Maintenance, Caution – LAARS M4-Ext - Installation Manual User Manual
Page 22
Page 22
LAARS Heating Systems
MAINTENANCE
Button: MENU/
addition, you'll have access to view the Startup configuration settings.
CAUTION
To be able to change the M4 settings the Program/Run Switch must be set to
Program. The switch is located under the Enclosure Wiring Cover for security.
The Enclosure Wiring Cover can be securely closed using a lock.
BACK
SELECT
---------- MAINTENANCE ---------
System Trim
+0 F
Outdoor Trim
+0 F
Soft-Off Delay
45sec
RUN
PROGRAM
RUN
PROGRAM
SYSTEM & OUTDOOR SENSOR TRIM
Adjustable -5°F to +5°F Default:
0°F
Button: MENU/
Button: MENU/
The LAARS thermistor type sensors are very accurate, and normally require no
calibration. Sometimes it may be desirable to make small adjustments to the displayed
value for either the Outdoor temperature (OD) or the System temperature (SYS). The
Trim setting can adjust the displayed value by ± 5°F.
•
Do not use the Trim setting to make the Outdoor temperature sensor match that reported
on the radio or TV. Outdoor temperature can vary widely over a broadcast range. Only
trim the outdoor sensor based on an accurate thermometer reading taken where the
sensor is located.
BACK
SAVE
--- SYSTEM SENSOR TRIM ----
+0
F
[
]
BACK
SAVE
-- OUTDOOR SENSOR TRIM ----
+0
F
[
]
SOFT-OFF DELAY
Adjustable 0sec to 60sec Default:
45sec
Button: MENU/
When a stage is no longer needed, the Soft-Off keeps that stage burner in Low Fire prior
to turning it off.
•
The display will show a percent that is equal to the Ignition % for the stage in Soft-Off
delay. That number will blink for the Soft-Off delay period.
•
If during the Soft-Off stage delay period the M4 needed that stage to turn back on, the
stage will be released from the Soft-Off delay and resume normal operation.
BACK
SAVE
------- SOFT-OFF DELAY --------
45
sec
[
]
CAUTION
When using Soft-Off and Last Stage Hold, the last boiler stage will not turn off until both
parameters have elapsed. In this case, Soft-Off will start after the Last Stage Hold.
OUTPUT TRIM
Adjustable -5 to +5
Default: 0
Button: MENU/
Each of the stages controlled by the M4 has a separate Output Trim setting.
•
Output Trim acts as an adjustment to a stage output percent to match the burner motor.
•
After adjusting the Output Trim, test the operation to make sure the results match your
expectation.
BACK
SELECT
-------- STAGE A TRIM --------
Output Trim
+0.0
CAUTION
DO NOT use the Output Trim for a Stage unless it is absolutely necessary. Test burner operation and modulation
output matching after adjusting the Output Trim.