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Table 2 — American/European Wire Conversions
LEGEND
START-UP
I. PRELIMINARY CHECKS
1. Check that all internal wiring connections are tight
and that barriers, covers, and panels are in place.
2. Make certain field electrical power source agrees
with unit nameplate rating.
3. Open all service valves.
II. LEAK TEST
Field piping and fan coil must be leak tested by the pressure
method. Use R-22 at approximately 25 psig (172 kPa) backed
up with an inert gas to a total pressure not to exceed
245 psig (1690 kPa).
III. EVACUATE AND DEHYDRATE
Field piping and fan coil must be evacuated and dehydrated.
IV. CHARGE SYSTEM
Release factory charge into system by opening (backseating)
liquid and suction line service valves. Add charge amount as
required for the total system. Refer to separate indoor unit
installation instructions for the required total system charge
when connected to the indoor unit.
V. TO START UNIT
NOTE: When using 538J unit in conjunction with 619 series
fan coils, refer to start-up instructions included with fan coil
for correct start-up procedures.
Be sure that field disconnect is closed. Set room thermostat
below ambient temperature. Operate unit for 15 minutes,
then check system refrigerant charge. See Refrigerant
Charging section on page 8.
Unit compressor starts after a 5-minute delay if equipped
with accessory Time Guard® II device.
SERVICE
I. OUTDOOR FAN
A reinforced wire mount holds the outdoor fan assembly in
place. See Fig. 7 for proper mounting positions.
II. HIGH-PRESSURE RELIEF VALVE
Valve is located in compressor. Relief valve opens at a
pressure differential of approximately 450 ± 50 psig (3100 ±
345 kPa) between suction (low side) and discharge (high
side) to allow pressure equalization.
III. INTERNAL CURRENT AND TEMPERATURE SENSITIVE
OVERLOAD
Control resets automatically when internal compressor
motor temperature drops to a safe level (overloads may
require up to 45 minutes to reset). When an internal over-
load is suspected of being open, check by using an ohmmeter
or continuity tester.
IV. PUMPDOWN PROCEDURE
The system may be pumped down in order to make repairs
on low side without losing complete refrigerant charge.
To pump down:
1. Attach pressure gage to suction service valve gage
port.
2. Frontseat the liquid line valve.
3. Start unit and run until suction pressure reaches
5 psig (34 kPa).
4. Shut unit off and frontseat suction valve.
5. Depressurize low side of unit and recover refrigerant
following accepted practice.
AMERICAN EUROPEAN
Industry
Standard Size
American Conversion
(mm)
Industry Standard
Size (mm
2
)
18 AWG 0.82 1.0
16 AWG 1.30 1.5
14 AWG 2.08 2.5
12 AWG 3.30 4.0
10 AWG 5.25 6.0
8 AWG 6.36 10.0
6 AWG 13.29 16.0
4 AWG 21.14 25.0
3 AWG 26.65 —
2 AWG 33.61 35.0
1 AWG 42.39 50.0
1/0 AWG 53.49 —
2/0 AWG 67.42 70.0
3/0 AWG 85.00 95.0
4/0 AWG 107.19 120.0
250 kcmil 126.64 150.0
300 kcmil 151.97 —
350 kcmil 177.90 185.0
400 kcmil 202.63 240.0
500 kcmil 253.29 300.0
600 kcmil 303.95 —
AWG — American Wire Gage
kcmil — Thousand Circular Mils
WARNING: Before performing recommended main-
tenance, be sure unit main power switch is off. Failure to
do so may result in electrical shock or injury from rotat-
ing fan blade.
CAUTION: The 538J unit coils hold only the
factory-designated amount of refrigerant. Additional
refrigerant may cause units to relieve pressure
through compressor internal pressure relief valve
(indicated by sudden rise of suction pressure) before
suction pressure reaches 5 psig (34 kPa). If this occurs,
shut off unit immediately, then frontseat the suction
valve and remove and reclaim excess refrigerant fol-
lowing accepted practice.
Fig. 7 — Condenser Fan Mounting Positions
UNIT 538J DIMENSIONS — in. (mm)
018 024-036 048-060
0.433 (11) 0.709 (18) 0.16 (4)