WARNING
These mixing valves are equipped with an adjustable high temperature limit stop factory set at approximately
120°F (49°C) with an incoming hot water supply temperature of 150°F (65.5°C). If the hot water supply
temperature of the job is greater than 150°F (65.5°C), the valves when turned to full HOT will deliver water in
excess of 120°F (49°C) and the limit stop
MUST BE RESET BY THE INSTALLER!
TO RESET ADJUSTABLE HIGH TEMPERATURE LIMIT STOP:
TM-2020B LARGE MIXING VALVES
1. Loosen LTR screw
2. Remove SNAP CAP, SCREW & WASHER, Remove
POINTER.
3. Temporarily place POINTER on the spline rod, turn
RIGHT for warmer temperature, turn LEFT for cooler
temperature. When valve is delivering warmest temperature
desired, remove the pointer.
4. Replace POINTER on the spline rod so that its RIGHT
edge is resting against the STOP SCREW located on the
RIGHT SIDE OF THE COVER.
5. The new maximum temperature has now been set. Test this
temperature by holding a thermometer under the flow of
water to be certain it is as desired.
* LIMIT STOP MUST BE RESET AND RECHECKED
EACH TIME HANDLE IS REMOVED.
TM-2020B SMALL MIXING VALVES
POINTER
SET SCREW
SNAP
CAP
LTR
C
H
T HE RM OS TATIC
L EONARD
STOP
SCREW
IMPORTANT! ALL MIXING VALVES MUST BE SET AT THE SAME
OPERATING TEMPERATURE.
SEE PAGES: 6 & 7 FOR COMPLETE PARTS BREAKDOWN
Check for significant variations in outlet flow. Thermostatic valves will NOT provide the desired accuracy
outside of their flow capacity range. Minimum flows must be no less than shown (see Flow Capacities, page 12).
If installed on a recirculated hot water system, make certain the valve is piped according to Leonard’s Required
Piping Methods (see page 4).
REMEMBER! THIS IS A CONTROL DEVICE WHICH MUST BE CLEANED AND MAINTAINED
ON A REGULAR BASIS. (SEE MAINTENANCE GUIDE AND RECORD, MGR-1000).
2
WEB
ADJUSTMENT
FINE
SCREW
1017
ASSE
COLD
HOT
(REST STOP AGAINST SCREW)
SET SCREW
LTR
STOP
POINTER
POINTER SCREW
TM-2020B-2P ADJUSTMENT AND SERVICE ONLY
Leonard Type TM Thermostatic Water Mixing
Valves are simple in design and may be easily
cleaned, adjusted and repaired. If the installation
is accessible, servicing may be completed without
disconnecting the valves.
NOTE:
Parallel Systems include Thermostatic
Water Mixing Valves, which must be regularly
maintained
to
provide
best
performance.
Frequency of cleaning depends on quality of local
water conditions and usage. See Maintenance
Guide and Record MGR-1000
1. Loosen LTR Set Screw, remove POINTER SCREW.
2. Adjust POINTER to maximum desired temperature.
3. Remove POINTER, replace POINTER on spline rod with
STOP (which is cast into the underside on the pointer),
resting against the BOTTOM side of the WEB on the
FINE ADJUSTMENT SCREW.
4. If fine adjustment is needed, adjust FINE ADJUSTMENT
SCREW on the cover, loosen for hotter or tighten for
cooler temperature.
5. Replace POINTER and check temperature, if set to
desired temperature replace POINTER SCREW, and
tighten LTR SET SCREW.
6. The new maximum temperature has now been set. Test
this temperature by holding a thermometer under the flow
of water to be certain it is as desired.
*
LIMIT
STOP
MUST
BE
RESET
AND
RECHECKED
EACH
TIME
HANDLE
IS
REMOVED.