Servicing Units Void Of Charge; Unit Start-Up; System Refrigerant - Lennox EL16XC1 Series Installation And Service Procedure

Servicing Units Void of Charge

If the outdoor unit is void of refrigerant, clean the entire
system using the procedure described below.
1. Leak check system set using procedure outlined on
page 19.
2. Evacuate the system set using procedure outlined on
page 20.
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 20.
5. Weigh in refrigerant using procedure outlined in figure
17.
6. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level. If system dryness is not
verified, the compressor will fail in the future.

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.
GAUGE SET
CONNECTIONS FOR TESTING AND CHARGING
AClose manifold gauge set valves and connect the center hose to a cylinder of HFC-410A. Set for liquid phase charging.
BConnect the manifold gauge set's low pressure side to the suction line service port.
CConnect the manifold gauge set's high pressure side to the liquid line service port.
DPosition temperature sensor on liquid line near liquid line service port.
SUCTION LINE
B
SERVICE PORT
CONNECTION
CHARGE IN
LIQUID PHASE
D
TEMPERATURE
SENSOR
Figure 14. Gauge Set Setup and Connections
1. Rotate fan to check for binding.
2. Inspect all factory- and field-installed wiring for loose
connections.
3. After evacuation is complete, open both the liquid and
vapor line service valves to release the refrigerant
charge contained in outdoor unit into the system.
4. Replace the stem caps and tighten to the value listed
in table 1.
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 nameplate.
8. Check system for sufficient refrigerant by using the
procedures listed under System Charge.

System Refrigerant

This section outlines procedures for:
1. Connecting gauge set for testing and charging;
2. Checking and adjusting indoor airflow;
3. Adding or removing refrigerant.
MANIFOLD GAUGE SET
LOW
REFRIGERANT TANK
A
DIGITAL SCALE
C
TO LIQUID
LINE SERVICE
VALVE
Page 27
HIGH
OUTDOOR UNIT
SERVICE VALVE
TEMPERATURE SENSOR
(LIQUID LINE)
VAPOR LINE
LIQUID LINE
SERVICE VALVE
EL16XC1 SERIES