Daikin DFC Series, Installation Instructions Manual

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11
Three Phase Models
3) PERCENT VOLTAGE
UNBALANCE
2) MAXIMUM VOLTAGE DEVIATIONS
FROM AVERAGE VOLTAGE
1) AVERAGE VOLTAGE
HOW TO USE THE FORMULA:
EXAMPLE: With voltage of 220, 216, and 213
1) Average Voltage = 220+216+213=649 / 3 = 216
2) Maximum Voltage Deviations from Average Voltage = 220 - 216 = 4
3) Percent Voltage Unbalance = 100 x = = 1.8%
Percent voltage unbalance MUST NOT exceed 2%
.
4
216
400
216
= 100 X
AIR FLOW ADJUSTMENTS
When the final adjustments are complete, the current draw of the
motor should be checked and compared to the full load current
rating of the motor. The amperage must not exceed the service
factor stamped on the motor nameplate. The total airflow must
not be less than that required for operation of the electric heaters
or the furnace.
If an economizer is installed, check the unit operating balance with
the economizer at full outside air and at minimum outside air.
NOTE: High Stage Airflow setting below 300 CFM/Ton is not rec -
ommended, as evaporator freezing or poor unit performance is
possible.
• The unit has one set of taps for cooling (T1-T5) and a
second set of taps for heating (T6-T10).
• When Heat is called TB1-W1 will also call TB1-DH
activating the second set of taps T6-T10.
• If cooling and heating is called at the same time heating
will take priority and T6-T10 will be chosen by default.
• Taps T1 and T2 are for low cool operation (cooling stage
1) and Taps T3 to T5 are for high cool operation (cooling
stage 2).
• Taps T6 and T7 are for low heat operation (heating stage
1) and taps T8 to T10 are for high heat operation (heating
stage 2).
Taps are selected by changing the position of the low voltage
leads on the terminal block TB1. Refer to Appendix A for blower
performance at each speed tap.
Fan speed for G (GR) is fixed at TB1-T1 and cannot be moved.
Low Cool Y1, Yellow (YL) is movable and set to TB1-T1.
Low Heat W1, White (WH) is movable and set to TB1-T6.
High Cool Y2, Purple (PU) is movable and set to TB1-T3.
High Heat W2, Brown (BR) is movable and set to TB1-T8.
These wires can be moved together or separately and placed on
any unoccupied terminal.
Note: YL can be moved to tap T3 as long as YL does not share the
tap with PU. WH can be moved to tap T7 as long as WH does not
share the tap with BR.
If high cool operation is set at Tap T4 or T5, low cool operation
must be set at T2.
If high heat operation is set at T9 or T10, low heat operation
must be set at T7.
Note: On units with DDC controls installed, air flow adjustments
are made through settings in the DDC controller and speed tap
adjustments are not required. Refer to the DDC User Manual for
details on making airflow adjustments. Individual settings are
available for Fan Only, Low Stage Cooling, High Stage Cooling,
Low Stage Heating, and High Stage Heating which can be adjust -
ed as needed to meet airflow requirements.