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

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

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