Daikin MPS015 F Installation And Maintenance Manual page 93

Power-Up
1 . Close the unit disconnect switch.
2 . Power should now be supplied to the control panel.
Fan Start-Up
1 . Remove shipping bolt from fan spring if this has not
already been done.
2 . Verify fan spring adjustment and that the fan assembly is
level. Adjust as necessary.
3 . Verify all duct isolation dampers are open.
4 . Place the unit into the "Fan Only" mode through the
keypad.
5 . The controller should enter the "Startup Initial" operating
state. If the fan does not run, check the manual motor
protectors or that the circuit breakers have not tripped.
6 . Verify the rotation is correct.
Economizer Start-Up
1 . Check whether the outdoor air is suitable for free cooling.
2 . At the keypad, set the cooling setpoint low enough so the
controller calls for cooling.
3 . Place the unit into cooling mode through the keypad menu.
4 . Observe the outdoor air dampers:
a . If the outdoor enthalpy is low, the control algorithm
should start to modulate the dampers open to
maintain the discharge air setpoint.
b . If the outdoor enthalpy is high, the dampers should
maintain their minimum position.
NOTE: It may not be possible to check the economizer
operation in both low and high enthalpy states on the
same day. If this is the case, repeat this procedure on
another day when the opposite outdoor air enthalpy
conditions exist.
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Compressor Start-Up
Low ambient temperature hazard . Can cause compressor
damage . Do not attempt to start up and check out the
refrigeration system when the outdoor air temperature is
below 20°F.
With the supply fan operational, prepare for compressor
operation .
1 . Inspect all refrigerant piping and look for leaks by looking
for refrigerant oil residue. If any problem is found, reclaim
any remaining refrigerant, fix the problem and then
add the circuit's nameplate charge by weight before
proceeding.
2 . Connect service gauges and verify that the unit has not
lost its refrigerant charge.
3 . Verify that the crankcase heaters are operating. These
should operate for at least 24 hours before starting the
compressors.
4 . Verify that the condenser fan blades are positioned
properly (see Figure
The fan blade must be correctly positioned within its
orifice for proper airflow across the condenser coils.
5 . Check the fan rotation.
Figure 79: Condenser Fan Blade Positioning
1.21"
93 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
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CAUTION
79) and that the screws are tight.
Fan Blade
roCedUres
Orifice