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34
Table 15 — Preliminary Puron Refrigerant (R-410A)
Charge, lb (kg)
NOTES:
1. Preliminary charge is based on 25 ft (7.6 m) of interconnecting liquid line
piping between indoor and outdoor units.
2. For liquid line piping longer than 25 ft (7.6 m), use the following
information:
1
/
2
in. (12.7 mm) liquid line — 0.6 lb per 10 linear ft (0.27 kg per 3 m)
5
/
8
in. (15.9 mm) liquid line — 1.0 lb per 10 linear ft (0.45 kg per 3 m)
7
/
8
in. (22.2 mm) liquid line — 2.0 lb per 10 linear ft (0.91 kg per 3 m)
1
1
/
8
in. (28.6 mm) liquid line — 3.5 lb per 10 linear ft (1.59 kg per 3 m)
Adjust Refrigerant Charge
Due to the compact design of microchannel heat exchang-
ers, refrigerant charge is reduced significantly. As a result,
charging procedures for MCHX units require very accurate
measurement techniques. Charge should be added in small
increments. Using cooling charging charts provided, add or
remove refrigerant until conditions of the chart are met. As
conditions get close to the point on the chart, add or remove
charge in
1
/
4
lb increments until complete. Ensure that all fans
are on and all compressors are running when using charging
charts. If charging at low outdoor ambient, the condenser coil
can be partially blocked in order to increase head pressure.
With all fans operating and all compressors on the circuit
being serviced operating at full capacity, adjust the refrigerant
charge in accordance with the unit charging charts in Fig. 35-
56. Charge vapor into compressor low-side service port located
on the suction service valve. Measure pressure at the liquid line
service valve, making sure a Schrader depressor is used. Also,
measure liquid line temperature as close to the liquid service
valve as possible. Add charge until the pressure and tempera-
ture conditions of the charging chart curve are met. If liquid
pressure and temperature point fall above curve, add charge. If
liquid pressure and temperature point fall below curve, reduce
the charge until the conditions match the curve.
If the sight glass is cloudy, check refrigerant charge again.
See Fig. 57 and 58. Ensure all fans and compressors on the cir-
cuit being serviced are operating. Also ensure maximum allow-
able liquid lift has not been exceeded. If the sight glass is
cloudy, a restriction could exist in the liquid line. Check for a
plugged filter drier or partially open solenoid valve. Replace or
repair, as needed.
38AP UNIT SIZE
CIRCUIT A
CIRCUIT B
38APS025
24 (10.9)
—
38APD025
12 (5.6)
12 (5.6)
38APS027
26 (11.6)
—
38APD027
13 (6.0)
13 (6.0)
38APS030
29 (12.9)
—
38APD030
14 (6.5)
14 (6.5)
38APS040
39 (17.7)
—
38APD040
21 (9.5)
17 (7.8)
38APS050
48 (21.5)
—
38APD050
22 (9.9)
26 (11.6)
38APD060
27 (12.1)
29 (12.9)
38APD070
29 (12.9)
33 (15.1)
38APD080
29 (12.9)
46 (20.7)
38APD090
39 (17.7)
46 (20.7)
38APD100
46 (20.7)
46 (20.7)
CAUTION
Never charge liquid into the low pressure side of system.
Do not overcharge. During charging or removal of refriger-
ation, be sure indoor fan system is operating. Failure
to comply could result in personal injury or equipment
damage.
CAUTION
Charging procedures for MCHX (microchannel heat
exchanger) units require very accurate measurement tech-
niques. Charge should be added in small increments. Using
cooling charging charts provided, add or remove refriger-
ant until conditions of the chart are met. As conditions get
close to the point on the chart, add or remove charge in
1
/
4
lb increments until complete. Ensure that all fans are on
and all compressors are running when using charging
charts. Failure to comply may result in equipment damage.
Summary of Contents for GEMINI SELECT 38APD025
Page 6: ...6 Fig 4 Power Wiring Schematic 38APS APD025 030...
Page 7: ...7 Fig 5 Power Wiring Schematic 38APS040 050...
Page 8: ...8 Fig 6 Power Wiring Schematic 38APD040 060...
Page 9: ...9 Fig 7 Power Wiring Schematic 38APD070 100...
Page 10: ...10 Fig 8 Control Wiring Schematic 38APS025 050...
Page 11: ...11 Fig 9 Control Wiring Schematic 38APD025 060...
Page 12: ...12 Fig 10 Control Wiring Schematic 38APD070 100...
Page 85: ......