Sheet 4343-3
North American TwinBed® II Pilots, Flame Detection and Bypass Air
2
Typical Pilot Arrangement for TwinBed II
1
Pilot and Cooling Air
6
3
11
15
14b
14a
10
10
7
13
5
4
12
9
9
16
Pilot Gas
8
2
2
18
Cooling Air
17
Observation Port
Indicates pressure reference line Min. 3⁄8 " OD tubing
Air (pilot/cooling) Line (for -7A thru -8B TwinBed II)
Gas Line (all burner sizes)
1) 7349-3-G 1½" pressure reducing regulator, green spring (12-28"w.c.) 2) 1836-03 ¼" needle valve, cooling air pressure measurement 3) 1122-3 1½" pilot air butterfly valve 4) 1836-03
9) 1821-02
3⁄8 " ball valve
10) 1486A-02 11) 7350-02-A 12) R930-6055
3⁄8 " solenoid valve
3⁄8 " regulator
3⁄8 " needle valve
13) 1836-03
¼ " needle valve, pilot gas pressure measurement
¼" needle valve, pilot air pressure measurement
5) 8777-3 6) 1122-2 7) 1836-03 8) 8777-2
1½" flexible nipple
Pilot / Flame Scanners / Flame Rod (all burner sizes) 14a) 4020-3A-CB
1¼" cooling air butterfly valve
¼" needle valve, cooling air pressure
nozzle mix pilot tip for -7A thru -8B burner sizes nozzle mix pilot tip for -9 thru -12B burner sizes
1¼" flexible nipple
4020-3-CB 4020-4-CB
nozzle mix pilot itpe for -14 burner size
Air (pilot/cooling) Line (-9 thru -12B TwinBed II)
14b) 4-25432-1 15) 1836-03 16) see page 3
pilot flame rod assembly
¼" needle valve (cooling air, pilot UV) main flame scanner assembly and adapter with cooling air connection.
1) 7349-4-G 2" pressure reducing regulator, green spring (12-28"w.c.) 2) 1836-03 ¼" needle valve, air pressure measurement 3) 1122-3 1½" pilot air butterfly valve 4) 1836-03 ¼" needle valve, pilot air pressure measurement 5) 8777-3 1½" flexible nipple 6) 1122-3 1½" cooling air butterfly valve 7) 1836-03 ¼" needle valve, cooling air pressure 8) 8777-3 1½" flexible nipple
Ignition (all burner sizes) 17) 4065-6NI-6A
ignition transformer
18) 4085-5
ignition cable, 5'
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