4
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may
cause damage to electrical components. Such operation
would void any applicable Bryant warranty.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Before performing service or maintenance, be sure indoor unit
main power switch is turned OFF and indoor blower has
stopped.
Power Wiring
Unit is factory wired for voltage shown on nameplate. Provide
adequate, fused disconnect switch within sight from unit, readily
accessible, but out of reach of children. Provision for locking the
switch open (off) is advisable to prevent power from being turned
on while unit is being serviced.
Disconnect switch, fuses, and field wiring must comply with the
NEC and local code requirements. Use copper wire only between
the disconnect switch and unit. Use minimum 75 C wire for the
field power connection.
Route power wires through the opening in unit side panel and
connect in the unit control box as shown on the unit label diagram
and Fig. 5. Unit must be grounded.
LEGEND
NEC
—
National Electrical Code
TB
—
Terminal Board
TB Connections
Field Wiring
Factory Wiring
—
—
A07428
Fig. 5
---
Line Power Connections
Control Circuit Wiring
Control voltage is 24 v (40 va minimum). See Fig. 6 and unit label
diagram for field--supplied wiring details. Route control wire
through opening in unit side panel to connection in unit control
box.
A07429
Fig. 6
---
538B Typical Control Circuit Connections
NOTE
:
Use No. 18 AWG color--coded, insulated (35
_
C
minimum) wire. If thermostat is located more than 100 ft. (30.5 m)
from unit, as measured along the control voltage wires, use No. 16
AWG color--coded wire to avoid excessive voltage drop.
NOTE
: All wiring must conform to NEC and local codes.
NOTE
: Operating unit on improper line voltage constitutes abuse
and could affect Bryant warranty. See Product Data.
Do not
install
unit in a system where voltage may fluctuate above or below
permissible limits.
Refer to the Product Data for recommended fuse sizes. When
making electrical connections, provide clearance at the unit for
refrigerant piping connections.
NOTE
: The 538B units use the control transformer supplied with
the matched indoor unit.
START--UP
PRELIMINARY CHECKS
1. Check that all internal wiring connections are tight and that
all barriers, covers, and panels are in place.
2. Field electrical power source must agree with unit name-
plate rating.
3. All service valves must be open.
4. Belly--band crankcase heater must be tight on compressor
crankcase for those units with belly--band heaters.
EVACUATE AND DEHYDRATE
Field piping and fan coil must be evacuated and dehydrated.
CHARGE SYSTEM
Release charge into system by opening (backseating) liquid and
suction line service valves. Outdoor unit is charged for 15 ft (4.6
m) of 3/8--in. liquid line.
TO START UNIT
Be sure that the field disconnect is closed. Set room thermostat
below ambient temperature. Operate unit for 15 minutes, then
check system refrigerant charge. See Refrigerant Charging section.
NOTE
: When using in conjunction with 40QA fan coils, refer to
start--up instructions included with fan coil for correct start--up
procedures.
538B
