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Servicing Units Delivered Void of Charge
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1. Leak check system using procedure outlined on page
11.
2. Evacuate the system using procedure outlined on
page 12.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again using procedure outlined
on page 12.
5. Weigh in refrigerant using procedure outlined under
figure 15.
Unit Start-Up
IMPORTANT
If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
1. Check that fan rotates freely.
2. Inspect all factory- and field-installed wiring for loose
connections.
GAUGE SET
CONNECTIONS FOR TESTING AND CHARGING
A
Close manifold gauge set valves and
connect the center hose to a cylinder of
HFC-410A. Set
for
charging.
B
Connect the manifold gauge set's low
pressure side to the suction line service
port.
C
Connect the manifold gauge set's high
pressure side to the liquid line service
port.
D
Position temperature sensor on liquid
line near liquid line service port.
SUCTION LINE
B
SERVICE PORT
CONNECTION
liquid phase
REFRIGERANT TANK
CHARGE IN
LIQUID PHASE
TEMPERATURE
D
SENSOR
Figure 12. Manifold Gauge Set Setup and Connections
3. Open the liquid line and suction line service valve
stems (Operating Service Valves on page 2) to
release the refrigerant charge (contained in outdoor
unit) into the system.
4. Replace the valve stem caps and tighten as specified
in Operating Service Valves on page 2.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted with the power company and the
voltage condition has been corrected.
6. Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit and close the outdoor
unit disconnect switch to start the unit.
7. Recheck voltage while the unit is running. Power must
be within range shown on the unit nameplate.
8. Check system for sufficient refrigerate using the
procedures outlined in under System Refrigerant.
System Refrigerant
This section outlines procedures for:
1. Checking
recommended in figure 14.
2. Determine the best method for adding or removing
refrigerant as outlined in figure 13.
MANIFOLD GAUGE SET
LOW
A
DIGITAL SCALE
C
TO LIQUID
LINE SERVICE
VALVE
Page 15
and
adjusting
indoor
HIGH
OUTDOOR UNIT
TEMPERATURE SENSOR
(LIQUID LINE)
airflow
as
TSA*H4 SERIES
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