6
START-UP
IMPORTANT: Do not attempt to start unit, even momentarily,
until all items on the Start --Up Checklist (see page 143) and the
following steps have been read/completed.
Unit Preparation
Check that unit has been installed in accordance with these
installation instructions and all applicable codes.
Refrigerant Service Ports
The refrigerant system has a total of 3 Schrader-type service gauge
ports per circuit. One port is located on the suction line, one on the
compressor discharge line, and one on the liquid line. Be sure that
caps on the ports are tight.
Cr ankc ase Heat er
The compr essor is equipped wi t h a c r ankca se hea t er. The re is a cont r ol
function used to tur n the crankcase hea ters on and of f when the
com pressor is not running. This is a configurable val ue for whic h the
factory default value is set to 65_F. If the ambient is above the selected
value the cont rol will prevent the cr ankca se hea t er fr om tur ning on.
IMPORTANT: Unit power must be on for 24 hours prior to
start--up to allow the crankcase heater to run. Otherwise, damage to
the compressor may result.
Compressor Rotation
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
Improper wiring will cause compressor stoppage and alarm.
Correct wiring by switching leads as indicated below.
CAUTION
!
On 3-pha se units, i t is important to be certain the c ompressors are
rotati ng in the proper dir ection. To det ermi ne whet her or not
com pressors are rotating in the proper direction, use a phase-rotation
me t er on the unit input power to c heck f or L1-L2- L3 or c lockwise
rotati on or use the Service Te st mode to ene rgize a compr essor. If the
com pressor is rotating in the wrong di rection, the c ontrols will stop the
com pr essor and displ ay alarm for “Circuit A Reve r se Rotation” .
NOTE: Indoor or outdoor fan rotation direction may not indicate
proper input power phase sequence, as some 3-phase units use
single-phase fan motors.
To correct the wrong compressor rotation direction, perform the
following procedure:
1. Turn off power to the unit and lock out the power.
2. Switch any two of the incoming unit power leads.
3. Turn on power to the unit.
4. Verify corrected compressor rotation.
Power Supply
All 208/230-v units are factory wired for 230-v power supply. If
the 208/230-v unit is to be connected to a 208-v power supply, the
transformers must be rewired by moving the wire from the
230-volt connection and moving to the 200-volt terminal on the
primary side of the transformer. Refer to unit label diagram for
additional information.
Internal Wiring
Check all electrical connections in unit control boxes; tighten as
required.
Evaporator Fan
The Evaporator fan does not need to be checked for rotatio n as it
only operates in one direction. Refer to the unit product data for
full Fan Performance tables and physical data. The specific unit’s
fan performance table is printed and adhered to the control box
high voltage cover. See Fig. 5 for an example fan performance
table.
Use the job specifications and unit fan performance table to determine
the operating mode specific fan speeds. The following instructions are
included in the unit installation ins tructions. When adjusting the
Heating Fan Speed and High Cooling Fan Speed, ensure that the
CFM is not lowe r than the minimum CFM a l lowed in the produc t
data.
1. Check the job specifications for the CFM (cubic feet per
minute) and ESP (external static pressure) required.
2. Using the chart on the Fan Speed Set Up labels (see Fig. 5),
calculate the RPM from the CFM and ESP for the base unit
plus any field accessories (as listed on the label).
NOTE: The Fan Speed Set Up labels are located on the High
Voltage cover in the Control Box.
3. Press any key on the SystemVu interface to activate the
display backlight and then press the MENU key.
4. Using the UP and DOWN arrow k eys highlight SETTINGS
and then press ENTER.
5. Use the DOWN arrow key highlight the UNIT
CONFIGURATIONS menu then press ENTER.
6. Highlight UNIT CONFIGURATIONS then p ress ENTER.
7. Highlight INDOOR FAN and then press ENTER.
8. Refer to the job specifications to set the following,
determining the values per the RPM Calculator label
(Figure 5). Use the UP and DOWN arrow keys and the
BACK key to set the values. Press ENTER after setting
each value to continue to the next selection.
S IDF VENT SPD
S IDF HEAT SPD
S IDF LOW COOL SPD
S IDF HIGH SPD
S IDF FREE COOL SPD
Service test mode can also be used to temporarily operate the
Evaporator Fan with a percentage (0--100%) command. The fan
test menu will show the converted RPM from the percentage being
commanded. Refer to the Service test section for more details.
Adjust the IDF Maximum Fan Speed (IDF MAX SPEED) to
restrict higher fan speeds as needed for sensitive applications.
IMPORTANT: The IDF M aximum Fa n Spee d ( I D F MAX
SPEED) RPM must not produc e a suppl y CFM tha t is lowe r tha n
the mini m um CFM al lowed in the product data for hea ting and
cooling. The IDF Maximum Fan Spee d (I D F MAX SPEED) must
also be greater than or equal to the highest operating mode speed
setting.
Condenser Fans and Motors
Condenser fans and motors are factory set.
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