Return-Air Filters; Outdoor-Air Inlet Screens; Compressor Mounting; Internal Wiring - Bryant Legacy 547K Service And Maintenance Instructions

Return-Air Filters

Ensure correct filters are installed in unit. (See "APPENDIX B —
PHYSICAL DATA" on page 55.). Do not operate unit without re-
turn-air filters.

Outdoor-Air Inlet Screens

Outdoor-air inlet screen must be in place before operating unit.

Compressor Mounting

Compressors are internally spring mounted. Do not loosen or
remove compressor hold down bolts.

Internal Wiring

Check all electrical connections in unit control boxes. Tighten
as required.

Refrigerant Service Ports

Each unit system has two /
1
service ports: one on the suction line, and one on the compres-
sor discharge line. Be sure that caps on the ports are tight.

Compressor Rotation

CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution can result in premature wear
and damage to equipment.
Scroll compressors can only compress refrigerant if
rotating in the right direction. Reverse rotation for
extended times can result in internal damage to the
compressor. Scroll compressors are sealed units and
cannot be repaired on site location.
On 3-phase units with scroll compressors, it is important to be cer-
tain compressor is rotating in the proper direction. To determine
whether or not compressor is rotating in the proper direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pres-
sure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure
does not rise to normal levels:
1. Note that the evaporator fan is probably also rotating in
the wrong direction.
2. Turn off power to the unit and install lockout tag.
3. Reverse any two of the unit power leads.
4. Re-energize to the compressor. Check pressures.
The suction and discharge pressure levels should now move to
their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direction,
the unit will make an elevated level of noise and will not provide

cooling.

Refrigerant Service Ports
Each system has two / -in. SAE flare (with check valves) ser-
1
4
vice ports: one on the suction line, and one on the compressor
discharge line. Be sure that caps on the ports are tight.
Cooling
Set space thermostat to OFF position. To start unit, turn on main
power supply. Set system selector switch at COOL position and
-in. SAE flare (with check valves)
4
fan switch at AUTO. position. Adjust thermostat to a setting be-
low room temperature. Compressor starts on closure of contactor.
Check unit charge. Refer to Refrigerant Charge section on
page 14.
Reset thermostat at a position above room temperature. Com-
pressor will shut off. Evaporator fan will shut off after a
30-second delay.
To shut off unit, set system selector switch at OFF position.
Resetting thermostat at a position above room temperature
shuts unit off temporarily until space temperature exceeds ther-
mostat setting.

Heating

To start unit, turn on main power supply. Set system selector
switch to the HEAT position and set thermostat at a setting
above room temperature. Set fan to AUTO position.
First stage of thermostat energizes the first stage of the electric
heaters. Second stage of thermostat energizes the second stage
of electric heaters (if installed). Check heating effects at air
supply grille(s).
If electric heaters do not energize, reset limit switch (located on
supply-fan scroll) by pressing button located between termi-
nals on the switch.
To shut unit off, set system selector switch to the OFF position.
Resetting thermostat at a position below room temperature
temporarily shuts unit off until space temperature falls below
thermostat setting.

Ventilation (Continuous Fan)

Set fan and system selector switches at ON and OFF positions,
respectively. Evaporator fan operates continuously to provide
constant air circulation.

FASTENER TORQUE VALUES

Table 29 — Torque Values
Heat shield screws
Stator motor mounting
screws
Fan rotor mounting
screws
Limit switch screws
Fan Deck bracket screws
Condenser fan motor
mounting screws
Condenser fan hub set
screw
Compressor mounting
bolts

START-UP, RTU OPEN CONTROLS

IMPORTANT: SET-UP INSTRUCTIONS
Installation, wiring and troubleshooting information for the
RTU Open Controller.: "RTU Open Multi-Protocol Control-
ler Factory-Installed Option – Controls, Start-up, Operation
and Troubleshooting Instructions." Have a copy of this man-
ual available at unit start-up.
53
30 in.-lb (3.4 Nm) ±2 in.-lb (0.2 Nm)
23 in.-lb (2.6 Nm) ±2 in.-lb (0.2 Nm)
23 in.-lb (2.6 Nm) ±2 in.-lb (0.2 Nm)
50 in.-lb (5.7 Nm) ±5 in.-lb (0.6 Nm)
50 in.-lb (5.7 Nm) ±5 in.-lb (0.6 Nm)
30 in.-lb (3.4 Nm) ±3 in.-lb (0.3 Nm)
60 in.-lb (6.8 Nm) ±5 in.-lb (0.6 Nm)
65 in.-lb (7.3 Nm) +10 in.-lb (1.2 Nm)