Service Manual
15
1 Service (continued)
Set Points
Space Heat 1 Set Point: Set point
The SH set point sets the water temperature set point used
during space heating calls.
Space Heat 1 Set Point: Min
The SH minimum set point determines the minimum
value to which a user can adjust the Space Heat 1 set
point without using the installer password. Note that with
Outdoor Reset, BMS, and other control modes, the actual
Space Heat set point can go below this value.
Space Heat 1 Set Point: Max
The SH maximum set point determines the maximum
value to which a user can adjust the Space Heat 1 Set Point
without using the installer password. Note that there are
scenarios when a boiler outlet temperature or even active
set point can exceed this value.
Space Heat 1 Set Point: Offset
The SH offset sets how many degrees above set point the
temperature can go before the boiler will shut off.
Space Heat 1 Set Point: Differential
The SH differential sets how many degrees below the
offset the temperature has to drop before the boiler turns
back on.
High Limit: ARHL
The SMART TOUCH control contains an integral Auto
Reset High Limit (ARHL) on the outlet of the heat
exchanger. Once the outlet temperature exceeds the
ARHL set point, the boiler will shut down and lock out.
Once the outlet temperature has dropped below this
set point, the RESET button on the LCD display can be
pressed to reset this lockout. If RESET is not pressed,
the control will attempt to automatically reset the lockout
after 15 minutes.
High Limit: MRHL
The SMART TOUCH control contains an integral Manual
Reset High Limit (MRHL) on the outlet of the heat exchanger.
Once the outlet temperature exceeds the MRHL set point, the
boiler will shut down and lock out. Once the outlet temperature
has dropped below this set point, the RESET button on the
LCD display must be pressed to clear this lockout.
DHW Boiler Set Point: Set point
When a DHW call for heat becomes active, the control will
use the DHW boiler set point to determine the firing rate of
the boiler based on the boiler outlet water temperature or the
system supply sensor depending on the DHW configuration
(Normal or Zone).
DHW Boiler Set Point: Offset
This parameter reflects the degrees above DHW boiler set point
the outlet temperature can go before the boiler will shut off.
DHW Boiler Set Point: Differential
This parameter reflects the degrees below DHW boiler offset
the outlet temperature has to go before the boiler turns on.
DHW Tank Set Point: Set Point
By installing a tank sensor, the SMART TOUCH control can
perform the tank thermostat function. The SMART TOUCH
control automatically detects the presence of this sensor, and
generates a call for heat when the tank temperature drops
below the tank set point minus the differential, and finishes the
call for heat when the tank temperature reaches tank set point.
DHW Tank Set Point: Min
This setting controls the minimum user set point for the tank
temperature.
DHW Tank Set Point: Max
This setting controls the maximum user set point for the tank
temperature.
DHW Tank Set Point: Differential
When a tank sensor is installed, the tank temperature must
drop this amount below the tank set point before the boiler
will turn on.
NOTICE
The SH maximum set point does not
serve as a functional operating limit
to the appliance. This setting only
limits what adjustment a user can
make without the installer password.
If a certain application requires a
hard limit on water temperature, the
ARHL or MRHL features should be
used.
NOTICE
DHW Tank Set Point: Min setting
does not constitute a minimum possible
temperature of the tank, but rather a
minimum allowable value of the DHW
Tank Set Point that can be applied
without the installer password.
The DHW Tank Set Point: Max setting
does not constitute a maximum possible
temperature of the DHW tank. Proper
scald protection is required regardless of
the value of this setting.
⚠CAUTION
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