozzle.
Figure 51. Sprayer source angle
Note: To avoid damage from the spray wand contacting
the coil, make sure the 90º attachment does not
come in contact with the tube and fin as abrasion to
the coil could result.
Free-Cooling Option Maintenance
Free-Cooling Coil Cleaning
Follow coil cleaning procedures found in
free-cooling microchannel coils.
Free-Cooling By-Pass Valve Adjustment
For intervention on free-cooling by-pass valve it is
recommended to consult the valve service literature. For
every new referencing of the motor end travel, an
adaptation of the motor should be done by pushing button
2. To change the bypass percentage, follow procedure
below:
•
No tuning is needed on free cooling valve which
always stays on full open/close.
•
For Belimo bypass valve, minimum opening can be
adjusted by pushing the release button (4) and by
turning handle 5 to 50% opening for instance (45°).
Figure 52. Belimo operating controls and indicators
Adaption
4
RTAF-SVX001K-EN
Figure , p. 74
Y1
1
Y2
2
Power
3
Status
5
Table 30. Belimo operating controls descriptions
Ref
Description
Direction of
1
Rotation Switch
Push-button and
2
LED display
(green)
Push-button and
3
LED display
(yellow)
Gear
4
disengagement
button
5
Service Plug
for
Check Power
2 and 3
Supply Connection
Use a Phillips screwdriver to make adjustments. Setting
should keep an opening between minimum desired, and
100%. See figure below for an example with 50% setting.
Figure 53. By-pass valve setting
Figure 54. By-pass valve setting photo
If the minimum opening is modified after unit start-up,
motor recalibration is needed to validate new operating
range. When motor is powered, push green LED button (2).
Motor memorizes the new reference of end of travel
position on its signal (2-10 VDC).
Maintenance
Setting
Action
Switch
Direction of Rotation
Over
Change
No power supply or
Off
malfunction
On
In operation
Triggers angle of rotation
Press
adaption, followed by
Button
standard mode.
Off
Standard mode
Adaptation or synchronizing
On
process active
Press
No function
Button
Gear disengages, motor
Press
stops, manual override
Button
possible
Gear engages,
Release
synchronization starts,
Button
followed by standard mode
For connecting
parameterization and
service tools.
2 Off and
Possible wiring error in
3 On
power supply
75
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