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Start--up, general, Warning – Bryant 580J*04--12 User Manual

Page 43

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b. Inspect for oil at all refrigerant tubing connec-

tions and on unit base. Detecting oil generally

indicates a refrigerant leak. Leak--test all refri-

gerant tubing connections using electronic leak

detector, halide torch, or liquid--soap solution.

c. Inspect all field--wiring and factory--wiring con-

nections. Be sure that connections are completed

and tight. Be sure that wires are not in contact

with refrigerant tubing or sharp edges.

d. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin

comb.

4. Verify the following conditions:

a. Make sure that condenser--fan blade are correctly

positioned in fan orifice. See Condenser--Fan

Adjustment section 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

installation instructions and applicable codes.

Gas Piping

Check gas piping for leaks.

UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal

injury or death.
Disconnect gas piping from unit when leak testing at

pressure greater than 1/2 psig. Pressures greater than

1/2 psig will cause gas valve damage resulting in

hazardous condition. If gas valve is subjected to

pressure greater than 1/2 psig, it must be replaced

before use. When pressure testing field--supplied gas

piping at pressures of 1/2 psig or less, a unit connected

to such piping must be isolated by manually closing

the gas valve.

!

WARNING

Return--Air Filters

Make sure correct filters are installed in unit (see

Appendix II -- Physical Data). Do not operate unit without

return--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 1/4” SAE flare (with check

valves) service ports: one on the suction line, and one on

the compressor discharge line. Be sure that caps on the

ports are tight.

Compressor Rotation

On 3--phase units with scroll compressors, it is important

to be certain compressor is rotating in the proper

direction. To determine whether or not compressor is

rotating in the proper direction:

1. Connect service gauges to suction and discharge pres-

sure fittings.

2. Energize the compressor.
3. The suction pressure should drop and the discharge

pressure 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.

Cooling

Set space thermostat to OFF position. To start unit, turn on

main power supply. Set system selector switch at COOL

position 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.

Reset thermostat at a position above room temperature.

Compressor 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 thermostat setting.

Main Burners

Main burners are factory set and should require no

adjustment.

To check ignition of main burners and heating controls,

move thermostat setpoint above room temperature and

verify that the burners light and evaporator fan is

energized. Check heating effect, then lower the thermostat

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