Servicing Unit Delivered Void Of Charge; Unit Start−Up; System Refrigerant - Lennox Merit 14ACX−018−230 Installation Instructions Manual

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 in this
instruction.
2. Evacuate the system using procedure outlined in this
instruction.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again using procedure outlined
in this instruction.
5. Weigh in refrigerant using procedure outlined under
Start−Up and Charging Procedures.
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.
1. Rotate fan to check for binding.
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.
506645−01
SUCTION LINE
B
SERVICE PORT
CONNECTION
REFRIGERANT TANK
CHARGE IN
LIQUID PHASE
DIGITAL SCALE
D TEMPERATURE
SENSOR
Figure 18. Manifold Gauge Set Setup and Connections
2. Inspect all factory− and field−installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
suction line service valve stems (Operating Service
Valves on page 4) 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. Connect manifold gauge set for testing and charging
using figure 18 as a guideline.
7. 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.
8. Recheck voltage while the unit is running. Power must
be within range shown on the unit nameplate.
9. Check system for sufficient refrigerate using the
procedures outlined in under System Refrigerant.

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
HIGH
LOW
A
C
TO LIQUID
LINE SERVICE
VALVE
Page 22
OUTDOOR UNIT
TEMPERATURE SENSOR
(LIQUID LINE)