Maintenance
RTAF-SVX001K-EN
75
d. Use at least a 15º fan type of spray nozzle.
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
for
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°).
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.
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).
Figure 51.
Sprayer source angle
Figure 52.
Belimo operating controls and indicators
Y1
1
2
3
4
5
Y2
Adaption
Power
Status
Table 30. Belimo operating controls descriptions
Ref Description
Setting
Action
1
Direction of
Rotation Switch
Switch
Over
Direction of Rotation
Change
2
Push-button and
LED display
(green)
Off
No power supply or
malfunction
On
In operation
Press
Button
Triggers angle of rotation
adaption, followed by
standard mode.
3
Push-button and
LED display
(yellow)
Off
Standard mode
On
Adaptation or synchronizing
process active
Press
Button
No function
4
Gear
disengagement
button
Press
Button
Gear disengages, motor
stops, manual override
possible
Release
Button
Gear engages,
synchronization starts,
followed by standard mode
5
Service Plug
For connecting
parameterization and
service tools.
2 and 3
Check Power
Supply Connection
2 Off and
3 On
Possible wiring error in
power supply
Figure 53.
By-pass valve setting
Figure 54.
By-pass valve setting photo