OMM 1166-1
AGZ 025D through 190D
77
should be within 5
F to 10
F (2.8
C to 5.6
C)
of the outdoor air temperature. At 25-50%
load, the liquid line temperature should be
within 5
F (2.8
C) of outdoor air temperature
with all fans on. At 75-100% load the liquid
line temperature should be within 10
F (5.6
C)
of outdoor air temperature with all fans on.
It may be necessary to add refrigerant through
the compressor suction. Because the
refrigerant leaving the cylinder must be a
liquid, exercise care to avoid damage to the
compressor by using a flow restrictor. A sight
glass can be connected between the charging
hose and the compressor. It can be adjusted to
have liquid leave the cylinder and vapor enter
the compressor.
Overcharging of refrigerant will raise the
compressor discharge pressure due to filling of
the condenser tubes with excess refrigerant.
Service
With R-410A, fractionalization, if due to leaks
and recharge has a minimal effect on
performance or operation.
Special tools will be required due to higher
refrigerant pressures with R-410A. Oil-less/hp
recovery units, hp recovery cylinders (DOT
approved w/525# relief), gauge manifold 30”-
250 psi low/0-800 psi high, hoses w/800 psi
working & 4,000 psi burst.
All filter driers and replacement components
must be rated POE oils and for the refrigerant
pressure (R-410A 600psig typical).
R-410A compressor internal relief is 600-650
psid.
Brazed connections only. No StayBrite or
solder connections (solder should never be
used with any refrigerant). K or L type
refrigeration tubing only. Use nitrogen purge.
Higher R-410A pressures and smaller molecule
size make workmanship more critical.
R-410A must be charged from cylinder as a
liquid unless entire cylinder is used. Use a
Refrigerant flow restrictor if charging liquid to
suction or to a system at pressure below a
saturated temperature of 32° F.
EPA recovery and handling requirements for
R-410A are the same as R-22.
Cooling the recovery cylinder will speed
recovery and lessen stress on recovery
equipment.
!
WARNING
Service on this equipment is to be performed by qualified refrigeration personnel
familiar with equipment operation, maintenance, correct servicing procedures, and the
safety hazards inherent in this work. Causes for repeated tripping of equipment
protection controls must be investigated and corrected.
Disconnect all power before doing any service inside the unit.
Servicing this equipment must comply with the requirements set forth by the EPA in
regards to refrigerant reclamation and venting.
Filter-Driers
Replace the filter-drier any time excessive
pressure drop is read across the filter-drier
and/or when bubbles occur in the sight glass
with normal subcooling. The maximum
recommended pressure drops across the filter-
drier are shown below.
Table 22, Filter-Drier Pressure Drop
PERCENT CIRCUIT
LOADING (%)
MAXIMUM RECOMMENDED
PRESSUREDROP ACROSS
FILTER DRIER PSIG (KPA)
100%
10 (69)
75%
8 (55.2)
50%
5 (34.5)
25%
4 (27.6)
Summary of Contents for AGZ 190D
Page 12: ...12 AGZ 025D through 190D OMM 1166 1 Figure 2 Typical Field Control Wiring...
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