8.Once desired pressure is established, set unit setting for no call for heat, turn off main gas valve, remove pressure-measuring device, and replace 1/8-in. pipe plug and screw cap.

X.MAIN BURNERS

For most applications, main burners are factory set and should require no adjustment.

For applications at altitudes above 2000 ft, refer to Tables 31 and 32 for altitude compensation.

A.Main Burner Removal

1.Shut off (field-supplied) manual main gas valve.

2.Shut off power to unit.

3.Remove gas section access panel.

4.Disconnect gas piping from gas valve inlet.

5.Remove wires from gas valve.

6.Remove wires from rollout switch.

7.Remove sensor wire and ignitor cable from IGC board.

8.Remove 2 screws securing manifold bracket to basepan.

9.Remove 2 screws that hold the burner assembly to vestibule plate.

10.Lift burner/manifold assembly out of unit.

B.Cleaning and Adjustment

1.Remove burner rack from unit as described in Main Burner Removal section above.

2.Inspect burners, and if dirty, remove burners from rack.

3.Using a soft brush, clean burners and crossover port as required.

4.Adjust spark gap. See Fig. 39.

5.Reinstall burners on rack.

6.Reinstall burner rack as described above.

Table 31 — Altitude Compensation (Natural Gas)

ELEVATION

 

ORIFICE SIZE — NATURAL GAS

(ft)

Low

 

Medium

High Heat

High Heat

Heat

 

Heat

(6 Cell)

(8 Cell)

 

 

0-2,000

29

 

30

29

29

2,000

29

 

30

29

29

3,000

30

 

31

30

30

4,000

30

 

31

30

30

5,000

30

 

31

30

30

6,000

30

 

31

30

30

7,000

31

 

32

31

31

8,000

31

 

32

31

31

9,000

31

 

32

31

31

above 10,000

32

 

33

32

32

Table 32 — Altitude Compensation (LP Gas)

ELEVATION

 

ORIFICE SIZE — LP GAS

 

(ft)

Low

Medium

High Heat

High Heat

Heat

Heat

(6 Cell)

(8 Cell)

 

0-2,000

35

38

35

35

2,000

36

39

36

36

3,000

36

39

36

36

4,000

37

40

37

37

5,000

37

40

37

37

6,000

38

41

38

38

7,000

39

42

39

39

8,000

40

43

40

40

9,000

41

44

41

41

above 10,000

42

45

42

42

XI. FILTER DRIER

Replace whenever refrigerant system is exposed to atmosphere.

XII. PROTECTIVE DEVICES

A. Compressor Protection

Overcurrent

Each compressor has internal line break motor protection.

Overtemperature

Each compressor has an internal protector to protect it against excessively high discharge gas temperatures.

Compressor Lockout

If any of the safeties (high-pressure, low-pressure, freeze protection thermostat, compressor internal thermostat) trip, or if there is loss of power to the compressors, the cooling lockout (CLO) will lock the compressors off. To reset, manu- ally move the thermostat setting.

2 LEADS, #18 WIRE 1/32 INSULATION,

REGULATOR

600V. MAX., 105°C

ADJUSTMENT SCREW

 

(REMOVE COVER)

OUTLET PRESSURE TAP (PLUGGED) 1/8-27 N.P.T. THDS.

 

D-1

D-2

RECEPTACLE AND

ON

TAB COMBINATION

W-1

 

C1

 

TERMINAL

 

 

OFF

 

 

C2

 

 

PILOT ADJ.

W-2

PILOT CONNECTION

 

 

 

INLET PRESSURE TAP

 

 

 

FOR 1/4” O.D. TUBING

 

 

 

(PLUGGED)

(PLUGGED)

 

 

 

 

1/8 - 27 N.P.T. THDS.

RECEPTACLE TERMINAL

Fig. 38 — Gas Valve

41

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Image 41
Bryant 581A operation manual Main Burners, XI. Filter Drier, XII. Protective Devices

581A specifications

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