Maintenance Procedures - Honeywell AM-1 Series Installation Instructions Manual

provide mixed tempered water to connected fixtures. This
provides constant water temperature under different working
conditions.

MAINTENANCE PROCEDURES

Hard water conditions may result in scale deposits, causing
binding of internal parts in extreme cases. Cleaning the
internal parts will usually restore the valve to proper operating
conditions. In some cases, it may be necessary to replace the
lower assembly.
To clean and/or replace the lower assembly, shut off water
and:
1. With a screwdriver, remove screw and handwheel.
2. Loosen upper nut (do not remove) to allow engaging an
adjustable wrench on lower nut. Unscrew lower nut
(counterclockwise). This removes top assembly.
3. Brass top assembly will pop up. Remove lower assem-
bly, diffuser and spring.
4. Carefully remove any scaling (calcium deposit) or for-
eign particles from valve seat and other internal parts.
Use vinegar to remove calcium. Soak parts until calcium
becomes soft and can be scrubbed and washed off. Do
not use solvents or scratch metallic / Teflon
faces.
5. Replace cleaned spring, diffuser and lower assembly
following instructions below or use new replacement kit
assembly. For correct kit number, see Table 1.
Install spring, diffuser and lower assembly:
A. Insert spring onto diffuser.
B. Insert diffuser with spring end first into body.
C. Fit valve top assembly into lower assembly and insert into valve.
D. Tighten lower nut.
E. Reposition handwheel and insert screw. Turn handwheel to
desired temperature setting.
UPPER NUT
LOWER NUT
O RING
H
Fig. 3. AM-1 Series valves assembly.
®
coated sur-
HANDWHEEL
RETAINING RING
TOP ASSEMBLY
LOWER ASSEMBLY
DIFFUSER
SPRING
H C
MIX
VALVE BODY
M23941
Table 1. AM-1 Series Replacement Kits
Model Temperature Range
C 70°–120° F (21°–49°C)
STD 70°–145° F (21°–63° C)
2-1/4
(57)
B
Fig. 4. Dimensions in in. (mm).
3
AM-1 SERIES™
Part No.
AM-1-020 RP
AM-1-025 RP
A
Ø 1-51/64
(46)
H C
MIX
C
M23938
62-3075EFS—03