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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 pro-
vides a record of unit condition, application require-
ments, system information, and operation at initial
start-up.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Do not attempt to start the heat pump system, even mo-
mentarily, until the following steps have been completed.
Compressor damage may result.
System Check
1. Check all indoor section and other equipment auxil-
iary components. Consult the manufacturer's instruc-
tions 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 "Prelimi-
nary Charge", below.
6. The electrical power source must agree with the
unit's nameplate rating.
7. The crankcase heater must be firmly attached to the
compressor 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 ener-
gize the crankcase heater, proceed as follows:
1. Set the space thermostat set point above the space
temperature 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 op-
erating charge listed in the Physical Data table (Tables 2
and 3 on pages 6 and 7). Allow high and low side pressures
to equalize before starting compressor. If pressures do not
equalize readily, charge vapor on low side of system to as-
sure charge in the evaporator. Refer to GTAC II, Module 5,
Charging, Recover, Recycling, and Reclamation for liquid
charging procedures.
CHS-180-240-01SI Rev. A
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Prior to starting compressor, a preliminary charge of
refrigerant must be added to avoid possible compressor
damage.
CHS Units
The compressor crankcase heater must be on for 24 hours
before start-up. After the heater has been on for 24 hours,
the unit can be started. If no time elapsed since the prelimi-
nary charge step was completed, it is unnecessary to wait
the 24-hour period.
PRELIMINARY CHECKS
1. Check that electric power supply agrees with unit
2. Verify that the compressor crankcase heater is
3. Check that the compressor crankcase heater has
4. Recheck for leaks using the procedure outlined in the
5. Ensure that the preliminary charge has been added
6. All internal wiring connections must be tight, and all
NOTE: The units are factory charged with the required
amount of oil. If recharging in required, use Emkarate
RL 32-3MAF.
COMPRESSOR ROTATION
On 3-phase units with scroll compressors, it is important to
be certain that the compressor is rotating in the proper di-
rection. CHS units are equipped with a Comfort Alert Diag-
nostic Module (CADM). Alert Code 7 indicates reverse pow-
er 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
To verify the compressor is rotating in the proper direction:
1. Connect service gauges to the suction and liquid
2. Energize the compressor.
3. The suction pressure should drop and the liquid pres-
COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when
either the current or internal motor winding temperature
becomes excessive, and automatically resets when the
internal temperature drops to a safe level. This overload
may require up to 60 minutes (or longer) to reset. If the inter-
nal overload is suspected of being open, disconnect the
1. Third-party trademarks and logos are the property of their respective
owners.
Specifications subject to change without notice.
CAUTION
START-UP
nameplate data.
securely in place.
been on at least 24 hours.
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.
as described in the Pre-Start-Up section, Preliminary
Charge.
barriers and covers must be in place.
pressures.
pressure fittings.
sure should rise, as is normal on any start-up.
®1
17
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