Thomas & Betts BE, FE warranty Burner Orifices, Flash Carryover, Heat Exchanger, Fan or Blower

Figure 31

-Ignition Controller Location

Ignition Controller for Spark Pilot

34. Burner Orifices

Heaters are shipped with orifices of proper size and type for gas and altitude specified on the order. When ordering replacement orifices, give BTUH content, specific gravity of gas, and altitude, as well as model and serial number of the heater.

Main Burner Orifices (sea level)

Model	Natural Gas			Propane Gas
Size	Drill	Orifice	Qty	Drill Size	Orifice	Qty
	Size	P/N			P/N
25	51	39650	2	60	95936	2
50	47	84853	3	1.2MM	63003	3
75	45	38678	4	1.3MM	64676	4
100	44	11833	5	55	11830	5
125	44	11833	6	55	11830	6
165	35	11831	5	1.65MM	96344	5
200	35	11831	6	1.65MM	96344	6
250	35	11831	8	1.65MM	96344	8
300	35	11831	9	1.65MM	96344	9
400	35	11831	12	1.65MM	96344	12
Pilot	Natural - P/N 103034			Propane - P/N 98695
Orifice

WARNING: Do not use this table for gas conversion. Additional parts are required; contact your Reznor Distributor.

35. Flash Carryover

See Figure 32. The burner carryover system receives its gas supply from the main burner ports. Check the carryover assembly and also the main burner ports for cleanliness. Clean with air pressure.

Flash

CAUTION: Eye protection is recommended.

36. Heat Exchanger

The outside of the heat exchanger can be cleaned from the front of the heater with an air hose and/or a brush. Remove all accumulated dust and grease deposits.

The inner surfaces of the heat exchanger can be reached for cleaning with the burner rack removed. (See Paragraph 32.) Cleaning can be done with a long furnace brush or a heavy wire to which steel wool has been attached. Brush up and down inside each heat exchanger tube until all foreign material is removed. A flashlight is helpful in examin- ing the upper section of the tube.

37. Fan or Blower

Remove dirt and grease from the motor.

On fan model units, remove dirt and grease from the fan guard and blades. Use care when cleaning the fan blades to prevent causing mis- alignment or imbalance. Check that the hub of the fan blades is secure to the shaft.

On blower models, remove the grease and dirt from the blower hous- ing and check the belt for wear and proper tension (See Paragraph 14.)

Lubricate if the motor has oil cups or grease fittings. The motor sup- plied as standard has lifetime lubrication and sleeve bearings.

On blower models, check current draw to motor rating plate.

Fan Models: Follow these instructions for replacement of the fan guard, fan motor or fan blades.

1.If the heater is installed, turn off the gas and disconnect the electric power.

2.Remove the left outer side panel (left when facing the rear of the unit). Disconnect the fan motor wires.

3.Depending on the date that the heater was manufactured, it will have either a lower-half fan guard only, two-piece full fan guard, or a one- piece full fan guard. If the unit has a two piece fan guard, remove the tension mounted upper half fan guard and the four screws that hold the lower half. If the unit has a one-piece fan guard, remove all of the screws that retain the fan guard. Remove the assembled parts (the fan guard, the motor and the fan blade).

4.Disassemble and replace whatever parts are needed and reassemble using whatever part(s) are being replaced and the original parts. If the fan guard is being replaced, it is important that the same hardware be used for attaching the motor to the fan guard as was used with the original guard. These screws are especially made to cut through the coating on the fan guard to provide adequate grounding for the motor.

Figure 33 -	Fan
	Motor
Proper Position
of the Fan
Blade on the	A	Fan Hub
Motor Shaft

Carryover

Figure 32 -

Burner

Rack Flash

Carryover

Be sure the fan blade is in proper position on the shaft. Position the fan as shown in Figure 33 accord- ing to the chart on the right.

Model	Set Screw	“A” Hub to
Size	Torque In-Lbs	Motor
25	80 + or - 10	1-1/4" (32mm)
50	80 + or - 10	3/8"(10mm)
75	80 + or - 10	1/8" (3mm)
100-125	120 + or - 10	2-1/2" (64mm)
165-400	150 + or - 10	2-1/2" (64mm)

Mfg P/N 98807 Rev 8, Page 25