Bryant 583B instruction manual MonoportBurners, Ledindications

TABLE 7—AIR DELIVERY (CFM) AT INDICATED TEMPERATURE RISE AND RATED HEATING INPUT

HEATING					TEMPERATURE RISE °F
INPUT
(BTUH)	20	25	30	35	40	45	50	55	60	65	70
INPUT
40,000	1500	1200	1000	857	750	667	600	—	—	—	—
60,000	2250	1800	1500	1286	1125	1000	900	818	750	692	—
90,000	—	2700	2250	1929	1688	1500	1350	1227	1125	1038	964
115,000	—	—	—	2464	2156	1917	1725	1568	1438	1327	—
130,000	—	—	—	—	2438	2167	1950	1773	1625	1500	1393

NOTE: Dashed areas do not fall within the approved temperature rise range of the unit.

MEASURE MANIFOLD PRESSURE (Propane Units)—The main burner orifices on a propane unit are sized for the unit rated input when the manifold pressure reading matches the level specified in Table 6.

WARNING: If converting to propane gas, remove the burner assembly and inspect the heat exchanger tubes. If there are V-shaped NOx baffles installed in the firing tubes, THEY MUST BE REMOVED.

Discard the baffles after removal.

Refer to Maintenance section for information on burner removal.

Proceed as follows to adjust gas input on a propane gas unit:

1.Turn off gas to unit.

2.Remove pipe plug on manifold (see Fig. 16) then connect manometer at this point.

3.Turn on gas to unit.

4.Remove cover screw over regulator adjustment screw on gas valve.

5.Adjust regulator adjustment screw to the correct manifold pressure, as specified in Table 6. Turn adjusting screw clockwise to increase manifold pressure, or turn adjusting screw counterclockwise to decrease manifold pressure.

6.Replace cover screw.

7.Turn off gas to unit. Remove manometer from pressure tap. Replace pipe plug on gas valve, then turn on gas to unit. check for leaks.

CHECK BURNER FLAME—With burner access panel removed, observe the unit heating operation. Watch the burner flames to see if they are light blue and soft in appearance, and that the flames are approximately the same for each burner. Propane will have blue flame with yellow tips. (See Fig. 17). Refer to Maintenance section for information on burner removal.

BURNER FLAME

BURNER

MANIFOLD

C99021

Fig. 17—Monoport Burners

—15—

AIRFLOW AND TEMPERATURE RISE—The heating section for each size unit is designed and approved for heating operation within the temperature rise range stamped on the unit rating plate.

Table 7 shows the approved temperature rise range for each heating input, and the air delivery cfm at various temperature rises. The heating operation airflow must produce a temperature rise that falls within the approved range.

Refer to Indoor Airflow and Airflow Adjustments section on the following pages to adjust heating airflow when required.

HEATING SEQUENCE OF OPERATION—See Fig. 18-19 and unit wiring label.

On a call for heating, terminal "W" of the thermostat is energized, starting the induced-draft motor. When the hall-effect sensor on the induced-draft motor senses that it has reached the required speed, the burner sequence begins. This function is performed by the integrated gas control (IGC). The evaporator fan motor is energized 45 seconds after flame is established. When the thermo- stat is satisfied and "W" is de-energized, the burners stop firing and the evaporator fan motor shuts off after a 45-second time-off delay.

An LED (light-emitting diode) indicator is provided on the control board to monitor operation. The control board is located by removing the burner access panel. During normal operation, the LED is continuously on. See Table 8 for error codes.

TABLE 8—LED INDICATIONS

ERROR CODE	LED INDICATION
Normal Operation	On
Hardware Failure	Off
Fan On/Off Delay Modified	1 Flash
Limit Switch Fault	2 Flashes
Flame Sense Fault	3 Flashes
Four Consecutive Limit Switch Faults	4 Flashes
Ignition Lockout Fault	5 Flashes
Induced-Draft Motor Fault	6 Flashes
Rollout Switch Fault	7 Flashes
Internal Control Fault	8 Flashes
Internal Software Fault	9 Flashes

NOTES:

1.There is a 3-second pause between error code displays.

2.If more than one error code exists, all applicable error codes will be displayed in numerical sequence.

3.This chart is on the wiring diagram located inside the burner access panel.

LIMIT SWITCHES—Normally closed limit switch (LS) com- pletes the control circuit through the thermostat R circuit. Should the leaving-air temperature rise above the maximum allowable temperature, the limit switch opens and the R control circuit "breaks". Any interruption in the R control circuit instantly closes the gas valve and stops gas flow to the burners and pilot. The blower motor continues to run until LS resets.

When the air temperature at the limit switch drops to the low-temperature setting of the limit switch, the switch closes and completes the R control circuit. The electric spark ignition system cycles and the unit returns to normal heating operation. When this fault occurs, the IGC LED will display FAULT CODE 2.