Start-Up, General; Unit Preparation; Additional Installation/Inspection; Return-Air Filters - Bryant 547K 04-07 Series Service And Maintenance Instructions

4. Verify the following conditions:
a. Make sure that condenser-fan blade are correctly posi-
tioned in fan orifice. See Condenser Fan Adjustment sec-
tion for more details.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain trap is filled with water
to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts
have been removed.

START-UP, GENERAL

Unit Preparation

Make sure that unit has been installed in accordance with in-
stallation instructions and applicable codes.
In addition to the base unit start-up (unit with electro-mechani-
cal control), there are a few steps needed to properly start-up
units with optional direct digital controls (DDC). The DDC's
Service Test function should be used to assist in the base unit
start-up and also allows verification of output operation. Con-
troller configuration is also part of start-up. This is especially
important when field accessories have been added to the unit.
The factory pre-configures options installed at the factory.
There may also be additional installation steps or inspection re-
quired during the start-up process.

Additional Installation/Inspection

Inspect the field-installed accessories for proper installation,
making note of which ones do or do not require configuration
changes. Inspect the DDC Alarms for initial insight to any po-
tential issues. Refer to the Controls, Start-up, Operation and
Troubleshooting Instructions manual for the specific DDC. In-
spect the SAT sensor for relocation as intended during installa-
tion. Inspect special wiring as directed below.

Return-Air Filters

Ensure correct filters are installed in unit. (See "PHYSICAL
DATA" on page 60.). Do not operate unit without return-air fil-
ters.

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 1/4 in. SAE flare (with check valves)
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

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
certain compressor is rotating in the proper direction. To deter-
mine whether or not compressor is rotating in the proper
direction:
1. Connect service gauges 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 2 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 1/4 in. SAE flare (with check valves) ser-
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 posi-
tion and fan switch at AUTO. position. Adjust thermostat to a
setting below room temperature. Compressor starts on closure
of contactor.
Check unit charge. Refer to Refrigerant Charge section on
page 15.
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.
57
CAUTION