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Step 8 — Wind Baffles for Low Ambient Control
575J***H and 575J***N units includes the factory installed
low ambient controller.
Units with low ambient control require the addition of wind
baffles to ensure full range low ambient operation. Material
data and dimensions for wind baffles are included in the Ap-
pendix C section, Low Ambient Control, starting on page 45.
Fabricate the wind baffles and mount per instructions.
PRE-START-UP
IMPORTANT: Before beginning Pre-Start-Up or Start-Up,
review Start-Up Checklist at the back of this book. The
Checklist assures proper start-up of a unit and provides a
record of unit condition, application requirements, system
information, and operation at initial start-up.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Do not attempt to start the heat pump system, even
momentarily, until the following steps have been
completed. Compressor damage may result.
System Check
1.
Check all indoor section and other equipment auxiliary com-
ponents. Consult the manufacturer's instructions regarding
any other equipment connected to the condensing unit. If the
unit has field-installed accessories, be sure all are properly
installed and correctly wired. If used, the airflow switch must
be properly installed.
2.
Be sure the unit is properly leak checked and dehydrated.
3.
Check tightness of all electrical connections.
4.
Open the liquid line and suction line service valves.
5.
Be sure the unit is properly charged. See "Preliminary
Charge", below.
6.
The electrical power source must agree with the unit's name-
plate rating.
7.
The crankcase heater must be firmly attached to the compres-
sor crankcase. Be sure the crankcase is warm (heater must be
on for 24 hours before starting compressor).
Turn On Crankcase Heater
Turn on the crankcase heater for 24 hours before starting the
unit to be sure all the refrigerant is out of the oil. To energize
the crankcase heater, proceed as follows:
1.
Set the space thermostat set point above the space tempera-
ture so there is no demand for cooling.
2.
Close the field disconnect.
Preliminary Charge
Before starting the unit, charge liquid refrigerant into the high
side of the system through the liquid service valve. The amount
of refrigerant added must be at least 80% of the operating
charge listed in the Physical Data table (Tables 3 and 4 on page
5). Allow high and low side pressures to equalize before start-
ing compressor. If pressures do not equalize readily, charge va-
por on low side of system to assure charge in the evaporator.
Refer to GTAC II, Module 5, Charging, Recover, Recycling,
and Reclamation for liquid charging procedures.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment dam-
age.
Prior to starting compressor, a preliminary charge of refrig-
erant must be added to avoid possible compressor damage.
575J Units
The compressor crankcase heater must be on for 24 hours be-
fore start-up. After the heater has been on for 24 hours, the unit
can be started. If no time elapsed since the preliminary charge
step was completed, it is unnecessary to wait the 24-hour
period.
PRELIMINARY CHECKS
1.
Check that electric power supply agrees with unit nameplate
data.
2.
Verify that the compressor crankcase heater is securely in
place.
3.
Check that the compressor crankcase heater has been on at
least 24 hours.
4.
Recheck for leaks using the procedure outlined in the
Pre-Start-Up section, Leak Test and Dehydration. If any leaks
are detected, repair as required. Evacuate and dehydrate as
described in the Leak Test and Dehydration section.
5.
Ensure that the preliminary charge has been added as
described in the Pre-Start-Up section, Preliminary Charge.
6.
All internal wiring connections must be tight, and all barriers
and covers must be in place.
NOTE: The units are factory charged with the required amount
of oil. If recharging in required, use Emkarate
COMPRESSOR ROTATION
On 3-phase units with scroll compressors, it is important to be
certain that the compressor is rotating in the proper direction.
The 575J units are equipped with a Comfort Alert Diagnostic
Module (CADM). Alert Code 7 indicates reverse power phasing.
To correct phase order:
1.
Turn off power to the unit, tag disconnect.
2.
Reverse any two of the unit power leads.
3.
Reapply power to the compressor, verify correct pressures.
To verify the compressor is rotating in the proper direction:
1.
Connect service gauges to the suction and liquid pressure
fittings.
2.
Energize the compressor.
3.
The suction pressure should drop and the liquid pressure
should rise, as is normal on any start-up.
COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when either
the current or internal motor winding temperature becomes ex-
cessive, and automatically resets when the internal temperature
drops to a safe level. This overload may require up to 60 min-
utes (or longer) to reset. If the internal overload is suspected of
being open, disconnect the electrical power to the unit and
check the circuit through the overload with an ohmmeter or
continuity tester.
1. Third-party trademarks and logos are the property of their respective
owners.
17
CAUTION
START-UP
®1
RL 32-3MAF.
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