AMX300 DIRECTCONNECT™ MIXING VALVE KITS
5
62-3113—01
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.
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.
.
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-
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.
Fig. 9. Thermostrip.
MAINTENANCE
Honeywell recommends that the AMX300 mixing valve kit be
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.
Table 1. Time/Temperature Relationship in Scalds.
Water Temperature
Time to scald (approximate)
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
FLOW VERSUS PRESSURE DROP
PRESSURE
DROP
(PSI)
FLOW (GPM)
50
40
30
20
0
4
12
16
20
M29789
MIXED
TEMPERATURE
OF 140°F
60
10
0
2
8
6
10
14
18
MIXED
TEMPERATURE
OF 120°F
MIXED
TEMPERATURE
OF 95°F
Thermostrip
Accuracy expires
after MMMYYYY
11
0
43
11
2
44
11
4
46
11
6
47
11
8
48
120
49
122
50
124
51
126
52
128
53
130
54
132
55
134
56
136
57
138
58
140
60
ºF ºc
11
6
47
11
8
48
120
49
122
50
124
51
M29700