B
RADFORD
W
HITE
C
ORP.
Page 26
tank is drawing down, the heater will react to sustain
a minimum tank temperature. Boilers generally have
higher differentials than water heaters, to minimize
short cycling (see throttling range). The differential
is set by removing the cover of the A350 control
and adjusting the potentiometer marked “DIFF” (see
Figure 13).
5.5.3 Offset
The offset determines the temperature below the
controller’s setpoint where the throttling range begins.
It offsets the throttling range.
For instance, if the setpoint is 120°F (49°C) and
the offset is 5°F (3°C), then the unit’s throttling range
will begin at 115°F (46°C). Between 115°F (46°C) and
120°F (49°C), the Brute Magnum will be in low fire.
The offset can be adjusted between 0°F and 30°F
(0°C and 17°C) by removing the cover of the S350P
control and adjusting the Offset dial (see Figure 14).
5.5.4 Throttling
Range
The throttling range allows the Brute Magnum
to match the BTU demands of varying systems, by
allowing the user to choose the temperature range
through which the unit will modulate. This will tell
the controller how fast to respond to a change in
temperature. A small throttling range keeps the unit
in high fire more, and quickens the response of the
system. A larger throttling range allows the Brute
Magnum to spread its modulating range over a larger
temperature range.
Example, Imperial units: Using a temperature
setpoint of 120°F, with a 20°F differential, a 5°F
offset, and a throttling range of 10°F, the unit will
come on at 100°F and shut off at 120°F. The offset
will set the top of the throttling range 5°F under the
setpoint, which is 115°F in this example. Therefore,
the throttling range will cause the Brute Magnum to
modulate between 25% and 100% of full fire between
115°F and 105°F. Between 115°F and 120°F, the unit
will remain at low fire. Between 100°F and 105°F, the
unit will be at full fire.
Example, Metric units: Using a temperature
setpoint of 49°C, with a 11°C differential, a 3°C offset,
and a throttling range of 5°C, the unit will come on at
38°C and shut off at 49°C. The offset will set the top
of the throttling range 3°C under the setpoint, which is
46°C in this example. Therefore, the throttling range
will cause the Brute Magnum to modulate between
Figure 14. Control Parameter Graph.
Содержание BRHHH
Страница 2: ...BRADFORD WHITE CORP Page 2...
Страница 20: ...BRADFORD WHITE CORP Page 20 Figure 8 Water Heater Piping One Heater One Tank...
Страница 21: ...Brute Magnum Page 21 Figure 9 Water Heater Piping Multiple Heaters One Tank...
Страница 22: ...BRADFORD WHITE CORP Page 22 Figure 10 Water Heater Piping One Heater Multiple Tanks...
Страница 23: ...Brute Magnum Page 23 Figure 11 Water Heater Piping Multiple Heaters Multiple Tanks...
Страница 30: ...BRADFORD WHITE CORP Page 30 Figure 17 Wiring Diagram Size 1200 Standard and Codes A and F...
Страница 31: ...Brute Magnum Page 31 Figure 18 Wiring Diagram Sizes 1600 2000 and 2400 Standard and Codes A and F...
Страница 32: ...BRADFORD WHITE CORP Page 32 Figure 19 Wiring Diagram Size 1200 Code B...
Страница 33: ...Brute Magnum Page 33 Figure 20 Wiring Diagram Sizes 1600 2000 and 2400 Code B...
Страница 39: ...Brute Magnum Page 39 Figure 27 Gas Trains...
Страница 49: ...Brute Magnum Page 49 Figure 30 Combustion Components...
Страница 50: ...BRADFORD WHITE CORP Page 50 Figure 31 Gas Train Combustion Air Components...
Страница 51: ...Brute Magnum Page 51 Figure 32 Gas Train Components...
Страница 52: ...BRADFORD WHITE CORP Page 52 Figure 33 Electrical Components...
Страница 53: ...Brute Magnum Page 53 Figure 34 Heat Exchanger Water Path Components...
Страница 54: ...BRADFORD WHITE CORP Page 54 Figure 35 Heat Exchanger Water Path Components...
Страница 55: ...Brute Magnum Page 55 Figure 36 Jacket Components...
