Charging The System - Haier HC18D2VAR Service Manual

8.Pressurize the lines to 150 psi maximum with dry nitrogen. Check for leaks at all joints with liquid
detergent. If a leak is found, repair it after removing the nitrogen. Repeat the process and re-check.
9.Do not purge the lines with refrigerant.
Evacuation
All refrigerant systems must be evacuated to a deep vacuum to remove all noncondensible gases and
moisture prior to charging the system. Air in a system increases condensing pressure, which increases
power consumption and reduces performance. The presence of moisture in a system leads to premature
failure. Proper evacuation assures a dry, uncontaminated system.
Recommended Evacuation Procedure:
1.Connect vacuum pump to both liquid and suction valve service ports.
2.Evacuate the interconnecting tubing and indoor coil to a level of 500 microns or less or for a minimum of 30
minutes. Close the valve to the vacuum pump and wait 15 minutes. The vacuum should not rise above 800
microns. If unable to obtain 500 microns, or vacuum rises above 800 microns after a 15 minutes period,
discontinue evacuation, pressurize and check for leaks. Repair any leaks found and repeat the step 2.
3.Close valve to the vacuum pump and stop pump.
4.When sure of a tight, well evacuated system, charge with refrigerant.

8.7 Charging the System

(For systems with capillary tube or fixed orifice metering device)
Before checking the system charge, make sure that the outdoor unit and indoor coil are an approved
match system. For best result, the indoor conditions should be within 2 F of the desired comfort conditions.
! WARNING -
Do not vent refrigerant to the atmosphere! It is a violation of federal law to do so. If
the refrigerant needs to be removed from a system to correct the system charge, always use a recovery
or recycling device.
! WARNING -
Service refrigerant carefully, high pressure are present.
.
1.Fully open both shutoff valves.
2.Connect service gage manifold to the valve service ports, being sure to evacuate lines.
3.Startup the system. Run system at least 10 minutes to allow pressure to stabilize.
4.Temporarily install a thermometer on the vapor line near outdoor unit. Be sure of good contact
between thermometer and line. Wrap thermometer with insulating material to assure accurate reading.
5.Refer to Table 8-2 for proper system superheat. Add charge to lower superheat. Remove charge to
raise superheat. Carefully remove guage.
18
Central Air Conditioning
Model: Condensing Unit, HC13-D2