Product Overview

MX SERIES VALVES
3 38-00035EFS—02
Temperature Selection
The MX Series Valves are made in ranges: 113°-149° F
(45°-65° C). The factory setting is 130° F (54° C). Change
temperature setting with an Allen wrench, which is
included; 3/16 for MX127LF or a 5/16 for MX128LF,
MX129LF and MX130LF. Punch through the center of the
temperature range label. By turning the screw clockwise,
the mix temperature increases (counterclockwise, it
decreases). Each complete turn with the Allen wrench
changes the temperature as follows: MX127LF (1 in.);
11° F (6° C), MX128LF (1-1/4 in.), MX129LF (1-1/2 in.)
and MX130LF (2 in.), 7° F (4° C). Do not operate valve at
temperatures outside of its calibrated range of 113°-
149° F (45°-65°). Use a thermometer to verify
temperature.
TYPICAL INSTALLATION
DIAGRAMS
Domestic Water Mixing
Use when water temperature produced by heater is hotter
than desired at point of use. Many codes require that
water supplied to the system be limited to 120° F (49° C)
max.
Fig. 3. Water heater without recirculation. Dimensions
shown in in. (mm).
Fig. 4. Heater with recirculation. Dimensions shown in
in. (mm).
Fig. 5. Water heater is used for domestic water and
space heating. Dimensions shown in in. (mm).
1.= Check Valve.
2. = Alternate Pump Location.
V.= Any device which turns the domestic water system into
a closed system, such as backflow preventers, check
valves or pressure reducing valves.
NOTE: “V” is optional depending on local codes. If a “V”
type valve is used, it is mandatory that a thermal
expansion tank be installed as shown.Otherwise
dangerously high pressures could result or water
heater safety relief valve will frequently expel
water. If a “V” device is not used, a thermal expan-
sion tank is not required.
Space Heating
Boiler must operate at a water temperature higher than
desired temperature in the heating system in order to
perform at maximum efficiency. Example: Radiant floor
heating.
M23686
WATER
HEATER
TO DISHWASHER
IF PERMITTED
BY CODES
MX SERIES
VALVE
HEAT TRAP
EXPANSION
TANK
ALLOWABLE
SERVICE
VALVE
LOCATION
COLD
WATER
SUPPLY
V
(1)
M
H
C
8
(203)
MAX
6
(152)
M23687
WATER
HEATER
TO DISHWASHER
IF PERMITTED
BY CODES
MX SERIES
VALVE
8
(203)
MAX
6
(152)
HEAT
TRAP
EXPANSION
TANK
ALLOWABLE
SERVICE
VALVE
LOCATION
COLD
WATER
SUPPLY
V
T
PUMP
(1)
M
H
C
RECIRCULATION
(1)
(1)
M23688
WATER
HEATER
TO DISHWASHER
IF PERMITTED
BY CODES
HEAT
TRAP
EXPANSION
TANK
ALLOWABLE
SERVICE
VALVE
LOCATION
COLD
WATER
SUPPLY
V
T
PUMP
(1)
M
H
C
RECIRCULATION (IF
NO RECIRULATION
IS REQUIRED OMIT
DASHED PIPING)
(1)
FAN COIL
CONNECTIONS
TO SIDE TAP
WATER HEATER
CONNECTIONS TO
CONVENTIONAL
WATER HEATER
WATER
USE
FIXTURES
FAN COIL
8
(203)
MAX
6
(152)