Servicing Units Void Of Charge; Start-Up - Lennox ML18XC2 Series Manual

Accessories
For update-to-date information, see any of the following
publications:
• Lennox ML18XC2 Product Specification bulletin
• Lennox Product Catalog
• Lennox Price Book

Servicing Units 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 15.
2 - Evacuate the system using procedure outlined on
page 16.
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 16.
5 - Weigh in refrigerant.

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.
2 - Inspect all factory and field-installed wiring for loose
connections.
3 - After evacuation is complete, open the liquid line
and suction line service valves to release the
refrigerant charge (contained in outdoor unit) into
the system.
4 - Replace the stem caps and tighten as specified in
Operating Service Valves on page 7.
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 Start-Up and Charging
Procedures.
9 - Recheck voltage while the unit is running. Power
must be within range shown on the nameplate.
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