Lochinvar 2072, 402 service manual Data logging, Functions

Copper-fin II/IIE Boiler and Water Heater Service Manual

1 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. The 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.

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

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. Different 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.

18