Lawler 66 Series, Installation & Maintenance Manual

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Series 66 Cut-away
1. Place a 3/8”
wooden dowel
rod into center of
thermostat then
place in 85°F water.
Make a reference
mark on the rod as
shown in fig. A.
2. Now insert
thermostat into hot
water that is at least
20°F higher than
the set temperature
stamped on label.
3. The rod should
move out of
the thermostat
approximately 1/8”.
If the rod shows no
movement or can
be pushed inward,
a new thermostat is
required.
REFERENCE
MARKS
THERMOSTAT
Figure A
1
19
2
18
21
Figure B
See Fig. B
8
7
22
See Fig. C
42
10
13 14
41 35
34 33
32
31
30
29 28
27 26
25
24
Figure C
11
12
36
37
39
38
Item Description Part No.
1 Screw 7628-00
2 Adjusting Screw 8737-00
7 Bonnet Gasket —
8 Dome —
10 Liner O-Ring —
11 Liner —
12 Plunger/ —
Piston Liner Assembly Figure C*
13 Valve Spring —
14 Bottom Plug —
18 Pusher O-Ring —
19 Bonnet —
20 Label (NS) —
21 Pusher —
22 Thermostat —
23 Body Screw (NS) —
24 Liner Gasket, Upper —
25 Valve Body —
26 Tailpiece —
27 Union Nut —
28 Stop & Check Stem —
29 S & C Stem O-Ring —
30 S & C Bonnet —
31 Strainer —
32 S & C Spring —
33 Shutoff Disc Assembly —
34 S & C Body —
35 Seat O-Ring —
36 Pushrod —
37 Spring Retainer —
38 Relief Spring —
39 Acorn Nut —
41 Liner Gasket, Lower —
42 S & C Gasket —
(NS) - Not Shown
Item 42 only applicable to the 66-200 Kit
*Only available as assembly
Item Description Contains
1 Complete Repair Kit 7-10-12a-13-18-22-24-31-32-35
2 Piston & Liner Assembly 11-12a
3 Stop & Check Repair Kit 28-29-31-32-33-35-42
4 Thermostat Repair Kit 7-22
5 Bonnet Assembly 1-2-18-19-21
6 O-Ring & Gasket Kit 7-10-18-24-29-35-41-(42)
Repair Kits and Assemblies