Air Flow Adjustments - Daikin DCC Series Installation Instructions Manual

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ilter eCtiOn HeCk
Remove filter section access panels and check that filters
are properly installed. Note airflow arrows on filter frames.
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re startuP reCautiOns
It is important to your safety that the unit has been properly
grounded during installation. Check ground lug connection in
main control box for tightness prior to closing circuit breaker
or disconnect switch. Verify that supply voltage on line side
of disconnect agrees with voltage on unit identification plate
and is within the utilization voltage range as indicated in
Appendix B Electrical Data.
System Voltage - That nominal voltage value assigned to
a circuit or system for the purpose of designating its voltage
class.
Nameplate Voltage - That voltage assigned to a piece of
equipment for the purpose of designating its voltage class
and for the purpose of defining the minimum and maximum
voltage at which the equipment will operate.
Utilization Voltage - The voltage of the line terminals of the
equipment at which the equipment must give fully satisfactory
performance. Once it is established that supply voltage will
be maintained within the utilization range under all system
conditions, check and calculate if an unbalanced condition
exists between phases. Calculate percent voltage unbalance
as follows:
Three Phase Models Only
3) PERCENT VOLTAGE
= 100 X
UNBALANCE
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
Percent voltage unbalance MUST NOT exceed 2%
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OntrOl Oltage HeCk
Close the disconnect switch to energize control transformer.
Check primary and secondary (24V) of control transformer .

AIR FLOW ADJUSTMENTS

NOTE: For 2 speed models, (models with a V or W in the 11th
position of the model number), airflow adjustments must be
made on high speed, i.e., 2nd stage cooling or in heat mode.
Refer to the following "Drive Adjustments" section.
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.
2) MAXIMUM VOLTAGE DEVIATIONS
FROM AVERAGE VOLTAGE
1) AVERAGE VOLTAGE
4 400
= = 1.8%
216
216
.
If an economizer is installed, check the unit operating bal-
ance with the economizer at full outside air and at minimum
outside air.
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vaPOratOr an OtatiOn
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nly
Check that fan rotates counter-clockwise when viewed from
the drive side of unit and in accordance with rotation arrow
shown on blower housing. If it does not, reverse the two
incoming power cables. In this case, repeat bearing check.
Do not attempt to change load side wiring. Internal wiring
assures all motors and compressors will rotate in correct
direction once evaporator fan motor rotation check has been
made.
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leCtriCal nPut HeCk
Make preliminary check of evaporator fan ampere draw and
verify that motor nameplate amps are not exceeded. A final
check of amp draw should be made upon completion of air
balancing of the duct system (see Appendix B).
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et vaPOratOr an
Actual RPM's must be set and verified with a tachometer or
strobe light. Refer to Appendices A and B for basic unit fan
RPM. Refer also to "Airflow" section of this manual. With
disconnect switch open, disconnect thermostat wires from
terminals Y and W. This will prevent heating and mechanical
cooling from coming on. Place a jumper wire across termi-
nals R and G at TB1 terminal block. Close disconnect switch;
evaporator fan motor will operate so RPM can be checked.
NOTE: While in the Cooling Mode, to prevent frost from
forming on the evaporator while the unit is operating in outdoor
temperatures of 65°F or lower, it is recommended that a low
ambient kit (LAKT-**) is used. This is strongly recommended
for 2 Speed models due to the lower airflow while in the
first stage cooling. To further protect the compressor from
damage during low ambient conditions, a Freezestat Kit
(FSK01) can be added that turns the compressor off when
the evaporator temperature drops too low.
BELt DriVE MoDELs onLY
The drive on the supply fan is typically set in the middle of the
RPM range. The drive motor sheave pitch diameter is field
adjustable for the required airflow. Refer to "Motor Sheave
Adjustmens" section.
Upon completion of the air flow balancing, we recommend
replacing the variable pitched motor sheave with a proper-
ly-sized fixed sheave. A matching fixed sheave will provide
longer belt and bearing life and vibration free operation.
Initially, it is best to have a variable pitched motor sheave
for the purpose of airflow balancing, but once the balance
has been achieved, fixed sheaves maintain alignment and
minimize vibration more effectively. For direct drive units,
move fan speed wire.
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