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thermostrip, ensure the hot water tank recovers from any
aquastat adjustment and the temperature of the hot water in
the heater has stabilized.
Measure the mixed water supply temperature by opening
the hot water tap at the nearest faucet supplied by the
AMX300 mixing valve. A minimum flow rate of 1 to 1.5 gpm
(4 to 6 L/min) is recommended for accurate temperature
readings on the thermostrip (see Fig. 8). Allow the hot water
to run until a steady temperature reading is displayed on
the thermostrip.
FLOW VERSUS PRESSURE DROP
60
50
40
PRESSURE
DROP
30
(PSI)
20
10
0
2
0
4
6
Fig. 8. Flow vs. pressure drop.
WARNING
Increasing water temperature increases the risk of
scald injury. Scalding may occur within 5 seconds
at a setting of 140°F (60°C). Water temperature
over 125°F (52°C) can cause burns or death from
scalds. Children, the disabled, and the elderly are
at highest risks of being scalded. Please feel the
water before bathing or showering.
.
Table 1. Time/Temperature Relationship in Scalds.
Water Temperature
155 °F (68 °C)
About 1 second
150 °F (66 °C)
About 1-1/2 seconds
145 °F (63 °C)
Less than 3 seconds
140 °F (60 °C)
Less than 5 seconds
135 °F (57 °C)
About 10 seconds
130 °F (54 °C)
About 30 seconds
125 °F (52 °C)
1-1/2 – 2 minutes
120 °F (49 °C)
More than 5 minutes
The mixed water supply temperature may require adjustment.
The mixing valve kit is set at approximately 120°F when the
arrow on the hand wheel and the arrow on the valve body are
aligned.
1. To Increase mixed water supply temperature: Push
in and rotate the hand wheel counter-clockwise until the
desired set point is reached as indicated on the ther-
MIXED
MIXED
MIXED
TEMPERATURE
TEMPERATURE
TEMPERATURE
OF 140°F
OF 120°F
OF 95°F
8
10
12
14
16
18
FLOW (GPM)
M29789
Time to scald (approximate)
AMX300 DIRECTCONNECT™ MIXING VALVE KITS
mostrip reading (see Fig. 9). Ensure the hand wheel
snaps back to a locked position once desired set point is
reached.
2. To Decrease mixed water supply temperature: Push
in and rotate the hand wheel clockwise until the desired
set point is reached as indicated on the thermostrip
reading (see Fig. 9). Ensure the hand wheel snaps back
to a locked position once desired set point is reached.
Thermostrip
Accuracy expires
after MMMYYYY
MAINTENANCE
Honeywell recommends that the AMX300 mixing valve kit be
20
checked annually to ensure proper operation. In areas with
adverse water conditions, such as extremely hard water, more
frequent intervals are recommended.
Hard water conditions may result in scale deposits causing
binding of internal parts in extreme cases. Scale build-up
occurs more quickly with high water hardness and higher
temperature of the water stored in the tank.
Cleaning the internal parts will usually restore the valve
operating conditions. In some cases, it may be necessary to
replace the thermostatic element assembly (See Fig. 10). A
Thermostatic Element Replacement Kit, AM-1-025RP, is
available through Honeywell distributors.
To remove scale from the internal surfaces of the AMX300
mixing valve, or to replace the thermostatic element, it is not
necessary to remove the valve from the piping. Simply
perform the following steps:
1. Shut off cold water supply to the water heater
2. Open a hot water faucet to drain hot water from the sys-
tem piping
3. Follow directions in the MAINTENANCE section of
"AMX300 Series DirectConnect™ Mixing Valve Installa-
tion Instructions", Honeywell literature # 62-3112 (sup-
plied with the AMX300 mixing valve kit)
4. Open the cold water supply shut-off valve until hot water
flows from the hot water faucet that was opened in step
2 above.
5. When a steady stream of water flows from the faucet,
close the faucet
6. Check for leaks on the AMX300 mixing valve and
tighten components as required
7. Restart the water heater, following the water heater
manufacturer's directions, and wait until it reaches set-
point and the temperature in the tank has stabilized
8. Test the temperature at the mixed water outlet (as
described in the TEMPERATURE ADJUSTMENT sec-
tion above) and adjust hand wheel position as neces-
sary to achieve desired temperature.
5
Fig. 9. Thermostrip.
M29700
62-3113—01
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