Lochinvar 81-286 Control modes, Ramp Settings, Controlling Sensor, BMS Thermostat Input

Service Manual

1 Service

Ramp Settings					Control modes
	Please note that the brackets ([]) denote				Controlling Sensor
NOTICE
	screen status.
					The SH controlling sensor parameter selects the sensor the
The SMART SYSTEM control can be programmed to limit					control will use to regulate the boiler firing rate. This parameter
					is adjustable by the installer by accessing the Controlling Sensor
the firing rate for a fixed period of time at the start of a
					parameter. The sensor selections are as follows:	The outlet
space heating demand. There are six (6) possible limits,
					sensor regulates the firing rate based on the outlet water
each with their own time delay. The first limit applies as
					temperature of the boiler and the inlet sensor regulates the
soon as the burner starts. Once its time delay expires, the
					firing rate based on the inlet water temperature of the boiler.
second limit is applied and its timer begins. The control
					If the outlet sensor is selected, and the optional system supply
steps through these limits until the 6th (sixth) limit expires.
					sensor is connected, the control will regulate the	firing rate
Note, however, that the 6th limit will also limit the rate for
					based on the system supply sensor temperature. The default
the rest of that heat demand. The installer can adjust the
					sensor is the Outlet Sensor.
firing limits and time delays by accessing the Ramp Settings
parameter. Once this parameter is selected, the screen will					BMS Thermostat Input
show the step number, the time delay for that step and the					When controlling the boiler through the 0 - 10V BMS input or
limit value corresponding with that step. If the installer
					through ModBus, the boiler can be enabled one of two ways.
wishes to adjust one of the values in that step, he can press
					With the BMS Thermostat Input parameter set to ACTIVE,
the NAVIGATION dial until the value he wishes to change
					the boiler will be enabled by closing the Heat/Loop Demand 1
is flashing. The installer can then rotate the NAVIGATION
					input. When set to INACTIVE, the boiler will be enabled by the
dial to adjust that value. If the installer			presses the RIGHT
					voltage level on the 0 - 10V input (in the case of 0 - 10V BMS
SELECT [SAVE] key while the		limit	value is	flashing,
					control), or the 0 - 10V input value received through ModBus.
the step value will flash again.		The	installer	can then
					The default value is INACTIVE.
select the next step and adjust the delay and limit values
corresponding with that step.					BMS
When finished, the installer can press the RIGHT SELECT					The set point or modulation of the boiler may be controlled
[SAVE] key to store the new settings, or the LEFT SELECT					through the 0 - 10V BMS input or through ModBus. When the
[EXIT] key to return to the Anti-Cyclingparameter list					BMS parameter is set to INACTIVE, the 0 - 10V input will be
without saving the changes. The delay value can be set					ignored. When set to ACTIVE, the set point or modulation will
between 0 minutes and 20 minutes. The limit value can be					be controlled by the voltage on the 0 - 10V input (in the case
set between 0% and 100%.					of 0 - 10V BMS control), or the 0 - 10V input value received
					through ModBus. The default value is INACTIVE.

Figure 1-2Ramp Delay Interval

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