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Service Manual
24
1 Service
H: Control modes
Controlling Sensor
The SH controlling sensor parameter selects the sensor the
control will use to regulate the boiler firing rate. This parameter
is adjustable by the installer by accessing parameter H1. The
sensor selections are as follows: The outlet sensor regulates the
firing rate based on the outlet water temperature of the boiler
and the inlet sensor regulates the firing rate based on the inlet
water temperature of the boiler. If the outlet sensor is selected,
and the optional system supply sensor is connected, the control
will regulate the firing rate based on the system supply sensor
temperature. The default sensor is the Outlet Sensor.
BMS Thermostat Input (Active / Inactive)
When controlling the boiler through the 0 - 10V BMS input or
through ModBus, the boiler can be enabled one of two ways.
With parameter H2 set to ACTIVE, the boiler will enabled by
closing the Room Thermostat 1 input. With parameter H2 set
to INACTIVE, the boiler will be enabled by the voltage level on
the 0 - 10V input (in the case of 0 - 10V BMS control), or the
0 - 10V input value received through ModBus. The default
value is INACTIVE.
BMS (Active / Inactive)
The set point or modulation of the boiler may be controlled
through the 0 - 10V BMS input or through Modbus. When
parameter H3 is set to INACTIVE, the 0 - 10V input will be
ignored. When set to ACTIVE, the set point or modulation will
be controlled by the voltage on the 0 - 10V input (in the case of
0 - 10V BMS control), or the 0 - 10V input value received
through ModBus. The default value is INACTIVE.
Figure 1-2 Ramp Delay Interval
When finished, the installer can press the RIGHT SELECT
[SAVE] key to store the new settings, or the LEFT SELECT
[EXIT] key to return to the G parameter list without saving
the changes. The delay value can be set between 0 minutes
and 120 minutes. The limit value can be set between 0%
and 100%.
SH Ramp Delay
The SMART SYSTEM control can be programmed to limit
the firing rate for a fixed period of time at the start of a
space heating demand. There are six (6) possible limits,
each with their own time delay. The first limit applies as
soon as the burner starts. Once its time delay expires, the
second limit is applied and its timer begins. The control
steps through these limits until the 6th (sixth) limit expires.
Note, however, that the rate can be held to less than 100% if
so desired. The installer can adjust the firing limits and
time delays by accessing parameter G4. Once this
parameter is selected, the screen will show the step number,
the time delay for that step and the limit value
corresponding with that step. If the installer wishes to
adjust one of the values in that step, he can press the
NAVIGATION dial until the value he wishes to change is
flashing. The installer can then rotate the NAVIGATION
dial to adjust that value. If the installer presses the RIGHT
SELECT [SAVE] key while the limit value is flashing, the
step value will flash again. The installer can then select the
next step and adjust the delay and limit values
corresponding with that step.
Please note that the brackets ([])
denote screen status.
NOTICE