Pressure Regulation; Temperature Regulation - Bosch W 325 K**T1 Installation, Operation And Maintanance

PRESSURE REGULATION

The pressure regulator supplied with the water heater is
adjusted to operate on the gas specified on the rating plate,
and:
- in Canada, is factory preset to deliver gas at the high
altitude pressure setting listed on the rating plate and
as shown below.
- In the U.S., is factory preset to deliver gas at the standard
altitude setting listed on the rating plate and as shown
below.
The pressure setting of the gas pressure regulator should
be checked at installation to assure that the setting is correct
for the gas being used and the altitude at which the
appliance is installed. See rating plate on the unit, or the
chart below for proper settings.
In Canada, for a heater being installed at standard altitude
(o-2,000 ft. elevation) the manifold pressure should be reset
at installation to value shown on the rating plate, or chart
below, for standard altitude.
The gas pressures specified below refer to flow pressure
taken at the pressure tap in the gas inlet pipe (just above
pressure regulator), figure 9, while the heater is operating
at full input.
Appliance Regulator Pressure Setting
Model Type of Gas
kPa
natural 1.36
W325
propane 2.61
natural 1.09
W325
propane 2.11
natural 1.41
W400
propane 2.61
natural 1.14
W400
propane 2.09
*Note: The high altitude ratings listed are Canadian Gas
Association high altitude ratings for the appliances and are
only valid in Canada. In the U.S. the National Fuel Gas
Code, ANSI Z223. 1 /NFPA 54, recommends for high altitude
installations, above 2000 feet, that the input rate be reduced
4% for each 1,000 Feet above sea level.
Your appliance dealer and/or your local gas supplier should
be consulted in regard to any high altitude installation. If
field adjustment is required it should be performed by a
qualified serciveman experienced in such work.
Figure 9
8
Pressure
Altitude
Inches, W.C.
5.5 standard
10.5 (0-2,000 ft.)
4.4 high *
8.5 (2,000 - 4,500 ft.)
5.7 standard
10.5 (0-2,000 ft.)
4.6 high *
8.4 (2,000 - 4,500 ft.)
PRESSURE TAP
PRESSURE REGULATOR
MANUAL GAS VALVE IN OFF
POSITION

TEMPERATURE REGULATION

I W325K and W400K Models only
For domestic purposes the water flow selector should be
turned clockwise to stop and the gas control slide slid to
right hand stop and remain in those positions.
See figure 10.
Should overheating occur or the gas supply fail to shut
off, turn off the manual gas control valve to the appliance
and have the heater checked by a qualified serviceman to
determine the reason for te malfunction.
Figure 10
WATER FLOW SELECTION
With the water flow selector turned clockwise to the stop,
the heater's water valve will regulate the flow rate through
the heater permitting a maximum flow rate of:
- 5.8 L/Min. (1.5 U.S. Gal./min.), for W325
- 6.8 L/Min. (1.8 U.S. Gal./min.), for W400
This setting permits a person at a remote location to control
the water temperature by mixing more or less cold water
with the hot water supplied by the heater.
GAS CONTROL SLIDE
WATER FLOW SELECTOR KNOB
W325K AND W400K ONLY
WATER THROTTLE SCREW
W400K5 MODEL ONLY