Bryant 538J-18-1 - Manual (Page 8)

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Table 3 — Electrical Data
LEGEND
*Permissible limits of the voltage range at which unit will operate
satisfactorily.
†Time-delay fuse.
NOTES:
1. Control circuit is 24 v on all units and requires an external power source.
2. All motors and compressors contain internal overload protection.
3. In compliance with NEC (U.S.A. Standard) requirements for multimotor
and combination load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR breaker.
4. Motor RLA values are established in accordance with UL (Underwriters’
Laboratories) Standard 465 (U.S.A. Standard).
V. LOW PRESSURE SWITCH
This switch, mounted on the suction line, has fixed non-
adjustable settings. To check pressure switch, attach pres-
sure gage to suction service valve gage port. Slowly close
liquid shutoff valve and allow compressor to pump down. Do
not allow compressor to pump down below 2 psig (14 kPa).
Compressor should shut down when suction pressure drops
to cutout pressure in Tables 1A and 1B, and should restart
when pressure builds up to cut-in pressure shown after
accessory CLO (compressor lockout) switch has been reset
and accessory Time Guard® II device has completed its tim-
ing cycle.
VI. SERVICE VALVES
The service valves in the outdoor unit come from the factory
frontseated. This means the refrigerant charge is isolated
from the line-set connection ports. To prevent damage to the
valve, use a wet cloth or other acceptable heat sink material
on the valve before brazing.
The service valves must be backseated (turned counterclock-
wise until seated) before the service port caps can be
removed and the hoses of the gage manifold connected. In
this position, refrigerant has access from the through out-
door and indoor unit. The service valve cannot be field
repaired; only a complete valve or valve stem seal and
service port caps are available for replacement.
VII. ACCURATER® (BYPASS TYPE) DEVICE
See Fig. 4 for bypass type AccuRater device components. The
piston has a refrigerant metering hole through it. The
retainer forms a stop for the piston in the refrigerant bypass
mode and a sealing surface for liquid line flare connection.
To check, clean or replace piston:
1. Shut off power to unit.
2. Pump down using Pumpdown Procedure section on
page 7.
3. Remove liquid line flare connection from AccuRater
device.
4. Pull retainer out of body, being careful not to scratch
flare sealing surface. If retainer does not pull out
easily, carefully use locking pliers to remove retainer.
5. Slide piston out by inserting a small soft wire, with
small kinks, through metering hole. Ensure metering
hole, sealing surface around piston cones, and fluted
portion of piston are not damaged.
6. Clean piston refrigerant metering hole.
7. Replace retainer O-ring before reassembling Accu-
Rater device (O-ring part no. 99CC501052).
VIII. REFRIGERANT CHARGING
NOTE: Do not vent or depressurize unit refrigerant to atmo-
sphere. Remove and recover refrigerant following practice.
A. Superheat Method (Cooling, Non-TXV)
To check and adjust charge during cooling season, use
Tables 4A-5B and the following procedure:
1. Operate unit a minimum of 15 minutes before check-
ing charge.
2. Measure suction pressure by attaching a gage to suc-
tion valve service port.
3. Measure suction line temperature by attaching a ser-
vice thermometer to unit suction line near suction
valve. Insulate thermometer for accurate readings.
4. Measure outdoor coil inlet-air dry bulb temperature
with a second thermometer.
5. Measure indoor coil inlet-air wet bulb temperature
with a sling psychrometer.
6. Refer to Tables 4A and 4B. Find air temperature enter-
ing outdoor coil and wet-bulb temperature entering
indoor coil. At this intersection, note the superheat
temperature.
7. Refer to Tables 5A and 5B. Find superheat tempera-
ture and suction pressure and note suction line
temperature.
8. If unit has higher suction line temperature than
charted temperature, add refrigerant until charted
temperature is reached.
9. If unit has lower suction line temperature than
charted temperature, remove and recover refrigerant
until charted temperature is reached.
538J V-PH-Hz
OPERATIONAL
VOLTAGE*
COMPRESSOR POWER SUPPLY
Min Max RLA LRA Fan FLA MCA
Max Fuse† or HACR-Type
Ckt Bkr Amps
018
208/230-1-60 187 254
10.7 47.0 .70 14.1 25
024 13.2 59.0 .70 17.2 30
030 15.7 73.0 .70 20.3 35
036 15.7 93.0 .70 20.3 35
048 24.3 131.0 .45 31.8 50
060 28.6 170.0 .45 37.2 65
FLA — Full Load Amps
HACR — Heating, Air Conditioning, Refrigeration
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps per NEC Section 430-24
NEC — National Electrical Code (U.S.A. Standard)
RLA — Rated Load Amps (Compressor)
WARNING: To prevent personal injury, wear
safety glasses and gloves when handling refrigerant.
Do not overcharge system — this can cause compressor
flooding.