2502 Series
21
Note
Beam overtravel can jam the flapper
against the nozzle if the following step
is not performed.
3. Remove the flapper screw (key 93), lockwasher
(key 84), and flapper (key 60). Invert the flapper so
that the flapper hook is on the opposite side of the
beam from the nozzle (key 58), and secure with the
lockwasher and screw.
4. Perform the calibration procedure and any other
necessary part of the calibration sequence.
Disassembling Relay
Disassembly can be accomplished in the following
steps. Key numbers are shown in figure 17.
1. Remove the relay according to the Changing Relay
section.
2. Remove the orifice assembly (key 88) and check
for orifice plugging or damage. Replace the O-ring
(key 90) before installing the orifice assembly.
3. Remove the casing screws (key 96) and washers
(key 98), casing assembly (key 85), and top dia-
phragm (key 91). On a high-temperature relay also
remove the top gasket (key 100) that covers the top
diaphragm.
4. Remove the spacer ring (key 84), diaphragm as-
sembly (key 86), and relay spring (key 92) from the
relay body (key 83). On a high-temperature relay also
remove the bottom gasket (key 99) from underneath
the diaphragm assembly.
5. Remove the screws (key 97), spring plate (key 95),
spring plate gasket (key 94), spring (key 93), and
valve plug (key 87).
6. Inspect the diaphragms and gaskets and replace if
necessary. Also replace the spring and valve plug if
they show signs of corrosion. The lower diaphragm
comes as part of an assembly and must be installed
as such. Clean all parts thoroughly before assembling.
7. Put the valve plug and its spring in the relay body.
Replace the spring plate gasket and spring plate and
secure with four screws.
8. Place the relay spring in the relay body and, on a
high-temperature relay, install a bottom gasket. Install
the diaphragm assembly, spacer ring, and top dia-
phragm on the body so that all flow passage holes are
lined up. On a high-temperature relay also install a
gasket over the top diaphragm.
9. Put the casing assembly on the top diaphragm so
that the lugs on the casing and spacer ring line up and
are also lined up with the body lug.
10. Install the casing screws and tighten them slowly
to ensure a good seal.
11. Install the assembled orifice assembly, and install
the relay according to the Changing Relay section.
Parts Ordering
Whenever corresponding with the Fisher Controls
sales office or sales representative about this equip-
ment, always mention the controller type number and
the serial number found on the unit nameplate (figure
11). When ordering replacement parts, also state the
complete 11-character part number of each required
part as found in the following parts list.
Parts Kits
Key Description Part Number
Controller Parts Kit
Contains keys 12, 15, 21, 24, 38, 55, 57, 58, 60, 62, 63, 64,
77, 79, 84, 86, 87, 93, 101, and 187
Standard Temperature
R2502 X0L52
High Temperature
R2502 X0H52
Relay Parts Kit
Contains keys 22, 85, 86, 87, 88, 90, 91, 92, 93 and 94,
(99 and 100 high temp only)
Standard Temperature RRELAY X0L12
High Temperature
RRELAY X0H12
Relay Replacement Kit
Contains keys 22, 43, and the relay assembly
Standard Temperature RRELAY X0L22
High Temperature
RRELAY X0H22
Heat Insulator Parts Kit
Contains keys 35, 36, 37, 38, 39, 40, and 53
R2500XH 0012
Parts
List
Heat Insulator (figure 14)
35 Heat Insulator Assembly, stainless steel 22A0033 X012
36 Shaft Coupling, stainless steel
1A5779 35032
37 Shaft Extension, K-Monel
1B6815 40022
38 Set Screw, stainless steel (2 req’d) 1E6234 X0022
39 Cap Screw, steel, pl (4 req’d)
1A3816 24052
40 Cap Screw, steel, pl (4 req’d)
1V2395 28982
53 Washer, carbon steel, pl (4 req’d)
1B8659 28982
Controller Common Parts (figure 16)
1 Pilot Case Back, zinc
Types 2502 and 2502C
1J4157 44012
Type 2502F 23A2073 X012
2 Pilot Case Cover, aluminum 50B9454 X012
3 Door Handle, steel, pl
1C8972 25082
4 Door Handle Shaft (not shown),
stainless steel
1C8984 14012
5 Machine Screw, stainless steel
1C8958 X0022
6 Washer Spring, stainless steel
1C8970 36032
7 Door Hook, steel, pl
1C8971 25082
8 Elastic Stop Nut, steel, pl
1C8959 X0012
9 Drive Pin, (2 req’d)
1C8991 X0022
11 Relay Tubing
Copper 17A9100 X012
Stainless steel (2502 and 2502C only) 17A9100 X022
12* Ball Bearing Ass’y, brass, pl
1C8983 000A2
*Recommended spare part.
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