Lochinvar 402 - 2072, 502 - 2072 service manual Service, C Data logging, D Functions

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

1 Service

B3: SH Maximum set point

The SH maximum set point sets the maximum water temperature set point that can be used for space heating. The user or installer will not be able to program the control with a higher SH set point. This parameter can only be changed by the installer by accessing parameter B3. The temperature range of this parameter is 32°F (0°C) to 230°F (110°C) (space heating) or 32°F (0°C) to 105°F (40°C) (pool heater). The default value is 220°F (104°C) (space heating) or 105°F (55°C) (pool heater).

B4: SH Offset

The SH offset sets how many degrees above set point the temperature has to go before the unit will shut off. This parameter can only be changed by the installer by accessing parameter B4. The temperature range of this parameter is 0°F (0°C) to 54°F (30°C). The default value is 10°F (5°C) (boiler) or 2°F (1°C) (pool heater).

B5: SH Differential

The SH differential sets how many degrees below the turn off temperature the temperature has to go before the unit will turn on. This parameter can only be changed by the installer by accessing parameter B5. The temperature range of this parameter is 0°F (0°C) to 54°F (30°C). The default value is 20°F (11°C) (boiler) or 4°F (2°C) (pool heater).

B6: Manual reset high limit

The SMART SYSTEM control includes an integrated manual reset high limit (MRHL) feature, based on the outlet temperature. The set point for the MRHL is adjusted using parameter B6. The temperature range of this parameter is 32°F (0°C) to 210°F (99°C) for water heaters and pool heaters, or 240°F (115°C) for boilers. The default value is 210°F (99°C) for boilers and water heaters, or 200°F (93°C) for pool heaters.

B7: Auto reset high limit

The SMART SYSTEM control also includes an integrated auto reset high limit (ARHL) feature, based on outlet temperature. The ARHL set point is fixed at 205°F (96°C) for water heaters, and 185°F (85°C) for pool 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).

C:Data logging

C1: Hours running SH

The hours running SH parameter shows the total number of hours the unit has been in the SH firing mode. This parameter can be viewed by the user and the installer by accessing parameter C1.

C2: Hours running DHW

The hours running DHW parameter shows the total number of hours the unit has been in the DHW firing mode. This parameter can be viewed by the user and the installer by accessing parameter C2.

C3: Burner cycles

The burner cycles parameter shows the total number of times the unit has attempted to fire. This parameter can be viewed by the user and the installer by accessing parameter C3.

C4: Show last 10 lockouts

The control will log the 10 most current lockouts with the date and time the lockout occurred. This parameter can be viewed by the user and the installer by accessing parameter C4.

D: Functions

D1: Reset last 10 lockouts

The reset last 10 lockouts parameter allows the lockout counter to be reset to 0. This parameter can only be cleared by the installer by accessing parameter D1. Once accessed, press the RESET key to clear the counter.

D2: 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. This parameter can only be changed by the installer by accessing parameter D2. The time range of this parameter is 0 to 40 minutes. The default value is 20 minutes.

D3: 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 value of this timer can be adjusted using parameter D3. The range of this timer is 0 to 255 seconds. Setting this parameter to 0 disables the backlight. The default value is 60 seconds.

D4: 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. This time can be adjusted using parameter D4. The range of this parameter is 0 to 255 seconds. The default value is 20 seconds.

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