Air Flow Adjustments - Daikin DCC Series Installation Instructions Manual

Utilization Voltage - The voltage of the line terminals of the equip-
ment at which the equipment must give fully satisfactory perfor-
mance. 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. Calcu-
late 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%
C V C
ONTROL OLTAGE HECK
With disconnect switch in the open "OFF" position, disconnect blue
wire from low voltage transformer TRANS1. Close the disconnect
switch to energize TRANS1 control transformer. Check primary and
secondary (24V) of control transformer TRANS1.

AIR FLOW ADJUSTMENTS

NOTE: For 2 Speed Models, airflow adjustments must be made on
high speed, i.e., 2nd stage cooling or in heat mode.
The drive on the supply fan is typically set in the middle of the
RPM range. The drive motor sheave pitch diameter is field adjust-
able for the required airflow. 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.
If an economizer is installed, check the unit operating balance with
the economizer at full outside air and at minimum outside air. Upon
completion of the air flow balancing, we recommend replacing the
variable pitched motor sheave with a properly-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 align-
ment and minimize vibration more effectively. For direct drive units,
move green wire for fan.
NOTE: On "non-two speed models" (two-speed models have a "V"
in the eleventh character of the model number), never run CFM
below 300 CFM per ton. Evaporator freezing or poor unit perfor-
mance is possible.
2) MAXIMUM VOLTAGE DEVIATIONS
FROM AVERAGE VOLTAGE
1) AVERAGE VOLTAGE
4 400
= = 1.8%
216 216
.
E F R
VAPORATOR AN OTATION
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.
E I C
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).
S E F RPM
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 terminals R and G at TB1 terminal block. Close
disconnect switch; evaporator fan motor will operate so RPM can
be checked.
S - P C
TART UP ROCEDURE AND
Models with a V in the 11th position of the model number.
For 2 speed models, the indoor blower will operate on low speed
when in "Fan Only" mode or while in first stage "Cooling" mode.
Unit will operate on high speed in "Heating" mode and while in
second stage "Cooling" mode.
The start-up procedure is the same as for "Air Conditioning Start-
up Procedure" with the understanding that in Step 6, the indoor
blower will run at low speed (~1175 motor rpm) and in Step 7, the
indoor blower will operate at high speed (~1775 motor rpm).
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 adjust-
able for the required airflow. Refer to "Motor Sheave Adjustmens"
section.
11
C (T P M
HECK HREE HASE ODELS
2 S M :
HECKLIST FOR PEED ODELS
O )
NLY