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506 01 2303 01
Specifications are subject to change without notice.
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.
CAUTION
!
System Check
1. Check all indoor section and other equipment
auxiliary components. 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
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
energize 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 operating charge listed in the Physical Data table
(Tables 1A and 1B on pages 5 and 6). 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 assure charge in the evaporator. Refer to
GTAC II, Module 5, Charging, Recover, Recycling, and
Reclamation for liquid charging procedures.
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.
CAUTION
!
START-UP
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
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
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
direction. CHS 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 gages 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.
