14
PC Program Instructions
6
Parameters
SH off-on differential (SH off/on df)
The SH Off-on Differential sets how many degrees below the
turn-off temperature the outlet temperature has to go before
the boiler will turn on. This parameter can be changed by
accessing parameter
4AE
. The temperature range of this
parameter is 0°F to 86°F. The default value is 20°F.
Drop of inlet temp before ending anti-cycling (Drop
in inlet)
The control will bypass the anti-cycling time if the inlet water
temperature drops too much. The control will use the inlet
water temperature when it shuts off as the starting point. If
the temperature drops this amount below the starting
temperature, the control will abort anti-cycling and allow the
boiler to fire. This parameter can be changed by accessing
parameter
4AF
. The temperature range of this parameter is
0°F to 86°F. The default value is 10°F.
Offset HW setpoint to end HW demand
When heating an indirect hot water tank (heat maker), the
tank temperature (or inlet temperature if a tank sensor is not
used) must rise above the tank setpoint (parameter
4AS
) by
this amount before the HW heat demand will end. This
parameter can be changed by accessing parameter
4AG.
The
temperature range of this parameter is 0° to 54°F (30°C). The
default setting is 0°.
Outdoor air shutdown temp (Out SD Setp)
When the outdoor air temperature rises above this point, the
control will inhibit all SH demands (HW demands will still be
active). This parameter can be changed by accessing
parameter
4AH
. The temperature range of this parameter is
0°F to 120°F (99°C). The default value is 80°F (27°C).
OA shutdown differential (Out SD df)
This is the number of degrees below parameter
4AH
the
outdoor air temperature must go before the boiler will again
respond to an SH demand. This parameter can be changed by
accessing parameter
4AI
. The temperature range of this
parameter is 0°F to 90°F (50°C). The default value is 10°F
(5°C).
Shift OA reset curve (Shift Air Reset)
The Shift Heat Curve shifts the actual setpoint above or below
the calculated setpoint by the number of degrees in this
parameter. This parameter can be changed by accessing
parameter
4AJ
. The temperature range of this parameter is
-27°F (-15°C) to 27°F (15°C). The default value is 0°. This
feature will be active if this parameter is set to anything other
than 0°.
Night setback temperature (NSB Setp)
Once the internal clock has been set correctly, the night
setback feature can be used to program a lower water
temperature setpoint for space heating. This parameter can be
changed by accessing parameter
4AK
. The temperature range
for this parameter is 32°F (0°C) to 140°F (60°C). With a
setting of 32°F (0°C) the feature is turned off. The default
value will be 32°F (0°C).
SH turn-off differential cascade (Casc off df)
The SH turn-off differential cascade sets how many degrees
above the SH setpoint the system temperature has to go before
the boiler will shut off. This parameter can be changed by
accessing parameter
4AL.
The temperature range of this
parameter is 0°F to 72°F (40°C). The default setting is 10°F
(5°C).
SH off-on differential cascade (Casc off/on df)
The SH off-on differential cascade sets how many degrees
below the turn-off temperature the system temperature has to
go before the boiler will turn back on. This parameter can be
changed by accessing parameter
4AM.
The temperature
range of this parameter is 0°F to 72°F (40°C). The default
setting is 20°F (10°C).
SH anti-cycling time (Anti-C t)
Once a SH demand has been satisfied, a set amount of time
must elapse before the control will respond to a new SH
demand. This helps prevent short cycling of the boiler. The
control will inhibit the new heat demand and “Anti-cycling”
will be shown on the display, until either this time has elapsed
or the water temperature drops below parameter
4AF
. This
parameter can be changed by accessing parameter
4AO
. The
time range for this parameter is 0 minutes to 40 minutes. The
default value is 1 minute.
Max service time (Max Serv t)
The service mode allows the installer to set the unit to a fixed
firing rate for the purpose of combustion analysis. The delay
sets the length of time the boiler will stay in the service mode
if no keys have been pressed before going back to its original
state. This parameter can be changed by accessing parameter
4AP
. The time range of this parameter is 0 minutes to 40
minutes. The default value is 20 minutes.
Tank setpoint temp
This setting is applied to the tank sensor (when connected). It
is used to start and stop the HW call for heat. This setting can
be changed by accessing parameter
4AS
. The temperature
range is 60°F (15.5°C) to 190°F (87.5°C). The default setting
is 120°F (49°C).
