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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:
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.
If an economizer is installed, check the unit operating
balance with the economizer at full outside air and at
minimum outside air.
High stage airflow setting to be between 300 and 500
CFM per ton, see Table below. For models with electric
heat the total airflow must not be less than that required
for operation of the electric heaters. See Appendix D for
minimum airflow for specific electric heaters.
NOTE: Never run CFM below 300 CFM per ton,
evaporator freezing or poor unit performance is
possible.
Model
Minimum
DP16HM60
1500
High Stage Airflow Setting, CFM
(without electric heat)
EEM - Standard Static Drive Motor
Adjust the CFM for the unit 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
NOTE: If more than one lead is energized
simultaneously, the motor will run at the higher
speed.
Fan speed for G (Fan), Y1 (Low Cool) and W1 (Low Heat)
are fixed setting on TB1/T1 and cannot be moved.
Purple wire Y2 (High Cool) and Brown wire W2 (High Heat)
are connected to TB1/T2. These wires can be moved
together or separately and placed on any unoccupied
terminal T3-T5.
Note: for proper operation Y2 and W2 should have a higher
speed setting than the G, Y1 and W1 speed setting.
Nominal
Maximum
1850
2500
If Electric Heater kit is installed use the red wire provided
with the literature kit to jumper terminal TB1/W1 to an
unoccupied speed tap that satisfies the minimum airflow
required for the heater kit. This must be a different tap
than Y2 is connected to. Refer to Appendix D for minimum
required airflow for electric heaters.
Note: On Heat Pump units, the Yellow (YL) wire
from relay BR1 to TB1/T2 must always be moved
to the same terminal location as the Brown (BR)
wire after adjustments are made, to ensure
proper blower speed during defrost operation.
Refrigeration System Checks
This unit is equipped with thermal expansion valves.
Ensure the hold-down bolts on the compressor are secure
and have not vibrated loose during shipment. Check
that the vibration grommets have been installed and
visually check all piping for damage and leaks and repair
if necessary. The entire system has been factory charged
and tested, making it unnecessary to field charge. Factory
refrigerant charge is shown on the unit's nameplate.
To confirm charge levels or, if a leak occurs and charge
needs to be added to the system, it is recommended to
evacuate the system and recharge refrigerant to the unit's
nameplate specifications. This unit has been rated in the
cooling mode at the AHRI rated conditions of: indoor (80°F
db/67°F wb) and outdoor (95°F db). While operating at this
condition, the superheat should range from 9°F to 11°F for
each refrigeration circuit measured at the suction service
port located near the compressor.
Start-Up Procedure and Checklist
Begin with power turned off at all disconnects.
Air Conditioning Start-Up Procedure
1. Ensure the thermostat is set to OFF and Fan is set
to Auto.
2. Inspect all registers and set them to the normal open
position.
3. Turn on the electrical supply at the disconnect.
4. Turn the fan switch to the "ON" position. The blower
should operate after a 7 second delay.
5. Turn the fan switch to "Auto" position. The blower
should stop after a 60 second delay.
6. Set the thermostat to Cool mode and slowly
lower the cooling temperature until the unit starts.
The compressor, blower and fan should now be
operating. Allow the unit to run 10 minutes, make
sure cool air is being supplied by the unit.
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