Lochinvar HERALD HCB116CE, Руководство по установке

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21.8 RAMP SETTINGS
Please note that the brackets ([]) denote screen status.
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 or BMS set point 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 6th limit will also limit
the rate for the rest of that heat demand. The installer can adjust the firing limits and time delays by accessing the
Ramp Settings parameter. 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.
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 Anti-Cycling parameter list without saving the changes. The delay value can be
set between 0 minutes and 40 minutes. The limit value can be set between 0% and 100%.
21.9 CONTROL MODES
21.9.1 C
ONTROLLING
S
ENSOR
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 the Controlling Sensor parameter. 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.
21.9.2 C
ASCADE
A
DDRESS
The boiler designated as the Leader needs to be programmed with address 0. All the Member boilers require
addresses from
1 to 7, and the addresses must be different for each Member. The addresses can be in any order, regardless of the
order in which the units are wired together. This parameter is adjustable by the installer by accessing the Cascade
Address parameter. The outdoor air (if used) and system supply sensor must be connected to the Leader boiler. The
default address is 1.
21.9.3 M
AXIMUM
C
ASCADE
S
ET
P
OINT
This parameter determines the set point used by the individual boilers in a Cascade when a system sensor is
connected to the Leader boiler. When a boiler is commanded to fire by the Leader boiler, it will attempt to achieve this
temperature at its outlet. The Leader boiler will limit the modulation of the boiler(s) in order to hold the temperature at
the system supply sensor to the user set point. If any of the boiler outlet temperatures reach the maximum cascade
set point, that boiler will then modulate down on its own in order to keep its outlet temperature within the maximum
cascade set point. Therefore, this parameter can be used to limit the outlet temperatures of all the boilers in a
Cascade. Note that this parameter does not apply when the boiler is heating an indirect DHW tank programmed as
normal. This parameter is adjustable by the installer by accessing the Maximum Cascade Set Point parameter. The
temperature range of this parameter is 0°C to 88°C. The default maximum cascade set point is 85°C.
21.9.4 C
ASCADE
O
FFSET
This parameter determines how much the temperature must go above set point before the lead boiler will turn off.
This parameter can be adjusted by the installer by accessing the Cascade Offset parameter. The temperature
range of this parameter is 0° to 11°C the default value is 6°C.