High Temperature Limit Switch - Bosch W 325 K**T1 Installation, Operation And Maintanance

The water flow selector regulates the hot water output by
adjustng the flow rate of the water through the heater. Below
you will find listed the maximum that can be selected by
adjusting the water flow selector and the minimum flow rate
for main burner operation.
Also listed are the temperature rises that would be expected,
at flow rates indicated, when the heater is firing at full input.
WATER FLOW ADJUSTMENT RATE ALL
MODELS
Maximum Flow Rate
Model
(counter-clockwise to stop)
13 L/min.
W 325 (3.4 U.S. Gal./min.)
Rise 25° C (45° F)
15 L/min.
W 400 U.S. Gal./min.)
Rise 25° C (45° F)
*Note: If flow rate through the heater is less than the minimum
flow rate shown for the heater the main burner will not fire.
The minimum flow rate is the "THERSHOLD FLOW RATE"
referred to in the lighting instructions.
II W400 K5 Models only
These models do not have a manual flow selector knob.
Flow can be regulated using the water throttle screw on the
bottom of the water control valve (see fig.8).
Because this model is usually always used for full flow
applications such as recirculation to storage, pressure
washers, boosters, etc., this water throttle screw somes from
the factory srewed in (clockwise) to maximum flow position
to give flows and temperature indicated above.
GAS CONTROL SLIDE
With the gas control slide at the right hand stop the heater
will fire at its full rated input when water is drawn at a rate
that will cause the gas valve to open fully. The gas control
slide will restrict the input down to approximately 50% of
full rated input when adjusted to the left hand stop.

HIGH TEMPERATURE LIMIT SWITCH

The BOSCH W series instantaneous gas water heaters
are equipped with a high temperature switch with a set point
° C ( 194° F).
of approx. 90
point exceeds the set point the switch will open, interrupting
the safety circuit and stopping gas flow to the pilot and
main burner.
Outage as a result of high limit operation indicates that the
heater is not functioning properly. The heater should be
checked by a qualifed serviceman and reason for
malfunction corrected. To relight pilot follow instructions
provided on unit.
Minimum Flow Rate
(clockwise to stop)
5.8 L/min.
Temp. U.S. Gal./min.) Temp.
Rise 55° C (100° F)
(4.0 6.8 L/min.
Temp. U.S. Gal./min.)
Rise 55° C (100° F)
If the water temperature at the
(1.5
(1.8
Temp.
9