Filter
Top Products
Brute Magnum
Page 25
temperature is less than 140°F (60°C), internal mixing
will keep the outlet temperature at 160-165°F (71-
74°C), and this will mix with the tank temperature
to maintain a lower temperature in the tank. If the
return temperature is 140°F (60°C) or higher, the
outlet temperature of the heater will be the return
temperature plus 20-25°F (11-14°C) when the Brute
Magnum is at high firing rate.
The manual reset high limit is on the outlet of
the Brute Magnum. Set the manual reset high limit at
about 20°F (11°C) higher than the highest expected
outlet temperature, to avoid nuisance lockouts
5.4.2 Internal Water Heater
Temperature Control
When an external control is not used, the
circulator between the heater and the storage tank
must run continuously, so that the heater’s temperature
control can detect and control the water temperature
in the storage tank. The Brute Magnum water
heater’s temperature control is adjusted to its lowest
temperature position when shipped from the factory.
This is the preferred starting point for setting the
temperature control.
The Brute Magnum temperature control measures
temperature on the heater inlet, sensing return water
temperature. If the return water temperature is less
than 140°F (60°C), internal mixing will keep the outlet
temperature at 160-165°F (71-74°C), and this will
mix with the tank temperature to maintain a lower
temperature in the tank. If the return temperature is
140°F (60°C) or higher, the outlet temperature of the
heater will be the return temperature plus 20-25°F (11-
14°C) when the Brute Magnum is at high firing rate.
The manual reset high limit is on the outlet of
the Brute Magnum. Set the manual reset high limit at
about 20°F (11°C) higher than the highest expected
outlet temperature, to avoid nuisance lockouts.
Caution
Should overheating occur or the gas supply fail to
shut off, turn off the manual gas control valve to the
appliance.
5.5 Temperature Control Features
The Brute Magnum temperature control is
versatile and will allow the user to better match the
modulating control to the application. Settings that
can be changed are temperature setpoint, differential,
offset, throttling range, and minimum output.
The temperature setpoint is the setting at which
the unit will shut off, having satisfied the controller’s
call for heat.
The differential determines how far the
temperature in the Brute Magnum can fall before
energizing again.
The offset determines where the throttling range
begins.
The throttling range is the temperature range
through which the unit will modulate from minimum
to maximum firing rate.
Important Note: These control parameters work
together. Therefore, setting one parameter may have
an affect on another. Figures 14, 15 and 16 show the
relationships between these settings. Figure 14 follows
the examples that are shown in the following sections,
and Figures 15 and 16 are examples of how the
parameters can interfere with each other.
5.5.1 Temperature Setpoint
The temperature setpoint is the point at which the
temperature control relay will be de-energized and the
unit’s call for heat will end. The temperature setpoint
is adjusted with the setpoint dial on the A350 control
(see Figure 13). The temperature control’s sensor is in
the inlet of the unit.
Figure 13. Proportional Control.
Note: Jumper must be in “Reverse Acting” mode, or unit will not
operate properly.
5.5.2 Differential Setting
The differential is the difference in temperature
settings when the temperature control’s relay is
energized and de-energized. For instance, if the
temperature setpoint is 120°F (49°C) and the
differential is 20°F (11°C), the temperature control
will call the unit to energize at 100°F (38°C). (The
differential is the setpoint minus the differential
setting) The call for heat will end when the unit
reaches its setpoint of 120°F (49°C). The Brute
Magnum differential is adjustable from 1°F to 30°F
(1°C to 17°C). In general, the differential setting for a
water heater system will be low, so that when a storage