Start Up - Daikin SWP Series Installation Manual

Start Up

General
All units are factory tested for proper field operation.
1 . Verify that the close disconnect switch with switch S7 is
in the Auto position and that the crankcase heaters have
operated for 24 hours .
2 . Supply power to the MicroTech III controller; the LEDs on
MCB1 should follow the normal startup sequence .
3 . Set the internal MicroTech III time clock or the external
time clock, if used .
4 . Set the cooling set point to a value that provides a full
call for cooling .
5 . Start the auxiliary equipment for the installation such as
water pumps, cooling towers, etc .
Fan Start Up
1 . Place the unit into the FAN ONLY mode, using the
following keypad sequence .
System
– Control Mod:
– Off
– Auto
– Heat/Cool
– Heat only
– Cool only
– Fan only
2 . Turn switch S7 to ON . The supply air fan should start
and run .
3 . Observe the fan rotation . If the fan rotates backward,
reverse the two legs of the main unit supply power . Unit
compressors are factory "phased" to match the supply
fan . Do not reverse internal fan motor power leads since
this results in the compressor being out of phase .
4 . If the fan does not run:
a . Check the control circuit fuses F1A, F1B, F1C .
b . Verify that the fan overload is not tripped .
c . Check the fan motor power fuses or manual motor
protector (MMP) .
d . Trace the circuits .
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Compressor Start Up
With the supply air fan operational, prepare for compressor
operation .
The unit ships with the refrigeration service valves closed .
Remove the service caps and backseat (open) the suction,
discharge, and liquid line valves . Then replace the service
caps .
Connect service gauges and crack valves off the backseat
position (one turn forward) . Verify that the unit has not lost its
refrigerant charge due to shipping damage or leaks . Verify
that the compressor crankcase heaters are operating . These
should operate at least 24 hours before starting compressors .
1 . Set Cooling Control Setpoint, MicroTech III, to a value
that provides a call for full cooling .
2 . Place the unit into the COOL ONLY mode through the
keypad/display .
3 . If desired, the MicroTech internal control timers can
be reduced to 20 seconds . Enter the amount of time
it operates in this "Fast" mode through the keypad as
follows:
Extended Menus
• Timer Settings
– Service Time
NOTE: Use "Fast" timers only to verify the sequencing
of compressors during Start Up . For proper unit
operation, return the timer to "Normal ."
Do not allow compressors to come on repeatedly in the
"Fast" timer mode since this can damage compressors and/or
indicates "Motor Protector Failure" under compressor alarms .
4 . If the compressor motor hums but does not run, verify
that the unit is getting three-phase power .
The compressors should run continuously . If a compressor
cycles on the low pressure switch:
1 . Verify that the circuit is not low on charge .
2 . Check for low airflow.
3 . Check for clogged filters.
4 . Check for restricted ductwork .
5 . Check for very low mixed air temperatures to the unit .
6 . Verify that all the distributor tubes, the expansion
valve and the liquid line components are feeding the
evaporator coil .
7 . Verify that all fan section access panels are in place .
8 . Verify that the suction service valves and the liquid line
service valves are completely open .
9 . Verify that all sensor inputs are connected .
35 IM 1032-2 • Self-Contained Air Conditioning Systems
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