Bryan Boilers 250, & 300, 200 Pilot Spark Igniter Assembly, TRIPLE-FLEX Left Flue Collector View

block.

21.Control circuit transformer.

22.24 volt ac transformer.

23.12 volt dc power supply.

24.SOLA hydronic and flame supervision control.

25.Repeat cycle timer. This timer will ensure that a forced shut down and pre-start safety check is performed at least once in a 24

hour period. This timer has been incorporated into the SOLA control for newer boilers.

26.Gas limiting orifice valve. This valve is used to increase or decrease the gas / air ratio for combustion. Adjustments are made by removing the cap and using a flathead screwdriver. Clockwise rotation will increase the flue outlet % O2 levels and counter- clockwise will decrease the flue outlet % O2 level. Starting point adjustments are listed in the table. This vale is factory set and the number of turns out is written in black adjacent to the adjustment cap.

Boiler Model	Turns Out From
	Bottom
TF300	8-1/2 to 9
TF250	8-1/2 to 9
TF200	6-1/2 to 7
TF150	6-1/2 to 7

Table 5 Gas Limiting Orifice Rough Settings

27.Main low gas pressure switch (Manual Reset). This switch should be set 2 – 3 inches of water column below the minimum required supply gas pressure.

28.Supply gas pressure test port (1/4” NPT).

29.(-) Air pressure sensing line connection.

30.(+) Air pressure sensing line connection.

31.(-) Gas pressure sensing line connection.

32.(+) Gas pressure sensing line connection.

33.Burner internal temperature fuse. This fuse senses the internal burner temperature and will open at a temperature greater than 425oF.

15

Date: 8-4-2010

Revision: 0

Form: 2396

2.1.6PILOT SPARK IGNITER ASSEMBLY

Figure 9 Pilot Spark Igniter Assembly

1.Spark grounding screw.

2.Pilot igniter gas orifice (#49 Drill)

3.Shell body ¾”.

4.Gland nut.

5.Igniter electrode.

6.Brass bushing.

7.Gas inlet fitting.

2.1.7TRIPLE-FLEX LEFT FLUE COLLECTOR VIEW

Figure 10 Triple-Flex Left Flue Collector View

1.3” Lower drum cleanout and inspection opening.

2.Furnace tube access panel.

3.Convection tube access panel.

4.Primary air-to-air exchanger access cover.

5.ASME name-plate stamping.

6.Combustion air blower.

7.3” Upper drum cleanout and inspection.

8.ASME Safety relief valve.

9.Air filter 20” x 25”. This filter is a polyester coated fiberglass. The frame is made of fiberboard and has two tin-plated steel grills (one bonded to each side) as well as sealed corners to prevent dust leakage. Filters are marked with size and airflow direction.