Air innovations 99H0360-10, Инструкция по установке, эксплуатации и обслуживанию, Страница: 46 / 85

46
Leak Checking and Evacuation Process
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Pressurize and leak test the interconnecting lines, including the fan coil unit, fittings, and
brazed joints using the intended operating refrigerant, nitrogen, or dry air for leak testing.
A pressure equal to the low side test pressure marked on the unit nameplate is
recommended for leak testing. Repair any leaks found. Connect a good vacuum pump to
both the low and high side service valves while still in their factory supplied position,
isolating the refrigerant charge in the condensing unit. Draw a deep vacuum of at least
15pp microns. Do not use the motor compressor to pull a vacuum and do not operate the
motor compressor in a vacuum.
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Evacuate the system to hold at 500 microns and break the vacuum by releasing the factory
refrigerant charge in the condensing unit to interconnect lines and fan coil unit by opening
service valves. Remove the vacuum pump. The system is now ready for optimal charging.
Refer to pages 50-51 of this manual for correct refrigerant charging based on your
interconnect length. Charge the system with the correct amount of refrigerant and mark
the amount, with a ballpoint pen, in the space provided on the unit nameplate.
NOTE: When charging through the suction service valve the refrigerant should be
charged in vapor form. NEVER CHARGE IN LIQUID FORM. Refrigerant should always be
charged through a dryer. Charging in liquid form may damage the valve plate assembly
as well as scrub the oil out of the compressor bearings.
WARNING
NON-AZEOTROPES MUST BE CHARGED IN THE LIQUID PHASE ONLY. TO AVOID COMPRESSOR
DAMAGE, LIQUID MUST ALWAYS BE CHARGED INTO THE HIGH SIDE OR INTO AN
ACCUMULATOR.
NOTE: Be sure there is not an overcharge of refrigerant. An overcharge might permit
liquid refrigerant to enter the motor compressor and damage the valves, rods, pistons,
etc
.
Wiring
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Wire the system as per the supplied wiring schematics starting on page 19 of this
manual.
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The DS fan coil unit is powered through a factory-supplied power cord (for DS
models, WGS is hard connected) but you will need to run 24-volt power wires from
the low voltage terminal block on the fan coil to the terminal block in the junction
box in the condensing unit labeled Y & C. This can be typical controller wire or 18-
gauge insulated wire. (see Fig.2 & 3 on the following page)