Type 4660
13
14. Install the front plate and the panel mounting plate
(if required).
15. Install the locking disk(s) with the tab(s) as close to
90 degrees to the right of vertical as possible.
16. If the locking disk(s) cannot be installed as de-
scribed in step 15, install the tab(s) between vertical
and 90 degrees, rather than beyond the 90 degree
position.
17. Perform steps 6 through 11 of the Bourdon tube/
flapper assembly replacement procedure.
Pilots With Set Point Indication
1. Perform steps 1 through 4 of the Bourdon tube/flap-
per assembly replacement procedure.
2. Remove the set point indication module by loosen-
ing the set screws that attach the module to the set
point assembly stem, and pulling it away from the front
plate (key 74).
3. Remove the screws (key 68) and the set point as-
sembly.
4. Install the new set point assembly and tighten the
screws.
5. Repeat steps 2 through 4 if both set point assem-
blies are to be replaced on a high-low version of the
pilot.
6. Install the front plate and the panel mounting plate
(if required).
7. Align the three posts on the set point indication
module(s) with the three holes on the front plate.
8. Push the set point indication module(s) flush with
the front plate and tighten the set screws. Do not over-
tighten the set screws.
9. Perform steps 6 through 11 of the Bourdon tube/
flapper assembly replacement procedure.
Parts Ordering
Whenever corresponding with the Fisher sales office
or sales representative about this equipment, always
mention the pilot serial number located on the name-
plate (key 76, figure 8) on the rear of the pilot. When
ordering replacement assemblies or parts, refer to the
11-character part number of each assembly or part as
found in the following parts list.
Parts Kits
Key Description Part Number
Block-and-Bleed Relay Assembly
––– Block-and-Bleed Relay Replacement Assy
(Includes block-and-bleed assembly
and keys 53 and 57)
Low Temperature (Fluorosilicone
Elastomers) R4660X AVR22
Standard Temperature (Nitrile
Elastomers) R4660X BBA22
Bourdon Tube/Flapper Assembly
––– Bourdon Tube/Flapper Assembly (Includes
Bourdon tube/flapper and keys 18, 27, 73)
Stainless Steel Bourdon Tube
Bourdon Tube Rating
100 psig (6.9 bar) R4660X BTFJ2
250 psig (17.2 bar) R4660X BTFK2
500 psig (34.5 bar) R4660X BTFL2
1000 psig (69.0 bar) R4660X BTFM2
1500 psig (103.4 bar) R4660X BTFN2
2500 psig (172.4 bar) R4660X BTFP2
5000 psig (344.8 bar) R4660X BTFR2
7500 psig (517.1 bar) R4660X BTFS2
N05500 (K-Monel) Bourdon Tube (NACE)
Bourdon Tube Rating
100 psig (6.9 bar) R4660X BTF12
250 psig (17.2 bar) R4660X BTF22
500 psig (34.5 bar) R4660X BTF32
1000 psig (69.0 bar) R4660X BTF42
1500 psig (103.4 bar) R4660X BTF52
2500 psig (172.4 bar) R4660X BTF62
5000 psig (344.8 bar) R4660X BTF72
7500 psig (517.1 bar) R4660X BTF82
10,000 psig (689.5 bar) R4660X BTF92
Front Cover Assembly
––– Front Cover Assembly (Includes keys 4,
6, 12, and 19) R4660X FCA22
Output Indicator
––– Output Indicator (Includes keys 13, 14,
88, 89, 90, and 91) R4660X 0PUT2
Set Point Assembly
––– Set Point Assembly
No Set Point (Includes keys 67, 69,
70, and 71) R4660X SPA32
Low Set Point (Includes set point
assembly and keys 67, 68, 69, 70, and 71) R4660X SPA22
High Set Point (Includes set point
assembly and keys 67, 68, 69, 70, and 71) R4660X SPA12
Set Point Indicator
––– Set Point Indicator (Includes set
point assembly and adjustment key)
High Set Point
Bourdon Tube Rating
100 psig (6.9 bar) R4660X SP1A2
250 psig (17.2 bar) R4660X SP1B2
500 psig (34.5 bar) R4660X SP1C2
1000 psig (69.0 bar) R4660X SP1D2
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