Daikin DPS007 - Set Up for Optimum Control; Proper discharge and suction super heat is critical; Air Balancing

CheCk, TesT and sTarT proCedures
www.DaikinApplied.com 95 IM 1125-7 • REBEL ROOFTOPS
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 Appendix, Figure
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 81 and then
Figure 84 on page 116), Sensor Offsets [ orange
path,] nd 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 81 and then Appendix,
Figure 83 on page 114, go to commission unit, expansion
valve set up, and super heat [ yellow path.]
• 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 81 and
Figure 83.
— Go to commission unit (Figure 83), expansion valve
set up, and disch sat tmp [ yellow path.]
— Go to view/set unit (Figure 81 and Figure 82),
temperatures, DRT1 [inverter compressor] and DRT 2
[xed speed compressor] [ green path]
• 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 Figure 81 and Figure
83, go to commission unit, expansion valve set up,
and SS Hi Base [ yellow path.]
— 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 Figure 81 and Figure
83. Go to commission unit, expansion valve set up,
and SS Hi Base [ yellow path.]
— Contact the factory to diagnose why the unit is
hunting.
Air Balancing
The following should be performed by a qualied 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 airow will never be less than that
required for operation of the electric heaters or gas
furnace.
3. When the nal 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 airow/rpm settings can be adjusted
using the MicroTech III controller. Refer to OM 1141 for details.
WARNING
Moving machinery hazard. Can cause severe
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.