Bryant 581B Pre-Start-Up, START-UP Unit Preparation, II. GAS Piping, III. RETURN-AIR Filters

PRE-START-UP

WARNING: Failure to observe the following warn- ings could result in serious personal injury.

1.Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system.

2.Do not operate compressor or provide any elec- tric power to unit unless compressor terminal cover is in place and secured.

3.Do not remove compressor terminal cover until all electrical sources are disconnected.

4.Relieve all pressure from system before touch- ing or disturbing anything inside terminal box if refrigerant leak is suspected around compres- sor terminals.

5.Never attempt to repair soldered connection while refrigerant system is under pressure.

6.Do not use torch to remove any component. Sys- tem contains oil and refrigerant under pres- sure. To remove a component, wear protective goggles and proceed as follows:

a.Shut off electrical power and then gas to unit.

b.Recover refrigerant to relieve all pressure from system using both high-pressure and low-pressure ports.

c.Cut component connection tubing with tub- ing cutter and remove component from unit.

d.Carefully unsweat remaining tubing stubs when necessary. Oil can ignite when exposed to torch flame.

Proceed as follows to inspect and prepare the unit for initial start-up:

1.Remove all access panels.

2.Read and follow instructions on all WARNING, CAU- TION, and INFORMATION labels attached to, or shipped with, unit.

3.Make the following inspections:

a.Inspect for shipping and handling damages such as broken lines, loose parts, or disconnected wires, etc.

b.Inspect for oil at all refrigerant tubing connec- tions and on unit base. Detecting oil generally indicates a refrigerant leak. Leak-test all refrig- erant 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 on page 38 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

I. UNIT PREPARATION

Make sure that unit has been installed in accordance with installation instructions and applicable codes.

II. GAS PIPING

Check gas piping for leaks.

WARNING: Disconnect gas piping from unit when leak testing at pressure greater than 1/2 psig. Pres- sures greater than 1/2 psig will cause gas valve damage resulting in hazardous condition. If gas valve is sub- jected 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 man- ually closing the gas valve.

III. RETURN-AIR FILTERS

Make sure correct filters are installed in unit (see Table 1). Do not operate unit without return-air filters.

IV. OUTDOOR-AIR INLET SCREENS

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

V. COMPRESSOR MOUNTING

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

VI. INTERNAL WIRING

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

VII. REFRIGERANT SERVICE PORTS

Each unit system has 4 Schrader-type service ports: one on the suction line, one on the liquid line, and 2 on the compres- sor discharge line. Be sure that caps on the ports are tight. Two additional Schrader valves are located under the high- pressure and low-pressure switches, respectively.

VIII. HIGH FLOW REFRIGERANT VALVES

Two high flow valves are located on the hot gas tube coming out of the compressor and the suction tube going into the compressor. Large black plastic caps identify these valves. These valves have O-rings inside which screw the cap onto a brass body to prevent leaks. No field access to these valves is available at this time. Ensure the plastic caps remain on the valves and are tight or the possibility of refrigerant leakage could occur.

IX. 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 gages 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 pres- sure does not rise to normal levels:

1.Note that the evaporator fan (size 060 and 072 only) is probably also rotating in the wrong direction.

2.Turn off power to the unit and install lockout tag.

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