Allied Air 4SCU14LE SERIES Руководство по установке и обслуживанию - Страница 8
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Печатать страницуWhen the low side system pressures reach 0 psig, close
the suction line valve. Disconnect all power to the existing
outdoor unit. Refer to the gauges after shutdown to confirm
that the valves are not allowing refrigerant to flow back
into the low side of the system. Disconnect the liquid and
suction lines from the existing outdoor unit.
2. Remove the existing outdoor unit. Set the new R410A
unit and follow the brazing connection procedure outlined
previously on this page to make line set connections.
Do not install the R410A thermal expansion valve at
this time.
3. Make low voltage and line voltage connections to the new
outdoor unit. Do not turn on power to the unit or open
the outdoor unit service valves at this time.
4. Remove the existing R-22 refrigerant flow control orifice
or thermal expansion valve before continuing with
flushing procedures. R-22 flow control devices are not
approved for use with R410A refrigerant and may
prevent proper flushing. Use a field-provided fitting to
reconnect the lines.
5. Remove the pressure tap valve cores from the
4SCU14LE unit's service valves. Connect an R-22
cylinder with clean refrigerant to the suction service
valve. Connect the R-22 gauge set to the liquid line valve
and connect a recovery machine with an empty recovery
tank to the gauge set.
6. Set the recovery machine for liquid recovery and start
the recovery machine. Open the gauge set valves to
allow the recovery machine to pull a vacuum on the
existing system line set and indoor coil.
7. Invert the cylinder of clean R-22 and open its valve to
allow liquid refrigerant to flow into the system through
the suction line valve. Allow the refrigerant to pass from
the cylinder and through the line set and the indoor coil
before it enters the recovery machine.
8. After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so that
all of the R-22 vapor is recovered. Allow the recovery
machine to pull a vacuum on the system.
NOTE: A single system flush should remove all of the
mineral oil from the existing refrigerant lines and indoor
coil. A second flushing may be done (using clean
refrigerant) if insufficient amounts of mineral oil were
removed during the first flush. After each system flush,
allow the recovery machine to pull a vacuum on the
system at the end of the procedure.
9. Close the valve on the inverted R22 cylinder and the
gauge set valves. Pump the remaining refrigerant out
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of the recovery machine and turn the machine off.
10. Use nitrogen to break the vacuum on the refrigerant
lines and indoor coil before removing the recovery
machine, gauges, and R22 refrigerant drum. Re-install
pressure tap valve cores into the 4SCU14LE unit's
service valves.
11. Install a thermal expansion valve kit (sold separately)
that is approved for use with R410A refrigerant in the
liquid line at the indoor coil.
Refrigerant Metering Device
4SCU14LE units are designed for use with TXV systems only.
Expansion valves equipped with Chatleff-type fittings are
available from the manufacturer. See Table 3 for proper TXV
for each unit.
4SHP14LE-18.-24, -30
4SHP14LE-36, -41,
-42, -47, -48
4SHP14LE-48, -60
To install an expansion valve (see Figure 9):
1. Separate the distributor assembly and remove the piston
orifice and used teflon seal. Insert nozzle end of the
expansion valve along with a new teflon seal into the
distributor and tighten to 20 – 30 ft. lbs. Use backup wrench
on all wrench flats. Overtightening will crush the teflon
seal and may cause a leak.
2. Attach liquid line portion of distributor assembly along
with new teflon seal to the inlet of the expansion valve.
Tighten to 20 – 30 ft. lbs. Use backup wrench on all
wrench flats. Overtightening will crush the teflon seal
and may cause a leak.
3. Connect the external equalizer line to the equalizer port
on the suction line and tighten to 8 ft. lbs.
4. Strap the superheat sensing bulb to the suction header.
If installing an expansion valve on an indoor coil that
previously used a fixed orifice, be sure to remove the existing
fixed orifice. Failure to remove a fixed orifice when installing
an expansion valve to the indoor coil will result in improper
operation and damage to the system.
Issue 1015
TXV Data
Model
Number
H4TXV01
H4TXV02
H4TXV03
Table 3
Part
506251-01