Data Logging - Lochinvar 402 Service Manual

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Service
SH Maximum setpoint (boiler only)
The SH maximum setpoint sets the maximum water temperature
setpoint that can be used for space heating. The user or installer
will not be able to program the control with a higher SH
setpoint. The temperature range of this parameter is 32°F (0°C)
to 230°F (110°C). The default value is 220°F (104°C).
SH Offset (boiler only)
The SH offset sets how many degrees above setpoint the
temperature has to go before the unit will shut off.
temperature range of this parameter is 0°F (0°C) to 54°F (30°C).
The default value is 10°F (5°C).
SH Differential (boiler only)
The SH differential sets how many degrees below the turn off
temperature the temperature has to go before the unit will turn
on. The temperature range of this parameter is 0°F (0°C) to
54°F (30°C). The default value is 20°F (11°C).
Manual reset high limit
The SMART SYSTEM control includes an integrated manual
reset high limit (MRHL) feature, based on the outlet temperature.
The temperature range of this parameter is 32°F (0°C) to 210°F
(99°C) for water heaters, or 240°F (115°C) for boilers. The
default value is 210°F (99°C) .
Auto reset high limit (boiler only)
The SMART SYSTEM control also includes an integrated auto
reset high limit (ARHL) feature, based on outlet temperature.
The ARHL setpoint is fixed at 205°F (96°C) for water heaters.
For boilers, the temperature range of this parameter is 32°F
(0°C) to 235°F (113°C). The default value is 200°F (93°C).

Data logging

Hours running SH (boiler only)
The hours running SH parameter shows the total number of
hours the unit has been in the SH firing mode.
Hours running DHW
The hours running DHW parameter shows the total number of
hours the unit has been in the DHW firing mode.
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Copper-fin II/IIE Boiler and Water Heater
Ignition attempts
The burner cycles parameter shows the total number of times
the unit has attempted to fire.
Last 10 lockouts
The control will log the 10 most current lockouts with the date
and time the lockout occurred.
Functions
The
Clear error log
The reset last 10 lockouts parameter allows the lockout counter
to be reset to 0. Once accessed, press the RESET key to clear
the counter.
Service mode delay
By pressing the PREVIOUS and NEXT keys on the front of
the display for five (5) seconds, the control will be placed
in Service Mode. This will override all other heat demands.
The Service Mode allows the installer to set the unit to either
maximum firing rate or minimum firing rate for the purpose of
combustion analysis. The delay sets the length of time the unit
will stay in the Service Mode if no keys have been pressed before
going back to its original state. The time range of this parameter
is 0 to 40 minutes. The default value is 20 minutes.
Display timeout
Whenever a button on the display is pushed, the backlight on
the LCD is turned on, and a delay timer is reset. When this
timer expires, the backlight turns off, and the display returns
to the first Status Screen. The range of this timer is 0 to 255
seconds. Setting this parameter to 0 disables the backlight. The
default value is 60 seconds.
Bypass valve time
In low temperature systems, a 3-way bypass valve can be installed
between the outlet and the inlet of the heater (see Installation
and Operation Manual). The SMART SYSTEM control can
be set to automatically control this valve to maintain the inlet
temperature above the condensing temperature.
valves require different amounts of time to open and close
completely. The SMART SYSTEM controls need to know how
long this takes in order to control the bypass valve properly.
The range of this parameter is 0 to 255 seconds. The default
value is 20 seconds.
Service Manual
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