Set Up For Optimum Control; Air Balancing - Daikin DPS005 Installation And Maintenance Manual

Set Up for Optimum Control

The Outdoor air sensor must be calibrated.
• Compare the MicroTech III OAT reading to an external
temperature measuring device . See
85 on page 118 go to the Quick Menu and OA Temp
[ pink path.]
• If there is more than 1 .0°F difference between the
two readings [Note the OAT reading should be taken
after the outdoor fans have been running for at least
1 minute .] then correct this difference on the keypad .
Go to Service Menus (Appendix,
Figure 84 on page 116), Sensor Offsets [
path,] find OA temp, and make the required adjustment.
The adjustment has a range setting of +/– 10 .0°F .
Proper discharge and suction super heat is critical
• Suction super heat is monitored at the display
screen . Appendix, see
Figure 83 on page 114, go to commission unit, expansion
valve set up, and super heat [
• Discharge super heat is not shown directly but is
the difference between discharge temperature and
saturated discharge temperature and both can be
monitored at the display screen . See
Figure 83 .
— Go to commission unit
set up, and disch sat tmp [
— Go to view/set unit
temperatures, DRT1 [inverter compressor] and DRT 2
[fixed speed compressor] [
• If, after all motor speeds are constant +/– 5 hz for 15
minutes for either compressor, suction superheat
drops below 5°F, or discharge superheat drops below
18°F, or discharge superheat drops below 30°, then
proceed as follows .
— Set the SS Hi Base to 2°F . See
83, go to commission unit, expansion valve set up,
and SS Hi Base [
— Contact the factory to diagnose why super heat is
too low .
• If super heats do not reach steady state [less than
10°F variation for 2 minutes] then
— Set the SS Hi Base to 2°F . See
83. Go to commission unit, expansion valve set up,
and SS Hi Base [
— Contact the factory to diagnose why the unit is
hunting .
www.DaikinApplied.com
Appendix, Figure
Figure 81 and then
orange
Figure 81 and then Appendix,
yellow path.]
Figure 81 and
(Figure 83), expansion valve
yellow path.]
(Figure 81 and Figure 82),
green path]
Figure 81 and
yellow path.]
Figure 81 and
yellow path.]

Air Balancing

Moving machinery
personal injury or death . Do not use a mechanically
driven tachometer to measure the speed of return fans
on this fan arrangement. Use a strobe tachometer.
The following should be performed by a qualified air balancing
technician:
1 . Check the operating balance with the economizer
dampers positioned for both full outdoor air and minimum
outdoor air .
2 . Verify that the total airflow will never be less than that
required for operation of the electric heaters or gas
furnace.
3 . When the final drive adjustments or changes are
complete, check the current draw of the supply fan
motors. The amperage must not exceed the service factor
stamped on the motor nameplate
Minimum and maximum airflow/rpm settings can be adjusted
using the MicroTech III controller. Refer to OM 1141 for details.
Figure
Figure
95
C , T s
heCk esT and TarT
WARNING
hazard . Can cause
IM 1125-7 • REBEL ROOFTOPS
p
roCedures
severe