lp-666 Rev. 003 Rel. 001 Date 2.25.20
58
K. Resetting the Maintenance Schedule
It is highly recommended to call for service when the Home Screen center pane turns yellow on the display. After service is performed, reset
the schedule for the next required service by using the following steps.
Press
Installer.
Tap next until prompted to enter a password. Enter “928”. Press SERVICE RESET button in the lower right corner of the Service
screen to reset the selected Service Schedule.
L. Service Mode - Setting and Verifying the Combustion Setting - Testing the Internal LWCO
NOTE:
Service Mode can be accessed from the Home Screen or by scrolling through the Installer Settings. Input Access Code
928
when
prompted to enter Service Mode.
Service Mode is intended to simplify fan testing, purging air from the water lines, testing the LWCO, and gas adjustment. The following figures
and tables include details on use as well as recommended combustion settings by fuel type and boiler fan speeds. Automatic modulation
does not take place while the controller is in Service Mode. However, the boilers will modulate down if the program set point is reached while
Pump Service Mode
Internal
LWCO Test
Service Mode
On/Off
Boiler
Pump
READY
DWH
Pump
4500
5000
1700
4500
Setpoint
MAX
MIN
Actual
Test
OFF
ON
ON
Reset
OFF
OFF
ON
ON
System
Pump
PWM
0%
PRESS SERVICE RESET
AFTER PERFORMING
REQUIRED SERVICE
PREVIOUS
Installer - Service Mode - LWCO Test
Press PREVIOUS to return to the previous screen
Tap to turn the Fan ON and OFF
Tap these Up and Down Arrows to set fan speed in 50 RPM increments
Tap Test to test
LWCO operation.
READY indicates
LWCO is ready
to test.
LWCO FAULT 21
indicates LWCO is
in fault.
Tap Reset
to Reset an
LWCO fault.
Tap to test Pump operation.
Service Reset
Press
Service Reset
to reset the
Service Schedule.
Current
fan speed
Tap these Up
and
Down Arrows
to go immediately
to
Maximum (Up)
and
Minimum (Down)
Fan Speeds
Figure 48 - Installer - Service Mode Screen
Adjustments to the throttle screw or offset may only be
made by a qualified gas technician using a calibrated
combustion analyzer capable of measuring CO2 and
CO. Failure to follow this instruction could result in fire,
explosion, property damage, severe personal injury, or
death.
WARNING
!
running in Service Mode. It is recommended to enter Service Mode with the
largest load possible to create such a heat demand that Service Mode will not
be interrupted. To enter Service Mode tap System in the display Navigation Bar;
then tap NEXT until you reach the Service Mode screens detailed in Figure 48.
NOTE:
The boiler will automatically exit Service Mode after 20 minutes of
operation.
Press the black up
^
and down v arrows to increase and decrease fan speed
fifty (50) RPM. Press the red up
^
arrow to go directly to max fan speed and
high fire. Press the blue down v arrow to go directly to min fan speed and low
fire.
Setting and Verifying the Combustion Setting
Enter Service Mode. At high fire, use a calibrated combustion analyzer to
test CO/CO2 measurements. Ensure the measurements meet those detailed
in Table 18. If unable to reach these measurements, remove the calibrated
combustion analyzer and bring it outdoors into fresh air. When the analyzer
reads zero, conduct the test again. If still unable to get the required readings
shown in the combustion chart, adjust the throttle screw on the gas valve in
¼ turn increments either in the positive (+) (counter-clockwise to increase fuel
or CO2) or negative (-) (clockwise to decrease CO2) direction. When the CO/
CO2 measurements meet those in Table 18 at high fire, conduct the test at low
fire. Record the combustion measurements in this manual for future reference.
Testing the UL 353 Approved Internal LWCO
In Service Mode, locate Internal LWCO Test in the upper right hand corner of
the screen. If the screen indicates that the Internal LWCO is READY to test, tap
Test. See Figure 48. If the Internal LWCO trips properly, the screen will read
LWCO FAULT F21. See Figure 48. Now tap Reset to reset the LWCO and clear
the fault.
To leave Service Mode, tap PREVIOUS to stay in the Installer menu or press
Home.
Table 18 - Combustion Settings - All Models
Combustion Settings on 1500 - 2000 Models
Fan Speed
Natural Gas (NG)
Low
High
Carbon Monoxide (CO) PPM
Less than 200
Carbon Dioxide (CO2) %
8 - 9
8 1/2 - 9 1/2
Combustion Settings on 400 - 1000 Models
Fan Speed
Natural Gas (NG)
Low
High
Carbon Monoxide (CO) PPM
Less than 200
Carbon Dioxide (CO2) %
9 - 10 1/2
8 1/2 - 9 1/2
Fan Speed
Propane (LP)
Low
High
Carbon Monoxide (CO) PPM
Less than 200
Carbon Dioxide (CO2) %
10 - 11
9 1/2 - 10 1/2