User Guide

MX SERIES VALVES
3 62-3079
Service
To remove dirt, flush valve. Top remove calcium deposits, soak
valve in vinegar for 24 and flush or contact factory for
assistance. Do not attempt to field repair this calibrated valve.
Temperature Selection
The MX Series Valves are made in two ranges: 110°-150° F
(43°-66° C) and 90°-120° F (32°-49° C). The factory setting is
130° F (54° C), and 105° F (41° C) respectively. Change
temperature setting with an Allen wrench, which is included;
3/16 for MX 127 or a 5/16 for MX 128, MX 129 and MX 130.
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: MX 127
(1 in.); 11° F (6° C), MX 128 (1-1/4 in.), MX 129 (1-1/2 in.) and
MX 130 (2 in.), 7° F (4° C). Do not operate valve at
temperatures outside of its calibrated range of 110°-150° F
(43°-66° C) or 90°-120° F (32°-49° C). Use a thermometer to
verify temperature.
TYPICAL INSTALLATION DIAGRAMS
Domestic Water Mixing
Use when water temperature produced by heater is hotter that
desired at point of use. Many codes require that water supplied
to the system be limited to 120° F (49° C) max.
Fig. 1. Water heater without recirculation in inches (mm).
Fig. 2. Heater with recirculation in inches (mm).
Fig. 3. Water heater is used for domestic water and space
heating in inches (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 expan-
sion tank be installed as shown.Otherwise danger-
ously high pressures could result or water heater
safety relief valve will frequently expel water. If a “V”
device is not used, a thermal expansion tank is not
required.
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)