Bryant DURAPAC PLUS 581A User Manual download pdf (Page 41)

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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

-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)

Table 32 — Altitude Compensation (LP Gas)

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.

ELEVATION

(ft)

ORIFICE SIZE — NATURAL GAS

Low

Heat

Medium

Heat

High Heat

(6 Cell)

High Heat

(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

ELEVATION

(ft)

ORIFICE SIZE — LP GAS

Low

Heat

Medium

Heat

High Heat

(6 Cell)

High Heat

(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

Fig. 38 — Gas Valve

OFF

W-1

W-2

D-1

D-2

PILOT

ADJ.

INLET PRESSURE TAP

(PLUGGED)

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

2 LEADS, #18 WIRE 1/32 INSULATION,

600V. MAX., 105°C

REGULATOR

ADJUSTMENT SCREW

(REMOVE COVER)

OUTLET PRESSURE

TAP (PLUGGED)

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

PILOT CONNECTION

FOR 1/4” O.D. TUBING

(PLUGGED)

RECEPTACLE AND

TAB COMBINATION

TERMINAL

RECEPTACLE TERMINAL

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 55 56

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Bryant DURAPAC PLUS 581A User Manual Page 41

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